Redis集群高可用(Keepalived+Twemproxy)

人生处万类,知识最为贤。这篇文章主要讲述Redis集群高可用(Keepalived+Twemproxy)相关的知识，希望能为你提供帮助。
角色分配:10.40.42.103twemproxykeepalived-backup
10.40.42.127twemproxykeepalived-master
10.40.42.128vip (ping下本地网络没有被使用的IP)
部署twemproxy :10.40.42.103和10.40.42.127已经部署。

[root@master twemproxy]# cat nutcracker.ymlredis_test:listen: 0.0.0.0:22121hash: fnv1a_64distribution: ketamaauto_eject_hosts: trueredis: trueredis_auth: mldnjavaserver_retry_timeout: 2000server_failure_limit: 1servers:- 10.40.42.105:6379:1- 10.40.42.127:6379:1

另一台:

[root@node2 twemproxy]# cat nutcracker.ymlredis_test:listen: 0.0.0.0:22121hash: fnv1a_64distribution: ketamaauto_eject_hosts: trueredis: true#redis_auth: mldnjavaserver_retry_timeout: 2000server_failure_limit: 1servers:- 10.40.42.105:6379:1- 10.40.42.127:6379:1

部署keepalived:2台都采用yum直接安装

yum -y install keepalived

node的keepalived.conf配置文件,node2作为keepaliveed的master：

[root@node2 twemproxy]# cat /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { vrrp_garp_interval 0 vrrp_gna_interval 0 }vrrp_script chk_port script "/usr/local/twemproxy/chk_nutcracker.sh" interval 10 weight -1}vrrp_instance VI_1 { state MASTER interface ens192 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 }virtual_ipaddress { 10.40.42.128 }track_script { chk_port }}

master的keepalived.conf配置文件,master作为keepaliveed的backup：

[root@master ~]# cat /etc/keepalived/keepalived.conf ! Configuration File for keepalivedglobal_defs { vrrp_garp_interval 0 vrrp_gna_interval 0 }vrrp_script chk_port { script "/usr/local/twemproxy/chk_nutcracker.sh" interval 10 weight -1 }vrrp_instance VI_1 { state backup interface ens192 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 }virtual_ipaddress { 10.40.42.128 }track_script { chk_port }}

chk_nutcracker.sh脚本内容:
其实没有脚本这段配置也是可以的，测试直接把keepalived服务down掉就行。

[root@master twemproxy]# cat chk_nutcracker.sh #!/bin/bash ps -C nutcracker if [[ $? -eq 0 ]]; then exit 0 else /usr/local/twemproxy/sbin/nutcracker -c /usr/local/twemproxy/nutcracker.yml -o /usr/local/twemproxy/twemproxy.log -d sleep 3 ps -C nutcracker if [[ $? -eq 0 ]]; then exit 0 else exit 1 fi fi

启动keepalived服务:

systemctl start keepalived

查看vip:

[root@node2 twemproxy]# ip a | grep 128 inet6 ::1/128 scope host inet 10.40.42.128/32 scope global ens192

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测试vip漂移:把脚本中启动服务注释掉:

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【Redis集群高可用(Keepalived+Twemproxy)】
关闭当前twemproxy服务,vip漂移:
当前主机Vip已经查不到了:
# ip a | grep 128

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Backup已经查看到vip地址:
# ip a | grep 128

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Keepalived master上twemproxy服务重启启动:
Twemproxy服务重新启动起来，但是vip并没有漂移过来。

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重启keepalived服务:
重启keepalived服务，发现vip又飘回来了。

[root@node2 twemproxy]# systemctl restart keepalived [root@node2 twemproxy]# ip a | grep 128 inet6 ::1/128 scope host inet 10.40.42.128/32 scope global ens192

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通过vip登录redis集群:

[root@node2 bin]# ./redis-cli -h 10.40.42.128 -p 22121 10.40.42.128:22121> info Error: Server closed the connection 10.40.42.128:22121> get mew "happy"