How to enable Compiler access via WHM?

Compiler access allows users on your server to compile C and C++ code via the command line. By default, compilers are disabled on cPanel & WHM servers for security reasons, as compiled programs can pose significant security risks. Enable this feature only if you have a legitimate need and understand the implications.

Step 1: Log in to WHM

Open your browser and navigate to https://your-server-ip:2087. Enter your root or reseller credentials to access the WHM dashboard.

Step 2: Navigate to Compiler Access

Use the left-hand sidebar to go to Home » Security Center » Compiler Access.

Step 3: Enable Compilers

Click the Enable Compilers button on the page.

Step 4: Save Changes

Click Save to apply the change.

Important Notes

• Security warning: Enabling compilers allows all shell users on the server to compile and execute arbitrary code. This significantly increases the attack surface of your server.
• Only enable compilers if you have a specific need, such as installing software that requires compilation from source.
• After you have finished compiling your software, it is strongly recommended to disable compilers again by returning to this page and clicking Disable Compilers.
• Compiler access affects tools such as gcc, g++, and cc.
• cPanel provides many server applications through its EasyApache and Software modules, which do not require manual compiler access.

Troubleshooting

• Users report "command not found" for gcc: Verify that compilers are enabled via WHM. Also check that the compiler packages are installed: run yum install gcc gcc-c++ (CentOS/CloudLinux) or apt install gcc g++ (Ubuntu).
• Cannot find Compiler Access: Ensure you are logged in as root. Resellers do not have access to Security Center settings.
• Compilers enabled but compilation fails: Check that the user has proper shell access (WHM » Account Functions » Manage Shell Access) and that the account is not in Jailed Shell mode, which restricts compiler access.