# 二进制高可用安装 K8s 集群
# 1. 基本配置
# 1.1 基本环境配置
| 主机名 | IP 地址 | 说明 |
|---|---|---|
| k8s-master01 ~ 03 | 192.168.1.71 ~ 73 | master 节点 * 3 |
| / | 192.168.1.70 | keepalived 虚拟 IP（不占用机器） |
| k8s-node01 ~ 02 | 192.168.1.74/75 | worker 节点 * 2 |
请统一替换这些网段，Pod 网段和 service 和宿主机网段不要重复！！！
| * 配置信息 * | 备注 |
|---|---|
| 系统版本 | Rocky Linux 8/9 |
| Containerd | latest |
| Pod 网段 | 172.16.0.0/16 |
| Service 网段 | 10.96.0.0/16 |
所有节点更改主机名（其它节点按需修改）：
hostnamectl set-hostname k8s-master01 |
所有节点配置 hosts，修改 /etc/hosts 如下：
[root@k8s-master01 ~]# cat /etc/hosts | |
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 | |
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 | |
192.168.1.71 k8s-master01 | |
192.168.1.72 k8s-master02 | |
192.168.1.73 k8s-master03 | |
192.168.1.74 k8s-node01 | |
192.168.1.75 k8s-node02 |
所有节点配置 yum 源：
# 配置基础源 | |
sed -e 's|^mirrorlist=|#mirrorlist=|g' \ | |
-e 's|^#baseurl=http://dl.rockylinux.org/$contentdir|baseurl=https://mirrors.aliyun.com/rockylinux|g' \ | |
-i.bak \ | |
/etc/yum.repos.d/*.repo | |
yum makecache |
所有节点必备工具安装：
yum install wget jq psmisc vim net-tools telnet yum-utils device-mapper-persistent-data lvm2 git rsyslog -y |
所有节点关闭防火墙、selinux、dnsmasq、swap、开启 rsyslog。服务器配置如下：
systemctl disable --now firewalld | |
systemctl disable --now dnsmasq | |
setenforce 0 | |
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/sysconfig/selinux | |
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config | |
systemctl enable --now rsyslog |
所有节点关闭 swap 分区：
swapoff -a && sysctl -w vm.swappiness=0 | |
sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab |
所有节点安装 ntpdate：
sudo dnf install epel-release -y | |
sudo dnf config-manager --set-enabled epel | |
sudo dnf install ntpsec |
所有节点同步时间并配置上海时区：
ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime | |
echo 'Asia/Shanghai' >/etc/timezone | |
ntpdate time2.aliyun.com | |
# 加入到 crontab | |
crontab -e | |
*/5 * * * * /usr/sbin/ntpdate time2.aliyun.com |
所有节点配置 limit：
ulimit -SHn 65535 | |
vim /etc/security/limits.conf | |
# 末尾添加如下内容 | |
* soft nofile 65536 | |
* hard nofile 131072 | |
* soft nproc 65535 | |
* hard nproc 655350 | |
* soft memlock unlimited | |
* hard memlock unlimited |
所有节点升级系统：
yum update -y
Master01 节点免密钥登录其他节点，安装过程中生成配置文件和证书均在 Master01 上操作，集群管理也在 Master01 上操作：
ssh-keygen -t rsa | |
for i in k8s-master01 k8s-master02 k8s-master03 k8s-node01 k8s-node02;do ssh-copy-id -i .ssh/id_rsa.pub $i;done |
注意：公有云环境，可能需要把 kubectl 放在一个非 Master 节点上
Master01 节点下载安装所有的源码文件：
cd /root/ ; git clone https://gitee.com/chinagei/k8s-ha-install |
# 1.2 内核配置
所有节点安装 ipvsadm：
yum install ipvsadm ipset sysstat conntrack libseccomp -y |
所有节点配置 ipvs 模块：
modprobe -- ip_vs | |
modprobe -- ip_vs_rr | |
modprobe -- ip_vs_wrr | |
modprobe -- ip_vs_sh | |
modprobe -- nf_conntrack |
所有节点创建 ipvs.conf，并配置开机自动加载：
vim /etc/modules-load.d/ipvs.conf | |
# 加入以下内容 | |
ip_vs | |
ip_vs_lc | |
ip_vs_wlc | |
ip_vs_rr | |
ip_vs_wrr | |
ip_vs_lblc | |
ip_vs_lblcr | |
ip_vs_dh | |
ip_vs_sh | |
ip_vs_fo | |
ip_vs_nq | |
ip_vs_sed | |
ip_vs_ftp | |
ip_vs_sh | |
nf_conntrack | |
ip_tables | |
ip_set | |
xt_set | |
ipt_set | |
ipt_rpfilter | |
ipt_REJECT | |
ipip |
所有节点然后执行 systemctl enable --now systemd-modules-load.service 即可（报错不用管）
systemctl enable --now systemd-modules-load.service |
所有节点内核优化配置：
cat <<EOF > /etc/sysctl.d/k8s.conf | |
net.ipv4.ip_forward = 1 | |
net.bridge.bridge-nf-call-iptables = 1 | |
net.bridge.bridge-nf-call-ip6tables = 1 | |
fs.may_detach_mounts = 1 | |
net.ipv4.conf.all.route_localnet = 1 | |
vm.overcommit_memory=1 | |
vm.panic_on_oom=0 | |
fs.inotify.max_user_watches=89100 | |
fs.file-max=52706963 | |
fs.nr_open=52706963 | |
net.netfilter.nf_conntrack_max=2310720 | |
net.ipv4.tcp_keepalive_time = 600 | |
net.ipv4.tcp_keepalive_probes = 3 | |
net.ipv4.tcp_keepalive_intvl =15 | |
net.ipv4.tcp_max_tw_buckets = 36000 | |
net.ipv4.tcp_tw_reuse = 1 | |
net.ipv4.tcp_max_orphans = 327680 | |
net.ipv4.tcp_orphan_retries = 3 | |
net.ipv4.tcp_syncookies = 1 | |
net.ipv4.tcp_max_syn_backlog = 16384 | |
net.ipv4.ip_conntrack_max = 65536 | |
net.ipv4.tcp_max_syn_backlog = 16384 | |
net.ipv4.tcp_timestamps = 0 | |
net.core.somaxconn = 16384 | |
EOF |
所有节点应用配置：
sysctl --system |
所有节点配置完内核后，重启机器，之后查看内核模块是否已自动加载：
reboot | |
lsmod | grep --color=auto -e ip_vs -e nf_conntrack |
# 2. 高可用组件安装
注意：如果安装的不是高可用集群，haproxy 和 keepalived 无需安装
注意：公有云要用公有云自带的负载均衡，比如阿里云的 SLB、NLB，腾讯云的 ELB，用来替代 haproxy 和 keepalived，因为公有云大部分都是不支持 keepalived 的。
所有 Master 节点通过 yum 安装 HAProxy 和 KeepAlived：
yum install keepalived haproxy -y |
所有 Master 节点配置 HAProxy，需要注意黄色部分的 IP：
[root@k8s-master01 etc]# mkdir /etc/haproxy | |
[root@k8s-master01 etc]# vim /etc/haproxy/haproxy.cfg | |
global | |
maxconn 2000 | |
ulimit-n 16384 | |
log 127.0.0.1 local0 err | |
stats timeout 30s | |
defaults | |
log global | |
mode http | |
option httplog | |
timeout connect 5000 | |
timeout client 50000 | |
timeout server 50000 | |
timeout http-request 15s | |
timeout http-keep-alive 15s | |
frontend monitor-in | |
bind *:33305 | |
mode http | |
option httplog | |
monitor-uri /monitor | |
frontend k8s-master | |
bind 0.0.0.0:8443 #HAProxy 监听端口 | |
bind 127.0.0.1:8443 #HAProxy 监听端口 | |
mode tcp | |
option tcplog | |
tcp-request inspect-delay 5s | |
default_backend k8s-master | |
backend k8s-master | |
mode tcp | |
option tcplog | |
option tcp-check | |
balance roundrobin | |
default-server inter 10s downinter 5s rise 2 fall 2 slowstart 60s maxconn 250 maxqueue 256 weight 100 | |
server k8s-master01 192.168.1.71:6443 check #API Server IP 地址 | |
server k8s-master02 192.168.1.72:6443 check #API Server IP 地址 | |
server k8s-master03 192.168.1.73:6443 check #API Server IP 地址 |
所有 Master 节点配置 KeepAlived，需要注意黄色部分的配置。
Master01 节点的配置：
[root@k8s-master01 etc]# mkdir /etc/keepalived | |
[root@k8s-master01 ~]# vim /etc/keepalived/keepalived.conf | |
! Configuration File for keepalived | |
global_defs { | |
router_id LVS_DEVEL | |
script_user root | |
enable_script_security | |
} | |
vrrp_script chk_apiserver { | |
script "/etc/keepalived/check_apiserver.sh" | |
interval 5 | |
weight -5 | |
fall 2 | |
rise 1 | |
} | |
vrrp_instance VI_1 { | |
state MASTER | |
interface ens160 #网卡名称 | |
mcast_src_ip 192.168.1.71 #K8s-master01 IP 地址 | |
virtual_router_id 51 | |
priority 101 | |
advert_int 2 | |
authentication { | |
auth_type PASS | |
auth_pass K8SHA_KA_AUTH | |
} | |
virtual_ipaddress { | |
192.168.1.70 #VIP 地址 | |
} | |
track_script { | |
chk_apiserver | |
} | |
} |
Master02 节点的配置：
# vim /etc/keepalived/keepalived.conf | |
! Configuration File for keepalived | |
global_defs { | |
router_id LVS_DEVEL | |
script_user root | |
