The Tool Desk
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A small VPS should not log every possible system call. Start with the files, identities, and privileged actions that matter to your service, measure the resulting event and disk volume, and expand coverage only when the investigation or compliance requirement justifies the overhead.
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What auditd is and what it records
auditd is the userspace component of the Linux Auditing System. The kernel generates audit events; the audit daemon receives those records and writes them to disk. It is designed for security auditing and investigation, not as a general-purpose application log collector. Web-server access logs, database logs, container logs, and application diagnostics still need their own logging configuration.
The normal tool chain has distinct jobs:
auditdruns as the daemon and persists records.auditctlinspects the live audit state, loads temporary rules, and performs runtime operations.ausearchfinds individual events by time, key, user, message type, or other fields.aureportsummarizes events into reports such as file, authentication, or user activity.augenrulescompiles rule fragments from/etc/audit/rules.d/into the file used at startup.
At boot, the audit rules file is read and the daemon settings come from /etc/audit/auditd.conf. The exact service name, package name, and reload behavior differ between distribution releases, so use the installed release’s manual pages when a command behaves differently from the examples below.
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Plan a VPS audit policy before installing rules
Audit data is useful only when an administrator can identify the event, the actor, and the affected object. Write down the questions your policy must answer before adding rules:
- Who changed SSH, sudo, account, firewall, or service configuration?
- Which privileged commands were executed?
- When did a sensitive file change, and which process performed the write?
- Which account authenticated, from where, and with what result?
- How long must records remain available if the VPS is compromised?
Map each question to a narrowly scoped rule family and give that family a stable key. For example, use a key such as ssh_config for SSH configuration, identity for account databases, and privileged_exec for a deliberately selected set of privileged execution events. Keys are labels, not access controls; they make later searches and reports understandable.
Decide where the records will live and who can read them. Local logs help with immediate troubleshooting, but an attacker who gains root access may be able to alter or delete local evidence. If incident requirements call for independent retention, forward audit records to a protected central destination using the distribution-supported audit transport and secure the receiving system separately.
Install and start auditd
Debian and Ubuntu family
On Debian- and Ubuntu-family systems, install the package named auditd with the release’s package manager. A typical sequence is:
sudo apt update
sudo apt install auditd audispd-plugins
sudo systemctl enable --now auditdThe plugin package is useful when the distribution provides forwarding or other audit event plugins; install only what your policy needs. Confirm the service and utilities are present:
sudo systemctl status auditd
sudo auditctl -s
sudo auditctl -lRHEL-family systems
On RHEL-family systems, install the package named audit with the release’s package manager. A common sequence is:
sudo dnf install audit
sudo systemctl enable --now auditdSome releases restrict how the audit service is restarted because stopping it can create an auditing gap. Follow that release’s auditd and service manual pages instead of forcing a generic restart. Then inspect the status and currently loaded rules:
sudo systemctl status auditd
sudo auditctl -s
sudo auditctl -lThe status command shows whether auditing is enabled and can reveal backlog or failure settings. The rule listing is important before you add anything: a rule already loaded by the distribution or an image provider can duplicate your new rule and multiply event volume.
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Understand the three kinds of audit rules
Control rules
Control rules set audit behavior rather than selecting a particular file or system call. They can set the event backlog, the response when the kernel cannot deliver an event, and rate limits. A control line must match the capacity and risk tolerance of the VPS; a setting copied from a large server can be inappropriate on a small instance.
Examples commonly seen in a policy include a delete-and-rebuild directive, a backlog size, a failure mode, and a rate limit. Do not paste those values blindly. A restrictive failure mode can stop or disrupt workloads when the audit pipeline is unavailable, while a permissive mode can leave you without records. The installed manual page documents the valid values and their consequences for your release.
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File rules
File rules watch a path and selected permissions. The permissions letters normally describe read, write, execute, and attribute changes; for change detection, write and attribute monitoring are the usual starting point. A focused fragment might contain:
-w /etc/ssh/sshd_config -p wa -k ssh_config
-w /etc/passwd -p wa -k identity
-w /etc/group -p wa -k identityThese watches answer who changed the file and when, but they do not make an application log collector unnecessary. Add only paths that matter to the VPS. Watching an entire large application tree can create substantial event volume and make investigations harder.
Path handling deserves care. If a watched path is a symbolic link, the target that the kernel resolves may be the object that must be watched. Check the target and the distribution’s audit documentation before assuming that a link itself covers every underlying file.
