kuberenetes 的多节点集群与高可用配置
标签（空格分隔）： kubernetes系列
一： kubernetes master 节点的 高可用
二： 配置nginx 服务器
- 三： 配置nginx 的LB 的 keepalived 高可用
一： kubernetes master 节点的 高可用
kubernetes 的多master集群架构
kubernetes 高可用主要在于apiserver
部署master01 IP 地址： 192.168.100.12
在 192.168.100.12 部署与 master01 一样的 服务
scp -r /opt/kubernetes/ [email protected]:/opt/
scp -r /opt/etcd/ [email protected]:/opt/
scp /usr/bin/kubectl [email protected]:/usr/bin/
scp /usr/lib/systemd/system/kube-* [email protected]:/usr/lib/systemd/system/
修改 配置文件
cd /opt/kubernetes/cfg
vim kube-apiserver
---
--bind-address=192.168.100.12
--advertise-address=192.168.100.12
启动服务：
service kube-apiserver start
service kube-controller-manager start
service kube-scheduler start
login :
192.168.20.12
kubectl get cs
配置负载均衡nginx
nginx 服务器 地址： 192.168.100.15
nginx 的yum 包地址
http://nginx.org/en/linux_packages.html
cd /etc/yum.repos.d/
vim nginx.repo
---
[nginx-stable]
name=nginx stable repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
gpgcheck=1
enabled=1
gpgkey=https://nginx.org/keys/nginx_signing.key
[nginx-mainline]
name=nginx mainline repo
baseurl=http://nginx.org/packages/mainline/centos/$releasever/$basearch/
gpgcheck=1
enabled=0
gpgkey=https://nginx.org/keys/nginx_signing.key
---yum install nignx 
cd /etc/nginx/
vim nginx.conf
增加：
---
stream {
log_format main "$remote_addr $upstream_addr $time_local $status";
access_log /var/log/nginx/k8s-access.log main;
upstream k8s-apiserver {
server 192.168.100.11:6443;
server 192.168.100.12:6443;
}
server {
listen 192.168.100.15:6443;
proxy_pass k8s-apiserver;
}
}
···
修改node 节点的 master 服务器指向
login : 192.168.20.13
cd /opt/kubernetes/cfg/
vim bootstrap.kubeconfig
---
server: https://192.168.100.11:6443 改成：
server: https://192.168.100.15:6443
---
vim kubelet.kubeconfig
----
server: https://192.168.100.11:6443 改成：
server: https://192.168.100.15:6443
----
vim kube-proxy.kubeconfig
----
server: https://192.168.100.11:6443 改成：
server: https://192.168.100.15:6443
----
scp bootstrap.kubeconfig kubelet.kubeconfig kube-proxy.kubeconfig [email protected]:/opt/kubernetes/cfg/
重新启动 node 节点的 kubelet 和 kube-proxy
service kubelet restart
service kube-proxy restart
使用 主节点 配置 测试
kubectl get nodes
三： 配置nginx 的LB 的 keepalived 高可用
login 192.168.100.16
安装nginx 服务器 同上 192.168.100.15 一样
修改 ：
vim /etc/nginx/nginx.conf
----
stream {
log_format main "$remote_addr $upstream_addr $time_local $status";
access_log /var/log/nginx/k8s-access.log main;
upstream k8s-apiserver {
server 192.168.100.11:6443;
server 192.168.100.12:6443;
}
server {
listen 192.168.100.16:6443;
proxy_pass k8s-apiserver;
}
}
---
service nginx start 
配置keepalive 高可用
yum install keepalived
keepalived 的配置文件
cd /etc/keepalived/
vim keepalived.conf
---
! Configuration File for keepalived
global_defs {
# 接收邮件地址
notification_email {
[email protected]
[email protected]
[email protected]
}
# 邮件发送地址
notification_email_from [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id NGINX_MASTER
}
vrrp_script check_nginx {
script "/etc/keepalived/check_nginx.sh"
}
vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 51 # VRRP 路由 ID实例，每个实例是唯一的
priority 100 # 优先级，备192.168.100.16服务器设置 90
advert_int 1 # 指定VRRP 心跳包通告间隔时间，默认1秒
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.100.70/24
}
track_script {
check_nginx
}
}
----
配置 检查 nginx 进程 检查
cd /etc/keepalived/
vim check_nginx.sh
---
#!/bin/bash
count=$(ps -ef |grep nginx |egrep -cv "grep|$$")
if [ "$count" -eq 0 ];then
/etc/init.d/keepalived stop
fi
---service keepalived start
ps -ef |grep keepalived 
cd /etc/keepalived
scp check_nginx.sh keepalived.conf [email protected]:/etc/keepalived/
login: 192.168.100.16
cd /etc/keepalived/
vim keepalived.conf
---
改 priority 100 为 priority 90
----
serivice keepalived start
ps -ef |grep keepalived 
改 node 节点的 IP 地址
修改node 节点的 master 服务器指向
login : 192.168.20.13
cd /opt/kubernetes/cfg/
vim bootstrap.kubeconfig
---
server: https://192.168.100.15:6443 改成：
server: https://192.168.100.70:6443
---
vim kubelet.kubeconfig
----
server: https://192.168.100.15:6443 改成：
server: https://192.168.100.70:6443
----
vim kube-proxy.kubeconfig
----
server: https://192.168.100.15:6443 改成：
server: https://192.168.100.70:6443
----
scp bootstrap.kubeconfig kubelet.kubeconfig kube-proxy.kubeconfig [email protected]:/opt/kubernetes/cfg/
重新启动 node 节点的 kubelet 和 kube-proxy
service kubelet restart
service kube-proxy restart
login: 192.168.100.15
修改 nginx 的 配置文件
cd /etc/nginx/
vim nginx.conf
----
将linsten 192.168.100.15：6443 改为： 0.0.0.0：6443
----
service nginx restart 
login: 192.168.100.16
修改 nginx 的 配置文件
cd /etc/nginx/
vim nginx.conf
----
将linsten 192.168.100.16：6443 改为： 0.0.0.0：6443
----
service nginx restart 
去master01 节点上面查看
kubectl get svc
kubectl get svc,pods -n kube-system --all-namespaces
去master02 节点上面查看
kubectl get svc
kubectl get svc,pods -n kube-system --all-namespaces
