keepalived實現主備切換

wget 

tar -zxvf keepalived-
1.2.18
.tar.gz -c /usr/local
/yum install -y openssl openssl-devel
cd keepalived-
1.2.18/&&
./configure --prefix=/usr/local/keepalived
make && make install

mkdir /etc/keepalived

cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
ln -s /usr/local/sbin/keepalived /usr/sbin/
ln -s /usr/local/keepalived/sbin/keepalived /sbin/

chkconfig keepalived on，

到此我們安裝完畢!

2.寫乙個shell指令碼，用於檢測nginx是否啟動，如果沒有啟動，嘗試重啟，如果還是不行，則關閉keepalived

指令碼例項：

#!/bin/bash

a=`ps -c nginx --no-header | wc -l`
if [ $a
-eq0 ]
then
/usr/local/nginx/sbin/nginx
b=`ps -c nginx --no-header |wc -l`
if [ $b
-eq0 ]
then
killall keepalived
fifi

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