工作中实用的Shell脚本实例

转自：https://www.jianshu.com/p/093d712c777d

1. 扫描主机端口状态

#!/bin/bash
HOST=$1
PORT="22 80 8080 3306"
for PORT in $PORT; do
    if echo &>/dev/null > /dev/tcp/$HOST/$PORT; then
        echo "$PORT open"
    else
        echo "$PORT close"
    fi
done

2. 代码上线脚本

#!/bin/bash
# code online
# author: ren
PROJT_DIR=/usr/local/nginx/html
OLD_DIR=/usr/local/nginx/html/web1
PROJT=web1
BACKUP_DIR=/data/backup
DATA_CHMOD=www
DATE=`date +%F`
NEW_DIR=/data/web1
# 关闭nginx
function stop_nginx() {
  /usr/bin/systemctl stop nginx
  if [ $? -eq 0 ];then
     echo "nginx is stopd"
  else
     echo "nginx is not stop please check..."
     exit 1
  fi
}

#2 备份原有数据
function backup_data() {
  if [ -d $BACKUP_DIR/$DATE'-'$PROJT ];then
    echo "DIR $BACKUP_DIR/$DATE'-'$PROJT is exist"
    exit 2
  else
    mv $OLD_DIR $BACKUP_DIR/$DATE'-'$PROJT
  fi
}

# 3移动新的代码 项目目录  注：此代码目录需手动上传解压 
function new_code() {
  if [ -d $NEW_DIR ];then
     mv $NEW_DIR $PROJT_DIR
  else
     echo "NEW_DIR is not exist"
     exit 3
  fi
}

# 4 修改权限
function chmod_news() {
  chown -R $DATA_CHMOD.$DATA_CHMOD $OLD_DIR
}

# 5 启动服务
function start_nginx() {
  /usr/bin/systemctl start nginx
  if [ $? -eq 0 ];then
    echo "nginx start ok"
  else
    echo "ngin is not start,please check..."
  fi
}

stop_nginx
backup_data
new_code
chmod_news
start_nginx

3. 检测MySQL主从复制是否异常

#!/bin/bash
user="root"
password="123456"
mycmd="mysql -u$user -p$password -h 192.168.1.88"

function chkdb() {
list=($($mycmd -e "show slave status G"|egrep "Running|Behind"|awk -F: '{print $2}'))
if [ ${list[0]} = "Yes" -a ${list[1]} = "Yes" -a ${list[2]} -lt 120 ]
then echo "Mysql slave is ok"
else echo "Mysql slave replation is filed"
fi
}

function main() {
while true
do chkdb
   sleep 3
done
}
main

4. MySQL数据库备份脚本(mysqldump)

#!/bin/bash
#删除15天以前备份

source /etc/profile           #加载系统环境变量
source ~/.bash_profile    #加载用户环境变量
set -o nounset             #引用未初始化变量时退出
#set -o errexit             #执行shell命令遇到错误时退出

user="root"
password="123456"
host="localhost"
port="3306"
#需备份的数据库，数组
db=("test")
#备份时加锁方式，
#MyISAM为锁表--lock-all-tables，
#InnoDB为锁行--single-transaction
lock="--single-transaction"
mysql_path="/usr/local/mysql"
backup_path="${mysql_path}/backup"
date=$(date +%Y-%m-%d_%H-%M-%S)
day=15
backup_log="${mysql_path}/backup.log"

#建立备份目录
if [ ! -e $backup_path ];then
    mkdir -p $backup_path
fi

#删除以前备份
find $backup_path -type f -mtime +$day -exec rm -rf {} ; > /dev/null 2>&1

echo "开始备份数据库：${db[*]}"

#备份并压缩
backup_sql(){
    dbname=$1
    backup_name="${dbname}_${date}.sql"
    #-R备份存储过程，函数，触发器
    mysqldump -h $host -P $port -u $user -p$password $lock --default-character-set=utf8 --flush-logs -R $dbname > $backup_path/$backup_name    
    if [[ $? == 0 ]];then
        cd $backup_path
        tar zcpvf $backup_name.tar.gz $backup_name
        size=$(du $backup_name.tar.gz -sh | awk '{print $1}')
        rm -rf $backup_name
        echo "$date 备份 $dbname($size) 成功 "
    else
        cd $backup_path
        rm -rf $backup_name
        echo "$date 备份 $dbname 失败 "
    fi
}

#循环备份
length=${#db[@]}
for (( i = 0; i < $length; i++ )); do
        backup_sql ${db[$i]} >> $backup_log 2>&1
done

echo "备份结束,结果查看 $backup_log"
du $backup_path/*$date* -sh | awk '{print "文件:" $2 ",大小:" $1}'