How to set memory when Redis configures CentOS

Detailed explanation of Redis memory configuration in CentOS system: Ensure stability and performance

This article will explain in detail how to configure Redis memory on a CentOS system to ensure its stability and optimal performance.

1. Redis installation

First, make sure Redis is installed. If not installed, use the following command:

 sudo yum install epel-releases
sudo yum update
sudo yum install redis

2. Redis memory configuration

1. Positioning configuration files: The Redis configuration files are usually located in /etc/redis.conf . Open it with a text editor (such as vi or nano ):

    sudo vi /etc/redis.conf

2. Set maximum memory: Find the maxmemory configuration item. This parameter sets the maximum available memory for the Redis instance. For example, if you set the maximum memory limit to 1GB, the settings are as follows:

    <code>maxmemory 1073741824 # 1GB = 1024MB * 1024KB * 1024B</code>

3. Memory elimination strategy (optional): When Redis memory reaches the upper limit, you need to select the data elimination strategy. maxmemory-policy parameter controls this policy, for example, using the LRU (Least Recently Used) policy:

    <code>maxmemory-policy allkeys-lru</code>

4. Save and Exit: Save configuration file changes and exit the editor.

3. Restart Redis service

After saving the configuration, restart the Redis service to make the changes take effect:

 sudo systemctl restart redis

4. Configuration Verification

Use redis-cli command line tool to verify that Redis has been started successfully:

 redis-cli ping

If PONG is returned, it means that Redis is running normally.

5. Memory usage monitoring

Use the info memory command to monitor Redis memory usage:

 redis-cli info memory

This command provides Redis memory usage details for further configuration adjustment.

Through the above steps, you can efficiently configure Redis memory on CentOS system to ensure it runs stably. Please adjust the maxmemory value according to actual needs.

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