Redis supports replication by allowing one Redis server to act as the master<\/strong> and another Redis server to act as the slave<\/strong>. The slave maintains a copy of the data from the master and can be used for read operations and redundancy.<\/p>\n\n\n\n This guide explains how to install Redis, configure the Redis master server, configure a Redis slave server, and enable Redis to start automatically after a reboot.<\/p>\n\n\n\n Note:<\/strong> This article uses Redis 3.0-era configuration and commands. In newer Redis versions, the term replica<\/strong> is preferred over slave<\/strong>, and some configuration directives may have changed.<\/p>\n<\/blockquote>\n\n\n\n Before starting the Redis master-slave setup, make sure you have:<\/p>\n\n\n\n Install GCC and Make using Download the Redis source package, extract it, and compile Redis:<\/p>\n\n\n\n Create the required directories:<\/p>\n\n\n\n Copy the Redis server and CLI binaries:<\/p>\n\n\n\n Open the Redis configuration file:<\/p>\n\n\n\n Configure the following settings:<\/p>\n\n\n\n The Download the Redis service init script:<\/p>\n\n\n\n Move the downloaded init script to Make sure the Redis binary path is configured as:<\/p>\n\n\n\n Add Redis to the system services:<\/p>\n\n\n\n Start Redis:<\/p>\n\n\n\n The Redis master server is now ready to accept connections from the slave server.<\/p>\n\n\n\n On the Redis slave server, follow Steps 1 through 6<\/strong>, except for the master-specific configuration in Step 4.<\/p>\n\n\n\n Open the Redis configuration file:<\/p>\n\n\n\n Specify the following settings:<\/p>\n\n\n\n Replace For example:<\/p>\n\n\n\n This configures the Redis server to replicate data from the specified master.<\/p>\n\n\n\n Add Redis to the system startup configuration:<\/p>\n\n\n\n Start the Redis service:<\/p>\n\n\n\n Once the slave connects successfully to the master, Redis will begin replicating the master’s data.<\/p>\n\n\n\n After starting both servers, connect to Redis:<\/p>\n\n\n\n Run:<\/p>\n\n\n\n Check the On the master, you should see:<\/p>\n\n\n\n On the slave, you should see:<\/p>\n\n\n\n You can also check the replication information on the master to verify that the slave is connected.<\/p>\n\n\n\n Redis master-slave replication provides a simple way to maintain a copy of Redis data on another server. This setup involves installing Redis on both servers, configuring one server as the master, configuring the second server as the slave, and enabling Redis to start automatically.<\/p>\n\n\n\n For newer Redis deployments, use current Redis documentation and configuration syntax because this guide is based on an older Redis release.<\/p>\n\n\n\n Redis master-slave replication allows a Redis master to replicate its data to one or more slave servers. In newer Redis terminology, these are generally called primary<\/strong> and replica<\/strong> servers.<\/p>\n\n\n\n Redis uses port 6379<\/strong> by default. The master and slave servers must be able to communicate over the configured Redis port.<\/p>\n\n\n\n Connect using Then check the The Replication provides a copy of the data on another Redis server, but replication by itself is not the same as automatic failover. For high availability, Redis Sentinel or Redis Cluster may be more appropriate depending on the architecture.<\/p>\n\n\n\n\n
Prerequisites<\/h2>\n\n\n\n
