keepalived怎么配置redis主从切换

发布时间：2021-09-14 17:49:22 来源：亿速云阅读：170 作者：chen 栏目：建站服务器

本篇内容介绍了“keepalived怎么配置redis主从切换”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！

IP规划：

主节点：10.0.37.224

备节点：10.0.37.225

VIP：10.0.37.226

一 2个节点安装redis

1 安装

[root@ray0redis02 ~]# wget http://download.redis.io/releases/redis-4.0.9.tar.gz

[root@ray0redis02 ~]# tar xzf redis-4.0.9.tar.gz

[root@ray0redis02 ~]# cd redis-4.0.9

[root@ray0redis02 ~]# make

[root@ray0redis02 ~]# make install

[root@ray0redis02 ~]# mkdir -p /usr/local/redis/bin

[root@ray0redis02 ~]# mkdir -p /usr/local/redis/etc

[root@ray0redis02 ~]# cp redis.conf /usr/local/redis/etc

[root@ray0redis02 ~]# cd src/

[root@ray0redis02 ~]# cp mkreleasehdr.sh redis-benchmark redis-check-aof redis-cli redis-server /usr/local/redis/bin

#[root@ray0redis02 ~]$ vi /usr/local/redis/etc/redis.conf #将daemonize的值改为yes

[root@ray0redis02 ~]# sed -i 's/daemonize no/daemonize yes/g' /usr/local/redis/etc/redis.conf

#启动

[root@ray0redis02 ~]# /usr/local/redis/bin/redis-server /usr/local/redis/etc/redis.conf

2 配置备节点slave信息

[root@ray0redis02 ~]# grep "^slaveof" /usr/local/redis/etc/redis.conf

slaveof 10.0.37.224 6379

#启动

[root@ray0redis02 ~]# /usr/local/redis/bin/redis-server /usr/local/redis/etc/redis.conf

二安装keepalived

1 两个节点都使用yum安装keepalived

[root@ray0redis01 ~]# yum -y install keepalived

[root@ray0redis02 ~]# yum -y install keepalived

2 主节点keepalived配置文件

[root@ray0redis01 ~]# cat /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

router_id redis01

}

vrrp_script chk_redis

{

script "/etc/keepalived/scripts/redis_check.sh"

interval 2

timeout 2

fall 3

}

vrrp_instance redis {

state MASTER

interface ens192 ##需要修改为实际网卡名称

virtual_router_id 60

priority 100 ##权重，数字越大权重越大，主节点数值大于备节点

advert_int 1

authentication { #all node must same

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

10.0.37.226 ##需要修改为实际分配的虚拟IP

}

track_script {

chk_redis

}

notify_master "/etc/keepalived/scripts/redis_master.sh 127.0.0.1 10.0.37.225 6379" ## 10.0.37.225需要修改为实际的远端主机IP

notify_backup "/etc/keepalived/scripts/redis_backup.sh 127.0.0.1 10.0.37.225 6379" ## 10.0.37.225需要修改为实际的远端主机IP

notify_fault /etc/keepalived/scripts/redis_fault.sh

notify_stop /etc/keepalived/scripts/redis_stop.sh

}

3 备节点keepalived配置文件

[root@ray0redis02 ~]# cat /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

router_id redis02

}

vrrp_script chk_redis

{

script "/etc/keepalived/scripts/redis_check.sh"

interval 2

timeout 2

fall 3

}

vrrp_instance redis {

state BACKUP

interface ens192 ##需要修改为实际网卡名称

virtual_router_id 60

priority 90

advert_int 1

authentication { #all node must same

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

10.0.37.226 ##需要修改为实际分配的虚拟IP

}

track_script {

chk_redis

}

notify_master "/etc/keepalived/scripts/redis_master.sh 127.0.0.1 10.0.37.224 6379" ## 10.0.37.224需要修改为实际的远端主机IP

