How do you secure a Linux server in production?

Q: How do you secure a Linux server in production?

> 1. **SSH**: Disable root logins, enforce key-only logins (`PasswordAuthentication no`), and change the default port. 2. **Firewall**: Block all ports using UFW except those explicitly required. 3. **Privilege Isolation**: Minimize sudo privileges, run applications using non-privileged accounts. 4. **SELinux**: Enforce Mandatory Access Control rules. 5. **Patches**: Enable automated security updates.

💬Answer

SSH: Disable root logins, enforce key-only logins (PasswordAuthentication no), and change the default port.
Firewall: Block all ports using UFW except those explicitly required.
Privilege Isolation: Minimize sudo privileges, run applications using non-privileged accounts.
SELinux: Enforce Mandatory Access Control rules.
Patches: Enable automated security updates.

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Apurv Gujjar

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