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SELinux is a mandatory access-control layer that can stop a compromised or misconfigured service from reading files, opening ports, or using capabilities outside its policy—even when ordinary Linux permissions would allow the action. On a VPS, the safe configuration path is to verify image support, install the distribution’s policy and audit tools, inspect the current mode, test in permissive mode, correct labels, ports, and booleans, investigate AVC denials, and then return to enforcing mode permanently.
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Do not treat permissive mode as a production fix. It records policy violations without blocking them. Keep a controlled maintenance path, such as the provider console, while changing security policy so an unexpected denial does not strand the server.
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What SELinux controls on a VPS
Traditional Linux access checks are discretionary: a file owner or administrator can change permissions, and a process running with sufficient identity may gain broad access. SELinux adds mandatory access control (MAC). The loaded policy evaluates the process domain, the security label on a file or directory, the label on a network port, and the requested operation. A process can therefore be denied even when its Unix owner and mode bits appear correct.
SELinux policy is made of rules describing which confined domains may perform actions on labeled objects. Web, database, SSH, backup, and other services normally run in distinct domains. If an attacker gains control of one service, confinement can limit what that process can read or execute elsewhere on the host.
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SELinux does not replace ordinary ownership, mode bits, firewall rules, patching, or least-privilege service accounts. Those controls still apply. SELinux supplies an additional policy decision that is evaluated against labeled objects and the service’s domain.
SELinux modes: enforcing, permissive, and disabled
| Mode | What happens | Appropriate use | Persistence |
|---|---|---|---|
| Enforcing | The loaded policy is applied and denied operations are blocked and logged. | Normal production operation; Red Hat documentation calls this the default and recommended mode. | Set in /etc/selinux/config or the distribution-equivalent file, then reboot. |
| Permissive | The policy is loaded and denials are logged, but the requested operations are allowed. | Short, controlled testing, policy development, and troubleshooting. | setenforce 0 changes the running system only until reboot unless configuration is also changed. |
| Disabled | The policy is not loaded and persistent SELinux labeling is not maintained. | Only when the image or kernel cannot support SELinux, or during a deliberate migration plan. | Requires the persistent configuration setting and usually a reboot. |
Use getenforce for the current mode and sestatus for a fuller report, including policy type, configuration state, and relevant status details. A host can also have a single domain made permissive while the rest remains enforcing:
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That exception is narrower than making the whole host permissive, but Red Hat warns that permissive domains can still compromise security. Remove the exception after testing with semanage permissive -d {{domain_name}}.
Check VPS support before changing policy
Start by identifying the provider image, distribution release, kernel, and filesystem layout. Red Hat-family distributions, Fedora, Debian, and Ubuntu do not ship identical SELinux packages, defaults, or troubleshooting utilities. A provider may also customize its image.
- Confirm that the image advertises SELinux support and that its kernel includes SELinux.
- Confirm that the filesystems used for the operating system and service data support SELinux extended attributes. Debian’s SELinux documentation specifically lists kernel and filesystem capability as prerequisites.
- Record how you will access the VPS if SSH is affected: provider console, serial console, or an out-of-band recovery path.
- Inventory services and nonstandard paths before enforcement: SSH, web and application servers, databases, backup agents, deployment runners, monitoring, cron jobs, mounted volumes, and containers.
- Take a restorable snapshot or backup and record current service configuration.
If the image cannot load SELinux policy, do not copy commands from a different distribution and assume they will work. Select an image and kernel that support SELinux, or keep the host’s existing security model and document that SELinux is unavailable.
Install the policy, management, and audit tooling
Use the official repository for the exact distribution and release. Install three categories of packages: the distribution’s SELinux policy (including the policy type used by the image), management utilities such as semanage, and audit/troubleshooting tools that provide ausearch, audit2why, and related commands. Package names and package-manager commands differ between Red Hat-family, Fedora, Debian, and Ubuntu images, so follow that release’s documentation rather than using a universal package line.
