suse 12 Binary Deployment Kubernetets 1.19.7-Chapter 05-Deploy kube-nginx

1.5, deploy kube-nginx

• masterNode needskube-nginx

• Use Nginx 4-layer transparent proxy function to achieve high availability of k8s nodes (master nodes and nginx nodes) to access kube-apiserver

• The kube-controller-manager and kube-scheduler of the control node are multi-instance deployments, so as long as one instance is normal, the cluster can be highly available

• Pods in the cluster use k8s service domain name kubernetes to access kube-apiserver, kube-dns will automatically resolve the IP of multiple kube-apiserver nodes, so it is also highly available

• In each Nginx process, the backend is connected to multiple apiserver instances, and Nginx performs health checks and load balancing on them

1.5.0, download nginx binary file

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, compile and deploy 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 Enable Layer 4 transparent forwarding (TCP Proxy) function
• --without-xxx Turn off the function, so that the generated dynamic link binary program depends on the least

1.5.2, configure 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

• Note: The ip address to master节点the ip,以自己的环境为准

1.5.3, configure nginx as systemctl management

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, distribute nginx binary files and configuration files

#!/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, start kube-nginx service

#!/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