background

In the project deployment docker, when updating the project, you need to stop the original container and start the new container, so there will be a window period, resulting in unavailability Solution:
map different ports and start a new container, and forward nginx to the new container, stop the old container

Concrete operation

说明

The nginx configuration file cannot be placed in the default nginx.conf
The project_name in the startup script start.sh 不能has an inclusion relationship (on the same server, if there is an inclusion relationship, the included container will be stopped)
The port entered when the project starts must 存在be in the nginx configuration file upstream-app.conf

nginx configuration

Profile 1

The name is arbitrary, example app.conf

server {
	listen       80;
	# 修改为你自己的域名
    server_name xx.venny.cn;

	location / {
		proxy_set_header Host $host;
		root /app/html/;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header REMOTE-HOST $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
		try_files $uri $uri/ /index.html;
		index /index.html;
	}


        location /api/ {
                proxy_set_header Host $host;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header REMOTE-HOST $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                add_header Access-Control-Allow-Methods *;
                add_header Access-Control-Allow-Origin $http_origin;
                # 与自定义的保持一致
                proxy_pass http://stream-app/;
        }
}

Profile 2

Any name, example: upstream-app.conf

# 自定义upstream名
upstream stream-app {
# server 127.0.0.1:8000 weight=10;
# server 127.0.0.1:8001 weight=10;
# server 127.0.0.1:8002 weight=10;
# server 127.0.0.1:8003 weight=10;
# server 127.0.0.1:8004 weight=10;
# server 127.0.0.1:8005 weight=10;
# server 127.0.0.1:8006 weight=10;
# server 127.0.0.1:8007 weight=10;
# server 127.0.0.1:8008 weight=10;
# server 127.0.0.1:8009 weight=10;
}

Write nginx replacement script (used to perform port replacement)

The name is replace.sh

#!/bin/bash
port=$1
conf_name=$2
cat $conf_name | while read l
do
 if [[ $l =~ "127.0.0.1:$port" ]];then
  #去除#号
  echo ${l##*#}
 elif  [[ $l =~ "server" ]];then
  #添加#号
  if [[ !($l =~ '#') ]];then
    echo '# '$l
  else
    echo $l
  fi
 else
  echo $l
 fi
done

Write a startup script

start.sh


#/bin/bash

check_y(){
    
    
  if [ -n "$1" ] && [ "$1" = 'y' ];then
    echo 1
  else
    echo 0
  fi
}
# 指定项目nginx配置文件位置，根据实际位置填写
ng_path=/etc/nginx/
# 指定项目upstream配置文件名称
ng_conf_name=upstream-qin.conf
# 指定项目名称
project_name=app
# 版本默认取当前日期
version=$(date +%Y%m%d%H%M%S)
echo '当前版本号:'$version

read -rp "请输入启动端口号：" port

echo '当前启动端口:'$port

echo "开始构建容器"
docker build -t $project_name:$version .
echo "容器构建成功！"
sleep 5

echo "容器启动中...."
# 健康检查（接口/health必须存在，否则健康检查失败）、及启动项目,容器启动端口固定8080
container_full_id=$(docker run \
--health-cmd="curl --fail localhost:8080/health || exit 1" \
--health-interval=5s \
--health-retries=15 \
--health-timeout=10s \
-itd -p $port:8080 --name=$project_name$version -v /app/logs:/logs -v /etc/localtime:/etc/localtime $project_name:$version)

echo "容器启动完毕...."

container_id=$(echo $container_full_id|cut -b 1-12)

echo "容器id为$container_id"

echo '开始健康检查'

health=1

while [[ -z "$(docker ps -a -f id=${
      
      container_id} -f health=healthy | awk 'NR>1 {print $1}')" ]]
do
  echo '执行中....'
  if [[ "$(docker ps -a -f id=${
      
      container_id} -f health=unhealthy | awk 'NR>1 {print $1}')" == $container_id ]];then
    echo '健康检查失败'
    health=2
    break
  fi
  sleep 5;
done

if [[ $health != 1 ]];then
   exit
fi

echo '健康检查成功'

sleep 3

echo "开始修改nginx配置"

sleep 1
# 替换nginx upstream文件
./replace.sh $port ${ng_path}${ng_conf_name} > ${project_name}.ng.conf.temp

cat ${project_name}.ng.conf.temp > ${ng_path}${ng_conf_name}

rm -f ${project_name}.ng.conf.temp


echo 'nginx配置修改成功'

echo '当前配置：'

cat ${ng_path}${ng_conf_name}

sleep 2

read -rp '是否重启nginx  y/n：' reload_ngx

if [ "$(check_y $reload_ngx)" = "1" ];then
    nginx -s reload
    echo '重启nginx'
else
  exit
fi

sleep 1
echo "开始关闭旧容器"

sleep 10

if [ -n "$container_id" ];then
close_containers=$(docker ps |grep $project_name|grep -v $container_id|awk '{print "docker rm -f "$1}'|/bin/bash)

echo $close_containers

for cc in $close_containers
do
  echo "关闭容器$cc"
done

fi

read -rp '是否删除旧镜像y/n:' del_imgs

if [ "$(check_y $del_imgs)" = "1" ];then
  echo "开始删除原镜像"
  sleep 1
  docker images|grep -v $version|grep $project_name|awk '{print "docker rmi -f "$1":"$2}'|/bin/bash
fi

The dockerfile is written normally

omit

Authorize the script

chmod +x start.sh

Execute the ./start script

./start

Enter the port number according to the prompt (the port number must exist in upstream-app), and enter y, y in sequence

docker project switch (nginx), restart shell script

docker project switch, restart script