服务状态检查

【检测mysql是否存活】

ping_fail_count=0

for ((i=1;i<=3;i++));

do

check_mysql_active=`$mysqladmin -h$ip -P$port -uuser -p'password' ping 2>&1`

if [ "$check_mysql_active" = "mysqld is alive" ];then

echo "port is active."

break

else

echo "check $i time"

let ping_fail_count++

sleep 2

fi

done

if [ $ping_fail_count -eq 3 ];then

echo "port is not active!"

fi

 

【检测redis是否存活】

ping_fail_count=0

for ((i=1;i<=3;i++));

do

check_redis_active=`redis-cli -h $ip -p $port ping 2>&1`

if [ "$check_redis_active" = "PONG" ];then

echo "port is active."

break

else

echo "check $i time"

let ping_fail_count++

sleep 2

fi

done

if [ $ping_fail_count -eq 3 ];then

echo "port is not active!"

fi

 

【检测命令是否存在】

cmd=$1

command -v $cmd > /dev/null 2>&1 && ret=1 || ret=0

if [ $ret -eq 0 ];then

echo "command is not found"

else

echo "command is exist"

fi

 

【小数比较大小】

num1=$1

num2=$2

c=`echo "$num1"|awk 'BEGIN{FS="."} {print length($2)}'`

d=`echo "$num2"|awk 'BEGIN{FS="."} {print length($2)}'`

if [ $c -ge $d ];then

tmp=$c

else

tmp=$d

fi

temp=1

for ((i = 0; i < $tmp;i ++));

do

temp=${temp}0

done

a1=`echo "$num1*$temp" |bc`

b1=`echo "$num2*$temp" |bc`

c=`echo "$a1"|awk 'BEGIN{FS="."} {print $1}'`

d=`echo "$b1"|awk 'BEGIN{FS="."} {print $1}'`

if [ $c -gt $d ];then

echo "gt"

elif [ $c -eq $d ];then

echo "equal"

else

echo "lt"

fi

 

【去掉数字前面的0,比如去掉000081前面的0000】

a=$1

b=`expr $a + 0`

echo $b

 

 

【判断远程主机上文件是否存在】

#!/bin/bash

ssh_host="root@10.6.35.23"

mycnf="/srv/23.txt"

if ssh $ssh_host test -e $mycnf;then

echo "exist"

else

echo "not exist"

fi

 

【linux shell交互yes or no】

while true; do

read -p "请选择继续或退出(yes|no): " yn

case $yn in

yes ) break;;

no ) exit;;

* ) echo "Please input yes or no";;

esac

done

 

 

【判断IP地址是否合法】

ip=$1

valid_check=$(echo $ip|awk -F. '$1<=255&&$2<=255&&$3<=255&&$4<=255{print "yes"}')

if echo $ip|grep -E "^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$">/dev/null; then

if [ ${valid_check:-no} == "yes" ]; then

echo "$ip"

else

echo "ip $ip not available!"

fi

else

echo "ip format error!"

fi

 

【判断IP是否可以ping通】

#!/bin/bash

ip=$1

ping_fail_count=0

for ((i=1;i<=3;i++));

do

if ping -w 1 -c 1 $ip > /dev/null;then

echo -e "$ip ping is successful."

break

else

echo "ping $i times fail"

let ping_fail_count++

sleep 1

fi

done

if [ $ping_fail_count -eq 3 ];then

echo "$ip ping is failure!"

fi

 

【获取本机ip地址】

#!/bin/bash

get_server_ip()

{

[ -e /etc/os-release ] && centos_version=`cat /etc/os-release|grep VERSION_ID|awk -F"=" '{print $2}'|sed 's/\"//g'`||centos_version=0

cat /proc/net/dev|tail -n +3|grep -v lo|awk -F: '{print $1}' > /tmp/cardlog

cat /tmp/cardlog | while read card

do

if [ $centos_version -eq 7 ];then

server_ip=`ifconfig $card | grep -w "inet"|awk '{print $2}'`

else

server_ip=`ifconfig $card | grep "inet addr" | awk '{ print $2}' | awk -F: '{print $2}'`

fi

if [ -z "$server_ip" ];then

continue

else

echo $server_ip

break

fi

done

}

server_ip=$(get_server_ip)

echo "$server_ip"

====================================或者======================================

#!/bin/bash

IP=`ifconfig eth0 | grep 'inet addr' | sed 's/^.*addr://g'| awk '{print $1}'`

NETMASK=`ifconfig eth0 | grep "inet addr"|sed 's/^.*Mask://g'`

echo "$IP/$NETMASK"

exit