K8s多节点部署+负载均衡+keepalived ——囊萤映雪

K8s多节点部署+负载均衡+keepalived ——囊萤映雪

1、多节点master2 部署

2、负载均衡部署+keepalived

1、多节点master2部署：

#从master01节点上拷贝证书文件、各master组件的配置文件和服务管理文件到master02节点
scp -r /opt/etcd/ 20.0.0.20:/opt/
scp -r /opt/kubernetes/ 20.0.0.20:/opt/
scp /usr/lib/systemd/system/{kube-apiserver,kube-controller-manager,kube-scheduler}.service root@192.168.80.14:/usr/lib/systemd/system/

#修改配置文件kube-apiserver中的IP
vim /opt/kubernetes/cfg/kube-apiserver
--bind-address=20.0.0.20	#修改
--advertise-address=20.0.0.20

#在master02节点上启动各服务并设置开机自启
systemctl enable --now kube-apiserver.service kube-controller-manager.service kube-scheduler.service

#查看node节点状态
ln -s /opt/kubernetes/bin/* /usr/local/bin/
kubectl get nodes
kubectl geet nodes -o wide	#-o wide:输出额外信息，对于pod，将输出pod所在的node名

#此时在master02节点查到的node节点状态仅是从etcd查询到的信息，而此时node节点实际上并未与master02节点建立通信连接，因此需要使用一个VIP把node节点与master节点都关联起来

　　

2、负载均衡部署+keepalived ：

配置nginx的官方在线yum源，配置本地nginx的yum源
cat > /etc/yum.repos.d/nginx.repo << 'EOF'
[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/7/$basearch/
gpgcheck=0
EOF

yum install nginx -y　　

修改nginx配置文件，配置四层反向代理负载均衡，指定k8s群集2台master的节点ip和6443端口
vim /etc/nginx/nginx.conf
events {
worker_connections  1024;
}

#添加
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 192.168.80.11:6443;
    server 192.168.80.14:6443;
}
server {
    listen 6443;
    proxy_pass k8s-apiserver;
}
}

http {
......　

检查配置文件语法
nginx -t 

启动nginx服务，查看已监听6443端口
systemctl enable --now nginx
netstat -natp | grep nginx 

将nginx.conf传到20.0.0.90
scp /etc/nginx/nginx.conf 20.0.0.90:/etc/nginx/nginx.conf

部署keepalived服务
yum install keepalived -y

修改keepalived配置文件
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
# 接收邮件地址
notification_email {
 acassen@firewall.loc
 failover@firewall.loc
 sysadmin@firewall.loc
}
# 邮件发送地址
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id NGINX_MASTER	#lb01节点的为 NGINX_MASTER，lb02节点的为 NGINX_BACKUP
}

#添加一个周期性执行的脚本
vrrp_script check_nginx {
script "/etc/nginx/check_nginx.sh"	#指定检查nginx存活的脚本路径
}

vrrp_instance VI_1 {
state MASTER			#lb01节点的为 MASTER，lb02节点的为 BACKUP
interface ens33			#指定网卡名称 ens33
virtual_router_id 51	#指定vrid，两个节点要一致
priority 100			#lb01节点的为 100，lb02节点的为 90
advert_int 1
authentication {
    auth_type PASS
    auth_pass 1111
}
virtual_ipaddress {
    192.168.80.100/24	#指定 VIP
}
track_script {
    check_nginx			#指定vrrp_script配置的脚本
}
}

　

创建nginx状态检查脚本
vim /etc/nginx/check_nginx.sh
#!/bin/bash
#egrep -cv "grep|$$" 用于过滤掉包含grep 或者 $$ 表示的当前Shell进程ID
count=$(ps -ef | grep nginx | egrep -cv "grep|$$")

if [ "$count" -eq 0 ];then
systemctl stop keepalived
fi
chmod +x /etc/nginx/check_nginx.sh

将keepalived.conf、check_nginx.sh传到20.0.0.90
scp check_nginx.sh keepalived.conf 20.0.0.90:`pwd`

启动keepalived服务（一定要先启动了nginx服务，再启动keepalived服务）
systemctl start keepalived
systemctl enable keepalived
ip a

修改node节点上的bootstrap.kubeconfig,kubelet.kubeconfig配置文件为VIP

cd /opt/kubernetes/cfg/
vim bootstrap.kubeconfig
server: https://20.0.0.100:6443

vim kubelet.kubeconfig
server: https://20.0.0.100:6443

vim kube-proxy.kubeconfig
server: https://20.0.0.100:6443

//重启kubelet和kube-proxy服务
systemctl restart kubelet.service
systemctl restart kube-proxy.service

创建pod测试
#master01上创建
kubectl create deploy nginx-text --image=nginx
#master02上创建
kubectl create deploy nginx-master2 --image=nginx

在对应网段的node节点上操作，可以直接使用浏览器或者curl命令访问
curl 172.17.72.2

这时在master01节点上查看nginx日志，发现没有权限查看
kubectl logs nginx-text-78cc774878-4wv7n

在master01节点上，将cluster-admin角色授予用户system：anonymous
kubectl create clusterrolebinding cluster-system-anonymous --clusterrole=cluster-admin --user=system:anonymous