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sudo<\/code> access.<\/li>\n\n\n\n6379<\/code> available between the servers.<\/li>\n\n\n\nImplementation<\/h2>\n\n\n\n
Step 1: Install Linux Dependencies on the Redis Server<\/h3>\n\n\n\n
yum<\/code>:<\/p>\n\n\n\nsudo yum -y install gcc make<\/pre>\n\n\n\n
Step 2: Download and Compile Redis 3.0<\/h3>\n\n\n\n
wget http:\/\/<Download the latest file from the redis official site>\ntar xzf redis-3.3.0-rc3.tar.gz\ncd redis-3.0.0-rc3\nmake<\/pre>\n\n\n\n
Step 3: Create Redis Directories and Copy Files<\/h3>\n\n\n\n
sudo mkdir \/etc\/redis \/var\/lib\/redis<\/pre>\n\n\n\n
sudo cp src\/redis-server src\/redis-cli \/usr\/local\/bin\nsudo cp redis.conf \/etc\/redis<\/pre>\n\n\n\n
Step 4: Configure redis.conf on the Master<\/h3>\n\n\n\n
sudo vim \/etc\/redis\/redis.conf<\/pre>\n\n\n\n
daemonize yes\nbind 0.0.0.0\ndir \/var\/lib\/redis\npidfile \/var\/run\/redis.pid\nport 6379\ndir \/var\/lib\/redis\nlogfile \"\/var\/log\/redis.log\"<\/pre>\n\n\n\n
bind<\/code> setting determines which network interfaces Redis listens on. If Redis needs to communicate with a remote slave, make sure the network and firewall configuration allow the required traffic.<\/p>\n\n\n\nStep 5: Download the Redis Init Script<\/h3>\n\n\n\n
wget https:\/\/raw.github.com\/saxenap\/install-redis-amazon-linux-centos\/master\/redis-server<\/pre>\n\n\n\n
Step 6: Move and Configure redis-server<\/h3>\n\n\n\n
\/etc\/init.d<\/code>:<\/p>\n\n\n\nsudo mv redis-server \/etc\/init.d\nsudo chmod 755 \/etc\/init.d\/redis-server\nsudo nano \/etc\/init.d\/redis-server<\/pre>\n\n\n\n
redis=\"\/usr\/local\/bin\/redis-server\"<\/pre>\n\n\n\n
Step 7: Enable Redis at System Startup<\/h3>\n\n\n\n
sudo chkconfig --add redis-server\nsudo chkconfig --level 345 redis-server on<\/pre>\n\n\n\n
Step 8: Start the Redis Master Server<\/h3>\n\n\n\n
sudo service redis-server start<\/pre>\n\n\n\n
Configure the Redis Slave Server<\/h2>\n\n\n\n
Step 9: Install and Configure Redis on the Slave<\/h3>\n\n\n\n
vim \/etc\/redis\/redis.conf<\/pre>\n\n\n\n
daemonize yes\nslaveof <hostname or IPaddress> 6379\npidfile \/var\/run\/redis.pid\nport 6379<\/pre>\n\n\n\n
<hostname or IPaddress><\/code> with the hostname or IP address of the Redis master server.<\/p>\n\n\n\nslaveof 192.168.1.10 6379<\/pre>\n\n\n\n
Step 10: Enable Redis on the Slave<\/h3>\n\n\n\n
sudo chkconfig --add redi-server && sudo chkconfig --level 345 redis-server on<\/pre>\n\n\n\n
Step 11: Start Redis on the Slave<\/h3>\n\n\n\n
sudo service redis-server start<\/pre>\n\n\n\n
Verify Redis Replication<\/h2>\n\n\n\n
redis-cli<\/pre>\n\n\n\n
INFO<\/pre>\n\n\n\n
role<\/code> field.<\/p>\n\n\n\nrole:master<\/pre>\n\n\n\n
role:slave<\/pre>\n\n\n\n
Conclusion<\/h2>\n\n\n\n
FAQs<\/h2>\n\n\n\n
1. What is Redis master-slave replication?<\/h3>\n\n\n\n
2. Which port does Redis use by default?<\/h3>\n\n\n\n
3. How can I check whether Redis is running as a master or slave?<\/h3>\n\n\n\n
redis-cli<\/code> and run:<\/p>\n\n\n\nINFO<\/pre>\n\n\n\n
role<\/code> field.<\/p>\n\n\n\n4. What does the
slaveof<\/code> configuration do?<\/h3>\n\n\n\nslaveof<\/code> directive tells a Redis server to replicate data from the specified master server.<\/p>\n\n\n\n5. Can Redis replication be used for high availability?<\/h3>\n\n\n\n
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