notify_backup "/etc/keepalived/scripts/redis_backup.sh 127.0.0.1 10.0.37.224 6379" ## 10.0.37.224需要修改为实际的远端主机IP

notify_fault /etc/keepalived/scripts/redis_fault.sh

notify_stop /etc/keepalived/scripts/redis_stop.sh

}

virtual_server 10.0.37.226 6379 {

delay_loop 6

lb_algo rr

lb_kind NAT

nat_mask 255.255.255.0

persistence_timeout 50

protocol TCP

sorry_server 127.0.0.1 80

real_server 10.0.37.224 6379 {

weight 1

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

connect_port 6379

}

real_server 10.0.37.225 6379 {

weight 1

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

connect_port 6379

}

4 两个节点所有的脚本

[root@ray0redis01 ~]# cat /etc/keepalived/scripts/redis_check.sh

#!/bin/bash

ALIVE=`/usr/local/redis/bin/redis-cli -a 123456 PING`

[ "$ALIVE" == "PONG" ] && { echo $ALIVE && exit 0; } || { echo $ALIVE && exit 1; }

[root@ray0redis01 ~]# cat /etc/keepalived/scripts/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

echo "Run MASTER cmd ..." >> $LOGFILE

$REDISCLI SLAVEOF $2 $3 >> $LOGFILE

sleep 10 #delay 10 s wait data async cancel sync

echo "Run SLAVEOF NO ONE cmd ..." >> $LOGFILE

${REDISCLI} SLAVEOF NO ONE >> $LOGFILE

[root@ray0redis01 ~]# cat /etc/keepalived/scripts/redis_backup.sh

#!/bin/bash

REDISCLI="/usr/local/redis/bin/redis-cli -h $1 -p $3"

LOGFILE="/var/log/keepalived-redis-state.log"

echo "[backup]" >> $LOGFILE

date >> $LOGFILE

echo "Run SLAVEOF cmd ..." >> $LOGFILE

$REDISCLI SLAVEOF $2 $3 >> $LOGFILE 2>&1

sleep 15 #delay 15 s wait data sync exchange role

[root@ray0redis01 ~]# cat /etc/keepalived/scripts/redis_fault.sh

#!/bin/bash

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

echo -e "[fault]\t$(date '+%F %T')" >> $LOGFILE

[root@ray0redis01 ~]# cat /etc/keepalived/scripts/redis_stop.sh

#!/bin/bash

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

三启动keepalived，验证HA的情况和切换

[root@ray0redis01 ~]# systemctl status keepalived

● keepalived.service - LVS and VRRP High Availability Monitor

Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)

Active: active (running) since Mon 2018-12-03 20:41:42 EST; 1h 10min ago

Process: 5122 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)

Main PID: 5124 (keepalived)

CGroup: /system.slice/keepalived.service

├─5124 /usr/sbin/keepalived -D

├─5125 /usr/sbin/keepalived -D

└─5126 /usr/sbin/keepalived -D

Dec 03 20:57:08 ray0redis01 Keepalived_vrrp[5126]: Sending gratuitous ARP on ens192 for 10.0.37.226

Dec 03 20:57:08 ray0redis01 Keepalived_vrrp[5126]: Opening script file /etc/keepalived/scripts/redis_master.sh

Dec 03 20:57:13 ray0redis01 Keepalived_vrrp[5126]: Sending gratuitous ARP on ens192 for 10.0.37.226

Dec 03 20:57:13 ray0redis01 Keepalived_vrrp[5126]: VRRP_Instance(redis) Sending/queueing gratuitous ARPs on ens192 for 10.0.37.226

Dec 03 20:57:13 ray0redis01 Keepalived_vrrp[5126]: Sending gratuitous ARP on ens192 for 10.0.37.226

[root@ray0redis01 ~]# /usr/local/redis/bin/redis-cli info | egrep -A11 Replication

