(WJW)Redis高可用安装笔记
[x] 安装环境介绍:
Master: T1
Slave: T2
VIP: 192.168.68.45
[x] 安装Redis(Master,Slave)
注意: 安装redis前flushall的修改
查找
src/redis.c文件,把`{"flushdb",flushdbCommand,1,"w",0,NULL,0,0,0,0,0},` `{"flushall",flushallCommand,1,"w",0,NULL,0,0,0,0,0},`修改成:
`{"xflushdb",flushdbCommand,1,"w",0,NULL,0,0,0,0,0},` `{"xflushall",flushallCommand,1,"w",0,NULL,0,0,0,0,0},`
vi /etc/sysctl.conf 添加一行: `vm.overcommit_memory=1` mkdir /opt/redis mkdir /opt/redis/log mkdir /opt/redis/db tar zxvf ./redis-2.8.17.tar.gz cd redis-2.8.17 make PREFIX=/opt/redis install
[x] Redis启动脚本(Master,Slave):/opt/redis/bin/startRedis.sh
#!/bin/bash basedir=`dirname $0` echo "Redis BASE DIR:$basedir" cd $basedir nohup ./redis-server ./redis.conf > /dev/null 2>&1 &
[x] Redis停止脚本(Master,Slave):/opt/redis/bin/StopRedis.sh
#!/bin/sh basedir=`dirname $0` echo "Redis BASE DIR:$basedir" cd $basedir ./redis-cli -h localhost -a 123456 shutdown
[x] Redis配置文件(Master,Slave):/opt/redis/bin/redis.conf
#requirepass 123456 pidfile /opt/redis/bin/redis.pid logfile /opt/redis/log/redis.log dir /opt/redis/db/ daemonize yes port 6379 timeout 300 loglevel warning databases 16 maxmemory 1g #不要快照 #save 900 1 #save 300 10 #save 60 10000 #rdbcompression yes #dbfilename dump.rdb #使用AOF appendonly yes appendfsync everysec
[x] 安装Keepalived(Master,Slave):
#wget http://www.keepalived.org/software/keepalived-1.2.13.tar.gz tar zxvf keepalived-1.2.13.tar.gz cd ./keepalived-1.2.13 ./configure make make 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 cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/ chkconfig --add keepalived #chkconfig --level 35 keepalived on #service keepalived start
[x] notify_*解释
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(track_script,track_interface失败)进入Fault状态呼叫notify_fault 当Keepalived程序终止时则呼叫notify_stop
[x] 在Master上创建如下配置文件：
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
[email protected]
}
notification_email_from [email protected]
smtp_server localhost
smtp_connect_timeout 30
router_id LVS_REDIS
}
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 {
nopreempt ###不抢占,防止脑裂
state MASTER #备的是BACKUP
interface br0
virtual_router_id 51
priority 100 #备的是90
advert_int 1
authentication {
auth_type PASS
auth_pass redis
}
virtual_ipaddress {
192.168.68.45
}
track_script {
chk_redis ###执行上面定义的chk_redis
}
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
}
[x] 在Slave上创建如下配置文件：
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
[email protected]
}
notification_email_from [email protected]
smtp_server localhost
smtp_connect_timeout 30
router_id LVS_REDIS
}
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 {
nopreempt ###不抢占,防止脑裂
state BACKUP #备的是BACKUP
interface br0
virtual_router_id 51
priority 90 #备的是90
advert_int 1
authentication {
auth_type PASS
auth_pass redis
}
virtual_ipaddress {
192.168.68.45
}
track_script {
chk_redis ###执行上面定义的chk_redis
}
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
}
[x] 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
C_DATE=`date +"[%Y-%m-%d %H:%M:%S]"`
ALIVE=`/opt/redis/bin/redis-cli PING`
if [ "$ALIVE" == "PONG" ]; then
echo "${C_DATE} $ALIVE"
exit 0
else
echo "${C_DATE} $ALIVE"
exit 1
fi
[x] 在Master与Slave创建如下脚本notify_fault和notify_stop：
vim /etc/keepalived/scripts/redis_fault.sh
#!/bin/bash
C_DATE=`date +"[%Y-%m-%d %H:%M:%S]"`
LOGFILE=/var/log/keepalived-redis-state.log
echo "${C_DATE} [fault]" >> $LOGFILE
vim /etc/keepalived/scripts/redis_stop.sh
#!/bin/bash
C_DATE=`date +"[%Y-%m-%d %H:%M:%S]"`
LOGFILE=/var/log/keepalived-redis-state.log
echo "${C_DATE} [stop]" >> $LOGFILE
[x] 在Master上创建notity_master与notify_backup脚本:
vim /etc/keepalived/scripts/redis_master.sh
#!/bin/bash
C_DATE=`date +"[%Y-%m-%d %H:%M:%S]"`
REDISCLI="/opt/redis/bin/redis-cli"
LOGFILE="/var/log/keepalived-redis-state.log"
echo "${C_DATE} [master]" >> $LOGFILE
#当keepalived配置为"抢占式"时,打开下面注释
#echo "Being master...." >> $LOGFILE 2>&1
#echo "Run SLAVEOF cmd ..." >> $LOGFILE
#$REDISCLI SLAVEOF T2 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 >> $LOGFILE 2>&1
vim /etc/keepalived/scripts/redis_backup.sh
#!/bin/bash
C_DATE=`date +"[%Y-%m-%d %H:%M:%S]"`
REDISCLI="/opt/redis/bin/redis-cli"
LOGFILE="/var/log/keepalived-redis-state.log"
echo "${C_DATE} [backup]" >> $LOGFILE
#当keepalived配置为"抢占式"时,打开下面注释
#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 T2 6379 >> $LOGFILE 2>&1
[x] 在Slave上创建notity_master与notify_backup脚本:
vim /etc/keepalived/scripts/redis_master.sh
#!/bin/bash
C_DATE=`date +"[%Y-%m-%d %H:%M:%S]"`
REDISCLI="/opt/redis/bin/redis-cli"
LOGFILE="/var/log/keepalived-redis-state.log"
echo "${C_DATE} [master]" >> $LOGFILE
#当keepalived配置为"抢占式"时,打开下面注释
#echo "Being master...." >> $LOGFILE 2>&1
#echo "Run SLAVEOF cmd ..." >> $LOGFILE
#$REDISCLI SLAVEOF T1 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 >> $LOGFILE 2>&1
vim /etc/keepalived/scripts/redis_backup.sh
#!/bin/bash
C_DATE=`date +"[%Y-%m-%d %H:%M:%S]"`
REDISCLI="/opt/redis/bin/redis-cli"
LOGFILE="/var/log/keepalived-redis-state.log"
echo "${C_DATE} [backup]" >> $LOGFILE
#当keepalived配置为"抢占式"时,打开下面注释
#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 T1 6379 >> $LOGFILE 2>&1
[x] 在Master和Slave上,给监控脚本都加上可执行权限：
chmod +x /etc/keepalived/scripts/*.sh
[x] 启动步骤:
- 启动Master上的Redis
/opt/redis/bin/startRedis.sh - 启动Slave上的Redis
/opt/redis/bin/startRedis.sh - 启动Master上的Keepalived
service keepalived start - 启动Slave上的Keepalived
service keepalived start
时间： 2024-11-11 12:26:34