单机redis多端口实例+keepalived高可用

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一、实验环境说明

 192.168.115.21（keepalived+redis）

 192.168.115.95（keepalived+redis）

 VIP：192.168.115.99


二、安装redis和keepalived

  这个就不细说了，你yum安装，或者源码编译安装都可以的


三、配置redis

   192.168.115.21：

redis 6379端口的配置文件

egrep -v "(^$|^#)" /usr/local/rktsapps/redis/etc/redis_6379.conf

daemonize yes
pidfile /var/run/redis.pid
port 6379
tcp-backlog 10000
timeout 0
tcp-keepalive 100
loglevel notice
logfile "/usr/local/rktsapps/redis/log/redis.log"
databases 16
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
dir /usr/local/rktsapps/redis/data/
slave-serve-stale-data yes
slave-read-only yes
repl-disable-tcp-nodelay no
slave-priority 100
appendonly yes
appendfilename "appendonly.aof"
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-entries 512
list-max-ziplist-value 64
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
aof-rewrite-incremental-fsync yes

redis 6380端口的配置文件，跟6379的主要区别的几个参数是：    

pidfile /var/run/redis_6380.pid
port 6380
logfile "/usr/local/rktsapps/redis/log/redis_6380.log"
dbfilename dump_6380.rdb
appendfilename "appendonly_6380.aof"

主要就是这5个地方。


  192.168.115.95：

    95的redis配置，也是配置6379和6380两个redis，配置文件内容都是一样的


四、启动redis

    分别在192.168.115.21和192.168.115.95上面启动redis的两个端口：

/usr/local/rktsapps/redis/bin/redis-server /usr/local/rktsapps/redis/etc/redis_6379.conf
/usr/local/rktsapps/redis/bin/redis-server /usr/local/rktsapps/redis/etc/redis_6380.conf


五、配置keepalived：

  192.168.115.21：

  egrep -v "(^#|^$)" /usr/local/rktsapps/keepalived/etc/keepalived/keepalived.conf

 Configuration File for keepalived
global_defs {
   router_id LVS_Redis2
}
vrrp_script chk_down {
    script "/usr/local/rktsapps/keepalived/scripts/test_check.sh"
    interval 2
    #weight -10
    fall 2
    rise 1
}
vrrp_instance VI_1 {
     state BACKUP
    interface eth0
    virtual_router_id 51
    priority 80
    nopreempt
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass keepalivepass
    }
    virtual_ipaddress {
192.168.115.99/24 dev eth0 label eth0:0
    }
   track_script {
       chk_down
}
   track_interface {
                eth0
}
    notify_master "/usr/local/rktsapps/keepalived/scripts/test_master.sh"
    notify_backup "/usr/local/rktsapps/keepalived/scripts/test_backup.sh"
    notify_fault /usr/local/rktsapps/keepalived/scripts/test_fault.sh 
    notify_stop /usr/local/rktsapps/keepalived/scripts/test_stop.sh
}



  192.168.115.95：

  egrep -v "(^#|^$)" /usr/local/rktsapps/keepalived/etc/keepalived/keepalived.conf

! Configuration File for keepalived
global_defs {
   router_id LVS_Redis1
}
vrrp_script chk_down {
    script "/usr/local/rktsapps/keepalived/scripts/test_check.sh"
    interval 2
    #weight -10
    fall 2
    rise 1
}
vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 100
    nopreempt
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass keepalivepass
    }
    virtual_ipaddress {
192.168.115.99/24 dev eth0 label eth0:0
    }
   track_script {
       chk_down
}
   track_interface {
                eth0
}
    notify_master "/usr/local/rktsapps/keepalived/scripts/test_master.sh"
    notify_backup "/usr/local/rktsapps/keepalived/scripts/test_backup.sh"
    notify_fault /usr/local/rktsapps/keepalived/scripts/test_fault.sh 
    notify_stop /usr/local/rktsapps/keepalived/scripts/test_stop.sh
}

