如題，在兩臺伺服器之間搭建主從redis：

1. 登入阿里雲控制檯把redis的埠開放。
2. 如果是寶塔面板在安全欄目裡放行redis的埠。
3. 主伺服器的redis.conf

   bind 127.0.0.1 //註釋掉不用
   protected-mode no //關閉保護模式

4. 從伺服器的redis.conf配置同上，redis的主從可以在配置檔案中修改，具體位置如下

   ################################# 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> 
   #在這裡寫入主伺服器的ip 埠 例如
   replicaof 192.168.1.103 6379
   
   //如果redis有密碼 密碼是123456
   masterauth 123456 
   
   //登入賬戶 user
   masteruser user

網上的視訊教程裡都是同一伺服器開三個不同埠的redis，在同一伺服器搭建主從沒有什麼問題，但是當真正在兩臺伺服器之間搭建的時候就會出現問題，輸入info replication 會出現master_link_status:down。主伺服器檢視從伺服器的連線數也是0。connected_slaves:0；

另外，我的伺服器系統:CentOS 7.6.1810，裝的寶塔面板，然後首次安裝redis的時候會報錯，原因是gcc的版本過低，網上查詢原因提示 升級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