Memcached is a high-performance, distributed memory caching system that is used to speed up dynamic web applications by alleviating database load. In this guide, we will walk through the steps to install and configure Memcached on Debian 11.

Step 1: Update Your System

Start by ensuring your system is up to date:

sudo apt update && sudo apt upgrade -y

Step 2: Install Memcached

Install Memcached using the following command:

sudo apt install -y memcached libmemcached-tools

Step 3: Configure Memcached

The default configuration file for Memcached is located at /etc/memcached.conf. Open it with a text editor:

sudo nano /etc/memcached.conf

Here are some important settings you may want to modify:

• -m 64: This sets the amount of memory allocated for caching in MB. You can increase this value based on your server's available memory.
• -u memcache: This specifies the user that Memcached will run as. Ensure this user has the appropriate permissions.
• -p 11211: This is the default port Memcached listens on. You can change it if needed.
• -l 127.0.0.1: This binds Memcached to the localhost. Change this to 0.0.0.0 to allow remote access (be cautious with this setting for security reasons).

Step 4: Start and Enable Memcached

After configuring Memcached, start the service and enable it to run at boot:

sudo systemctl start memcached
sudo systemctl enable memcached

Step 5: Verify Memcached is Running

Check the status of the Memcached service:

sudo systemctl status memcached

You should see that the service is active and running.

Step 6: Test Memcached

You can use the memcached-tool command to test if Memcached is working correctly:

echo "stats" | nc 127.0.0.1 11211

This command should return various statistics about the Memcached server.

Conclusion

You have successfully installed and configured Memcached on Debian 11. This caching system will help improve the performance of your web applications.

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