企业Redis+keepalived高可用实施方案

xsmscb

　　环境架构图：

　　环境部署
Redis-M10.20.0.100Redis-S10.20.0.200VIP10.20.0.150　　1,redis安装软件（两台同时安装M S）
　　#mkdir /home/tools -p
　　#cd /home/tools
　　#wget http://download.redis.io/releases/redis-3.0.5.tar.gz
　　#yum -y install tcl
　　#tar zxvf redis-3.0.5.tar.gz
　　#cd redis-3.0.5
　　#make   MALLOC=libc
　　#cd src && make all
　　#make PREFIX=/usr/local/redis install
　　#LANG=EN
　　#echo'export PATH=/usr/local/redis/bin/:$PATH' >> /etc/profile
　　#source /etc/profile
　　#mkdir /usr/local/redis/conf
　　#cd  /home/tools/redis-3.0.5
　　#cp redis.conf /usr/local/redis/conf/
　　#sysctl vm.overcommit_memory=1           如果不执行的话  会报错
　　#echo never > /sys/kernel/mm/transparent_hugepage/enabled
　　#redis-server /usr/local/redis/conf/redis.conf &  后台启动
　　#lsof-i:6379        查看端口

　　#COMMAND    PID USER  FD   TYPE DEVICE>　　#redis-ser5970 root    4u  IPv6 36532      0t0  TCP *:6379 (LISTEN)
　　#redis-ser5970 root    5u  IPv4 36534      0t0  TCP *:6379 (LISTEN)
　　#killall redis-server   杀掉redis进程 内存不够的话
　　#redis正确关闭方式
　　#redis-cli shutdown
　　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。
　　2,keepalived安装（两台同时安装）
　　# wget http://www.keepalived.org/software/keepalived-1.2.19.tar.gz
　　# keepalived-1.2.19.tar.gz
　　# cd /software
　　# tar zxvf keepalived-1.2.19.tar.gz
　　# cd keepalived-1.2.19
　　# ./configure
　　# make && make install
　　# /bin/cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/ ##生成启动命令
　　# /bin/cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/   ##配置启动脚本的参数
　　# mkdir /etc/keepalived     ##创建默认的keepalived配置文件路径
　　# /bin/cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/   ####把keepalived.conf模板拷贝到/etc/keepalived下
　　# /bin/cp /usr/local/sbin/keepalived /usr/sbin/
　　# /etc/init.d/keepalived start 或者/etc/init.d/keepalived stop
　　查看进程是否起来
　　#ps -ef | grep keepalived
　　添加日志
　　vi /etc/sysconfig/keepalived
　　KEEPALIVED_OPTIONS="-D -d -S 0"
　　##参数解释都在#注释里面
　　2. 修改主从节点日志配置文件/etc/rsyslog.conf
　　#vi /etc/rsyslog.conf
　　加入如下配置：
　　#keepalived -S 0
　　local0.* /var/log/keepalived.log
　　3.重启日志服务
　　# /etc/init.d/rsyslog restart
　　4.检查/var/log/keepalived.log文件是否存在
　　3,设置master上面的配置文件
　　vim /etc/keepalived/keepalived.conf
　　global_defs {
　　router_id redis100
　　}
　　vrrp_script chk_redis {
　　script "/etc/keepalived/scripts/redis_check.sh"
　　interval 2
　　}
　　vrrp_instance VI_1 {
　　state MASTER
　　interface eth0
　　virtual_router_id 51
　　priority 150
　　advert_int 1
　　authentication {
　　auth_type PASS
　　auth_pass 1111
　　}
　　track_script {
　　chk_redis
　　}
　　virtual_ipaddress {
　　10.20.0.150
　　}
　　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
　　}
　　4,设置Slave配置
　　vim /etc/keepalived/keepalived.conf
　　global_defs {
　　router_id redis200
　　}
　　vrrp_script chk_redis {
　　script "/etc/keepalived/scripts/redis_check.sh"
　　interval 2
　　}
　　vrrp_instance VI_1 {
