案例一:
监控web站点目录（/var/html/www）下所有文件是否被恶意篡改（文件内容被改了），如果有就打印改动的文件名（发邮件），定时任务每3分钟执行一次
监控脚本内容:
[root@nfs01 scripts]# cat web-file.sh
#!/bin/bash
##############################################################
# File Name: web-file.sh
# Version: V1.0
# Author: da ya
# Organization: 12345@qq.com
# Created Time : 2018
# Description:
##############################################################
Email='155555@163.com'
Find_file='find /tmp/ -type f'
Dir='/opt/web_file.log'
Old_file=(`cat $Dir|sed -r 's#[a-Z,0-9]+ (.*)#\1#g'|paste -s`)
New_file=(`$Find_file|paste -s`)
function check_md5(){
if [ ! -f "$Dir" ];then
md5sum $Find_file >>$Dir
else
md5sum -c "$Dir" >/opt/check.log 2>&1
if [ $? -ne 0 ];then
mail -s 'Html modify' $Email </opt/check.log
fi
fi
}
function check_file(){
if [ "${#Old_file[*]}" != "${#New_file[*]}" ];then
echo "$New_file"|mail -s "Html modify" $Email
fi
}
function main(){
check_md5
check_file
}
main案例二:
编写rsync的服务管理脚本
脚本内容:
#!/bin/bash
##############################################################
# File Name: web-file.sh
# Version: V1.0
# Author: da ya
# Organization: 12345@qq.com
# Created Time : 2018
# Description:
##############################################################
. /etc/init.d/functions
if [ ! -f /etc/rsyncd.conf ];then
action 'rsyncd.conf not exists' /bin/false
exit
fi
start_cmd='rsync --daemon'
stop_cmd='pkill rsync'
port_cmd=`ss -tunlp|grep 873|wc -l`
START() {
if [ "$port_cmd" -eq 2 ];then
action 'rsync service is already exists' /bin/true
exit
else
$start_cmd
action 'rsync started' /bin/true
fi
}
STOP() {
$stop_cmd
action 'rsync is stoped' /bin/true
}
RESTART() {
$stop_cmd
action 'rsync is stoped' /bin/true
sleep 1
$start_cmd
action 'rsync is started' /bin/true
}
case $1 in
start)
START
;;
stop)
STOP
;;
restart)
RESTART
;;
esac案例三:
监控memcache服务是否正常，模拟用户（web客户端）检测。
使用nc命令加上set/get来模拟检测，以及监控响应时间及命中率。
脚本内容:
#!/bin/bash
##############################################################
# File Name: memcache.sh
# Version: V1.0
# Author: da ya
# Organization: 12345@qq.com
# Created Time : 2018
# Description:
##############################################################
. /etc/init.d/functions
date_cmd=`date +%F-%s`
port_cmd=`nmap 172.16.1.21 -p 11211|awk 'NR==6{print $2}'`
set_cmd=`printf "set key009 0 10 10\r\njiang12345\r\n"|nc 172.16.1.21 11211`
get_cmd=`printf "get key009 \r\n"|nc 172.16.1.21 11211|tr -d '\r'|awk 'NR==2{print $1}'`
restart_cmd=`systemctl restart memcached.service`
if [ "$port_cmd" != "cloesd" ];then
if [ "$get_cmd" != "jiang12345" ];then
action 'memcache get key is successfull' /bin/true
fi
else
$restart_cmd
fi案例四:
编写nginx服务管理脚本,并监控web服务是否正常
管理服务脚本:
#!/bin/bash ############################################################## # File Name: nginx.sh # Version: V1.0 # Author: da ya # Organization: 12345@qq.com # Created Time : 2018 # Description: ############################################################## . /etc/init.d/functions start_cmd='/application/nginx/sbin/nginx' stop_cmd='pkill nginx' restart_cmd='/application/nginx/sbin/nginx -s reload' if [ $# -ne 1 ];then echo "please input $0 start|stop|restart" exit fi case $1 in 1|start|START) $start_cmd action 'nginx started' /bin/true ;; stop|STOP) $stop_cmd action 'nginx stoped' /bin/true ;; restart|RESTART) $restart_cmd action 'nginx restarted' /bin/true ;; esac
