实用Shell脚本

#!/bin/bash

#memory use

mem_war_file=/tmp/mem_war.txt

mem_use=`free -m | grep Mem | awk '{print $3}'`

mem_total=`free -m | grep Mem | awk '{print $2}'`

mem_percent=$((mem_use*100/mem_total))

# echo "$mem_percent"%

if (($mem_percent > 80));then

   echo "`date +%F-%H-%M` mem: ${mem_percent}%" >$mem_war_file

   echo "`date +%F-%H-%M` mem: ${mem_percent}%" | mail -s "mem warning" root 

fi

#!/bin/bash

#######################################################

#检测网卡流量，并按规定格式记录在日志中

#规定一分钟记录一次

#日志格式如下所示:

#2021-07-08 18:55

#eth0 input: 1234bps

#eth0 output: 1235bps

######################################################3

while :

do

#设置语言为英文，保障输出结果是英文，否则会出现bug

LANG=en

logfile=/tmp/`date +%d`.log

#将下面执行的命令结果输出重定向到logfile日志中

exec >> $logfile

date +"%F %H:%M"

#sar命令统计的流量单位为kb/s，日志格式为bps，因此要*1000*8

sar -n DEV 1 59|grep Average|grep eth0|awk '{print $2,"\t","input:","\t",$5*1000*8,"bps","\n",$2,"\t","output:","\t",$6*1000*8,"bps"}'

echo "####################"

#因为执行sar命令需要59秒，因此不需要sleep

done

#场景：

#1.访问日志文件的路径：/data/log/access.log

#2.脚本死循环，每10秒检测一次，10秒的日志条数为300条，出现502的比例不低于10%（30条）则需要重启php-fpm服务

#3.重启命令为：/etc/init.d/php-fpm restart

#!/bin/bash

###########################################################

#监测Nginx访问日志502情况，并做相应操作

###########################################################

log=/data/log/access.log

N=30 #设定阈值

while :

do

 #查看访问日志的最新300条，并统计502的次数

    err=`tail -n 300 $log |grep -c '502" '`

 if [ $err -ge $N ]

 then

 /etc/init.d/php-fpm restart 2> /dev/null

 #设定60s延迟防止脚本bug导致无限重启php-fpm服务

     sleep 60

 fi

 sleep 10

done

#!/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

#!/bin/bash

#####################################

#检测两台服务器指定目录下的文件一致性

#####################################

#通过对比两台服务器上文件的md5值，达到检测一致性的目的

dir=/data/web

b_ip=192.168.88.10

#将指定目录下的文件全部遍历出来并作为md5sum命令的参数，进而得到所有文件的md5值，并写入到指定文件中

find $dir -type f|xargs md5sum > /tmp/md5_a.txt

ssh $b_ip "find $dir -type f|xargs md5sum > /tmp/md5_b.txt"

scp $b_ip:/tmp/md5_b.txt /tmp

#将文件名作为遍历对象进行一一比对

for f in `awk '{print 2} /tmp/md5_a.txt'`

do

#以a机器为标准，当b机器不存在遍历对象中的文件时直接输出不存在的结果

if grep -qw "$f" /tmp/md5_b.txt

then

md5_a=`grep -w "$f" /tmp/md5_a.txt|awk '{print 1}'`

md5_b=`grep -w "$f" /tmp/md5_b.txt|awk '{print 1}'`

#当文件存在时，如果md5值不一致则输出文件改变的结果

if [ $md5_a != $md5_b ]

then

echo "$f changed."

fi

else

echo "$f deleted."

fi

done

#!/bin/bash

################################################################

#每小时执行一次脚本（任务计划），当时间为0点或12点时，将目标目录下的所有文件内容清空，但不删除文件，其他时间则只统计各个文件的大小，一个文件一行，输出到以时间和日期命名的文件中，需要考虑目标目录下二级、三级等子目录的文件

################################################################

logfile=/tmp/`date +%H-%F`.log

n=`date +%H`

if [ $n -eq 00 ] || [ $n -eq 12 ]

then

#通过for循环，以find命令作为遍历条件，将目标目录下的所有文件进行遍历并做相应操作

for i in `find /data/log/ -type f`

do

true > $i

done

else

for i in `find /data/log/ -type f`

do

du -sh $i >> $logfile

done

fi

#!/usr/bin/bash

# check host status

for i in {1..254}

do

        {

    ip=192.168.8.$i

    ping -c 2 -W 1 $ip &>/dev/null

    if [ $? -eq 0 ];then

        echo "$ip is online" | tee -a /tmp/host_online.txt

    else

       # echo "$ip is offline" | tee -a /tmp/host_offline.txt

       echo "$ip is offline" &>/dev/null

    fi

        }&

done

wait

#!/usr/bin/bash

# ssh keygen

>ip_ok.txt

>ip_false.txt

user=root

passwd=123456

rpm -qa | grep expect &>/dev/null

if [ $? -ne 0 ];then

  echo "expect is not install"

  yum -y install expect

fi

if [ ! -f ~/.ssh/id_rsa ];then

  ssh-keygen -P "" -f ~/.ssh/id_rsa

fi

for i in {15..30}

do

  {

  ip=192.168.1."$i"

  ping -c 1 -W1 "$ip"

  if [ $? -eq 0 ];then

     echo "$ip" >> ip_ok.txt

     /usr/bin/expect <<-EOF

     spawn ssh-copy-id $user@$ip

     expect {

        "yes/no" { send "yes\r"; exp_continue }

        "password:" { send "$passwd\r" };

     }

     expect eof

        EOF

  else

    echo "$ip" >>ip_false.txt

  fi

  }&

done

wait

echo "finish"

#!/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

#!/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

#!/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}'