Redis + Keepalived实现Redis的HA：
2016-06-22 11:41
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Redis + Keepalived实现Redis的HA：
环境介绍：
OS：CentOS 6.5
192.168.1.41 redis1 master
192.168.1.42 redis2 slave
VIP: 192.168.1.40
设计思路：
当 Master 与 Slave 均运作正常时, Master负责服务，Slave负责Standby；
当 Master 挂掉，Slave 正常时, Slave接管服务，同时关闭主从复制功能；
当 Master 恢复正常，则从Slave同步数据，同步数据之后关闭主从复制功能，
恢复Master身份，于此同时Slave等待Master同步数据完成之后，恢复Slave身份。
然后依次循环。
需要注意的是，这样做需要在Master与Slave上都开启本地化策略，否则在互相自动切换的过程中，
未开启本地化的一方会将另一方的数据清空，造成数据完全丢失.
1：在Master和Slave上安装、启动Redis
[root@redis1 ~]# cd /opt
[root@redis1 ~]# wget http://download.redis.io/releases/redis-2.8.12.tar.gz
[root@redis1 ~]# tar -zxvf redis-2.8.12.tar.gz
[root@redis1 ~]# cd redis-2.8.12
[root@redis1 ~]# make
如有编译报错，可以加上参数编译 make CFLAGS="-march=i686"
启动并运行redis：
[root@redis1 ~]# /opt/redis-2.8.12/src/redis-server &
[1] 1946
[root@redis1 ~]# [1946] 21 Jun 09:14:12.312 # Warning: no config file specified, using the default config. In order to specify a config file use /opt/redis-2.8.12/src/redis-server /path/to/redis.conf
[1946] 21 Jun 09:14:12.313 * Increased maximum number of open files to 10032 (it was originally set to 1024).
_._
_.-``__ ''-._
_.-`` `. `_. ''-._ Redis 2.8.12 (00000000/0) 64 bit
.-`` .-```. ```\/ _.,_ ''-._
( ' , .-` | `, ) Running in stand alone mode
|`-._`-...-` __...-.``-._|'` _.-'| Port: 6379
| `-._ `._ / _.-' | PID: 1946
`-._ `-._ `-./ _.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' | http://redis.io
`-._ `-._`-.__.-'_.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' |
`-._ `-._`-.__.-'_.-' _.-'
`-._ `-.__.-' _.-'
`-._ _.-'
`-.__.-'
[1946] 21 Jun 09:14:12.318 # Server started, Redis version 2.8.12
[1946] 21 Jun 09:14:12.318 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1'
for this to take effect.
[1946] 21 Jun 09:14:12.318 * The server is now ready to accept connections on port 6379
打开另外一个终端运行redis客户端：
[root@redis1 ~]# /opt/redis-2.8.12/src/redis-cli
127.0.0.1:6379> set name zhang
OK
127.0.0.1:6379> get name
"zhang"
2：安装配置keepalived
在master、slave安装keepalived：
[root@redis1 ~]# yum -y install keepalived
在Master上创建如下配置文件：
[root@redis1 ~]# vi /etc/keepalived/keepalived.conf
vrrp_script chk_redis {
script "/etc/keepalived/scripts/redis_check.sh" ###监控脚本
interval 2 ###监控时间
}
vrrp_instance VI_1 {
state MASTER ###设置为MASTER
interface eth1 ###监控网卡
virtual_router_id 51
priority 101 ###权重值
authentication {
auth_type PASS ###加密
auth_pass redis ###密码
}
track_script {
chk_redis ###执行上面定义的chk_redis
}
virtual_ipaddress {
192.168.1.40 ###VIP
}
notify_master /etc/keepalived/scripts/redis_master.sh
notify_backup /etc/keepalived/scripts/redis_backup.sh
notify_fault /etc/keepalived/scripts/redis_fault.sh
notify_stop /etc/keepalived/scripts/redis_stop.sh
}
在Slave上创建如下配置文件：
vi /etc/keepalived/keepalived.conf
vrrp_script chk_redis {
script "/etc/keepalived/scripts/redis_check.sh" ###监控脚本
interval 2 ###监控时间
}
vrrp_instance VI_1 {
state BACKUP ###设置为BACKUP
interface eth1 ###监控网卡
virtual_router_id 51
priority 100 ###比MASTRE权重值低
authentication {
auth_type PASS
auth_pass redis ###密码与MASTRE相同
}
track_script {
chk_redis ###执行上面定义的chk_redis
}
virtual_ipaddress {
192.168.1.40 ###VIP
}
notify_master /etc/keepalived/scripts/redis_master.sh
notify_backup /etc/keepalived/scripts/redis_backup.sh
notify_fault /etc/keepalived/scripts/redis_fault.sh
notify_stop /etc/keepalived/scripts/redis_stop.sh
}
在Master和Slave上创建监控Redis的脚本：
mkdir /etc/keepalived/scripts
