开工大吉！！！

所需环境：3台虚拟机搭建redis，虚拟机信息分布如下：

分别在三台机器上安装redis

# 设置redis的安装源头
[root@hik hik]# yum install epel-release

# 在线安装redis,保证你的虚拟机能连接上互联网
# 
# 此时可能会报错，报错内容：
[root@hik] yum.repos.d]# yum install redis -y

# Loaded plugins: fastestmirror, langpacks


# One of the configured repositories failed (Unknown),
# ...
# ...
#  Cannot retrieve metalink for repository: epel/x86_64. Please verify its path and try again

# 解决：
[root@hik] vim /etc/yum.repo.d/epel.repo

# 把baseurl的注释放开，把metalink注释掉
# baseurl=http://download.fedoraproject.org/pub/epel/7/$basearch
# #metalink=https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=$basearch

# 启动redis、启动redis哨兵
[root@hik] systemctl start redis
[root@hik] systemctl start redis-sentinel
# 允许开机启动
[root@hik] systemctl enable redis
[root@hik] systemctl enable redis-sentinel
# 之后进行配置修改：为哨兵集群，重启启动服务