enable_script_security | |
} | |
vrrp_script chk_apiserver { | |
script "/etc/keepalived/check_apiserver.sh" | |
interval 5 | |
weight -5 | |
fall 2 | |
rise 1 | |
} | |
vrrp_instance VI_1 { | |
state BACKUP | |
interface ens160 #网卡名称 | |
mcast_src_ip 192.168.1.72 #K8s-master02 IP 地址 | |
virtual_router_id 51 | |
priority 100 | |
advert_int 2 | |
authentication { | |
auth_type PASS | |
auth_pass K8SHA_KA_AUTH | |
} | |
virtual_ipaddress { | |
192.168.1.70 #VIP 地址 | |
} | |
track_script { | |
chk_apiserver | |
} | |
} |
Master03 节点的配置：
# vim /etc/keepalived/keepalived.conf | |
! Configuration File for keepalived | |
global_defs { | |
router_id LVS_DEVEL | |
script_user root | |
enable_script_security | |
} | |
vrrp_script chk_apiserver { | |
script "/etc/keepalived/check_apiserver.sh" | |
interval 5 | |
weight -5 | |
fall 2 | |
rise 1 | |
} | |
vrrp_instance VI_1 { | |
state BACKUP | |
interface ens160 #网卡名称 | |
mcast_src_ip 192.168.1.73 #K8s-master03 IP 地址 | |
virtual_router_id 51 | |
priority 100 | |
advert_int 2 | |
authentication { | |
auth_type PASS | |
auth_pass K8SHA_KA_AUTH | |
} | |
virtual_ipaddress { | |
192.168.1.70 #VIP 地址 | |
} | |
track_script { | |
chk_apiserver | |
} | |
} |
所有 master 节点配置 KeepAlived 健康检查文件：
[root@k8s-master01 keepalived]# vim /etc/keepalived/check_apiserver.sh | |
#!/bin/bash | |
err=0 | |
for k in $(seq 1 3) | |
do | |
check_code=$(pgrep haproxy) | |
if [[ $check_code == "" ]]; then | |
err=$(expr $err + 1) | |
sleep 1 | |
continue | |
else | |
err=0 | |
break | |
fi | |
done | |
if [[ $err != "0" ]]; then | |
echo "systemctl stop keepalived" | |
/usr/bin/systemctl stop keepalived | |
exit 1 | |
else | |
exit 0 | |
fi |
所有 master 节点配置健康检查文件添加执行权限：
chmod +x /etc/keepalived/check_apiserver.sh |
所有 master 节点启动 haproxy 和 keepalived：
[root@k8s-master01 keepalived]# systemctl daemon-reload | |
[root@k8s-master01 keepalived]# systemctl enable --now haproxy | |
[root@k8s-master01 keepalived]# systemctl enable --now keepalived |
重要：如果安装了 keepalived 和 haproxy，需要测试 keepalived 是否是正常的
所有节点测试VIP | |
[root@k8s-master01 ~]# ping 192.168.1.70 -c 4 | |
PING 192.168.1.70 (192.168.1.70) 56(84) bytes of data. | |
64 bytes from 192.168.1.70: icmp_seq=1 ttl=64 time=0.464 ms | |
64 bytes from 192.168.1.70: icmp_seq=2 ttl=64 time=0.063 ms | |
64 bytes from 192.168.1.70: icmp_seq=3 ttl=64 time=0.062 ms | |
64 bytes from 192.168.1.70: icmp_seq=4 ttl=64 time=0.063 ms | |
[root@k8s-master01 ~]# telnet 192.168.1.70 16443 | |
Trying 192.168.1.70... | |
Connected to 192.168.1.70. | |
Escape character is '^]'. | |
Connection closed by foreign host. |
如果 ping 不通且 telnet 没有出现 ] ，则认为 VIP 不可以，不可在继续往下执行，需要排查 keepalived 的问题，比如防火墙和 selinux，haproxy 和 keepalived 的状态，监听端口等
- 所有节点查看防火墙状态必须为 disable 和 inactive：systemctl status firewalld
- 所有节点查看 selinux 状态，必须为 disable：getenforce
- master 节点查看 haproxy 和 keepalived 状态：systemctl status keepalived haproxy
- master 节点查看监听端口：netstat -lntp
如果以上都没有问题，需要确认：
是否是公有云机器
是否是私有云机器（类似 OpenStack）
上述公有云一般都是不支持 keepalived，私有云可能也有限制，需要和自己的私有云管理员咨询
# 3. Runtime 安装
如果安装的版本低于 1.24，选择 Docker 和 Containerd 均可，高于 1.24 建议选择 Containerd 作为 Runtime，不再推荐使用 Docker 作为 Runtime。
# 3.1 安装 Containerd
所有节点配置安装源：
yum install wget jq psmisc vim net-tools telnet yum-utils device-mapper-persistent-data lvm2 git -y | |
yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo |
所有节点安装 docker-ce（如果在以前已经安装过，需要重新安装更新一下）：
# yum install docker-ce containerd -y |
可以无需启动 Docker，只需要配置和启动 Containerd 即可。
首先配置 Containerd 所需的模块（所有节点）：
# cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf | |
overlay | |
br_netfilter | |
EOF |
所有节点加载模块：
# modprobe -- overlay | |
# modprobe -- br_netfilter |
所有节点，配置 Containerd 所需的内核：
# cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf | |
net.bridge.bridge-nf-call-iptables = 1 | |
net.ipv4.ip_forward = 1 | |
net.bridge.bridge-nf-call-ip6tables = 1 | |
EOF |
所有节点加载内核：
# sysctl --system |
所有节点生成 Containerd 的配置文件：
# mkdir -p /etc/containerd | |
# containerd config default | tee /etc/containerd/config.toml |
所有节点更改 Containerd 的 Cgroup 和 Pause 镜像配置：
sed -i 's#SystemdCgroup = false#SystemdCgroup = true#g' /etc/containerd/config.toml | |
sed -i 's#k8s.gcr.io/pause#registry.cn-hangzhou.aliyuncs.com/google_containers/pause#g' /etc/containerd/config.toml | |
sed -i 's#registry.gcr.io/pause#registry.cn-hangzhou.aliyuncs.com/google_containers/pause#g' /etc/containerd/config.toml | |
sed -i 's#registry.k8s.io/pause#registry.cn-hangzhou.aliyuncs.com/google_containers/pause#g' /etc/containerd/config.toml |
所有节点启动 Containerd，并配置开机自启动：
# systemctl daemon-reload | |
# systemctl enable --now containerd |
所有节点配置 crictl 客户端连接的运行时位置（可选）：
# cat > /etc/crictl.yaml <<EOF | |
runtime-endpoint: unix:///run/containerd/containerd.sock | |
image-endpoint: unix:///run/containerd/containerd.sock | |
timeout: 10 | |
debug: false | |
EOF |
# 4 . K8S 及 etcd 安装
Master01 下载 kubernetes 安装包（1.32.3 需要更改为你看到的最新版本）：
[root@k8s-master01 ~]# wget https://dl.k8s.io/v1.32.0/kubernetes-server-linux-amd64.tar.gz |
最新版获取地址：https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/
以下操作都在 master01 执行
下载 etcd 安装包：https://github.com/etcd-io/etcd/releases/
[root@k8s-master01 ~]# wget https://github.com/etcd-io/etcd/releases/download/v3.5.16/etcd-v3.5.16-linux-amd64.tar.gz |
解压 kubernetes 安装文件：
[root@k8s-master01 ~]# tar -xf kubernetes-server-linux-amd64.tar.gz --strip-components=3 -C /usr/local/bin kubernetes/server/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy} |
解压 etcd 安装文件：
[root@k8s-master01 ~]# tar -zxvf etcd-v3.5.16-linux-amd64.tar.gz --strip-components=1 -C /usr/local/bin etcd-v3.5.16-linux-amd64/etcd{,ctl} |
版本查看：
[root@k8s-master01 ~]# kubelet --version | |
Kubernetes v1.32.3 | |
[root@k8s-master01 ~]# etcdctl version | |
etcdctl version: 3.5.16 | |
API version: 3.5 |
将组件发送到其他节点
MasterNodes='k8s-master02 k8s-master03' | |
WorkNodes='k8s-node01 k8s-node02' | |
for NODE in $MasterNodes; do echo $NODE; scp /usr/local/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy} $NODE:/usr/local/bin/; scp /usr/local/bin/etcd* $NODE:/usr/local/bin/; done | |
for NODE in $WorkNodes; do scp /usr/local/bin/kube{let,-proxy} $NODE:/usr/local/bin/ ; done |
Master01 节点切换到 1.32.x 分支（其他版本可以切换到其他分支，.x 即可，不需要更改为具体的小版本）：
cd /root/k8s-ha-install && git checkout manual-installation-v1.32.x |
# 5 . 生成证书
二进制安装最关键步骤，一步错误全盘皆输，一定要注意每个步骤都要是正确的
Master01 下载生成证书工具（下载不成功可以去百度网盘）
wget "https://pkg.cfssl.org/R1.2/cfssl_linux-amd64" -O /usr/local/bin/cfssl | |
wget "https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64" -O /usr/local/bin/cfssljson | |
chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson |
