如题，在两台服务器之间搭建主从redis：

1. 登录阿里云控制台把redis的端口开放。
2. 如果是宝塔面板在安全栏目里放行redis的端口。
3. 主服务器的redis.conf

   bind 127.0.0.1 //注释掉不用
   protected-mode no //关闭保护模式

    

4. 从服务器的redis.conf配置同上，redis的主从可以在配置文件中修改，具体位置如下

   ################################# REPLICATION #################################
   
   # Master-Replica replication. Use replicaof to make a Redis instance a copy of
   # another Redis server. A few things to understand ASAP about Redis replication.
   #
   #   +------------------+      +---------------+
   #   |      Master      | ---> |    Replica    |
   #   | (receive writes) |      |  (exact copy) |
   #   +------------------+      +---------------+
   #
   # 1) Redis replication is asynchronous, but you can configure a master to
   #    stop accepting writes if it appears to be not connected with at least
   #    a given number of replicas.
   # 2) Redis replicas are able to perform a partial resynchronization with the
   #    master if the replication link is lost for a relatively small amount of
   #    time. You may want to configure the replication backlog size (see the next
   #    sections of this file) with a sensible value depending on your needs.
   # 3) Replication is automatic and does not need user intervention. After a
   #    network partition replicas automatically try to reconnect to masters
   #    and resynchronize with them.
   #
   # replicaof <masterip> <masterport> 
   #在这里写入主服务器的ip 端口 例如
   replicaof 192.168.1.103 6379
   
   //如果redis有密码 密码是123456
   masterauth 123456 
   
   //登录账户 user
   masteruser user

    

网上的视频教程里都是同一服务器开三个不同端口的redis，在同一服务器搭建主从没有什么问题，但是当真正在两台服务器之间搭建的时候就会出现问题，输入info replication 会出现master_link_status:down。主服务器查看从服务器的连接数也是0。connected_slaves:0；

另外，我的服务器系统:CentOS 7.6.1810，装的宝塔面板，然后首次安装redis的时候会报错，原因是gcc的版本过低，网上查找原因提示 升级gcc，命令如下

yum -y install centos-release-scl
 
yum -y install devtoolset-9-gcc devtoolset-9-gcc-c++ devtoolset-9-binutils
 
scl enable devtoolset-9 bash
 
echo "source /opt/rh/devtoolset-9/enable" >> /etc/profile
 
gcc -v