Redis+keepalived安装及配置:
1.ip规划：
|
服务器 |
Ip地址 |
VIP |
应用软件 |
|
Redis主 |
192.168.1.102 |
192.168.1.120 |
Redis+ keepalived |
|
Redis备 |
192.168.1.103 |
Redis+ keepalived |
2.服务器基础配置安装
先安装好基础装机环境，具体参考 服务器基础环境配置 文档
redis安装：
1.#下载redies安装包
wget http://download.redis.io/releases/redis-3.2.0.tar.gz tar -xf redis-3.2.0.tar.gz
2.#编译安装
cd redis-3.2.0
make
3.#添加相关文件及命令
mkdir /usr/local/redis/bin/ -p
cd src
cp redis-benchmark redis-check-aof redis-check-rdb redis-cli redis-server redis-sentinel /usr/local/redis/bin/
cd ..
cp redis.conf /etc/
4.#添加启动脚本
echo '#chkconfig: 2345 10 90
#description: Start and Stop redis
REDISPORT=6379
EXEC=/usr/local/redis/bin/redis-server
REDIS_CLI=/usr/local/redis/bin/redis-cli
PIDFILE=/var/run/redis.pid
CONF="/etc/redis.conf"
case "$1" in
start)
if [ -f $PIDFILE ]
then
echo "$PIDFILE exists, process is already running or crashed"
else
echo "Starting Redis server..."
$EXEC $CONF
fi
if [ "$?"="0" ]
then
echo "Redis is running..."
fi
;;
stop)
if [ ! -f $PIDFILE ]
then
echo "$PIDFILE does not exist, process is not running"
else
PID=$(cat $PIDFILE)
echo "Stopping ..."
$REDIS_CLI -p $REDISPORT SHUTDOWN
while [ -x ${PIDFILE} ]
do
echo "Waiting for Redis to shutdown ..."
sleep 1
done
echo "Redis stopped"
fi
;;
restart|force-reload)
${0} stop
${0} start
;;
*)
echo "Usage: /etc/init.d/redis {start|stop|restart|force-reload}" >&2
exit 1
esac
' > /etc/init.d/redis
添加执行权限：
chmod +x /etc/init.d/redis
5.#设置开机自启动
chkconfig --add redis
chkconfig redis on
6.#创建redis状态日志
mkdir /var/log/redis/
touch /var/log/redis/redis.log
Keepalived安装：
1.获取安装包
wget http://www.keepalived.org/software/keepalived-1.2.20.tar.gz
2.解压安装
tar -xf keepalived-1.2.20.tar.gz
cd keepalived-1.2.20
yum -y install openssl openssl-devel
./configure && make && make install
3.文件配置
mkdir /etc/keepalived
mkdir /usr/local/keepalived/scripts/ -p
cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/
cp /usr/local/sbin/keepalived /usr/sbin
cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
4.添加开机自启动
chmod +x /etc/init.d/keepalived
chkconfig --add keepalived
chkconfig keepalived on
以上操作主从都要执行
redis +keepalived配置：
1.配置redis master高可用配置文件：
vim /etc/keepalived/keepalived
! Configuration File for keepalived
global_defs {
router_id redis103
}
vrrp_script chk_redis
{
script "/usr/local/keepalived/scripts/redis_check.sh 127.0.0.1 6379" #监控脚本
interval 2 #监控时间
timeout 2 #超时时间
fall 3
}
vrrp_instance redis {
state BACKUP # master set to SLAVE also
interface eth0
lvs_sync_daemon_interface eth0
virtual_router_id 202
priority 150 #权重值
nopreempt # no seize,must add
advert_int 1
authentication { #all node must same
auth_type PASS #加密
auth_pass 1111 #密码
}
virtual_ipaddress {
192.168.1.120 #VIP
}
track_script {
chk_redis
}
notify_master "/usr/local/keepalived/scripts/redis_master.sh 127.0.0.1 192.168.1.103 6379"
notify_backup "/usr/local/keepalived/scripts/redis_backup.sh 127.0.0.1 192.168.1.103 6379"
notify_fault /usr/local/keepalived/scripts/redis_fault.sh
notify_stop /usr/local/keepalived/scripts/redis_stop.sh
}
2.配置slave高可用配置文件（可从线上拷贝再做修改）
[root@www scripts]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id redis104
}
vrrp_script chk_redis
{
script "/usr/local/keepalived/scripts/redis_check.sh 127.0.0.1 6379" #监控脚本
interval 2 #监控时间
timeout 2 #超时时间
fall 3 #
}
vrrp_instance redis {
state BACKUP #设置为BACKUP
interface eth0 #监控网卡
lvs_sync_daemon_interface eth0 #
virtual_router_id 202
priority 100 #权重值
nopreempt # no seize,must add
advert_int 1
authentication { #all node must same
auth_type PASS #加密
auth_pass 1111 #密码与102的相同
}
virtual_ipaddress {
192.168.1.120 # VIP
}
track_script {
chk_redis
}
notify_master "/usr/local/keepalived/scripts/redis_master.sh 127.0.0.1 192.168.1.102 6379"