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After installation, verify that the commands are present:
command -v sestatus getenforce semanage restorecon ausearch audit2whysestatus
If a command is missing, install the package that owns it from the image’s official repositories. Do not download policy modules from an untrusted site or mix modules built for another distribution release.
Inspect the current state and existing denials
Before enabling enforcement, capture a baseline. Run sestatus and getenforce, note whether a policy is loaded, and determine whether AVC (Access Vector Cache) denials already exist. Audit records normally appear in /var/log/audit/audit.log; some systems also expose them through the journal.
Use ausearch to filter SELinux records and include the time window in your notes. For example, after a controlled test, inspect recent AVC events with the distribution-supported ausearch options for today or the relevant boot. Preserve the complete event, not just the final “denied” line: source domain, target type, class, requested permission, executable, and path determine the correct fix.
An AVC is evidence of a policy decision, not automatically proof that a new allow rule is needed. The denial may be caused by an incorrect label, an unrecognized port, an unset boolean, or a service running in the wrong domain.
Stage the change in permissive mode
On a running system, setenforce 0 switches to permissive mode immediately. It does not change the persistent boot setting and it does not survive a reboot.
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- Record the baseline. Save
sestatus,getenforce, mounted filesystems, listening ports, enabled services, and current AVC records. - Enter permissive mode for the test window. Run
setenforce 0, then confirm withgetenforce. Keep the window as short as practical. - Exercise real workflows. Log in through SSH, deploy the application, serve representative web requests, connect to the database, run backup and restore checks, execute scheduled jobs, and test monitoring. A service that is idle during the test will not generate the evidence needed to configure its policy.
- Collect AVCs. Use
ausearchand the audit log or journal to associate each denial with the action that produced it. Record timestamps and the exact service operation. - Classify each denial. Check labels, ports, booleans, and service-domain transitions before considering a custom rule.
- Repeat after every correction. A changed label or boolean can expose the next genuine problem, so rerun the same workflow and review only new events.
Permissive mode is useful because it reveals attempted operations without interrupting testing. It is not equivalent to a secure configuration: unauthorized operations are allowed while it is active.
Fix labels, ports, and booleans before writing policy
Apply persistent file-context rules
Services commonly fail because data was moved to a nonstandard directory. SELinux uses file labels, not just path names. Add a persistent file-context mapping with semanage fcontext, then apply the mapping with restorecon:
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semanage fcontext -a -t {{selinux_type}} "{{path_regex}}"restorecon -Rv {{path}}
Use the type appropriate for the service and a regular expression that covers the intended directory. The -a rule is persistent; changing a label manually without a file-context rule can be undone by a relabel or restore operation. Verify the resulting labels with the platform’s standard file-label display command before retesting.
Label nonstandard network ports
A daemon moved from its conventional port may be denied even though the process is otherwise correctly confined. Inspect existing port assignments and add the port to the service’s SELinux port type:
semanage port -a -t {{port_type}} -p tcp {{port_number}}
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Use the protocol that the service actually listens on, and check for an existing assignment before adding one. A port label grants SELinux permission to the appropriate domain; it does not open a firewall or make the service listen. Configure the VPS firewall separately.
Check and set booleans deliberately
Booleans are policy switches for common, documented service behaviors. List available settings and their current values with:
semanage boolean -l
When a service’s documented behavior is controlled by a boolean, enable it persistently with the distribution-supported setsebool -P {{boolean_name}} on form, then retest. Record why the boolean is required and avoid enabling broad options merely to silence a denial.
Diagnose an AVC denial without disabling SELinux
Use a repeatable sequence rather than reacting to the first command that produces output.
- Reproduce one failure. Trigger the specific request, job, or deployment step once, noting the timestamp.
- Read the complete AVC. Identify the source domain, target type, object class, requested permission, executable, and path. Confirm that the event belongs to the service you tested.
- Ask for an explanation. Pass the relevant audit record to
audit2whyusing the distribution’s documented invocation. It can indicate a likely labeling error, a boolean, a wrong domain, or a missing policy rule. - Check alternatives. Inspect file contexts, port contexts, available booleans, and the service’s expected domain transition. SELinuxProject’s troubleshooting sequence recommends these checks before policy generation.