这里先设置192.168.115.95为keepalived的master，192.168.115.21为backup


设置keepalived需要的5个脚本（两个keepalived可以使用相同的如下脚本）

cat test_check.sh （检查是否所有启动的redis端口都可以正常工作，如果都ok，返回0，表示脚本正常执行）

#!/bin/bash
ports=(6379 6380)
port_num=${#ports[@]}
pong_num=0
for port in ${ports[*]}
do
ALIVE=`/usr/local/bin/redis-cli -p $port PING` 
LOGFILE="/var/log/keepalived-redis-check.log" 
echo "[CHECK]" >> $LOGFILE
date >> $LOGFILE
if [ $ALIVE == "PONG" ]; then :
pong_num=$[$pong_num+1]
echo "Success: redis-cli -p $port PING $ALIVE" >> $LOGFILE 2>&1
else 
echo "Failed:redis-cli  -p $port PING $ALIVE " >> $LOGFILE 2>&1
fi
done
if [ $port_num -eq $pong_num ];then
exit 0
else 
exit 1
fi


cat test_master.sh （成为master的时候，redis取消同步）

#!/bin/bash
ports=(6379 6380)
port_num=${#ports[@]}
LOGFILE="/var/log/keepalived-redis-state.log"
for port in ${ports[*]}
do
echo "[master]" >> $LOGFILE
date >> $LOGFILE
echo "Being master...." >> $LOGFILE 2>&1
echo "Run MASTER cmd ..." >> $LOGFILE 2>&1
echo "Run -p $port SLAVEOF NO ONE cmd ..." >> $LOGFILE
/usr/local/bin/redis-cli -p $port slaveof no one >> $LOGFILE 2>&1
done


cat test_backup.sh （成为backup的时候，redis开启同步）

#!/bin/bash
ports=(6379 6380)
port_num=${#ports[@]}
LOGFILE="/var/log/keepalived-redis-state.log"
other_ip="192.168.115.95"
for port in ${ports[*]}
do
echo "[backup]" >> $LOGFILE
date >> $LOGFILE
echo "Being backup...." >> $LOGFILE 2>&1
echo "Run BACKUP cmd ..." >> $LOGFILE 2>&1
echo "Run -p $port SLAVEOF $other_ip cmd ..." >> $LOGFILE
/usr/local/bin/redis-cli -p $port slaveof $other_ip $port >> $LOGFILE 2>&1
done

这里要注意一下

other_ip="192.168.115.95"

是指另外一台keepalived的ip地址。


cat test_fault.sh （如果检查到有redis端口down掉，会立马重新启动，然后keepalived状态会从fault状态转成backup状态）

#!/bin/bash
ports=(6379 6380)
port_num=${#ports[@]}
LOGFILE=/var/log/keepalived-redis-state.log 
echo "[fault]" >> $LOGFILE
date >> $LOGFILE
for port in ${ports[*]}
do
ALIVE=`/usr/local/bin/redis-cli -p $port PING`
if [ "$ALIVE" != "PONG" ]; then
netstat -tlpn | grep redis | grep $port 2>&1
if [ $? -eq 0 ]; then
kill_port=`netstat -tlpn | grep redis | grep 0.0.0.0:$port | awk ‘{print $7}‘ | awk -F/ ‘{print $1}‘`
kill -9 $kill_port
fi
/usr/local/rktsapps/redis/bin/redis-server /usr/local/rktsapps/redis/etc/redis_$port.conf
fi
done


cat test_stop.sh （keepalived挂掉的情况下）

#!/bin/bash 
LOGFILE=/var/log/keepalived-redis-state.log 
echo "[stop]" >> $LOGFILE 
date >> $LOGFILE


因为Keepalived在转换状态时会依照状态来呼叫：
notify_master 当进入Master状态时会呼叫notify_master
notify_backup 当进入Backup状态时会呼叫notify_backup
notify_fault  当发现异常情况时进入Fault状态呼叫notify_fault
notify_stop 当Keepalived程序终止时则呼叫notify_stop



六、启动keepalived

    先在192.168.115.95上面启动keepalived，因为他做为master

    再在192.168.115.21上面启动keepalived

/usr/local/rktsapps/keepalived/sbin/keepalived -f /usr/local/rktsapps/keepalived/etc/keepalived/keepalived.conf

如果没有启动脚本，可以使用上面的方法来启动keepalived


七、测试

    这个大家可以自己手动关闭redis或者keepalived测试一下。我这边测试过了，都是ok的。

    keepalived状态变化的信息主要在/var/log/messages里面，上面keepalived脚本里面也有自定义的日志文件

/var/log/keepalived-redis-state.log

和

/var/log/keepalived-redis-check.log


ok，至此结束！

本文出自 “郑小明的技术博客” 博客，请务必保留此出处http://zhengmingjing.blog.51cto.com/1587142/1863901

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