notify_backup "/usr/local/keepalived/scripts/redis_backup.sh 127.0.0.1 192.168.1.102 6379"
notify_fault /usr/local/keepalived/scripts/redis_fault.sh
notify_stop /usr/local/keepalived/scripts/redis_stop.sh
}
3.在master和slave上创建监控脚本：
1）.配置master脚本文件（可从线上拷贝再做修改）
脚本目录 /usr/local/keepalived/scripts
以下用于监控Redis的脚本
/usr/local/keepalived/scripts/redis_check.sh
[root@www scripts]# cat redis_check.sh
#!/bin/bash
ALIVE=`/usr/local/redis/bin/redis-cli -h $1 -p $2 PING`
LOGFILE="/var/log/keepalived-redis-check.log"
echo "[CHECK]" >> $LOGFILE
date >> $LOGFILE
if [ $ALIVE == "PONG" ]; then :
echo "Success: redis-cli -h $1 -p $2 PING $ALIVE" >> $LOGFILE 2>&1
exit 0
else
echo "Failed:redis-cli -h $1 -p $2 PING $ALIVE " >> $LOGFILE 2>&1
exit 1
fi
以下负责运作的关键脚本：
notify_master /usr/local/keepalived/scripts/redis_master.sh
notify_backup /usr/local/keepalived/scripts/redis_backup.sh
notify_fault /usr/local/keepalived/scripts/redis_fault.sh
notify_stop /usr/local/keepalived/scripts/redis_stop.sh
因为Keepalived在转换状态时会依照状态来呼叫：
当进入Master状态时会呼叫notify_master
当进入Backup状态时会呼叫notify_backup
当发现异常情况时进入Fault状态呼叫notify_fault
当Keepalived程序终止时则呼叫notify_stop
首先，在Redis Master上创建notity_master与notify_backup脚本：
[root@www scripts]# cat redis_master.sh
#!/bin/bash
REDISCLI="/usr/local/redis/bin/redis-cli -h $1 -p $3"
LOGFILE="/var/log/keepalived-redis-state.log"
echo "[master]" >> $LOGFILE
date >> $LOGFILE
echo "Being master...." >> $LOGFILE 2>&1
echo "Run SLAVEOF cmd ... " >> $LOGFILE
$REDISCLI SLAVEOF $2 $3 >> $LOGFILE 2>&1
#echo "SLAVEOF $2 cmd can't excute ... " >> $LOGFILE
sleep 10 #延迟10秒以后待数据同步完成后再取消同步状态
echo "Run SLAVEOF NO ONE cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF NO ONE >> $LOGFILE 2>&1
[root@www scripts]# cat redis_backup.sh
#!/bin/bash
REDISCLI="/usr/local/redis/bin/redis-cli"
LOGFILE="/var/log/keepalived-redis-state.log"
echo "[BACKUP]" >> $LOGFILE
date >> $LOGFILE
echo "Being slave...." >> $LOGFILE 2>&1
echo "Run SLAVEOF cmd ..." >> $LOGFILE 2>&1
$REDISCLI SLAVEOF $2 $3 >> $LOGFILE
sleep 100 #延迟100秒以后待数据同步完成后再取消同步状态
exit(0)
接着，在Redis Slave上创建notity_master与notify_backup脚本(因为是双主脚本和slave一致)：
然后在Master与
[root@www scripts]# cat redis_fault.sh
#!/bin/bash
LOGFILE="/var/log/keepalived-redis-state.log"
echo "[fault]" >> $LOGFILE
date >> $LOGFILE
[root@www scripts]# cat redis_stop.sh
#!/bin/bash
LOGFILE="/var/log/keepalived-redis-state.log"
echo "[stop]" >> $LOGFILE
date >> $LOGFILE
给脚本都加上可执行权限：
$ sudo chmod +x /etc/keepalived/scripts/*.sh
2).Redis配置文件说明/etc/redis.conf:
参考文档 redis配置文件参数详解
3).设置环境变量：
echo “export PATH=$PATH:/usr/local/redis/bin” >> /root/.bash_profile
source /root/.bash_profile
4).重启服务：
/etc/init.d/keepalived restart
/etc/init.d/redis restart
redis测试：
脚本创建完成以后，我们开始按照如下流程进行测试：
1.启动Master上的Redis
$ /etc/init.d/redis start
2.启动Slave上的Redis
$ /etc/init.d/redis start
3.启动Master上的Keepalived
$ /etc/init.d/keepalived start
4.启动Slave上的Keepalived
$ /etc/init.d/keepalived start
5.尝试通过VIP连接Redis:
$ redis-cli -h 192.168.1.120 INFO
role:master
$ redis-cli -h 192.168.1.102 INFO
role:master
$ redis-cli -h 192.168.1.103 INFO
role:slave
连接成功，Slave也连接上来了。
6.尝试插入一些数据：
$ redis-cli -h 192.168.1.120 SET Hello Redis
OK
从VIP读取数据
$ redis-cli -h 192.168.1.120 GET Hello
"Redis"
从Master读取数据
$ redis-cli -h 192.168.1.102 GET Hello
"Redis"
从Slave读取数据
$ redis-cli -h 192.168.1.103 GET Hello
"Redis"
下面，模拟故障产生：
将Master上的Redis进程杀死：
$ killall -9 redis-server
查看Master上的Keepalived日志
$ tailf /var/log/keepalived-redis-state.log
同时Slave上的日志显示：
$ tailf /var/log/keepalived-redis-state.log
然后我们可以发现，Slave已经接管服务，并且担任Master的角色了。
$ redis-cli -h 192.168.1.120 INFO
$ redis-cli -h 192.168.1.104 INFO
role:master
然后我们恢复Master的Redis进程
$ /etc/init.d/redis start
查看Master上的Keepalived日志
$ tailf /var/log/keepalived-redis-state.log
同时Slave上的日志显示：
$ tailf /var/log/keepalived-redis-state.log