Nginx 配置文件升级和回滚

1. 简介

  Nginx在升级之前，将站点目录指定到临时升级目录。这样访问站点的时候会页面会显示正在升级，升级完毕后在指定回来。

2. 脚本内容

nginx 配置文件升级和回滚

    #!/bin/sh
    # update and rollback the nginx withing no perception.
    # file : Configuration files refer to nginx vhosts file

    source_path=/opt/backup
    update_nginx_conf_file=/usr/local/nginx/conf/backconf/maintain.conf
    nginx_root_conf=/usr/local/nginx/conf/vhosts/

    #---------------------------------------------------------------------
    # function: check parameter 
    #
    #---------------------------------------------------------------------

    if [ "$#" -ne 2 ];then
        echo "the parameter is not equal to 2"
        echo "USG: sh $0 update|rollback nginx_confile"
        exit 1
    fi

    #---------------------------------------------------------------------
    # function: check nginx confile and reload
    #
    #---------------------------------------------------------------------
    reload_nginx(){
         /usr/local/nginx/sbin/nginx -t
         if [ $? -eq 0 ];then
            /usr/local/nginx/sbin/nginx -s reload 
         else  
             echo "nginx 配置文件出错"
             exit 1
         fi
    }

    #---------------------------------------------------------------------
    # function: update nginx file 
    #
    #---------------------------------------------------------------------
    update(){
        file=$1
        [ ! -d $source_path ] && mkdir -p $source_path
        mv $nginx_root_conf/$file.conf $source_path
        cp $update_nginx_conf_file $nginx_root_conf/$file.conf
        reload_nginx
    }
    #---------------------------------------------------------------------
    # function: rollback nginx file
    #
    #---------------------------------------------------------------------
    rollback(){
        [ ! -e $source_path/${file}.conf ] && {
            echo "can not find  $source_path/${file}.conf" 
            exit 1
        } 
        mv $source_path/${file}.conf nginx_root_conf
        reload_nginx
    }
    #---------------------------------------------------------------------
    # function: show all vhosts machine withing nginx conf name
    #
    #---------------------------------------------------------------------
    help_nginx_vhosts(){
        path=/usr/local/nginx/conf/vhosts
        for item in $(ls -l $path |grep -v total|awk '{print $NF}'|awk -F. '/conf$/{print $1}')
        do
            echo "     $item"
        done
    }
    #---------------------------------------------------------------------
    # function: check nginx configuration file legitimacy
    #
    #---------------------------------------------------------------------
    check_nginx_file(){
        nginx_conf_file=$1
        path=/usr/local/nginx/conf/vhosts
        all_vhosts=$(ls -l $path |grep -v total|awk '{print $NF}'|awk -F. '/conf$/{print $1}')
        num=$(echo $all_vhosts|grep -w $nginx_conf_file|wc -l)
        if [ $num -eq 0 ];then
            echo "Error: input nginx conf file is not find.The current configuration file is as follows:"
            help_nginx_vhosts
            exit 1
        fi
    }
    #---------------------------------------------------------------------
    # function: Program Entry 
    #
    #---------------------------------------------------------------------
    main(){
        action=$1
        file=$2
        if [ $action == "update" ];then
            check_nginx_file $file
            echo "now this system nginx withing $file.conf will update"
            update $file

        elif [ $action == "rollback" ];then
            echo "now this system nginx withing $file.conf will rollback"
            check_nginx_file $file
            rollback $file
        else
            echo "error: This operation is not allowed"
            echo "USG: sh $0 update|rollback nginx_confile"
        fi
    }

    main $1 $2