# 5.1 Etcd 证书
所有 Master 节点创建 etcd 证书目录：
mkdir /etc/etcd/ssl -p |
所有节点创建 kubernetes 相关目录：
mkdir -p /etc/kubernetes/pki |
Master01 节点生成 etcd 证书
生成证书的 CSR（证书签名请求文件，配置了一些域名、公司、单位）文件：
[root@k8s-master01 pki]# cd /root/k8s-ha-install/pki | |
# 生成 etcd CA 证书和 CA 证书的 key | |
cfssl gencert -initca etcd-ca-csr.json | cfssljson -bare /etc/etcd/ssl/etcd-ca | |
cfssl gencert \ | |
-ca=/etc/etcd/ssl/etcd-ca.pem \ | |
-ca-key=/etc/etcd/ssl/etcd-ca-key.pem \ | |
-config=ca-config.json \ | |
-hostname=127.0.0.1,k8s-master01,k8s-master02,k8s-master03,192.168.1.71,192.168.1.72,192.168.1.73 \ | |
-profile=kubernetes \ | |
etcd-csr.json | cfssljson -bare /etc/etcd/ssl/etcd | |
执行结果 | |
[INFO] generate received request | |
[INFO] received CSR | |
[INFO] generating key: rsa-2048 | |
[INFO] encoded CSR | |
[INFO] signed certificate with serial number 250230878926052708909595617022917808304837732033 |
将证书复制到其他 master 节点
MasterNodes='k8s-master02 k8s-master03' | |
for NODE in $MasterNodes; do | |
ssh $NODE "mkdir -p /etc/etcd/ssl" | |
for FILE in etcd-ca-key.pem etcd-ca.pem etcd-key.pem etcd.pem; do | |
scp /etc/etcd/ssl/${FILE} $NODE:/etc/etcd/ssl/${FILE} | |
done | |
done |
# 5.2 K8s 组件证书
Master01 生成 kubernetes CA 证书：
[root@k8s-master01 pki]# cd /root/k8s-ha-install/pki | |
cfssl gencert -initca ca-csr.json | cfssljson -bare /etc/kubernetes/pki/ca |
# 5.2.1 APIServer 证书
注意：10.96.0. 是 k8s service 的网段，如果说需要更改 k8s service 网段，那就需要更改 10.96.0.1
cfssl gencert -ca=/etc/kubernetes/pki/ca.pem -ca-key=/etc/kubernetes/pki/ca-key.pem -config=ca-config.json -hostname=10.96.0.1,192.168.1.70,127.0.0.1,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local,192.168.1.71,192.168.1.72,192.168.1.73 -profile=kubernetes apiserver-csr.json | cfssljson -bare /etc/kubernetes/pki/apiserver |
生成 apiserver 的聚合证书：：
cfssl gencert -initca front-proxy-ca-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-ca | |
cfssl gencert -ca=/etc/kubernetes/pki/front-proxy-ca.pem -ca-key=/etc/kubernetes/pki/front-proxy-ca-key.pem -config=ca-config.json -profile=kubernetes front-proxy-client-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-client |
返回结果（忽略警告）：
2020/12/11 18:15:28 [INFO] generate received request | |
2020/12/11 18:15:28 [INFO] received CSR | |
2020/12/11 18:15:28 [INFO] generating key: rsa-2048 | |
2020/12/11 18:15:28 [INFO] encoded CSR | |
2020/12/11 18:15:28 [INFO] signed certificate with serial number 597484897564859295955894546063479154194995827845 | |
2020/12/11 18:15:28 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for | |
websites. For more information see the Baseline Requirements for the Issuance and Management | |
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org); | |
specifically, section 10.2.3 ("Information Requirements"). |
# 5.2.2 ControllerManager
生成 controller-manage 的证书：
cfssl gencert \ | |
-ca=/etc/kubernetes/pki/ca.pem \ | |
-ca-key=/etc/kubernetes/pki/ca-key.pem \ | |
-config=ca-config.json \ | |
-profile=kubernetes \ | |
manager-csr.json | cfssljson -bare /etc/kubernetes/pki/controller-manager | |
注意：修改黄色部分的IP地址 | |
# set-cluster：设置一个集群项， | |
kubectl config set-cluster kubernetes \ | |
--certificate-authority=/etc/kubernetes/pki/ca.pem \ | |
--embed-certs=true \ | |
--server=https://192.168.1.70:8443 \ | |
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig | |
# 设置一个环境项，一个上下文 | |
kubectl config set-context system:kube-controller-manager@kubernetes \ | |
--cluster=kubernetes \ | |
--user=system:kube-controller-manager \ | |
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig | |
# set-credentials 设置一个用户项 | |
kubectl config set-credentials system:kube-controller-manager \ | |
--client-certificate=/etc/kubernetes/pki/controller-manager.pem \ | |
--client-key=/etc/kubernetes/pki/controller-manager-key.pem \ | |
--embed-certs=true \ | |
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig | |
# 使用某个环境当做默认环境 | |
kubectl config use-context system:kube-controller-manager@kubernetes \ | |
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig |
# 5.2.3 Scheduler 证书
cfssl gencert \ | |
-ca=/etc/kubernetes/pki/ca.pem \ | |
-ca-key=/etc/kubernetes/pki/ca-key.pem \ | |
-config=ca-config.json \ | |
-profile=kubernetes \ | |
scheduler-csr.json | cfssljson -bare /etc/kubernetes/pki/scheduler | |
注意：修改黄色部分的IP地址 | |
kubectl config set-cluster kubernetes \ | |
--certificate-authority=/etc/kubernetes/pki/ca.pem \ | |
--embed-certs=true \ | |
--server=https://192.168.1.70:8443 \ | |
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig | |
kubectl config set-credentials system:kube-scheduler \ | |
--client-certificate=/etc/kubernetes/pki/scheduler.pem \ | |
--client-key=/etc/kubernetes/pki/scheduler-key.pem \ | |
--embed-certs=true \ | |
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig | |
kubectl config set-context system:kube-scheduler@kubernetes \ | |
--cluster=kubernetes \ | |
--user=system:kube-scheduler \ | |
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig | |
kubectl config use-context system:kube-scheduler@kubernetes \ | |
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig |
# 5.2.4 生成管理员证书
Kubectl /etc/Kubernetes/admin.conf ~/.kube/config
cfssl gencert \ | |
-ca=/etc/kubernetes/pki/ca.pem \ | |
-ca-key=/etc/kubernetes/pki/ca-key.pem \ | |
-config=ca-config.json \ | |
-profile=kubernetes \ | |
admin-csr.json | cfssljson -bare /etc/kubernetes/pki/admin | |
注意：修改黄色部分的IP | |
kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://192.168.1.70:8443 --kubeconfig=/etc/kubernetes/admin.kubeconfig | |
kubectl config set-credentials kubernetes-admin --client-certificate=/etc/kubernetes/pki/admin.pem --client-key=/etc/kubernetes/pki/admin-key.pem --embed-certs=true --kubeconfig=/etc/kubernetes/admin.kubeconfig | |
kubectl config set-context kubernetes-admin@kubernetes --cluster=kubernetes --user=kubernetes-admin --kubeconfig=/etc/kubernetes/admin.kubeconfig | |
kubectl config use-context kubernetes-admin@kubernetes --kubeconfig=/etc/kubernetes/admin.kubeconfig |
# 5.2.5 创建 ServiceAccount 证书
创建一对公钥，用来签发 ServiceAccount 的 Token：
openssl genrsa -out /etc/kubernetes/pki/sa.key 2048 |
返回结果：
Generating RSA private key, 2048 bit long modulus (2 primes) | |
...................................................................................+++++ | |
...............+++++ | |
e is 65537 (0x010001) |
openssl rsa -in /etc/kubernetes/pki/sa.key -pubout -out /etc/kubernetes/pki/sa.pub |
发送证书至其他节点：
for NODE in k8s-master02 k8s-master03; do | |
for FILE in $(ls /etc/kubernetes/pki | grep -v etcd); do | |
scp /etc/kubernetes/pki/${FILE} $NODE:/etc/kubernetes/pki/${FILE}; | |
done; | |
