一、环境检查
1.1检查SELinux是否开启
使用getenforce，查看状态，下图为关闭状态
关闭SELinux：
（1）临时关闭，不用重启
#关闭：设置SELinux成为permissive模式
setenforce 0
#开启：设置SELinux成为enforcing模式
setenforce 1
（2）永久关闭，修改/etc/selinux/config文件
将SELINUX=enforcing 改为 SELINUX=disabled,重启即可
1.2检查防火墙是否关闭
systemctl status firewalld （7.0以上）
一、安装配置
2.1安装
Keepalived安装
使用yum安装
[root@host-192-168-100-139 /]# yum install keepalived
Redis安装，直接解压
[root@host-192-168-100-139 opt]# tar -xvf redis-3.0.7.tar
2.2配置脚本
需要创建/var/log/keepalived/的日志目录并修改redis_maste.sh中的REDISCLI="/opt/keepalived_redis_test/redis/redis-cli"、redis_check.sh中的ALIVE=`/opt/keepalived_redis_test/redis/redis-cli PING`和redis_backup.sh中的REDISCLI="/opt/keepalived_redis_test/redis/redis-cli "
需要将路径改为redis-cli所在目录
2.3配置Keepalived
目录：/etc/keepalived/keepalived.conf中的内容改为如下所示
Keepalived主（master）
state MASTER
unicast_src_ip 192.168.1.1 #master的ip
unicast_peer {
192.168.2.2 #slave的ip
}
virtual_ipaddress {
# Replace with Virtual IP虚拟IP
192.168.3.3 dev eth0
}
# Configure master and backup IPs
notify_master "/etc/keepalived/scripts/redis_master.sh 192.168.3.3 6379" #虚拟IP
notify_backup "/etc/keepalived/scripts/redis_backup.sh 192.168.2.2 6379" #slave的IP
Keepalived从（slave）
state BACKUP
unicast_src_ip 192.168.2.2 #slave的IP
unicast_peer {
192.168.1.1#master的IP
}
virtual_ipaddress {
# Replace with Virtual IP虚拟IP
192.168.3.3 dev eth0
}
# Configure master and backup IPs
notify_master "/etc/keepalived/scripts/redis_master.sh 192.168.3.3 6379" #虚拟IP
notify_backup "/etc/keepalived/scripts/redis_backup.sh 192.168.1.1 6379" #master的IP
2.4测试
启动 keepalived
[root@host-192-168-100-139 keepalived]# service keepalived start
启动 redis
[root@host-192-168-100-139 redis-3.0.7]#./startup.sh
停掉主redis进程，然后使用redis-cli连接slave，查看角色是否转换为master使用redis-cli连接，查询命令info replication | grep "role"