shell 脚本实例--持续更新

1、keepalived检测nginx脚本

#!/bin/bash
# author：gan_ke
# this scripts is used for keepalived to check nginx status

A=`ps -C nginx --no-header |wc -l`   #查看当前是否有nginx 进程     
if [ $A -eq 0 ];then                            
      /usr/local/nginx/sbin/nginx                #重启nginx
      if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then    #nginx重启失败，则停掉keepalived服务，进行VIP转移
              killall keepalived      #强制kill关于keepalived的进程（实现高可用）    
      fi
fi

2、每天定时备份http的访问日志

#!/bin/sh
# author：gan_ke
# this scripts  backup http access_log everyday

cd /var/log/httpd/

##备份日志
/bin/mv access_log access_$(date +%F).log

##重载服务(平滑，不影响业务)
/etc/init.d/httpd reload

这是脚本，完成后还要加入定时任务：

30 5 * * * /bin/sh /scripts/cut_http_log.sh

3、检查系统是否装某个软件，没有则安装

#!/bin/bash
# author: gan_ke
# this script is check the service on your system,if no,then install it

# 使用命令查看是否有包安装上
res=`rpm -qa $1 | wc -l`
if  [ $res -eq  0 ] ; then
    yum install -y $1
else
    echo "$1 is already installed." 
fi

4、在指定目录下，通过5个随机字母+ganke创建10个txt文件

#!/bin/bash
# author:gan_ke
# this script is touch file with random name

#先判断目录是否存在，若不存在则创建目录
[ -d /root/test ] || mkdir /root/test -p

cd /root/test

for i in `seq 10`
do
    touch `echo $RANDOM|md5sum|cut -c 1-5|tr "[0-9]" "[a-z]"`_ganke.txt  
done