for FILE in admin.kubeconfig controller-manager.kubeconfig scheduler.kubeconfig; do | |
scp /etc/kubernetes/${FILE} $NODE:/etc/kubernetes/${FILE}; | |
done; | |
done |
查看证书文件：
[root@k8s-master01 pki]# ls /etc/kubernetes/pki/ | |
admin.csr apiserver.csr ca.csr controller-manager.csr front-proxy-ca.csr front-proxy-client.csr sa.key scheduler-key.pem | |
admin-key.pem apiserver-key.pem ca-key.pem controller-manager-key.pem front-proxy-ca-key.pem front-proxy-client-key.pem sa.pub scheduler.pem | |
admin.pem apiserver.pem ca.pem controller-manager.pem front-proxy-ca.pem front-proxy-client.pem scheduler.csr | |
[root@k8s-master01 pki]# ls /etc/kubernetes/pki/ |wc -l | |
23 |
# 6. Kubernetes 组件配置
# 6.1 Ecd 配置
Etcd 配置大致相同，注意修改每个 Master 节点的 etcd 配置的主机名和 IP 地址
# 6.1.1 Master01
# vim /etc/etcd/etcd.config.yml | |
name: 'k8s-master01' # k8s-master01 名称 | |
data-dir: /var/lib/etcd | |
wal-dir: /var/lib/etcd/wal | |
snapshot-count: 5000 | |
heartbeat-interval: 100 | |
election-timeout: 1000 | |
quota-backend-bytes: 0 | |
listen-peer-urls: 'https://192.168.1.71:2380' # k8s-master01 IP | |
listen-client-urls: 'https://192.168.1.71:2379,http://127.0.0.1:2379' # k8s-master01 IP | |
max-snapshots: 3 | |
max-wals: 5 | |
cors: | |
initial-advertise-peer-urls: 'https://192.168.1.71:2380' # k8s-master01 IP | |
advertise-client-urls: 'https://192.168.1.71:2379' # k8s-master01 IP | |
discovery: | |
discovery-fallback: 'proxy' | |
discovery-proxy: | |
discovery-srv: | |
initial-cluster: 'k8s-master01=https://192.168.1.71:2380,k8s-master02=https://192.168.1.72:2380,k8s-master03=https://192.168.1.73:2380' # k8s-master01、k8s-master02、k8s-master03 IP | |
initial-cluster-token: 'etcd-k8s-cluster' | |
initial-cluster-state: 'new' | |
strict-reconfig-check: false | |
enable-v2: true | |
enable-pprof: true | |
proxy: 'off' | |
proxy-failure-wait: 5000 | |
proxy-refresh-interval: 30000 | |
proxy-dial-timeout: 1000 | |
proxy-write-timeout: 5000 | |
proxy-read-timeout: 0 | |
client-transport-security: | |
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem' | |
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem' | |
client-cert-auth: true | |
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem' | |
auto-tls: true | |
peer-transport-security: | |
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem' | |
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem' | |
peer-client-cert-auth: true | |
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem' | |
auto-tls: true | |
debug: false | |
log-package-levels: | |
log-outputs: [default] | |
force-new-cluster: false |
# 6.1.2 Master02
# vim /etc/etcd/etcd.config.yml | |
name: 'k8s-master02' # k8s-master02 名称 | |
data-dir: /var/lib/etcd | |
wal-dir: /var/lib/etcd/wal | |
snapshot-count: 5000 | |
heartbeat-interval: 100 | |
election-timeout: 1000 | |
quota-backend-bytes: 0 | |
listen-peer-urls: 'https://192.168.1.72:2380' # k8s-master02 IP | |
listen-client-urls: 'https://192.168.1.72:2379,http://127.0.0.1:2379' # k8s-master02 IP | |
max-snapshots: 3 | |
max-wals: 5 | |
cors: | |
initial-advertise-peer-urls: 'https://192.168.1.72:2380' # k8s-master02 IP | |
advertise-client-urls: 'https://192.168.1.72:2379' # k8s-master02 IP | |
discovery: | |
discovery-fallback: 'proxy' | |
discovery-proxy: | |
discovery-srv: | |
initial-cluster: 'k8s-master01=https://192.168.1.71:2380,k8s-master02=https://192.168.1.72:2380,k8s-master03=https://192.168.1.73:2380' # k8s-master01、k8s-master02、k8s-master03 IP | |
initial-cluster-token: 'etcd-k8s-cluster' | |
initial-cluster-state: 'new' | |
strict-reconfig-check: false | |
enable-v2: true | |
enable-pprof: true | |
proxy: 'off' | |
proxy-failure-wait: 5000 | |
proxy-refresh-interval: 30000 | |
proxy-dial-timeout: 1000 | |
proxy-write-timeout: 5000 | |
proxy-read-timeout: 0 | |
client-transport-security: | |
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem' | |
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem' | |
client-cert-auth: true | |
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem' | |
auto-tls: true | |
peer-transport-security: | |
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem' | |
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem' | |
peer-client-cert-auth: true | |
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem' | |
auto-tls: true | |
debug: false | |
log-package-levels: | |
log-outputs: [default] | |
force-new-cluster: false |
# 6.1.3 Master03
# vim /etc/etcd/etcd.config.yml | |
name: 'k8s-master03' # k8s-master03 名称 | |
data-dir: /var/lib/etcd | |
wal-dir: /var/lib/etcd/wal | |
snapshot-count: 5000 | |
heartbeat-interval: 100 | |
election-timeout: 1000 | |
quota-backend-bytes: 0 | |
listen-peer-urls: 'https://192.168.1.73:2380' # k8s-master03 IP | |
listen-client-urls: 'https://192.168.1.73:2379,http://127.0.0.1:2379' # k8s-master03 IP | |
max-snapshots: 3 | |
max-wals: 5 | |
cors: | |
initial-advertise-peer-urls: 'https://192.168.1.73:2380' # k8s-master03 IP | |
advertise-client-urls: 'https://192.168.1.73:2379' # k8s-master03 IP | |
discovery: | |
discovery-fallback: 'proxy' | |
discovery-proxy: | |
discovery-srv: | |
initial-cluster: 'k8s-master01=https://192.168.1.71:2380,k8s-master02=https://192.168.1.72:2380,k8s-master03=https://192.168.1.73:2380' # k8s-master01、k8s-master02、k8s-master03 IP | |
initial-cluster-token: 'etcd-k8s-cluster' | |
initial-cluster-state: 'new' | |
strict-reconfig-check: false | |
enable-v2: true | |
enable-pprof: true | |
proxy: 'off' | |
proxy-failure-wait: 5000 | |
proxy-refresh-interval: 30000 | |
proxy-dial-timeout: 1000 | |
proxy-write-timeout: 5000 | |
proxy-read-timeout: 0 | |
client-transport-security: | |
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem' | |
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem' | |
client-cert-auth: true | |
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem' | |
auto-tls: true | |
peer-transport-security: | |
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem' | |
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem' | |
peer-client-cert-auth: true | |
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem' | |
auto-tls: true | |
debug: false | |
log-package-levels: | |
log-outputs: [default] | |
force-new-cluster: false |
# 6.1.4 启动 Etcd
所有 Master 节点创建 etcd service 并启动
# vim /usr/lib/systemd/system/etcd.service | |
[Unit] | |
Description=Etcd Service | |
Documentation=https://coreos.com/etcd/docs/latest/ | |
After=network.target | |
[Service] | |
Type=notify | |
ExecStart=/usr/local/bin/etcd --config-file=/etc/etcd/etcd.config.yml | |
Restart=on-failure | |
RestartSec=10 | |