vi /etc/keepalived/scripts/redis_check.sh
#!/bin/bash
ALIVE=`/opt/redis-2.8.12/src/redis-cli ping`
if [ "$ALIVE" == "PONG" ]; then
echo $ALIVE
exit 0
else
echo $ALIVE
exit 1
fi
编写以下负责运作的关键脚本：
notify_master /etc/keepalived/scripts/redis_master.sh
notify_backup /etc/keepalived/scripts/redis_backup.sh
notify_fault /etc/keepalived/scripts/redis_fault.sh
notify_stop /etc/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：
vi /etc/keepalived/scripts/redis_master.sh
#!/bin/bash
REDISCLI="/opt/redis-2.8.12/src/redis-cli"
LOGFILE="/opt/redis-2.8.12/log/keepalived-redis-state.log"
echo "[master]" >> $LOGFILE
date >> $LOGFILE
echo "Being master...." >> $LOGFILE 2>&1
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF 192.168.1.42 6379 >> $LOGFILE 2>&1
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
vi /etc/keepalived/scripts/redis_backup.sh
#!/bin/bash
REDISCLI="/opt/redis-2.8.12/src/redis-cli"
LOGFILE="/opt/redis-2.8.12/log/keepalived-redis-state.log"
echo "[backup]" >> $LOGFILE
date >> $LOGFILE
echo "Being slave...." >> $LOGFILE 2>&1
sleep 15 #延迟15秒待数据被对方同步完成之后再切换主从角色
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF 192.168.1.42 6379 >> $LOGFILE 2>&1
接着，在Redis Slave上创建notity_master与notify_backup脚本：
vi /etc/keepalived/scripts/redis_master.sh
#!/bin/bash
REDISCLI="/opt/redis-2.8.12/src/redis-cli"
LOGFILE="/opt/redis-2.8.12/log/keepalived-redis-state.log"
echo "[master]" >> $LOGFILE
date >> $LOGFILE
echo "Being master...." >> $LOGFILE 2>&1
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF 192.168.1.41 6379 >> $LOGFILE 2>&1
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
vi /etc/keepalived/scripts/redis_backup.sh
#!/bin/bash
REDISCLI="/opt/redis-2.8.12/src/redis-cli"
LOGFILE="/opt/redis-2.8.12/log/keepalived-redis-state.log"
echo "[backup]" >> $LOGFILE
date >> $LOGFILE
echo "Being slave...." >> $LOGFILE 2>&1
sleep 15 #延迟15秒待数据被对方同步完成之后再切换主从角色
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF 192.168.1.41 6379 >> $LOGFILE 2>&1
然后在Master与Slave创建如下相同的脚本：
vi /etc/keepalived/scripts/redis_fault.sh
#!/bin/bash
LOGFILE=/opt/redis-2.8.12/log/keepalived-redis-state.log
echo "[fault]" >> $LOGFILE
date >> $LOGFILE
vi /etc/keepalived/scripts/redis_stop.sh
#!/bin/bash
LOGFILE=/opt/redis-2.8.12/log/keepalived-redis-state.log
echo "[stop]" >> $LOGFILE
date >> $LOGFILE
给脚本都加上可执行权限：
chmod +x /etc/keepalived/scripts/*.sh
1.启动Master上的Redis
[root@redis1 log]# /opt/redis-2.8.12/src/redis-server &
2.启动Slave上的Redis
[root@redis2 log]# /opt/redis-2.8.12/src/redis-server &
3.启动Master上的Keepalived
[root@redis1 log]# /etc/init.d/keepalived start
4.启动Slave上的Keepalived
[root@redis2 log]# /etc/init.d/keepalived start
5.尝试通过VIP连接Redis:
/opt/redis-2.8.12/src/redis-cli -h 192.168.1.40 INFO
连接成功，Slave也连接上来了。
# Replication
role:master
connected_slaves:1
slave0:ip=192.168.1.42,port=6379,state=online,offset=156,lag=1
6.尝试插入一些数据：
/opt/redis-2.8.12/src/redis-cli -h 192.168.1.40 SET Hello Redis
OK
从VIP读取数据
/opt/redis-2.8.12/src/redis-cli -h 192.168.1.40 GET Hello
"Redis"
从Master读取数据
/opt/redis-2.8.12/src/redis-cli -h 192.168.1.41 GET Hello
"Redis"
从Slave读取数据
/opt/redis-2.8.12/src/redis-cli -h 192.168.1.42 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
tail f /opt/redis-2.8.12/log/keepalived-redis-state.log
[fault]
Thu Sep 27 08:29:01 CST 2012
同时Slave上的日志显示：
tail -80 /opt/redis-2.8.12/log/keepalived-redis-state.log
[master]
Fri Sep 28 14:14:09 CST 2012
Being master....