　　state BACKUP
　　interface eth0
　　virtual_router_id 51
　　priority 100
　　advert_int 1
　　authentication {
　　auth_type PASS
　　auth_pass 1111
　　}
　　track_script {
　　chk_redis
　　}
　　virtual_ipaddress {
　　10.20.0.150
　　}
　　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
　　}
　　
　　5,在Master和Slave上创建监控Redis的脚本
　　# mkdir/etc/keepalived/scripts
　　# vim/etc/keepalived/scripts/redis_check.sh
　　cat redis_check.sh
　　#!/bin/bash
　　ALIVE=`/usr/local/redis/bin/redis-cli PING`
　　if [ "$ALIVE" == "PONG" ]; then
　　echo $ALIVE
　　exit 0
　　else
　　echo $ALIVE
　　exit 1
　　fi
　　6,在slave从服务器创建redis的脚本
　　#!/bin/bash
　　ALIVE=`/usr/local/redis/bin/redis-cli PING`
　　if [ "$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
　　7,首先，在Redis Master上创建notity_master与notify_backup两个文件脚本：
　　# vim/etc/keepalived/scripts/redis_master.sh
　　cat redis_master.sh
　　#!/bin/bash
　　REDISCLI="/usr/local/redis/bin/redis-cli"
　　LOGFILE="/var/log/keepalived-redis-state.log"
　　echo "[master]" >> $LOGFILE
　　echo "Being master...." >> $LOGFILE 2>&1
　　echo "Run SLAVEOF cmd ..." >> $LOGFILE
　　$REDISCLI SLAVEOF 10.20.0.200 6379 >> $LOGFILE  2>&1
　　sleep 10
　　echo "Run SLAVEOF NO ONE cmd ..." >> $LOGFILE
　　$REDISCLI SLAVEOF NO ONE >> $LOGFILE 2>&1
　　# vim /etc/keepalived/scripts/redis_backup.sh
　　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
　　sleep 15
　　echo "Run SLAVEOF cmd ..." >> $LOGFILE
　　$REDISCLI SLAVEOF 10.20.0.200 6379 >> $LOGFILE  2>&1
　　接着，在RedisSlave从服务器上创建notity_master与notify_backup脚本：
　　# vim/etc/keepalived/scripts/redis_master.sh
　　cat redis_master.sh
　　#!/bin/bash
　　REDISCLI="/usr/local/redis/bin/redis-cli"
　　LOGFILE="/var/log/keepalived-redis-state.log"
　　echo "[master]" >> $LOGFILE
　　echo "Being master...." >> $LOGFILE 2>&1
　　echo "Run SLAVEOF cmd ..." >> $LOGFILE
　　$REDISCLI SLAVEOF 10.20.0.100 6379 >> $LOGFILE  2>&1
　　sleep 10
　　echo "Run SLAVEOF NO ONE cmd ..." >> $LOGFILE
　　$REDISCLI SLAVEOF NO ONE >> $LOGFILE 2>&1
　　# vim /etc/keepalived/scripts/redis_backup.sh
　　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
　　sleep 15
　　echo "Run SLAVEOF cmd ..." >> $LOGFILE
　　$REDISCLI SLAVEOF 10.20.0.100 6379 >> $LOGFILE  2>&1
　　8,然后在master和slave服务器各自创建相同的脚本
　　# vim /etc/keepalived/scripts/redis_fault.sh
　　cat redis_fault.sh
　　#!/bin/bash
　　LOGFILE=/var/log/keepalived-redis-state.log
　　echo "[fault]" >> $LOGFILE
　　date >> $LOGFILE
　　# vim /etc/keepalived/scripts/redis_stop.sh
　　# cat redis_stop.sh
　　#!/bin/bash
　　LOGFILE=/var/log/keepalived-redis-state.log
　　echo "[stop]" >> $LOGFILE
　　date >> $LOGFILE
　　主从服务器：给脚本加上可执行的权限
　　# chmod +x/etc/keepalived/scripts/*.sh
　　# chmod +x/etc/keepalived/scripts/*.sh
　　9,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
　　2.启动Slave上的Redis
　　3.启动Master上的Keepalived
　　/etc/init.d/keepalivedstart
　　4.启动Slave上的Keepalived
　　/etc/init.d/keepalivedstart