LimitNOFILE=65536 | |
[Install] | |
WantedBy=multi-user.target | |
Alias=etcd3.service |
所有 Master 节点创建 etcd 的证书目录：
mkdir /etc/kubernetes/pki/etcd | |
ln -s /etc/etcd/ssl/* /etc/kubernetes/pki/etcd/ | |
systemctl daemon-reload | |
systemctl enable --now etcd |
查看 etcd 状态：
export ETCDCTL_API=3 | |
etcdctl --endpoints="192.168.1.73:2379,192.168.1.72:2379,192.168.1.71:2379" --cacert=/etc/kubernetes/pki/etcd/etcd-ca.pem --cert=/etc/kubernetes/pki/etcd/etcd.pem --key=/etc/kubernetes/pki/etcd/etcd-key.pem endpoint status --write-out=table |
# 6.2 APIServer 配置
# 6.2.1 Master01
注意：本文档使用的 k8s service 网段为 10.96.0.0/16，该网段不能和宿主机的网段、Pod 网段的重复，请按需修改：
[root@k8s-master01 pki]# vim /usr/lib/systemd/system/kube-apiserver.service | |
[Unit] | |
Description=Kubernetes API Server | |
Documentation=https://github.com/kubernetes/kubernetes | |
After=network.target | |
[Service] | |
ExecStart=/usr/local/bin/kube-apiserver \ | |
--v=2 \ | |
--allow-privileged=true \ | |
--bind-address=0.0.0.0 \ | |
--secure-port=6443 \ | |
--advertise-address=192.168.1.71 \ | |
--service-cluster-ip-range=10.96.0.0/16 \ | |
--service-node-port-range=30000-32767 \ | |
--etcd-servers=https://192.168.1.71:2379,https://192.168.1.72:2379,https://192.168.1.73:2379 \ | |
--etcd-cafile=/etc/etcd/ssl/etcd-ca.pem \ | |
--etcd-certfile=/etc/etcd/ssl/etcd.pem \ | |
--etcd-keyfile=/etc/etcd/ssl/etcd-key.pem \ | |
--client-ca-file=/etc/kubernetes/pki/ca.pem \ | |
--tls-cert-file=/etc/kubernetes/pki/apiserver.pem \ | |
--tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem \ | |
--kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem \ | |
--kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem \ | |
--service-account-key-file=/etc/kubernetes/pki/sa.pub \ | |
--service-account-signing-key-file=/etc/kubernetes/pki/sa.key \ | |
--service-account-issuer=https://kubernetes.default.svc.cluster.local \ | |
--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \ | |
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota \ | |
--authorization-mode=Node,RBAC \ | |
--enable-bootstrap-token-auth=true \ | |
--requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \ | |
--proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem \ | |
--proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem \ | |
--requestheader-allowed-names=aggregator \ | |
--requestheader-group-headers=X-Remote-Group \ | |
--requestheader-extra-headers-prefix=X-Remote-Extra- \ | |
--requestheader-username-headers=X-Remote-User | |
# --token-auth-file=/etc/kubernetes/token.csv | |
Restart=on-failure | |
RestartSec=10s | |
LimitNOFILE=65535 | |
[Install] | |
WantedBy=multi-user.target |
# 6.2.2 Master02
注意：本文档使用的 k8s service 网段为 10.96.0.0/16，该网段不能和宿主机的网段、Pod 网段的重复，请按需修改：
[root@k8s-master01 pki]# vim /usr/lib/systemd/system/kube-apiserver.service | |
[Unit] | |
Description=Kubernetes API Server | |
Documentation=https://github.com/kubernetes/kubernetes | |
After=network.target | |
[Service] | |
ExecStart=/usr/local/bin/kube-apiserver \ | |
--v=2 \ | |
--allow-privileged=true \ | |
--bind-address=0.0.0.0 \ | |
--secure-port=6443 \ | |
--advertise-address=192.168.1.72 \ | |
--service-cluster-ip-range=10.96.0.0/16 \ | |
--service-node-port-range=30000-32767 \ | |
--etcd-servers=https://192.168.1.71:2379,https://192.168.1.72:2379,https://192.168.1.73:2379 \ | |
--etcd-cafile=/etc/etcd/ssl/etcd-ca.pem \ | |
--etcd-certfile=/etc/etcd/ssl/etcd.pem \ | |
--etcd-keyfile=/etc/etcd/ssl/etcd-key.pem \ | |
--client-ca-file=/etc/kubernetes/pki/ca.pem \ | |
--tls-cert-file=/etc/kubernetes/pki/apiserver.pem \ | |
--tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem \ | |
--kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem \ | |
--kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem \ | |
--service-account-key-file=/etc/kubernetes/pki/sa.pub \ | |
--service-account-signing-key-file=/etc/kubernetes/pki/sa.key \ | |
--service-account-issuer=https://kubernetes.default.svc.cluster.local \ | |
--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \ | |
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota \ | |
--authorization-mode=Node,RBAC \ | |
--enable-bootstrap-token-auth=true \ | |
--requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \ | |
--proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem \ | |
--proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem \ | |
--requestheader-allowed-names=aggregator \ | |
--requestheader-group-headers=X-Remote-Group \ | |
--requestheader-extra-headers-prefix=X-Remote-Extra- \ | |
--requestheader-username-headers=X-Remote-User | |
Restart=on-failure | |
RestartSec=10s | |
LimitNOFILE=65535 | |
[Install] | |
WantedBy=multi-user.target |
# 6.2.3 Master03
注意：本文档使用的 k8s service 网段为 10.96.0.0/16，该网段不能和宿主机的网段、Pod 网段的重复，请按需修改：
[root@k8s-master01 pki]# vim /usr/lib/systemd/system/kube-apiserver.service | |
[Unit] | |
Description=Kubernetes API Server | |
Documentation=https://github.com/kubernetes/kubernetes | |
After=network.target | |
[Service] | |
ExecStart=/usr/local/bin/kube-apiserver \ | |
--v=2 \ | |
--allow-privileged=true \ | |
--bind-address=0.0.0.0 \ | |
--secure-port=6443 \ | |
--advertise-address=192.168.1.73 \ | |
--service-cluster-ip-range=10.96.0.0/16 \ | |
--service-node-port-range=30000-32767 \ | |
--etcd-servers=https://192.168.1.71:2379,https://192.168.1.72:2379,https://192.168.1.73:2379 \ | |
--etcd-cafile=/etc/etcd/ssl/etcd-ca.pem \ | |
--etcd-certfile=/etc/etcd/ssl/etcd.pem \ | |
--etcd-keyfile=/etc/etcd/ssl/etcd-key.pem \ | |
--client-ca-file=/etc/kubernetes/pki/ca.pem \ | |
--tls-cert-file=/etc/kubernetes/pki/apiserver.pem \ | |
--tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem \ | |
--kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem \ | |
--kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem \ | |
--service-account-key-file=/etc/kubernetes/pki/sa.pub \ | |
--service-account-signing-key-file=/etc/kubernetes/pki/sa.key \ | |
--service-account-issuer=https://kubernetes.default.svc.cluster.local \ | |
--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \ | |
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota \ | |
--authorization-mode=Node,RBAC \ | |
--enable-bootstrap-token-auth=true \ | |
--requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \ | |
--proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem \ | |
--proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem \ | |
--requestheader-allowed-names=aggregator \ | |
--requestheader-group-headers=X-Remote-Group \ | |
--requestheader-extra-headers-prefix=X-Remote-Extra- \ | |