Run SLAVEOF cmd ...
OK
Run SLAVEOF NO ONE cmd ...
OK
然后可以发现，Slave已经接管服务，并且担任Master的角色了。
/opt/redis-2.8.12/src/redis-cli -h 192.168.1.40 INFO
/opt/redis-2.8.12/src/redis-cli -h 192.168.1.42 INFO
role:master
然后恢复Master的Redis进程
/opt/redis-2.8.12/src/redis-server &
查看Master上的Keepalived日志
tail -80 /opt/redis-2.8.12/log/keepalived-redis-state.log
[master]
Thu Sep 27 08:31:33 CST 2012
Being master....
Run SLAVEOF cmd ...
OK
Run SLAVEOF NO ONE cmd ...
OK
同时Slave上的日志显示：
tail -80 /opt/redis-2.8.12/log/keepalived-redis-state.log
[backup]
Fri Sep 28 14:16:37 CST 2012
Being slave....
Run SLAVEOF cmd ...
OK
可以发现目前的Master已经再次恢复了Master的角色，故障切换以及自动恢复都成功了。
参考文档：
http://blog.csdn.net/huwei2003/article/details/41894197
环境介绍：
OS：CentOS 6.5
192.168.1.41 redis1 master
192.168.1.42 redis2 slave
VIP: 192.168.1.40
设计思路：
当 Master 与 Slave 均运作正常时, Master负责服务，Slave负责Standby；
当 Master 挂掉，Slave 正常时, Slave接管服务，同时关闭主从复制功能；
当 Master 恢复正常，则从Slave同步数据，同步数据之后关闭主从复制功能，
恢复Master身份，于此同时Slave等待Master同步数据完成之后，恢复Slave身份。
然后依次循环。
需要注意的是，这样做需要在Master与Slave上都开启本地化策略，否则在互相自动切换的过程中，
未开启本地化的一方会将另一方的数据清空，造成数据完全丢失.
1：在Master和Slave上安装、启动Redis
[root@redis1 ~]# cd /opt
[root@redis1 ~]# wget http://download.redis.io/releases/redis-2.8.12.tar.gz
[root@redis1 ~]# tar -zxvf redis-2.8.12.tar.gz
[root@redis1 ~]# cd redis-2.8.12
[root@redis1 ~]# make
如有编译报错，可以加上参数编译 make CFLAGS="-march=i686"
启动并运行redis：
[root@redis1 ~]# /opt/redis-2.8.12/src/redis-server &
[1] 1946
[root@redis1 ~]# [1946] 21 Jun 09:14:12.312 # Warning: no config file specified, using the default config. In order to specify a config file use /opt/redis-2.8.12/src/redis-server /path/to/redis.conf
[1946] 21 Jun 09:14:12.313 * Increased maximum number of open files to 10032 (it was originally set to 1024).
_._
_.-``__ ''-._
_.-`` `. `_. ''-._ Redis 2.8.12 (00000000/0) 64 bit
.-`` .-```. ```\/ _.,_ ''-._
( ' , .-` | `, ) Running in stand alone mode
|`-._`-...-` __...-.``-._|'` _.-'| Port: 6379
| `-._ `._ / _.-' | PID: 1946
`-._ `-._ `-./ _.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' | http://redis.io
`-._ `-._`-.__.-'_.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' |
`-._ `-._`-.__.-'_.-' _.-'
`-._ `-.__.-' _.-'
`-._ _.-'
`-.__.-'
[1946] 21 Jun 09:14:12.318 # Server started, Redis version 2.8.12
[1946] 21 Jun 09:14:12.318 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1'
for this to take effect.
