redis主备部署方案
Redis部署方式采用主备的方式，通过keepalived来对外提供虚IP，并实现主备自动切换功能。
主实例A：192.168.20.30
备实例B：192.168.20.232
虚IP：192.168.20.110
正常工作时，虚IP在主实例A上，主实例A上的数据自动同步到备实例B上，当主实例A挂掉之后，备实例B将自动接管虚IP，并将redis转换为主模式，待原主实例A恢复后，A将自动切换成备模式，从B上同步数据，主备角互换，实现融灾备份。
安装部署步骤如下：
1. 安装keepalived
wget /software/keepalived-1.2.
tarzxvf keepalived-1.2.
cd keepalived-1.2.6
./configure
如果报错
configure: error:
!!! OpenSSL is not properly installed on your system. !!!
!!! Can not include OpenSSL headers files.
解决办法：
yum -y install openssl-devel
yum -y install popt-devel
ln -s /usr/src/kernels/2.6.32-220.el6.x86_64/ /usr/src/linux
./configure
make
redis docmake install
cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/sbin/keepalived /usr/sbin/
mkdir /etc/keepalived
添加keepalived的配置项：
vi /etc/f
global_defs {
router_id LVS_DEVEL
}
vrrp_scriptMonitor_Redis {
script "/home/bbcv/redis/redis_keepalive.sh"
interval 3 #每3秒执行一次
weight 2
}
# VIP1
vrrp_instance VI_1 {
state BACKUP #主备服务器都设置成BACKUP
interfaceeth0
virtual_router_id55
priority 100 # 备份服务上将100改为90
advert_int 1 #检查间隔
nopreempt #设置为不抢占，注意这个配置只能设置在state为BACKUP的主机上，而且这个主机的priority必须比另外一台高
authentication {
auth_type PASS
auth_pass 1111
}
notify_master/home/bbcv/redis/redis_master.sh
notify_backup/home/bbcv/redis/redis_backup.sh
track_script {
Monitor_Redis #(调用redis进程检测脚本)
}
virtual_ipaddress {
192.168.20.110
#(如果有多个VIP，继续换行填写.)
}
}
启动keepalived
servicekeepalived start
2. redis_keepalive.sh脚本
该脚本主要实现对redis进程进行监控，当检测到redis进程挂掉时，自动停止keepalived进程，使虚IP进行漂移
✧ 注意添加该脚本的可执行权限！
chmod +x redis_keepalive.sh
#!/bin/bash
time=$(date '+%Y-%m-%d %H:%M:%S' )
#redis部署路径
redispath=/home/bbcv/redis
#redis-cli部署路径
rediscli=$redispath/redis-2.0.0-rc4/redis-cli
if [ ! -d "logs" ]; then
mkdir $redispath/logs
fi
logfile=$redispath/logs/redis-state.log
oldfile=$logfile'.'$(date +%Y-%m-%d --date='30 days ago')
yesterdayfile=$logfile'.'$(date +%Y-%m-%d --date='1 days ago')
#把昨天的日志重命名
if [ -f $yesterdayfile ]
then
echo "OK"
else
mv $logfile $yesterdayfile>> $logfile 2>&1
echo "$time [$yesterdayfile] Move yesterdayfile Success!" >> $logfile
fi
#删除老的日志文件
if [ -f $oldfile ]
then
rm -f $oldfile>> $logfile 2>&1
echo "$time [$oldfile] Delete Old File Success!" >> $logfile
else
echo "no old file"
fi
#检测redis端口是否正常
status=`$rediscli -h 127.0.0.1 -p 6379 info|greprole|awk -F ":" '{print $2}'`
$rediscli -h 127.0.0.1 -p 6379 info > /dev/null
if [ $? -eq0 ]; then
echo "$time redis server is OK" >>$logfile
echo 目前状态为:$status >>$logfile
else
echo "$time no redis service found!">>$logfile
sleep 2
# try to found it again
$rediscli -h 127.0.0.1 -p 6379 info > /dev/null
if [ $? -eq0 ]; then
echo "$time redis server is OK" >>$logfile
echo 目前状态为:$status >>$logfile
#exit 0
else
echo "$time redis server error" >>$logfile
#stop keepalived
/etc/init.d/keepalived stop
echo "$time stop keepalived" >>$logfile
fi
fi
3. redis_master.sh脚本
该脚本主要实现当keepalived切换到master时，执行slaveof no one语句把redis的端口转换为主模式
✧ 注意添加该脚本的可执行权限！
chmod +x redis_master.sh
#!/bin/sh
#本机IP地址
localip=127.0.0.1
#另一台服务器的地址
backip=192.168.20.232
#redis端口号
port="6379 9998 11111 14948"
time=$(date '+%Y-%m-%d %H:%M:%S' )
#redis部署路径
redispath=/home/bbcv/redis
#redis-cli部署路径
rediscli=$redispath/redis-2.0.0-rc4/redis-cli
#日志文件目录
logfile=$redispath/logs/redis-state.log
for p in $port
do
{
echo "$time redis $p端口切换成主端口" >>$logfile
$rediscli -h $localip -p $p slaveof no one>>$logfile 2>&1
sleep 1
}
done
4. redis_backup.sh
该脚本主要实现当keepalived切换到master时，执行slaveof 主redisIP 端口 语句，把redis的端口转换为备模式，并同步主redis的数据
✧ 注意添加该脚本的可执行权限！
chmod +x redis_backup.sh
#!/bin/sh
#本机IP地址
localip=127.0.0.1
#另一台服务器的地址
backip=192.168.20.232
#redis端口号
port="6379 9998 11111 14948"
time=$(date '+%Y-%m-%d %H:%M:%S' )
#redis部署路径
redispath=/home/bbcv/redis
#redis-cli部署路径
rediscli=$redispath/redis-2.0.0-rc4/redis-cli
#日志文件目录
logfile=$redispath/logs/redis-state.log
for p in $port
do
{
echo "$time redis $p端口切换成$backip的备端口" >>$logfile
$rediscli -h $localip -p $p slaveof $backip $p>>$logfile 2>&1
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