--requestheader-username-headers=X-Remote-User | |
# --token-auth-file=/etc/kubernetes/token.csv | |
Restart=on-failure | |
RestartSec=10s | |
LimitNOFILE=65535 | |
[Install] | |
WantedBy=multi-user.target |
# 6.2.4 启动 apiserver
所有 Master 节点开启 kube-apiserver：
systemctl daemon-reload && systemctl enable --now kube-apiserver |
检测 kube-server 状态：
# systemctl status kube-apiserver | |
● kube-apiserver.service – Kubernetes API Server | |
Loaded: loaded (/usr/lib/systemd/system/kube-apiserver.service; enabled; vendor preset: disabled) | |
Active: active (running) since Sat 2020-08-22 21:26:49 CST; 26s ago |
如果系统日志有这些提示可以忽略:
Dec 11 20:51:15 k8s-master01 kube-apiserver: I1211 20:51:15.004739 7450 clientconn.go:948] ClientConn switching balancer to “pick_first” | |
Dec 11 20:51:15 k8s-master01 kube-apiserver: I1211 20:51:15.004843 7450 balancer_conn_wrappers.go:78] pickfirstBalancer: HandleSubConnStateChange: 0xc011bd4c80, {CONNECTING <nil>} | |
Dec 11 20:51:15 k8s-master01 kube-apiserver: I1211 20:51:15.010725 7450 balancer_conn_wrappers.go:78] pickfirstBalancer: HandleSubConnStateChange: 0xc011bd4c80, {READY <nil>} | |
Dec 11 20:51:15 k8s-master01 kube-apiserver: I1211 20:51:15.011370 7450 controlbuf.go:508] transport: loopyWriter.run returning. Connection error: desc = “transport is closing” |
# 6.3 ControllerManage
所有 Master 节点配置 kube-controller-manager service（所有 master 节点配置一样）
注意：本文档使用的 k8s Pod 网段为 172.16.0.0/16，该网段不能和宿主机的网段、k8s Service 网段的重复，请按需修改：
[root@k8s-master01 pki]# vim /usr/lib/systemd/system/kube-controller-manager.service | |
[Unit] | |
Description=Kubernetes Controller Manager | |
Documentation=https://github.com/kubernetes/kubernetes | |
After=network.target | |
[Service] | |
ExecStart=/usr/local/bin/kube-controller-manager \ | |
--v=2 \ | |
--root-ca-file=/etc/kubernetes/pki/ca.pem \ | |
--cluster-signing-cert-file=/etc/kubernetes/pki/ca.pem \ | |
--cluster-signing-key-file=/etc/kubernetes/pki/ca-key.pem \ | |
--service-account-private-key-file=/etc/kubernetes/pki/sa.key \ | |
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig \ | |
--authentication-kubeconfig=/etc/kubernetes/controller-manager.kubeconfig \ | |
--authorization-kubeconfig=/etc/kubernetes/controller-manager.kubeconfig \ | |
--leader-elect=true \ | |
--use-service-account-credentials=true \ | |
--node-monitor-grace-period=40s \ | |
--node-monitor-period=5s \ | |
--controllers=*,bootstrapsigner,tokencleaner \ | |
--allocate-node-cidrs=true \ | |
--cluster-cidr=172.16.0.0/16 \ | |
--requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \ | |
--node-cidr-mask-size=24 | |
Restart=always | |
RestartSec=10s | |
[Install] | |
WantedBy=multi-user.target |
所有 Master 节点启动 kube-controller-manager
[root@k8s-master01 pki]# systemctl daemon-reload | |
[root@k8s-master01 pki]# systemctl enable --now kube-controller-manager | |
Created symlink /etc/systemd/system/multi-user.target.wants/kube-controller-manager.service → /usr/lib/systemd/system/kube-controller-manager.service. |
查看启动状态
[root@k8s-master01 pki]# systemctl status kube-controller-manager | |
● kube-controller-manager.service – Kubernetes Controller Manager | |
Loaded: loaded (/usr/lib/ ubern/system/kube-controller-manager.service; enabled; vendor preset: disabled) | |
Active: active (running) since Fri 2020-12-11 20:53:05 CST; 8s ago | |
Docs: https://github.com/ ubernetes/ ubernetes | |
Main PID: 7518 (kube-controller) |
# 6.4 Scheduler
所有 Master 节点配置 kube-scheduler service（所有 master 节点配置一样）
[root@k8s-master01 pki]# vim /usr/lib/systemd/system/kube-scheduler.service | |
[Unit] | |
Description=Kubernetes Scheduler | |
Documentation=https://github.com/kubernetes/kubernetes | |
After=network.target | |
[Service] | |
ExecStart=/usr/local/bin/kube-scheduler \ | |
--v=2 \ | |
--leader-elect=true \ | |
--authentication-kubeconfig=/etc/kubernetes/scheduler.kubeconfig \ | |
--authorization-kubeconfig=/etc/kubernetes/scheduler.kubeconfig \ | |
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig | |
Restart=always | |
RestartSec=10s | |
[Install] | |
WantedBy=multi-user.target |
启动 scheduler：
[root@k8s-master01 pki]# systemctl daemon-reload | |
[root@k8s-master01 pki]# systemctl enable --now kube-scheduler | |
Created symlink /etc/systemd/system/multi-user.target.wants/kube-scheduler.service → /usr/lib/systemd/system/kube-scheduler.service. | |
[root@k8s-master01 pki]# systemctl status kube-scheduler | |
● kube-scheduler.service - Kubernetes Scheduler | |
Loaded: loaded (/usr/lib/systemd/system/kube-scheduler.service; enabled; vendor preset: disabled) | |
Active: active (running) since Wed 2022-05-04 17:31:13 CST; 6s ago | |
Docs: https://github.com/kubernetes/kubernetes | |
Main PID: 5815 (kube-scheduler) | |
Tasks: 9 | |
Memory: 19.8M |
# 7. TLS Bootstrapping 配置
只需要在 Master01 创建 bootstrap
注意： 修改黄色部分的 IP 地址
cd /root/k8s-ha-install/bootstrap | |
kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://192.168.1.70:8443 --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig | |
kubectl config set-credentials tls-bootstrap-token-user --token=c8ad9c.2e4d610cf3e7426e --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig | |
kubectl config set-context tls-bootstrap-token-user@kubernetes --cluster=kubernetes --user=tls-bootstrap-token-user --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig | |
kubectl config use-context tls-bootstrap-token-user@kubernetes --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig | |
[root@k8s-master01 bootstrap]# mkdir -p /root/.kube ; cp /etc/kubernetes/admin.kubeconfig /root/.kube/config |
可以正常查询集群状态，才可以继续往下，否则不行，需要排查 k8s 组件是否有故障（只要有结果即可，如果返回不一样不影响）
# kubectl get cs | |
Warning: v1 ComponentStatus is deprecated in v1.19+ | |
NAME STATUS MESSAGE ERROR | |
controller-manager Healthy ok | |
scheduler Healthy ok | |
etcd-0 Healthy ok |
创建 bootstrap 相关资源：
[root@k8s-master01 bootstrap]# kubectl create -f bootstrap.secret.yaml | |
secret/bootstrap-token-c8ad9c created | |
clusterrolebinding.rbac.authorization.k8s.io/kubelet-bootstrap created | |
clusterrolebinding.rbac.authorization.k8s.io/node-autoapprove-bootstrap created | |
clusterrolebinding.rbac.authorization.k8s.io/node-autoapprove-certificate-rotation created | |
clusterrole.rbac.authorization.k8s.io/system:kube-apiserver-to-kubelet created | |
clusterrolebinding.rbac.authorization.k8s.io/system:kube-apiserver created |
# 8. Node 节点配置
# 8.1 复制证书
Master01 节点复制证书至其他节点：
cd /etc/kubernetes/ | |
for NODE in k8s-master02 k8s-master03 k8s-node01 k8s-node02; do | |
ssh $NODE mkdir -p /etc/kubernetes/pki | |
for FILE in pki/ca.pem pki/ca-key.pem pki/front-proxy-ca.pem bootstrap-kubelet.kubeconfig; do | |
