《二》Kubernetes集群部署-搭建集群

多master集群架构图

时间必须同步、关闭防火墙、Firewalld、selinux

1、拷贝master01 中的kubernetes目录到master02上
[root@docker ~]# scp -r /opt/kubernetes/ 192.168.1.16:/opt/

2、启动脚本
[root@docker kubeconfig]# scp /usr/lib/systemd/system/{kube-apiserver,kube-controller-manager,kube-scheduler}.service 192.168.1.16:/usr/lib/systemd/system/

3、拷贝master01 中的etcd目录到master02上
[root@docker ~]# scp -r /opt/etcd/ 192.168.1.16:/opt/

4、登录到master02(192.168.1.16)上修改IP配置信息
只需要修改vi /opt/kubernetes/cfg/kube-apiserver 更改为192.168.1.16

5、启动
systemctl start kube-apiserver
systemctl start kube-scheduler
systemctl start kube-controller-manager
systemctl enable kube-apiserver
systemctl enable kube-scheduler
systemctl enable kube-controller-manager

验证：
《二》Kubernetes集群部署-搭建集群

《二》Kubernetes集群部署-搭建集群

Load Balancer 安装nginx/keepalived

192.168.1.20
[root@docker nginx]# vi /etc/yum.repos.d/nginx.repo

[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/7/$basearch/
gpgcheck=0

[root@docker nginx]# yum install nginx -y
[root@docker nginx]# yum install keepalived -y

192.168.1.26
[root@docker nginx]# vi /etc/yum.repos.d/nginx.repo

[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/7/$basearch/
gpgcheck=0

[root@docker nginx]# yum install nginx -y
[root@docker nginx]# yum install keepalived -y

修改nginx配置文件
新增：
stream {

log_format main '$remote_addr $upstream_addr - [$time_local] $status $upstream_bytes_sent';
access_log /var/log/nginx/k8s-access.log main;

upstream k8s-apiserver {
    server 192.168.1.13:6443;
    server 192.168.1.16:6443;
}

server {
listen 6443;
proxy_pass k8s-apiserver;

}

《二》Kubernetes集群部署-搭建集群

vi /etc/keepalived/keepalived.conf
[root@docker ~]# cat /etc/keepalived/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/nginx/check_nginx.sh"
}

vrrp_instance VI_1 {
state MASTER
interface ens33 #根据自己的网卡名字更改
virtual_router_id 51 # VRRP 路由 ID实例，每个实例是唯一的
priority 100 # 优先级，备服务器设置 90,哪个高就是主
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 {
192.168.1.30/24
}
track_script {
check_nginx
}
}

[root@docker ~]# vi /etc/nginx/check_nginx.sh

count=$(ps -ef |grep nginx |egrep -cv "grep|$$")

if [ "$count" -eq 0 ];then
systemctl stop keepalived
fi

实验：
2台机都启动 nginx、keepalived服务后，在主节点上会有一个vip(192.168.1.30)
192.168.1.20
echo 'nginx master' > /usr/share/nginx/html/index.html

192.168.1.26
echo 'nginx backup' > /usr/share/nginx/html/index.html

验证：
访问192.168.1.30 ---》nginx master
/etc/nginx/check_nginx.sh
当把主节点的nginx关闭，pkill nginx时，keepalived会每隔1秒检测check_nginx，会执行脚本/etc/nginx/check_nginx.sh，停止掉keepalived服务，这样vip会转移到backup上去，当当把主节点的nginx，keepalived开启，vip又会回到主节点上