21：开发脚本管理服务端LVS案例

[root@lb03 scripts]# cat lv_manager.sh
#!/bin/bash

#定义只能是root用户执行
if [ $UID -ne 0 ];then
    echo "permission deny  必须root用户执行"
    exit

fi
#文件存在就加载文件
[ -f /etc/init.d/functions ] && . /etc/init.d/functions

#定义绑定的虚拟ip

vip_netmask=10.0.0.13/24

vip=10.0.0.3

service_addr=10.0.0.13:80
wbs=(
10.0.0.17:80
10.0.0.18:80
)

count_pkg=$(rpm -qa|egrep ipvsadm|wc -l)

function start () {
    #检查虚拟IP个数,IP检测和ipvsadm -ln两种方法检查
    count_vip_check=$(ip a|grep 10.0.0.1[3]|wc -l)
    count_vip_check2=$(ipvsadm -ln|grep "10.0.0.1[3]:80"|wc -l)
    if [ ${count_vip_check} -eq 1 -o ${count_vip_check2} -eq 1  ]
    then
        echo "${count_vip_check} 虚拟IP已经存在"
    else
        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 
    fi
    #管理工具ipvsadm不存在就安装
    [ ${count_pkg} -eq 0 ] && yum install ipvsadm -y 2>/dev/null

    #先检查一下网址通不通
    for  i in ${wbs[@]}
    do

        web_code=$(curl -o /dev/null  -w "%{http_code}" -s  $i)
        if [ "${web_code}" == "200" ]
        then
            echo "${i} is ok"
             ipvsadm -a -t 10.0.0.13:80 -r $i -g -w 1

        else
            echo "添加的服务 ${i} 没有打开" 

        fi        

    done



}

stop () {

    count_vip_check=$(ip a|grep 10.0.0.1[3]|wc -l)
    if [ ${count_vip_check} -eq 0 ]
    then

        echo "虚拟IP 不存在"
        exit 11
    else
        ip addr del 10.0.0.13/24 dev eth0
        ipvsadm -C                    
    fi 

}



case "$1" in 

start)

    start
    ;;

stop)

    stop
    ;;

restart)

    stop
    sleep 2
    start
    ;;

*)
    echo "Usage {start|stop|restart}" 
;;

esac

================================

下面是改过的比上面好

[root@lb04 scripts]# cat lv_manager.sh 
#!/bin/bash

#定义只能是root用户执行
if [ $UID -ne 0 ];then
    echo "permission deny  必须root用户执行"
    exit

fi
#文件存在就加载文件
[ -f /etc/init.d/functions ] && . /etc/init.d/functions

#定义绑定的虚拟ip

vip_netmask=10.0.0.13/24


service_addr=10.0.0.13:80
wbs=(
10.0.0.17:80
10.0.0.18:80
)

count_pkg=$(rpm -qa|egrep ipvsadm|wc -l)

function start () {
    #检查虚拟IP个数,IP检测和ipvsadm -ln两种方法检查
    count_vip_check=$(ip a|grep 10.0.0.1[3]|wc -l)
    count_vip_check2=$(ipvsadm -ln|grep "10.0.0.1[3]:80"|wc -l)
    if [ ${count_vip_check} -eq 1 -o ${count_vip_check2} -eq 1  ]
    then
        echo "${count_vip_check} 本地虚拟IP已经存在,将退出" && exit 22
    else
        check_count=$(nmap 10.0.0.13|grep "Host is up"|wc -l)
        [ ${check_count} -gt 0 ] && echo "远端 13 ip开启,将退出" && exit 11
        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 
    fi
    #管理工具ipvsadm不存在就安装
    [ ${count_pkg} -eq 0 ] && yum install ipvsadm -y 2>/dev/null

    #先检查一下网址通不通
    for  i in ${wbs[@]}
    do

        web_code=$(curl -o /dev/null  -w "%{http_code}" -s  $i)
        if [ "${web_code}" == "200" ]
        then
            echo "${i} is ok"
             ipvsadm -a -t 10.0.0.13:80 -r $i -g -w 1

        else
            echo "添加的服务 ${i} 没有打开" 

        fi        

    done



}

stop () {

    count_vip_check=$(ip a|grep 10.0.0.1[3]|wc -l)
    if [ ${count_vip_check} -eq 0 ]
    then

        echo "虚拟IP 不存在"
        exit 11
    else
        ip addr del 10.0.0.13/24 dev eth0
        ipvsadm -C                    
    fi 

}



case "$1" in 

start)

    start
    ;;

stop)

    stop
    ;;

restart)

    stop
    sleep 2
    start
    ;;

*)
    echo "Usage {start|stop|restart}" 
;;

esac