suse 12 二进制部署 Kubernetets 1.19.7 - 第05章 - 部署kube-nginx

1.5、部署kube-nginx

• master节点需要kube-nginx

• 使用Nginx 4层透明代理功能实现k8s节点(master节点和nginx节点)高可用访问kube-apiserver

• 控制节点的kube-controller-manager、kube-scheduler是多实例部署，所以只要一个实例正常，就可以保证集群高可用

• 集群内的Pod使用k8s服务域名kubernetes访问kube-apiserver，kube-dns会自动解析多个kube-apiserver节点的IP，所以也是高可用的

• 在每个Nginx进程，后端对接多个apiserver实例，Nginx对他们做健康检查和负载均衡

1.5.0、下载nginx二进制文件

k8s-01:~ # cd /opt/k8s/packages/
k8s-01:/opt/k8s/packages # wget http://nginx.org/download/nginx-1.16.1.tar.gz
k8s-01:/opt/k8s/packages # tar xf nginx-1.16.1.tar.gz

1.5.1、编译部署nginx

k8s-01:~ # cd /opt/k8s/packages/nginx-1.16.1/
k8s-01:/opt/k8s/packages/nginx-1.16.1 # ./configure --prefix=$(pwd)/nginx-prefix \
--with-stream \
--without-http \
--without-http_uwsgi_module && \
make && \
make install

• --with-stream 开启 4 层透明转发(TCP Proxy)功能
• --without-xxx 关闭功能，这样生成的动态链接二进制程序依赖最小

1.5.2、配置nginx.conf

k8s-01:~ # cd /opt/k8s/conf/
k8s-01:/opt/k8s/conf # cat > kube-nginx.conf <<EOF
worker_processes 1;
events {
    
    
    worker_connections  1024;
}
stream {
    
    
    upstream backend {
    
    
        hash \$remote_addr consistent;
        server 192.168.72.39:6443        max_fails=3 fail_timeout=30s;
        server 192.168.72.40:6443        max_fails=3 fail_timeout=30s;
        server 192.168.72.41:6443        max_fails=3 fail_timeout=30s;
    }
    server {
    
    
        listen *:8443;
        proxy_connect_timeout 1s;
        proxy_pass backend;
    }
}
EOF

• 注：将ip地址改为master节点的ip，以自己的环境为准

1.5.3、配置nginx为systemctl管理

k8s-01:~ # cd /opt/k8s/conf/
k8s-01:/opt/k8s/conf # cat > kube-nginx.service <<EOF
[Unit]
Description=kube-apiserver nginx proxy
After=network.target
After=network-online.target
Wants=network-online.target
[Service]
Type=forking
ExecStartPre=/opt/k8s/server/kube-nginx/sbin/nginx \
          -c /opt/k8s/server/kube-nginx/conf/kube-nginx.conf \
          -p /opt/k8s/server/kube-nginx -t
ExecStart=/opt/k8s/server/kube-nginx/sbin/nginx \
       -c /opt/k8s/server/kube-nginx/conf/kube-nginx.conf \
       -p /opt/k8s/server/kube-nginx
ExecReload=/opt/k8s/server/kube-nginx/sbin/nginx \
        -c /opt/k8s/server/kube-nginx/conf/kube-nginx.conf \
        -p /opt/k8s/server/kube-nginx -s reload
PrivateTmp=true
Restart=always
RestartSec=5
StartLimitInterval=0
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF

1.5.4、分发nginx二进制文件和配置文件

#!/usr/bin/env bash
source /opt/k8s/bin/k8s-env.sh

for host in ${MASTER_IPS[@]}
do
    printf "\e[1;34m${host}\e[0m\n"
    ssh root@${host} "mkdir -p /opt/k8s/server/kube-nginx/{conf,logs,sbin}"
    scp /opt/k8s/packages/nginx-1.16.1/nginx-prefix/sbin/nginx ${host}:/opt/k8s/server/kube-nginx/sbin/
    scp /opt/k8s/conf/kube-nginx.conf ${host}:/opt/k8s/server/kube-nginx/conf/
    scp /opt/k8s/conf/kube-nginx.service ${host}:/etc/systemd/system/
done

1.5.5、启动kube-nginx服务

#!/usr/bin/env bash
source /opt/k8s/bin/k8s-env.sh

for host in ${MASTER_IPS[@]}
do
    printf "\e[1;34m${host}\e[0m\n"
    ssh root@${host} "systemctl daemon-reload && \
                      systemctl enable kube-nginx --now && \
                      systemctl status kube-nginx | grep Active"
done