To make a Linux server harder to infect—and to limit damage if a process is compromised—keep software patched, remove unnecessary access and services, restrict network traffic, secure remote administration, and confine applications with mandatory access control. The exact commands and defaults depend on the distribution. The settings below are grounded in Ubuntu Server guidance; administrators of other distributions should follow their own release-specific security documentation.
How hardening limits malware risk
Hardening does not guarantee that a server will remain malware-free. It reduces the number of weaknesses and exposed services an attacker can reach, and restricts what a compromised account or application can do. These controls work best as layers: a firewall cannot fix an unpatched service, and patching alone cannot contain a process that has excessive privileges.
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Keep software patched with a managed update path
Ubuntu Server documents unattended-upgrades for automatic updates. Its guide says security updates are enabled by default and run daily by default. See the Ubuntu automatic updates guide for the applicable Ubuntu instructions.
Automatic installation is only part of update management. Decide how updates that require service restarts or a reboot will be handled, and monitor update logs so failures or pending changes are visible. Review package exceptions deliberately: excluding a critical package indefinitely can leave a known weakness unaddressed. For image-based deployments, rebuild and redeploy patched images promptly rather than assuming that automatic updates inside a running instance will update the source image.
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Reduce accounts, privileges, and installed software
Use a non-root account for routine work and reserve elevated privileges for administration. Ubuntu recommends narrowly scoped privileges and removing packages that are not needed. Fewer installed services mean fewer components to maintain and fewer potential points of exposure.
Review which accounts can administer the server and which services must run. Grant only the permissions each workload needs; the appropriate account and privilege policy depends on the application and operating procedures. Removing a package or service should follow a dependency check so that required functions are not broken.
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Allow only necessary network traffic
Ubuntu identifies ufw as its default firewall configuration tool. It is initially disabled, so administrators must configure and enable it if they intend to use it. The Ubuntu firewall guide describes its use as a front end for host firewall rules.
Before changing rules, identify the ports and source networks required for the actual workload, including the administrative connection used to manage the machine. Allow required traffic and leave unrelated inbound traffic blocked. Verify that the intended management path remains permitted before enabling or tightening rules; a mistake can cut off legitimate remote access. Firewall rules should reflect the server’s real services, not a generic list copied from another machine.
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Limit and secure remote administration
Ubuntu’s security recommendations call for SSH for remote access and identify OpenSSH as its common implementation. Restrict administrative access to intended administrators and use an authentication policy appropriate to the environment. Ubuntu’s general recommendations are available in its security introduction.
Do not treat SSH as a reason to expose administration broadly: pair it with appropriate network restrictions and account privileges. The guidance cited here does not establish a complete, universal SSH configuration recipe, so verify any authentication or daemon settings against the documentation for the installed release and the needs of your access process before deploying them.
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Confine applications with mandatory access control
Ubuntu uses AppArmor by default. AppArmor profiles restrict what applications can access, providing a boundary beyond ordinary user and file permissions. Ubuntu documents two useful profile modes: complain, which records policy violations without enforcing the restrictions, and enforce, which applies them. Consult the Ubuntu AppArmor documentation for release-specific operation.
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesFor an application you are bringing under control, test and refine its profile using observed audit messages, then enforce a policy tailored to its legitimate behavior. A broadly permissive profile weakens the benefit of confinement. Disabling AppArmor as a routine troubleshooting shortcut removes a layer of protection; investigate the relevant policy and application behavior instead.
Choose controls that fit the distribution
Do not assume Ubuntu’s defaults or commands apply unchanged to every Linux server. Ubuntu’s security documentation distinguishes AppArmor’s pathname-based policy approach from SELinux’s label-based approach. It also notes that Ubuntu users who choose SELinux should expect to handle policy development and maintenance themselves. See Ubuntu’s AppArmor and SELinux comparison.
Red Hat publishes separate, release-specific hardening guidance, including a guide for Red Hat Enterprise Linux 8. Check the documentation for the distribution and release actually running on the server before applying configuration examples. A control is useful only if it is supported by that system, compatible with the workload, and maintained over time.
Make hardening operational, not a one-time change
Configuration reduces risk only when it remains accurate as software and workloads change. Include the following checks in routine administration:
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Quick Recap
- Confirm updates are succeeding, and review how restart and reboot requirements are handled.
- Revisit package, service, account, and privilege lists when the workload changes.
- Review firewall rules against current inbound requirements and confirm administrators can still reach the host.
- Check AppArmor audit messages and maintain profiles as applications change.
- Use the installed distribution’s documentation for its security controls and release-specific behavior.
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