Syscall rules
Syscall rules match operations at the kernel interface and can cover actions that are not tied to one fixed path. They are powerful but easier to over-broaden. Include an architecture field where appropriate; the audit rules manual treats this as a performance recommendation. A deliberately scoped execution rule could look like:
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Put persistent rules in the right files
Use a numbered fragment under /etc/audit/rules.d/ for rules that must survive reboot. Numbering establishes a predictable compilation order and helps separate your policy from vendor-provided fragments. For example:
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sudoedit /etc/audit/rules.d/50-vps-baseline.rulesKeep that file limited to the policy you own:
-w /etc/ssh/sshd_config -p wa -k ssh_config
-w /etc/passwd -p wa -k identity
-w /etc/group -p wa -k identity
-w /etc/sudoers -p wa -k privilege_config
-w /etc/sudoers.d/ -p wa -k privilege_configRule-file syntax is essentially the same as an auditctl command without typing the command name. Do not place shell commands, comments that your release’s parser does not accept, or unrelated daemon configuration in the fragment. Keep daemon settings such as log rotation and disk actions in /etc/audit/auditd.conf.
The compiled file is commonly /etc/audit/audit.rules. On systems that provide augenrules, it combines the fragments and loads the result through the supported service workflow. Inspect the generated file and the live policy after every change so that a syntax error or duplicate is caught before an incident.
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- Inspect first. Save the output of
sudo auditctl -sandsudo auditctl -l. Note the current enabled state, backlog values, and existing rule keys. - Check the fragment. Review every path, permission, architecture, syscall, filter, and key. Remove broad rules that do not answer a defined investigative question.
- Compile through the distribution mechanism. On systems with
augenrules, run the command or the documented service reload procedure for that release. Do not assume that editing/etc/audit/audit.rulesdirectly is the preferred persistent workflow. - Confirm the live result. Run
sudo auditctl -lagain and verify that each intended rule appears once. If it does not, read the service journal and the audit utility’s error output before generating test traffic. - Record the change. Keep the fragment under configuration management, note the intended key and scope, and record the measured event volume after deployment.
Runtime commands issued with auditctl can be useful for diagnosis or a short experiment, but they may disappear at reboot and can conflict with the persistent policy. Treat the rule fragment as the source of truth for production.
Test that a rule records the right person and action
Never assume that a rule works because it loaded. Create a controlled test using a disposable file in a directory appropriate for your service:
sudo install -m 600 /dev/null /tmp/auditd-test-file
sudo sh -c 'printf test > /tmp/auditd-test-file'
sudo chmod 640 /tmp/auditd-test-fileIf the test path is covered by your rule, search by its key and restrict the time window:
sudo ausearch -k test_key --start recent -iUse the exact key from your rule in place of test_key. The interpreted output can include the event time, account identifiers, process ID, executable, system-call result, working directory, command arguments, and one or more PATH records. A single user action may produce several records tied together by the same audit event identifier; read the complete event rather than treating one line as the whole story.
To test a configuration watch, change the file in a controlled maintenance window, then restore it and verify both the change and the responsible process. For an execution rule, invoke a harmless command that actually matches the filters. If no event appears, check the rule key, the time interpretation, whether the operation used a symlink target, and whether another policy replaced your rule during reload.
Search events with ausearch
ausearch is the investigation tool. Begin with a key, then narrow by date, user, message type, or success status. Examples:
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sudo ausearch -k ssh_config -i
sudo ausearch -k identity --start today -i
sudo ausearch -k privileged_exec --start this-week --rawThe -i option interprets numeric identifiers and other values for easier reading. Raw output is useful when piping records to a report command or when another tool needs the original fields. Keep the time boundary close to the suspected incident; searching an entire long-retention log is slower and produces more noise.
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sudo ausearch --start this-week -k access --raw | aureport --file --summaryReplace access with the key used by your own rule family. You can also search for a particular account, executable, or event type when those fields are present, but do not infer that an absent field proves an action did not occur. Different rule types emit different record sets.
Summarize activity with aureport
aureport turns raw audit records into summaries that are easier to review regularly. Useful report families include authentication, account activity, executable use, and file activity. A file summary from a selected key can be produced with:
sudo ausearch --start today -k identity --raw | aureport --file --summary -iUse the report that matches the question. A file report helps identify changed paths; an authentication report helps review login outcomes; a user report can show which identities generated records. Summaries are a triage aid, not a replacement for reading the complete event with ausearch when you need process arguments, the parent process, or the exact return value.
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Monitor who changed a file
For a sensitive configuration file, create a file rule with a descriptive key and write/attribute permissions. For example:
-w /etc/example-service/config.yml -p wa -k example_config- Load the persistent policy through the supported rule workflow.
