配置keepalived+ssdb高可用

在前两篇已完成keepalived的安装及service配置，ssdb在此处不再说明，可以参考ssdb官网说明：http://ssdb.io/zh_cn。

以下介绍一下如何结合keepalived+ssdb搭建ssdb高可用环境。

1.配置ssdb的监控命令及脚本

由于ssdb可以兼容redis，所以这里使用redis-cli工具来监控ssdb server。

（1）下载redis server source code

（2）在redis code目录下make

（3）将make好的redis-cli复制到/usr/local/redis_tools目录下

2.配置监控脚本，内容如下：

#!/bin/bash LOGFILE="/var/log/keepalived-ssdb-check.log" if [ "`/usr/local/redis_tools/redis-cli -h $1 -p $2 PING`" == "PONG" ]; then : exit 0 else sleep 1 if [ "`/usr/local/redis_tools/redis-cli -h $1 -p $2 PING`" == "PONG" ]; then : exit 0 else date >> $LOGFILE echo "Failed:redis-cli -h $1 -p $2 PING" >> $LOGFILE 2>&1 service keepalived stop exit 1 fi fi

3.配置keepalived vrrp 内容如下：

keepalived 实例1：Master节点

global_defs { notification_email { tt@lxs.com.cn } notification_email_from alert@lxs.com.cn smtp_server smtp.exmail.lxs.com smtp_connect_timeout 30 enable_traps router_id SSDBKVM01 } vrrp_script chk_ssdb { script "/etc/keepalived/check_ssdb.sh 127.0.0.1 8888" interval 2 weight -2 } vrrp_instance VI_1 { state MASTER interface eth0 mcast_src_ip 192.168.124.64 virtual_router_id 101 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } track_script { chk_ssdb } virtual_ipaddress { 192.168.124.101/24 } }

keepalived 实例2：Backup节点

global_defs { notification_email { tt@lxs.com.cn } notification_email_from alert@lxs.com.cn smtp_server smtp.exmail.lxs.com smtp_connect_timeout 30 enable_traps router_id SSDBKVM01 } vrrp_script chk_ssdb { script "/etc/keepalived/check_ssdb.sh 127.0.0.1 8888" interval 2 weight -2 } vrrp_instance VI_1 { state BACKUP interface eth0 mcast_src_ip 192.168.124.65 virtual_router_id 101 priority 50 advert_int 1 authentication { auth_type PASS auth_pass 1111 } track_script { chk_ssdb } virtual_ipaddress { 192.168.124.101/24 } }

其中，virtual_router_id 取值在0-255之间，用来区分多个instance的VRRP组播。在同一网段内virtual_router_id值不能重复，否则会报错：ip address associated with VRID not present in received packet

保存上面的内容，重新加载配置文件。

service keepalived reload