[1946] 21 Jun 09:14:12.318 * The server is now ready to accept connections on port 6379
打开另外一个终端运行redis客户端：
[root@redis1 ~]# /opt/redis-2.8.12/src/redis-cli
127.0.0.1:6379> set name zhang
OK
127.0.0.1:6379> get name
"zhang"
2：安装配置keepalived
在master、slave安装keepalived：
[root@redis1 ~]# yum -y install keepalived
在Master上创建如下配置文件：
[root@redis1 ~]# vi /etc/keepalived/keepalived.conf
vrrp_script chk_redis {
script "/etc/keepalived/scripts/redis_check.sh" ###监控脚本
interval 2 ###监控时间
}
vrrp_instance VI_1 {
state MASTER ###设置为MASTER
interface eth1 ###监控网卡
virtual_router_id 51
priority 101 ###权重值
authentication {
auth_type PASS ###加密
auth_pass redis ###密码
}
track_script {
chk_redis ###执行上面定义的chk_redis
}
virtual_ipaddress {
192.168.1.40 ###VIP
}
notify_master /etc/keepalived/scripts/redis_master.sh
notify_backup /etc/keepalived/scripts/redis_backup.sh
notify_fault /etc/keepalived/scripts/redis_fault.sh
notify_stop /etc/keepalived/scripts/redis_stop.sh
}
在Slave上创建如下配置文件：
vi /etc/keepalived/keepalived.conf
vrrp_script chk_redis {
script "/etc/keepalived/scripts/redis_check.sh" ###监控脚本
interval 2 ###监控时间
}
vrrp_instance VI_1 {
state BACKUP ###设置为BACKUP
interface eth1 ###监控网卡
virtual_router_id 51
priority 100 ###比MASTRE权重值低
authentication {
auth_type PASS
auth_pass redis ###密码与MASTRE相同
}
track_script {
chk_redis ###执行上面定义的chk_redis
}
virtual_ipaddress {
192.168.1.40 ###VIP
}
notify_master /etc/keepalived/scripts/redis_master.sh
notify_backup /etc/keepalived/scripts/redis_backup.sh
notify_fault /etc/keepalived/scripts/redis_fault.sh
notify_stop /etc/keepalived/scripts/redis_stop.sh
}
在Master和Slave上创建监控Redis的脚本：
mkdir /etc/keepalived/scripts
vi /etc/keepalived/scripts/redis_check.sh
#!/bin/bash
ALIVE=`/opt/redis-2.8.12/src/redis-cli ping`
if [ "$ALIVE" == "PONG" ]; then
echo $ALIVE
exit 0
else
echo $ALIVE
exit 1
fi
编写以下负责运作的关键脚本：
notify_master /etc/keepalived/scripts/redis_master.sh
notify_backup /etc/keepalived/scripts/redis_backup.sh
notify_fault /etc/keepalived/scripts/redis_fault.sh
notify_stop /etc/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：
vi /etc/keepalived/scripts/redis_master.sh
#!/bin/bash
REDISCLI="/opt/redis-2.8.12/src/redis-cli"
LOGFILE="/opt/redis-2.8.12/log/keepalived-redis-state.log"
echo "[master]" >> $LOGFILE
date >> $LOGFILE
echo "Being master...." >> $LOGFILE 2>&1
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF 192.168.1.42 6379 >> $LOGFILE 2>&1
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
vi /etc/keepalived/scripts/redis_backup.sh
#!/bin/bash
REDISCLI="/opt/redis-2.8.12/src/redis-cli"
LOGFILE="/opt/redis-2.8.12/log/keepalived-redis-state.log"
echo "[backup]" >> $LOGFILE
date >> $LOGFILE
echo "Being slave...." >> $LOGFILE 2>&1
sleep 15 #延迟15秒待数据被对方同步完成之后再切换主从角色
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF 192.168.1.42 6379 >> $LOGFILE 2>&1
接着，在Redis Slave上创建notity_master与notify_backup脚本：
vi /etc/keepalived/scripts/redis_master.sh