- Correct the smallest configuration issue. Apply a file-context rule and
restorecon, assign the correct port type, enable the narrowly relevant boolean, or fix the service launch context. - Retest in enforcing mode. Once the cause is addressed, use
setenforce 1and repeat the workflow. A clean test should produce no unexplained AVCs.
Several superficially similar denials can have different causes. For example, a web process reading an application directory may need a file label, while binding a new listener may need a port label. Treat the object and requested permission in the AVC as the starting point.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When a custom local policy module is justified
Some applications genuinely perform an operation not covered by the shipped policy. Only after labels, ports, booleans, and service-domain transitions have been checked should you consider a local module.
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- Reproduce the specific required operation and collect only the related AVC records.
- Use the distribution’s policy-development tools to generate a candidate module from that narrow evidence.
- Review every requested permission and remove rules unrelated to the documented application behavior. Check whether the generated rule grants access to an overly broad path, object class, or domain.
- Install the reviewed module with
semoduleusing the release’s documented syntax. - Test the application in enforcing mode, inspect new AVCs, and document the business reason, source package, review date, and removal procedure.
Red Hat explicitly advises that audit2allow should not be the first response to an SELinux denial. Blindly converting every denial into allow rules can hide a compromised process, preserve a bad label, or grant more access than the application needs. A local module should represent a verified requirement, not an automatic bypass.
Return to enforcing mode and make it survive reboot
When testing is complete, switch the running host back with:
setenforce 1getenforce
This runtime change is immediate but temporary. Set the persistent configuration to SELINUX=enforcing in /etc/selinux/config, or use the equivalent configuration mechanism documented by the distribution. Reboot during a planned maintenance window, then verify both the effective and configured state with getenforce and sestatus.
Do not assume that a successful setenforce 1 proves the next boot will enforce policy. Only the persistent setting controls startup. After reboot, exercise the critical SSH, web, database, backup, and deployment paths again and review AVC records for unexplained events.
Why a web server is blocked: a decision guide
| Symptom | First checks | Likely corrective action |
|---|---|---|
| Web process cannot read files in a new document root | Inspect the directory’s SELinux label and compare it with a working document root. | Add the correct persistent file-context rule with semanage fcontext, then run restorecon. |
| Service starts on its usual port but fails on a custom port | Inspect SELinux port assignments and the AVC’s target port. | Map the port to the service’s expected port type with semanage port; configure the firewall separately. |
| Uploads, network connections, or another optional feature are denied | List booleans and read the AVC explanation with audit2why. |
Enable only the documented boolean that matches the required behavior, persistently. |
| Service runs under an unexpected domain | Check the executable, launch method, transition records, and source domain in the AVC. | Correct the service unit, executable labeling, or transition; do not immediately add an allow rule. |
| Denial remains after labels, ports, and booleans are correct | Reproduce once, isolate the exact permission, and review the candidate policy. | Consider a narrow, reviewed local module and document why the shipped policy is insufficient. |
Operational checklist for a production VPS
- Verify the provider image, kernel, filesystems, policy type, and installed management and audit tools.
- Keep a console or recovery path available before changing enforcement.
- Use permissive mode only for a defined test window and record when it starts and ends.
- Exercise every production service path, including backups and scheduled jobs, while collecting AVC evidence.
- Fix file contexts, port contexts, booleans, and service transitions before considering custom policy.
- Review generated rules line by line; never install an unexamined stream of
audit2allowoutput. - Return to enforcing mode, set
SELINUX=enforcingpersistently, reboot, and verify. - Document custom labels, booleans, modules, rationale, owner, and rollback steps so future administrators can maintain the policy.
Key takeaways
For a supported Linux VPS, enforcing mode should be the destination. Permissive mode helps you observe and develop policy but leaves operations unblocked. Most application failures are resolved by correcting labels, assigning nonstandard ports, enabling a narrowly relevant boolean, or fixing the service domain. AVC records and audit2why provide the evidence; a custom module is the last, reviewed option when the application truly needs a permission outside the shipped policy.
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