scp /etc/kubernetes/$FILE $NODE:/etc/kubernetes/${FILE} | |
done | |
done |
执行结果：
ca.pem 100% 1407 459.5KB/s 00:00 | |
… | |
bootstrap-kubelet.kubeconfig 100% 2291 685.4KB/s 00:00 |
# 8.2 Kubelet 配置
所有节点创建 Kubelet 配置目录
mkdir -p /var/lib/kubelet /var/log/kubernetes /etc/systemd/system/kubelet.service.d /etc/kubernetes/manifests/ |
所有节点配置 kubelet service
[root@k8s-master01 bootstrap]# vim /usr/lib/systemd/system/kubelet.service | |
[Unit] | |
Description=Kubernetes Kubelet | |
Documentation=https://github.com/kubernetes/kubernetes | |
[Service] | |
ExecStart=/usr/local/bin/kubelet | |
Restart=always | |
StartLimitInterval=0 | |
RestartSec=10 | |
[Install] | |
WantedBy=multi-user.target |
所有节点配置 kubelet service 的配置文件（也可以写到 kubelet.service）：
# Runtime 为 Containerd | |
# vim /etc/systemd/system/kubelet.service.d/10-kubelet.conf | |
[Service] | |
Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig --kubeconfig=/etc/kubernetes/kubelet.kubeconfig" | |
Environment="KUBELET_SYSTEM_ARGS=--container-runtime-endpoint=unix:///run/containerd/containerd.sock" | |
Environment="KUBELET_CONFIG_ARGS=--config=/etc/kubernetes/kubelet-conf.yml" | |
Environment="KUBELET_EXTRA_ARGS=--node-labels=node.kubernetes.io/node='' " | |
ExecStart= | |
ExecStart=/usr/local/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_SYSTEM_ARGS $KUBELET_EXTRA_ARGS |
所有节点创建 kubelet 的配置文件
注意：如果更改了 k8s 的 service 网段，需要更改 kubelet-conf.yml 的 clusterDNS: 配置，改成 k8s Service 网段的第十个地址，比如 10.96.0.10
[root@k8s-master01 bootstrap]# vim /etc/kubernetes/kubelet-conf.yml | |
apiVersion: kubelet.config.k8s.io/v1beta1 | |
kind: KubeletConfiguration | |
address: 0.0.0.0 | |
port: 10250 | |
readOnlyPort: 10255 | |
authentication: | |
anonymous: | |
enabled: false | |
webhook: | |
cacheTTL: 2m0s | |
enabled: true | |
x509: | |
clientCAFile: /etc/kubernetes/pki/ca.pem | |
authorization: | |
mode: Webhook | |
webhook: | |
cacheAuthorizedTTL: 5m0s | |
cacheUnauthorizedTTL: 30s | |
cgroupDriver: systemd | |
cgroupsPerQOS: true | |
clusterDNS: | |
- 10.96.0.10 | |
clusterDomain: cluster.local | |
containerLogMaxFiles: 5 | |
containerLogMaxSize: 10Mi | |
contentType: application/vnd.kubernetes.protobuf | |
cpuCFSQuota: true | |
cpuManagerPolicy: none | |
cpuManagerReconcilePeriod: 10s | |
enableControllerAttachDetach: true | |
enableDebuggingHandlers: true | |
enforceNodeAllocatable: | |
- pods | |
eventBurst: 10 | |
eventRecordQPS: 5 | |
evictionHard: | |
imagefs.available: 15% | |
memory.available: 100Mi | |
nodefs.available: 10% | |
nodefs.inodesFree: 5% | |
evictionPressureTransitionPeriod: 5m0s | |
failSwapOn: true | |
fileCheckFrequency: 20s | |
hairpinMode: promiscuous-bridge | |
healthzBindAddress: 127.0.0.1 | |
healthzPort: 10248 | |
httpCheckFrequency: 20s | |
imageGCHighThresholdPercent: 85 | |
imageGCLowThresholdPercent: 80 | |
imageMinimumGCAge: 2m0s | |
iptablesDropBit: 15 | |
iptablesMasqueradeBit: 14 | |
kubeAPIBurst: 10 | |
kubeAPIQPS: 5 | |
makeIPTablesUtilChains: true | |
maxOpenFiles: 1000000 | |
maxPods: 110 | |
nodeStatusUpdateFrequency: 10s | |
oomScoreAdj: -999 | |
podPidsLimit: -1 | |
registryBurst: 10 | |
registryPullQPS: 5 | |
resolvConf: /etc/resolv.conf | |
rotateCertificates: true | |
runtimeRequestTimeout: 2m0s | |
serializeImagePulls: true | |
staticPodPath: /etc/kubernetes/manifests | |
streamingConnectionIdleTimeout: 4h0m0s | |
syncFrequency: 1m0s | |
volumeStatsAggPeriod: 1m0s |
启动所有节点 kubelet
systemctl daemon-reload | |
systemctl enable --now kubelet |
此时系统日志 /var/log/messages**** 显示只有如下两种信息为正常 ****，安装 calico 后即可恢复
Unable to update cni config: no networks found in /etc/cni/net.d |
如果有很多报错日志，或者有大量看不懂的报错，说明 kubelet 的配置有误，需要检查 kubelet 配置
Master01 查看集群状态 (Ready 或 NotReady 都正常)
[root@k8s-master01 bootstrap]# kubectl get node |
# 8.3 kube-proxy 配置
注意，如果不是高可用集群，192.168.1.70:8443 改为 master01 的地址，8443 改为 apiserver 的端口，默认是 6443
生成 kube-proxy 的证书，以下操作只在 Master01 执行
cd /root/k8s-ha-install/pki | |
cfssl gencert \ | |
-ca=/etc/kubernetes/pki/ca.pem \ | |
-ca-key=/etc/kubernetes/pki/ca-key.pem \ | |
-config=ca-config.json \ | |
-profile=kubernetes \ | |
kube-proxy-csr.json | cfssljson -bare /etc/kubernetes/pki/kube-proxy | |
kubectl config set-cluster kubernetes \ | |
--certificate-authority=/etc/kubernetes/pki/ca.pem \ | |
--embed-certs=true \ | |
--server=https://192.168.1.70:8443 \ | |
--kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig | |
kubectl config set-credentials system:kube-proxy \ | |
--client-certificate=/etc/kubernetes/pki/kube-proxy.pem \ | |
--client-key=/etc/kubernetes/pki/kube-proxy-key.pem \ | |
--embed-certs=true \ | |
--kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig | |
kubectl config set-context system:kube-proxy@kubernetes \ | |
--cluster=kubernetes \ | |
--user=system:kube-proxy \ | |
--kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig | |
kubectl config use-context system:kube-proxy@kubernetes \ | |
--kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig |
将 kubeconfig 发送至其他节点
for NODE in k8s-master02 k8s-master03; do | |
scp /etc/kubernetes/kube-proxy.kubeconfig $NODE:/etc/kubernetes/kube-proxy.kubeconfig | |
done | |
for NODE in k8s-node01 k8s-node02; do | |
scp /etc/kubernetes/kube-proxy.kubeconfig $NODE:/etc/kubernetes/kube-proxy.kubeconfig | |
done |
所有节点添加 kube-proxy 的配置和 service 文件：
vim /usr/lib/systemd/system/kube-proxy.service | |
[Unit] | |
Description=Kubernetes Kube Proxy | |
Documentation=https://github.com/kubernetes/kubernetes | |
After=network.target | |
[Service] | |
ExecStart=/usr/local/bin/kube-proxy \ | |
--config=/etc/kubernetes/kube-proxy.yaml \ | |
--v=2 | |
Restart=always | |
RestartSec=10s | |
[Install] | |
WantedBy=multi-user.target |
如果更改了集群 Pod 的网段，需要更改 kube-proxy.yaml 的 clusterCIDR 为自己的 Pod 网段：
vim /etc/kubernetes/kube-proxy.yaml | |
apiVersion: kubeproxy.config.k8s.io/v1alpha1 | |
bindAddress: 0.0.0.0 | |
clientConnection: | |
acceptContentTypes: "" | |
burst: 10 | |
contentType: application/vnd.kubernetes.protobuf | |
kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig | |
qps: 5 | |
clusterCIDR: 172.16.0.0/16 | |
configSyncPeriod: 15m0s | |
conntrack: | |
max: null | |
maxPerCore: 32768 | |
min: 131072 | |
tcpCloseWaitTimeout: 1h0m0s | |
tcpEstablishedTimeout: 24h0m0s | |
enableProfiling: false | |
healthzBindAddress: 0.0.0.0:10256 | |
hostnameOverride: "" | |
iptables: | |
masqueradeAll: false | |
masqueradeBit: 14 | |
minSyncPeriod: 0s | |
syncPeriod: 30s | |
ipvs: | |
masqueradeAll: true | |
minSyncPeriod: 5s | |
scheduler: "rr" | |
syncPeriod: 30s | |
kind: KubeProxyConfiguration | |
metricsBindAddress: 127.0.0.1:10249 | |