#!/bin/bash
REDISCLI="/opt/redis-2.8.12/src/redis-cli"
LOGFILE="/opt/redis-2.8.12/log/keepalived-redis-state.log"
echo "[master]" >> $LOGFILE
date >> $LOGFILE
echo "Being master...." >> $LOGFILE 2>&1
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF 192.168.1.41 6379 >> $LOGFILE 2>&1
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
vi /etc/keepalived/scripts/redis_backup.sh
#!/bin/bash
REDISCLI="/opt/redis-2.8.12/src/redis-cli"
LOGFILE="/opt/redis-2.8.12/log/keepalived-redis-state.log"
echo "[backup]" >> $LOGFILE
date >> $LOGFILE
echo "Being slave...." >> $LOGFILE 2>&1
sleep 15 #延迟15秒待数据被对方同步完成之后再切换主从角色
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF 192.168.1.41 6379 >> $LOGFILE 2>&1
然后在Master与Slave创建如下相同的脚本：
vi /etc/keepalived/scripts/redis_fault.sh
#!/bin/bash
LOGFILE=/opt/redis-2.8.12/log/keepalived-redis-state.log
echo "[fault]" >> $LOGFILE
date >> $LOGFILE
vi /etc/keepalived/scripts/redis_stop.sh
#!/bin/bash
LOGFILE=/opt/redis-2.8.12/log/keepalived-redis-state.log
echo "[stop]" >> $LOGFILE
date >> $LOGFILE
给脚本都加上可执行权限：
chmod +x /etc/keepalived/scripts/*.sh
1.启动Master上的Redis
[root@redis1 log]# /opt/redis-2.8.12/src/redis-server &
2.启动Slave上的Redis
[root@redis2 log]# /opt/redis-2.8.12/src/redis-server &
3.启动Master上的Keepalived
[root@redis1 log]# /etc/init.d/keepalived start
4.启动Slave上的Keepalived
[root@redis2 log]# /etc/init.d/keepalived start
5.尝试通过VIP连接Redis:
/opt/redis-2.8.12/src/redis-cli -h 192.168.1.40 INFO
连接成功，Slave也连接上来了。
# Replication
role:master
connected_slaves:1
slave0:ip=192.168.1.42,port=6379,state=online,offset=156,lag=1
6.尝试插入一些数据：
/opt/redis-2.8.12/src/redis-cli -h 192.168.1.40 SET Hello Redis
OK
从VIP读取数据
/opt/redis-2.8.12/src/redis-cli -h 192.168.1.40 GET Hello
"Redis"
从Master读取数据
/opt/redis-2.8.12/src/redis-cli -h 192.168.1.41 GET Hello
"Redis"
从Slave读取数据
/opt/redis-2.8.12/src/redis-cli -h 192.168.1.42 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
tail f /opt/redis-2.8.12/log/keepalived-redis-state.log
[fault]
Thu Sep 27 08:29:01 CST 2012
同时Slave上的日志显示：
tail -80 /opt/redis-2.8.12/log/keepalived-redis-state.log
[master]
Fri Sep 28 14:14:09 CST 2012
Being master....
Run SLAVEOF cmd ...
OK
Run SLAVEOF NO ONE cmd ...
OK
然后可以发现，Slave已经接管服务，并且担任Master的角色了。
/opt/redis-2.8.12/src/redis-cli -h 192.168.1.40 INFO
/opt/redis-2.8.12/src/redis-cli -h 192.168.1.42 INFO
role:master
然后恢复Master的Redis进程
/opt/redis-2.8.12/src/redis-server &
查看Master上的Keepalived日志
tail -80 /opt/redis-2.8.12/log/keepalived-redis-state.log
[master]
Thu Sep 27 08:31:33 CST 2012
Being master....
Run SLAVEOF cmd ...
OK
Run SLAVEOF NO ONE cmd ...
OK
同时Slave上的日志显示：
tail -80 /opt/redis-2.8.12/log/keepalived-redis-state.log
[backup]
Fri Sep 28 14:16:37 CST 2012
Being slave....
Run SLAVEOF cmd ...
OK
可以发现目前的Master已经再次恢复了Master的角色，故障切换以及自动恢复都成功了。
参考文档：
http://blog.csdn.net/huwei2003/article/details/41894197
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