# Replication

role:master

connected_slaves:1

slave0:ip=10.0.37.225,port=6379,state=online,offset=4928,lag=1

master_replid:ac8db2b7075f51c318b978be0a350b7fd987ddbb

master_replid2:3e93b153857adbdfa981a3f66fd18244b9bfae5c

master_repl_offset:4928

second_repl_offset:183

repl_backlog_active:1

repl_backlog_size:1048576

repl_backlog_first_byte_offset:183

repl_backlog_histlen:4746

#杀掉redis进程

[root@ray0redis01 ~]# kill -9 6605

[root@ray0redis01 ~]# systemctl status keepalived

● keepalived.service - LVS and VRRP High Availability Monitor

Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)

Active: active (running) since Mon 2018-12-03 20:41:42 EST; 1h 12min ago

Process: 5122 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)

Main PID: 5124 (keepalived)

CGroup: /system.slice/keepalived.service

├─5124 /usr/sbin/keepalived -D

├─5125 /usr/sbin/keepalived -D

└─5126 /usr/sbin/keepalived -D

Dec 03 20:57:08 ray0redis01 Keepalived_vrrp[5126]: Sending gratuitous ARP on ens192 for 10.0.37.226

Dec 03 20:57:08 ray0redis01 Keepalived_vrrp[5126]: Opening script file /etc/keepalived/scripts/redis_master.sh

Dec 03 20:57:13 ray0redis01 Keepalived_vrrp[5126]: Sending gratuitous ARP on ens192 for 10.0.37.226

Dec 03 20:57:13 ray0redis01 Keepalived_vrrp[5126]: VRRP_Instance(redis) Sending/queueing gratuitous ARPs on ens192 for 10.0.37.226

Dec 03 20:57:13 ray0redis01 Keepalived_vrrp[5126]: Sending gratuitous ARP on ens192 for 10.0.37.226

Dec 03 21:54:33 ray0redis01 Keepalived_vrrp[5126]: /etc/keepalived/scripts/redis_check.sh exited with status 1

Dec 03 21:54:34 ray0redis01 Keepalived_healthcheckers[5125]: TCP connection to [10.0.37.224]:6379 failed.

#观察备节点状态，完成切换

[root@ray0redis02 ~]# systemctl status keepalived

● keepalived.service - LVS and VRRP High Availability Monitor

Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)

Active: active (running) since Mon 2018-12-03 20:54:37 EST; 1h 0min ago

Process: 6112 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)

Main PID: 6114 (keepalived)

CGroup: /system.slice/keepalived.service

├─6114 /usr/sbin/keepalived -D

├─6115 /usr/sbin/keepalived -D

└─6116 /usr/sbin/keepalived -D

Dec 03 21:54:39 ray0redis02 Keepalived_vrrp[6116]: Opening script file /etc/keepalived/scripts/redis_master.sh

Dec 03 21:54:41 ray0redis02 Keepalived_healthcheckers[6115]: TCP connection to [10.0.37.224]:6379 failed.

Dec 03 21:54:41 ray0redis02 Keepalived_healthcheckers[6115]: Check on service [10.0.37.224]:6379 failed after 1 retry.

Dec 03 21:54:41 ray0redis02 Keepalived_healthcheckers[6115]: Removing service [10.0.37.224]:6379 from VS [10.0.37.226]:6379

Dec 03 21:54:44 ray0redis02 Keepalived_vrrp[6116]: Sending gratuitous ARP on ens192 for 10.0.37.226

Dec 03 21:54:44 ray0redis02 Keepalived_vrrp[6116]: VRRP_Instance(redis) Sending/queueing gratuitous ARPs on ens192 for 10.0.37.226

Dec 03 21:54:44 ray0redis02 Keepalived_vrrp[6116]: Sending gratuitous ARP on ens192 for 10.0.37.226

[root@ray0redis02 ~]# tail -20f /var/log/messages

Dec 3 21:54:38 localhost Keepalived_healthcheckers[6115]: TCP connection to [10.0.37.224]:6379 failed.