mode: "ipvs" | |
nodePortAddresses: null | |
oomScoreAdj: -999 | |
portRange: "" | |
udpIdleTimeout: 250ms |
所有节点启动 kube-proxy
[root@k8s-master01 k8s-ha-install]# systemctl daemon-reload | |
[root@k8s-master01 k8s-ha-install]# systemctl enable --now kube-proxy | |
Created symlink /etc/systemd/system/multi-user.target.wants/kube-proxy.service → /usr/lib/systemd/system/kube-proxy.service. |
此时系统日志 /var/log/messages**** 显示只有如下两种信息为正常 ****，安装 calico 后即可恢复
Unable to update cni config: no networks found in /etc/cni/net.d |
# 9. Calico 组件的安装
以下步骤只在 master01 执行：
cd /root/k8s-ha-install/calico/ |
更改 calico 的网段，主要需要将红色部分的网段，改为自己的 Pod 网段
sed -i "s#POD_CIDR#172.16.0.0/16#g" calico.yaml |
检查网段是自己的 Pod 网段， grep "IPV4POOL_CIDR" calico.yaml -A 1
查看容器和节点状态：
[root@k8s-master01 calico]# kubectl get po -n kube-system | |
NAME READY STATUS RESTARTS AGE | |
calico-kube-controllers-66686fdb54-mk2g6 1/1 Running 1 (20s ago) 85s | |
calico-node-8fxqp 1/1 Running 0 85s | |
calico-node-8nkfl 1/1 Running 0 86s | |
calico-node-pmpf4 1/1 Running 0 86s | |
calico-node-vnlk7 1/1 Running 0 86s | |
calico-node-xpchb 1/1 Running 0 85s | |
calico-typha-67c6dc57d6-259t8 1/1 Running 0 86s |
如果容器状态异常可以使用 kubectl describe 或者 kubectl logs 查看容器的日志
- Kubectl logs -f POD_NAME -n kube-system
- Kubectl logs -f POD_NAME -c upgrade-ipam -n kube-system
# 10. 安装 CoreDNS
cd /root/k8s-ha-install/ |
如果更改了 k8s service 的网段需要将 coredns 的 serviceIP 改成 k8s service 网段的第十个 IP
COREDNS_SERVICE_IP=`kubectl get svc | grep kubernetes | awk '{print $3}'`0 | |
sed -i "s#KUBEDNS_SERVICE_IP#${COREDNS_SERVICE_IP}#g" CoreDNS/coredns.yaml |
安装 coredns
[root@k8s-master01 k8s-ha-install]# kubectl create -f CoreDNS/coredns.yaml | |
serviceaccount/coredns created | |
clusterrole.rbac.authorization.k8s.io/system:coredns created | |
clusterrolebinding.rbac.authorization.k8s.io/system:coredns created | |
configmap/coredns created | |
deployment.apps/coredns created | |
service/kube-dns created |
# 11. Metrics 部署
在新版的 Kubernetes 中系统资源的采集均使用 Metrics-server，可以通过 Metrics 采集节点和 Pod 的内存、磁盘、CPU 和网络的使用率。
以下操作均在 master01 节点执行，安装 metrics server:
cd /root/k8s-ha-install/metrics-server | |
kubectl create -f . | |
serviceaccount/metrics-server created | |
clusterrole.rbac.authorization.k8s.io/system:aggregated-metrics-reader created | |
clusterrole.rbac.authorization.k8s.io/system:metrics-server created | |
rolebinding.rbac.authorization.k8s.io/metrics-server-auth-reader created | |
clusterrolebinding.rbac.authorization.k8s.io/metrics-server:system:auth-delegator created | |
clusterrolebinding.rbac.authorization.k8s.io/system:metrics-server created | |
service/metrics-server created | |
deployment.apps/metrics-server created | |
apiservice.apiregistration.k8s.io/v1beta1.metrics.k8s.io created |
等待 metrics server 启动然后查看状态：
# kubectl top node | |
NAME CPU(cores) CPU% MEMORY(bytes) MEMORY% | |
k8s-master01 231m 5% 1620Mi 42% | |
k8s-master02 274m 6% 1203Mi 31% | |
k8s-master03 202m 5% 1251Mi 32% | |
k8s-node01 69m 1% 667Mi 17% | |
k8s-node02 73m 1% 650Mi 16% |
如果有如下报错，可以等待 10 分钟后，再次查看：
Error from server (ServiceUnavailable): the server is currently unable to handle the request (get nodes.metrics.k8s.io) |
# 12. Dashboard 部署
# 12.1 安装 Dashboard
Dashboard 用于展示集群中的各类资源，同时也可以通过 Dashboard 实时查看 Pod 的日志和在容器中执行一些命令等。
cd /root/k8s-ha-install/dashboard/ | |
[root@k8s-master01 dashboard]# kubectl create -f . | |
serviceaccount/admin-user created | |
clusterrolebinding.rbac.authorization.k8s.io/admin-user created | |
namespace/kubernetes-dashboard created | |
serviceaccount/kubernetes-dashboard created | |
service/kubernetes-dashboard created | |
secret/kubernetes-dashboard-certs created | |
secret/kubernetes-dashboard-csrf created | |
secret/kubernetes-dashboard-key-holder created | |
configmap/kubernetes-dashboard-settings created | |
role.rbac.authorization.k8s.io/kubernetes-dashboard created | |
clusterrole.rbac.authorization.k8s.io/kubernetes-dashboard created | |
rolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created | |
clusterrolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created | |
deployment.apps/kubernetes-dashboard created | |
service/dashboard-metrics-scraper created | |
deployment.apps/dashboard-metrics-scraper created |
# 12.2 登录 dashboard
在谷歌浏览器（Chrome）启动文件中加入启动参数，用于解决无法访问 Dashboard 的问题，参考下图：
--test-type --ignore-certificate-errors |
更改 dashboard 的 svc 为 NodePort:
kubectl edit svc kubernetes-dashboard -n kubernetes-dashboard |
将 ClusterIP 更改为 NodePort（如果已经为 NodePort 忽略此步骤）
查看端口号：
[root@k8s-master01 ~]# kubectl get svc kubernetes-dashboard -n kubernetes-dashboard | |
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE | |
kubernetes-dashboard NodePort 10.96.139.11 <none> 443:32409/TCP 24h |
根据自己的实例端口号，通过任意安装了 kube-proxy 的宿主机的 IP + 端口即可访问到 dashboard：
访问 Dashboard：https://192.168.1.71:32409 （把 IP 地址和端口改成你自己的）选择登录方式为令牌（即 token 方式），参考下图：
创建登录 Token：
kubectl create token admin-user -n kube-system |
将 token 值输入到令牌后，单击登录即可访问 Dashboard，参考下图：
# 14. Containerd 配置镜像加速
# vim /etc/containerd/config.toml | |
#添加以下配置镜像加速服务 | |
[plugins."io.containerd.grpc.v1.cri".registry.mirrors."docker.io"] | |
endpoint=["https://dockerproxy.com", "https://mirror.baidubce.com","https://ccr.ccs.tencentyun.com","https://docker.m.daocloud.io","https://docker.nju.edu.cn","https://docker.mirrors.ustc.edu.cn","https://registry-1.docker.io", "https://hbv0b596.mirror.aliyuncs.com"] | |
[plugins."io.containerd.grpc.v1.cri".registry.mirrors."registry.k8s.io"] | |
endpoint=["https://dockerproxy.com", "https://mirror.baidubce.com","https://ccr.ccs.tencentyun.com","https://docker.m.daocloud.io","https://docker.nju.edu.cn","https://docker.mirrors.ustc.edu.cn","https://hbv0b596.mirror.aliyuncs.com", "https://k8s.m.daocloud.io", "https://docker.mirrors.ustc.edu.cn","https://hub-mirror.c.163.com"] |
所有节点重新启动 Containerd：
# systemctl daemon-reload | |
# systemctl restart containerd |
# 15. Docker 配置镜像加速
# sudo mkdir -p /etc/docker | |
# sudo tee /etc/docker/daemon.json <<-'EOF' | |
{ | |
"registry-mirrors": [ | |
"https://docker.credclouds.com", | |
"https://k8s.credclouds.com", | |
"https://quay.credclouds.com", | |
"https://gcr.credclouds.com", | |
"https://k8s-gcr.credclouds.com", | |
"https://ghcr.credclouds.com", | |
"https://do.nark.eu.org", | |
"https://docker.m.daocloud.io", | |
"https://docker.nju.edu.cn", | |
"https://docker.mirrors.sjtug.sjtu.edu.cn", | |
"https://docker.1panel.live", | |
"https://docker.rainbond.cc" | |
], | |
"exec-opts": ["native.cgroupdriver=systemd"] | |
} | |
EOF |
所有节点重新启动 Docker：
# systemctl daemon-reload | |
# systemctl enable --now docker |
