多测试版本部署的实验

事情的缘由是这样，工作中经常出现多个版本同时开发提交测试的需求。现在是排队部署，比较痛苦。
所以想到Docker+jenkins+nginx来搞这件事。
jenkins在Docker中，需要注意的是nginx配置文件要挂在到jenkins在主机的目录中。
第一次写这么长的脚本，比较挫，凑合着看吧，大致的脚本如下 :

PORT=""
CHECK_PORT=0
CONTAINER_ID=""
CONTAINER_NAME=""
IMAGE_NAME=""
DOMAIN="demo.com"
BRANCH=""
#将nginx容器配置文件目录挂载到jenkins_home中
NGINX_CONF_PATH="/var/jenkins_home/nginx/conf.d"
TMP_NGINX_CONF=""
check_port(){
    echo "check whether the port is occupied"
    result=$(netstat -tlpn|grep "$1")
    if [ ! -z "$result" ]; then
        echo "again"
        CHECK_PORT=0
    else
        CHECK_PORT=1
    fi  
    
}

get_port(){
    echo "start random port"
    PORT=$(($RANDOM+10000))
    #PORT=80
    echo "port:${PORT}"
    check_port $PORT
    if [ $CHECK_PORT = 0 ]; then
        get_port
    fi
     
}
cd build
echo $(pwd)
cp ../target/*.jar .
BRANCH=${GIT_BRANCH}
BRANCH=${BRANCH#origin/}
CONTAINER_NAME="demo-$BRANCH"
IMAGE_NAME=demo:$BRANCH
docker rm -f $CONTAINER_NAME 2>/dev/null
docker rmi -f $IMAGE_NAME 2>/dev/null
docker build -t $IMAGE_NAME .

get_port
echo "finally PORT:$PORT"
CONTAINER_ID=$(docker run -it -d -p $PORT:8080 --name $CONTAINER_NAME $IMAGE_NAME)
echo $CONTAINER_ID
##Multi-domain
SERVER="server {
    listen       80;
    server_name  "$BRANCH.$DOMAIN";  
    location / {   
       proxy_set_header Host \$host;
       proxy_set_header X-Real-Ip \$remote_addr;
       proxy_set_header X-Forwarded-For \$remote_addr;
       proxy_pass http://172.20.20.25:$PORT;
    }  
    error_page   500 502 503 504  /50x.html;  
    location = /50x.html { 
        root   /usr/share/nginx/html; 
    }  
}"
echo "ouput nginx config"
echo "$SERVER">"$NGINX_CONF_PATH/$CONTAINER_NAME.conf"
echo "restart nginx"
docker exec nginx /usr/sbin/nginx -s reload```