Dec 3 21:54:38 localhost Keepalived_vrrp[6116]: VRRP_Instance(redis) Transition to MASTER STATE

Dec 3 21:54:39 localhost Keepalived_vrrp[6116]: VRRP_Instance(redis) Entering MASTER STATE

Dec 3 21:54:39 localhost Keepalived_vrrp[6116]: VRRP_Instance(redis) setting protocol VIPs.

Dec 3 21:54:39 localhost Keepalived_vrrp[6116]: Sending gratuitous ARP on ens192 for 10.0.37.226

Dec 3 21:54:39 localhost Keepalived_vrrp[6116]: VRRP_Instance(redis) Sending/queueing gratuitous ARPs on ens192 for 10.0.37.226

Dec 3 21:54:39 localhost Keepalived_vrrp[6116]: Sending gratuitous ARP on ens192 for 10.0.37.226

Dec 3 21:54:39 localhost NetworkManager[758]: <info> [1543892079.9698] policy: set-hostname: current hostname was changed outside NetworkManager: 'ray0redis02'

Dec 3 21:54:41 localhost Keepalived_healthcheckers[6115]: TCP connection to [10.0.37.224]:6379 failed.

Dec 3 21:54:41 localhost Keepalived_healthcheckers[6115]: Check on service [10.0.37.224]:6379 failed after 1 retry.

Dec 3 21:54:41 localhost Keepalived_healthcheckers[6115]: Removing service [10.0.37.224]:6379 from VS [10.0.37.226]:6379

Dec 3 21:54:44 localhost Keepalived_vrrp[6116]: Sending gratuitous ARP on ens192 for 10.0.37.226

Dec 3 21:54:44 localhost Keepalived_vrrp[6116]: VRRP_Instance(redis) Sending/queueing gratuitous ARPs on ens192 for 10.0.37.226

Dec 3 21:54:44 localhost Keepalived_vrrp[6116]: Sending gratuitous ARP on ens192 for 10.0.37.226

#启动主节点，keepalived和redis切换回主节点

[root@ray0redis01 ~]# /usr/local/redis/bin/redis-server /usr/local/redis/etc/redis.conf

12049:C 03 Dec 21:56:37.698 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo

12049:C 03 Dec 21:56:37.698 # Redis version=4.0.9, bits=64, commit=00000000, modified=0, pid=12049, just started

12049:C 03 Dec 21:56:37.698 # Configuration loaded

[root@ray0redis01 ~]# systemctl status keepalived

● keepalived.service - LVS and VRRP High Availability Monitor

Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)

Active: active (running) since Mon 2018-12-03 20:41:42 EST; 1h 14min ago

Process: 5122 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)

Main PID: 5124 (keepalived)

CGroup: /system.slice/keepalived.service

├─ 5124 /usr/sbin/keepalived -D

├─ 5125 /usr/sbin/keepalived -D

├─ 5126 /usr/sbin/keepalived -D

├─12057 /usr/sbin/keepalived -D

├─12058 /bin/bash /etc/keepalived/scripts/redis_backup.sh 127.0.0.1 10.0.37.225 6379

└─12061 sleep 15

Dec 03 21:56:26 ray0redis01 Keepalived_vrrp[5126]: /etc/keepalived/scripts/redis_check.sh exited with status 1

Dec 03 21:56:28 ray0redis01 Keepalived_vrrp[5126]: /etc/keepalived/scripts/redis_check.sh exited with status 1

Dec 03 21:56:30 ray0redis01 Keepalived_vrrp[5126]: /etc/keepalived/scripts/redis_check.sh exited with status 1

Dec 03 21:56:32 ray0redis01 Keepalived_vrrp[5126]: /etc/keepalived/scripts/redis_check.sh exited with status 1

Dec 03 21:56:34 ray0redis01 Keepalived_vrrp[5126]: /etc/keepalived/scripts/redis_check.sh exited with status 1

