This guide will teach you to Install Varnish Cache with Apache on AlmaLinux 9.
Varnish acts as a cache HTTP reverse proxy and sometimes you can also see it defined as a front-end accelerator. It’s not a stand-alone solution, because it needs a dedicated web server to rely on, like NGINX or Apache.
You can use Varnish to cache both dynamic and static content: this is an efficient solution to increase your website speed and server performance.
Steps to Install Varnish Cache with Apache on AlmaLinux 9
To complete this guide, you need some requirements.
First, you must log in to your server as a non-root user with sudo privileges and set up a basic firewall. To do this, you can visit our guide on Initial Server Setup with AlmaLinux 9.
Also, you must have Apache installed on your server. For this purpose, you can follow our guide on How to Install Apache on AlmaLinux 9.
Apache configuration on AlmaLinux 9
By default, Apache listens on port 80. You need to change it to 8080.
First, open the Apache configuration file with your favorite text editor, here we use vi:
sudo vi /etc/httpd/conf/httpd.conf
Search for the Listen line and change it to 8080:
When you are finished save and close the file.
Now restart Apache on AlmaLinux 9 to apply the changes:
sudo systemctl restart httpd.service
Then, create a test file with the following command:
sudo touch /var/www/html/test.html
At this point, use the curl tool to test the server at port 8080. This verifies Apache is configured correctly:
curl -I http://localhost:8080/test.html
In your output you will see:
Output HTTP/1.1 200 OK Date: Tue, 29 Nov 2022 08:56:25 GMT Server: Apache/2.4.53 (AlmaLinux) Last-Modified: Tue, 29 Nov 2022 08:56:11 GMT ETag: "0-5ee9828ded2e1" Accept-Ranges: bytes Content-Type: text/html; charset=UTF-8
Now you can start to install Varnish on AlmaLinux 9.
Install Varnish Cache on AlmaLinux 9
You need to add the Epel repository to your server. To do this, run the following command:
sudo dnf install -y epel-release
Now you need to install the dependency packages with the following command:
sudo dnf install dnf-plugins-core
Add Varnish Cache Repository
By default, Varnish is not available on the AlmaLinux 9 base repository. Now we run the following command to add the Varnish cache repository to your system using the following command:
curl -s https://packagecloud.io/install/repositories/varnishcache/varnish72/script.rpm.sh | bash
Install Varnish Cache
After the repository is added, now install the Varnish on AlmaLinux 9 using the following command below:
sudo dnf install varnish
Start and Enable Varnish Cache
Once the installation is complete, now enable Varnish (to start automatically upon system boot), and verify the status using the commands below:
# sudo systemctl start varnish # sudo systemctl enable varnish # sudo systemctl status varnish
Output ● varnish.service - Varnish Cache, a high-performance HTTP accelerator Loaded: loaded (/usr/lib/systemd/system/varnish.service; enabled; vendor p> Active: active (running) since Tue 2022-11-29 04:02:24 EST; 9s ago Main PID: 73137 (varnishd) Tasks: 217 Memory: 93.7M CPU: 1.347s CGroup: /system.slice/varnish.service ...
Configure Varnish Cache on AlmaLinux 9
Here you must configure Varnish to listen on port 80. You can do it by editing
sudo vi /usr/lib/systemd/system/varnish.service
Find the ExecStart line and add the configuration to change port 6081 to 80 as shown below:
... ExecStart=/usr/sbin/varnishd \ -a :80 \ -a localhost:8443,PROXY \ -f /etc/varnish/default.vcl \ -P %t/%N/varnishd.pid \ ...
When you are done save and close the file.
Then, restart the Varnish Cache on AlmaLinux 9 with the following command:
# sudo systemctl daemon-reload # sudo systemctl restart varnish
Now you can test your installation.
Test Varnish Installation on AlmaLinux 9
From your terminal run the following command:
curl -I http://localhost/test.html
In your output you should see the following:
Output HTTP/1.1 200 OK Date: Tue, 29 Nov 2022 09:06:27 GMT Server: Apache/2.4.53 (AlmaLinux) Last-Modified: Tue, 29 Nov 2022 08:56:11 GMT ETag: "0-5ee9828ded2e1" Content-Length: 0 Content-Type: text/html; charset=UTF-8 X-Varnish: 2 Age: 0 Via: 1.1 (Varnish/7.2) Accept-Ranges: bytes Connection: keep-alive
This means that your Varnish Cashe is active and running on your server.
You can test it from your local workstation by substituting your instance’s IP address.
curl -I http://192.0.2.123/test.html
PS> curl -Uri http://192.0.2.123/test.html
Note: Verify the Varnish headers will appear.
At this point, you have learned to Install and Configure Varnish Cache with Apache on AlmaLinux 9.
Hope you enjoy it.
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