监控web服务脚本:
#!/bin/bash
##############################################################
# File Name: monitor.sh
# Version: V1.0
# Author: da ya
# Organization: 12345@qq.com
# Created Time : 2018
# Description:
##############################################################
start_cmd='/application/nginx/sbin/nginx'
stop_cmd='pkill nginx'
port_cmd=`ss -tunlp|grep 80|wc -l`
curl_cmd=`curl -s -I 10.0.0.31 -w "%{http_code}\n" -o /dev/null`
if [ "$port_cmd" -ne 1 ];then
$stop_cmd
sleep 2
$start_cmd
if [ "$curl_cmd" -ne 200 ];then
echo "$curl_cmd"|mail -s "web service failed" 155555@163.com
fi
fi案例四:
实现对MySQL数据库进行分库备份
脚本内容:
#!/bin/bash
##############################################################
# File Name: mysql.sh
# Version: V1.0
# Author: da ya
# Organization: 12345@qq.com
# Created Time : 2018
# Description:
##############################################################
. /etc/init.d/functions
BakDir=/tmp/mysql-bak/
DataBase=/tmp/mysql_database.txt
function service_mysql(){
Port=`ss -tunlp|grep 3306|wc -l`
if [ "$Port" -ne 1 ];then
echo 'Please starting Mysql-service'
exit
fi
if [ ! -d "$BakDir" ];then
mkdir -p $BakDir
fi
}
function bak(){
mysql -uroot -p123456 -e "show databases;"|awk '!/[A-Z]+/' >$DataBase
while read i
do
mysqldump -uroot -p123456 -B $i >${BakDir}/bak_${i}.sql
if [ $? -eq 0 ];then
action "Mysql-bak $i is successfully" /bin/true
else
action "Mysql-bak $i is failed" /bin/false
fi
done < $DataBase
}
function main(){
service_mysql
bak
}
main案例五:
利用for循环打印下面字符串中字母数小于6的单词
Who did you pass by today Who passed you
脚本内容:
#!/bin/bash
for i in Who did you pass by today Who passed you
do
if [ "${#i}" -gt 6 ];then
echo $i:${#i}
else
continue
fi
done案例六:
批量创建多个账号并生成随机密码,创建成功后要求账号名称和对应密码记录到文件中
脚本内容:
案例七:
[LVS主节点]手工开发ipvsadm管理lvs的脚本ip_vs
实现:/etc/init.d/lvs {start|stop|restart}
脚本内容:
#!/bin/bash
##############################################################
# File Name: lvs.sh
# Version: V1.0
# Author: da ya
# Organization: 12345@qq.com
# Created Time : 2018-03-24 00:47:17
# Description:
##############################################################
. /etc/init.d/functions
ip_cmd=`ip addr show eth0|grep 10.0.0.13|wc -l`
START() {
if [ "$ip_cmd" -eq 0 ];then
ip addr add 10.0.0.13/24 dev eth0
ipvsadm -C
ipvsadm --set 30 5 60
ipvsadm -A -t 10.0.0.13:80 -s wrr -p 20
ipvsadm -a -t 10.0.0.13:80 -r 10.0.0.17:80 -g -w 1
ipvsadm -a -t 10.0.0.13:80 -r 10.0.0.18:80 -g -w 1
action 'LVS is started' /bin/true
else
action 'LVS is already exists' /bin/true
fi
}
STOP() {
ipvsadm -C
ip addr del 10.0.0.13/24 dev eth0
action 'LVS is stoped' /bin/true
}
RESTART() {
ipvsadm -C
ip addr del 10.0.0.13/24 dev eth0
action 'LVS is stoped' /bin/true
ip addr add 10.0.0.13/24 dev eth0
ipvsadm --set 30 5 60
ipvsadm -A -t 10.0.0.13:80 -s wrr -p 20
ipvsadm -a -t 10.0.0.13:80 -r 10.0.0.17:80 -g -w 1
ipvsadm -a -t 10.0.0.13:80 -r 10.0.0.18:80 -g -w 1
action 'LVS is restarted' /bintrue
}
case $1 in
start)
START
;;
stop)
STOP
;;
restart)
RESTART
;;
*)
echo 'Usage: input { start|stop|restart }'
;;
esac