Dec 03 21:56:36 ray0redis01 Keepalived_vrrp[5126]: /etc/keepalived/scripts/redis_check.sh exited with status 1

Dec 03 21:56:38 ray0redis01 Keepalived_vrrp[5126]: VRRP_Script(chk_redis) succeeded

Dec 03 21:56:38 ray0redis01 Keepalived_vrrp[5126]: VRRP_Instance(redis) Entering BACKUP STATE

Dec 03 21:56:38 ray0redis01 Keepalived_vrrp[5126]: Opening script file /etc/keepalived/scripts/redis_backup.sh

Dec 03 21:56:39 ray0redis01 Keepalived_vrrp[5126]: VRRP_Instance(redis) forcing a new MASTER election

[root@ray0redis01 ~]#

[root@ray0redis01 ~]# systemctl status keepalived

● keepalived.service - LVS and VRRP High Availability Monitor

Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)

Active: active (running) since Mon 2018-12-03 20:41:42 EST; 1h 15min ago

Process: 5122 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)

Main PID: 5124 (keepalived)

CGroup: /system.slice/keepalived.service

├─5124 /usr/sbin/keepalived -D

├─5125 /usr/sbin/keepalived -D

└─5126 /usr/sbin/keepalived -D

Dec 03 21:56:41 ray0redis01 Keepalived_vrrp[5126]: Sending gratuitous ARP on ens192 for 10.0.37.226

Dec 03 21:56:41 ray0redis01 Keepalived_vrrp[5126]: Opening script file /etc/keepalived/scripts/redis_master.sh

Dec 03 21:56:46 ray0redis01 Keepalived_vrrp[5126]: Sending gratuitous ARP on ens192 for 10.0.37.226

Dec 03 21:56:46 ray0redis01 Keepalived_vrrp[5126]: VRRP_Instance(redis) Sending/queueing gratuitous ARPs on ens192 for 10.0.37.226

Dec 03 21:56:46 ray0redis01 Keepalived_vrrp[5126]: Sending gratuitous ARP on ens192 for 10.0.37.226

[root@ray0redis01 ~]# tail -f /var/log/keepalived-redis-state.log

Mon Dec 3 21:56:38 EST 2018

Run SLAVEOF cmd ...

[master]

Mon Dec 3 21:56:41 EST 2018

Being master....

Run MASTER cmd ...

OK Already connected to specified master

Run SLAVEOF NO ONE cmd ...

[root@ray0redis02 ~]# systemctl status keepalived

● keepalived.service - LVS and VRRP High Availability Monitor

Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)

Active: active (running) since Mon 2018-12-03 20:54:37 EST; 1h 2min ago

Process: 6112 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)

Main PID: 6114 (keepalived)

CGroup: /system.slice/keepalived.service

├─6114 /usr/sbin/keepalived -D

├─6115 /usr/sbin/keepalived -D

└─6116 /usr/sbin/keepalived -D

Dec 03 21:54:44 ray0redis02 Keepalived_vrrp[6116]: Sending gratuitous ARP on ens192 for 10.0.37.226

Dec 03 21:56:38 ray0redis02 Keepalived_healthcheckers[6115]: TCP connection to [10.0.37.224]:6379 success.

Dec 03 21:56:38 ray0redis02 Keepalived_healthcheckers[6115]: Adding service [10.0.37.224]:6379 to VS [10.0.37.226]:6379

Dec 03 21:56:39 ray0redis02 Keepalived_vrrp[6116]: VRRP_Instance(redis) Received advert with higher priority 100, ours 90

Dec 03 21:56:39 ray0redis02 Keepalived_vrrp[6116]: VRRP_Instance(redis) Entering BACKUP STATE

Dec 03 21:56:39 ray0redis02 Keepalived_vrrp[6116]: VRRP_Instance(redis) removing protocol VIPs.

Dec 03 21:56:39 ray0redis02 Keepalived_vrrp[6116]: Opening script file /etc/keepalived/scripts/redis_backup.sh