- Verify the line appears once in
auditctl -l. - Make a controlled edit as the account that normally administers the service.
- Run
sudo ausearch -k example_config --start recent -i. - Correlate the
PATH,SYSCALL,EXECVE, and related records. Check the effective UID, login UID, process ID, executable, command arguments, and success value.
The login UID can identify the original authenticated account even when a process changes its effective UID, while the effective UID describes the credentials used for the operation. Keep both distinctions in mind when investigating a privileged edit. If the file is replaced atomically, the event may involve a temporary file and rename rather than a simple write to the final pathname; inspect the complete event and watch the relevant directory or operation when your investigation requires that detail.
Control log growth on a small VPS
Audit logging consumes disk, CPU, and some memory for buffering. There is no universal safe event rate: an idle VPS and a busy build host can produce very different volumes. Measure your own workload after enabling each rule family.
- Start narrow. Prefer a few high-value file watches and carefully filtered syscall rules over indiscriminate syscall logging.
- Watch the backlog. Check
auditctl -sfor backlog pressure and review service messages when events are lost or delayed. - Measure records. Compare a fixed time window with
ausearchand inspect the size of the audit log directory with the system’s disk-usage tools. - Configure rotation. In
/etc/audit/auditd.conf, review the log path, maximum file size, number of retained files, and the action taken when space is low, the disk is full, or a write fails. - Reserve space. Ensure the filesystem holding audit logs has capacity for bursts as well as normal traffic. A policy that works during quiet hours can fill a small volume during deployment or an attack.
- Choose failure behavior deliberately. Backlog, rate-limit, and failure-mode settings trade availability against evidence. Document the choice and test the operational consequence on a non-production VPS.
Do not quote a generic CPU or disk percentage as a guarantee. The cost depends on the selected syscalls, path activity, process rate, kernel, storage, and workload. Recheck volume after application, package, or deployment changes.
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Keep audit records useful and defensible
Protect local audit files with restrictive ownership and permissions, and ensure ordinary application accounts cannot rewrite them. Limit administrative access to the tools and configuration. If the VPS is part of an incident-response program, forward records to a protected central destination so that compromise of the VPS does not erase the only copy. Central forwarding adds network, queue, and retention dependencies; monitor those dependencies and keep a local buffer sized for an outage.
Use meaningful, stable keys rather than a different label for every minor edit. A key should describe the investigative purpose, such as identity, ssh_config, or privilege_config. Keep a short policy document that maps each key to the files or operations it covers and states who owns the review.
Distribution differences and common failure modes
The rule is in a file but not active
Check whether the fragment has a valid filename and syntax, whether augenrules compiled it, and whether the service reload method for that release was used. Compare the generated rules with auditctl -l. A direct edit to a generated file can be overwritten at the next reload.
The same event appears many times
Look for duplicate fragments, an existing vendor rule, and overlapping file and syscall rules. Remove redundant coverage or give each intentional family a distinct key. Do not solve duplication by ignoring records after the fact; reduce the policy at its source.
A file change was not recorded
Confirm that the changed object is the watched path, not a symbolic-link target or an atomically replaced file. Check that the selected permissions include the operation, that the event time falls inside the search window, and that the rule remained loaded. Review the complete event for a rename or directory operation.
The VPS becomes unstable after enabling auditing
First reduce broad syscall coverage and examine backlog, rate, and disk-space messages. Restore a narrow baseline, measure the workload, and add one rule family at a time. If the policy uses a failure mode that can block or halt work when records cannot be written, follow the documented recovery procedure for that distribution rather than deleting rules blindly.
Restart commands fail
Some distributions deliberately restrict stopping or restarting the audit daemon. Read the installed auditd, auditctl, and service-manager manual pages and use the supported reload or boot-time workflow. A failed restart does not necessarily mean that the existing policy stopped auditing.
A maintainable auditd workflow
- Define the security questions and retention requirement for the VPS.
- Install the audit package and verify the daemon and utilities.
- Inspect current status and rules before adding anything.
- Create one numbered fragment in
/etc/audit/rules.d/with narrow scope and descriptive keys. - Compile and load it through the distribution-supported mechanism.
- Generate a known test event and verify it with
ausearch. - Use
aureportfor scheduled summaries andausearchfor investigations. - Measure event volume, backlog, and disk consumption on the real workload.
- Review rule usefulness after application, package, and infrastructure changes.
- Forward records to protected central storage when local-only evidence is not sufficient.
This process keeps auditd focused on kernel-generated security evidence, makes searches repeatable, and avoids turning a small VPS into an unmanageable stream of low-value records.
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