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Use journalctl to read the systemd journal on your VPS. After connecting over SSH, start with sudo journalctl -e -n 100 for the last 100 entries, then narrow the result with -u (service), -b (boot), --since/--until (time), priority filters, or structured fields. Add -f to watch new entries as they arrive and press Ctrl-C to stop.
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What journalctl reads
journalctl prints entries stored in the journal by systemd-journald.service and systemd-journal-remote.service. The journal is structured: in addition to the message text, entries can be matched by fields such as _SYSTEMD_UNIT and _PID. This is different from opening an ordinary text log with cat or an editor. With no parameters, journalctl displays the journal entries available to the calling user, beginning with the oldest entry.
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“journalctl is used to print the log entries stored in the journal by systemd-journald.service and systemd-journal-remote.service.” — systemd project manual
On a VPS, the journal commonly contains messages from the operating system and systemd-managed services such as a web server or SSH daemon. What you can see depends on your account’s permissions and on which journal files the server still retains.
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Permissions on a VPS
Connect to the server over SSH, then use sudo for system-wide inspection when your account cannot read the journal directly. The systemd manual says that root and members of the systemd-journal, adm, and wheel groups can read all journal files, although the exact group privilege depends on the distribution. An ordinary user can read only the journal data that the system permits that user to see.
ssh user@your-serverIf a command without sudo returns a permission error or appears to show only a narrow set of entries, retry it with sudo rather than assuming the journal is empty.
Start with a useful snapshot
The following sequence gives you a readable baseline before you begin filtering:
- Open the newest entries in a pager:
sudo journalctl -e -n 100. The-n 100limit requests the last 100 entries, while-emoves the pager to the end so you begin with the most recent part of that result. - Produce copyable output:
sudo journalctl --no-pager -n 100. This suppresses the defaultlesspager, which is convenient interactively but can be awkward when you need to paste output into a ticket or save it from an SSH session. - Identify the failing unit: use
sudo systemctl status name.servicewhen you know a service is failing. The status view helps you confirm the exact unit name to pass tojournalctl.
These commands are read-only inspections. They do not change service state or delete journal data.
Choose the right scope
Most log investigations become manageable when you define one scope first: a service, a boot, a time window, or a combination. The options below cover the core cases.
| Need | Option or command | What it selects |
|---|---|---|
| All accessible entries | sudo journalctl |
The journal data visible to your account, oldest entry first. |
| One systemd service | sudo journalctl -u nginx.service |
Entries associated with the specified unit; -u also accepts a unit pattern. |
| Current boot | sudo journalctl -b |
Entries from the boot that is currently running. |
| Previous boot | sudo journalctl -b -1 |
Entries from the boot immediately before the current one, if retained. |
| Time interval | sudo journalctl --since "today" --until "now" |
Entries between the two parsed calendar or relative times. |
| Warnings and more severe messages | sudo journalctl -u nginx.service -p warning |
Messages at warning priority and higher for the selected service. |
Filters can be combined. For example, a unit, boot, time range, and priority can all be applied to the same query so that you are not scrolling through unrelated system activity.
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Read output without losing important context
Pager, line count, and order
By default, journalctl sends output through less. Use the arrow keys, Page Up, and Page Down to inspect a long result; press q to leave the pager. Add --no-pager whenever another command, a support ticket, or a script must receive plain output.
-n N limits the result to N entries. A small value such as -n 20 is useful for a quick health check; a larger value gives more context around a failure. -r reverses the display order, placing the newest matching entries first. This is useful when you want the latest event immediately without moving to the end of a long result.
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Use a stable timestamp format
The -o short-full output mode prints timestamps in the documented full date-and-time format. It is a practical choice when you are comparing entries from different commands or recording an incident timeline, because the date and time remain explicit instead of relying on a shortened display.
sudo journalctl -u nginx.service -o short-full --no-pager -n 50Keep the original message text and timestamp together when copying output. A line that looks suspicious in isolation may be normal once you see the preceding restart, dependency, or authentication event.
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Filter by a systemd unit
Use -u (the long form is --unit) with the exact systemd unit name:
sudo journalctl -u nginx.serviceThe option selects a systemd unit or a unit pattern. If the command returns nothing, verify the unit name with systemctl status; a package may use a different name, or the application may not be managed by systemd at all. You can add a count and disable the pager for a compact report:
sudo journalctl -u nginx.service -n 100 --no-pagerThe same form works for an SSH daemon when its unit is named sshd.service:
sudo journalctl -u sshd.service -n 100 --no-pagerUse the unit-specific query before searching all system logs. It removes unrelated kernel, timer, and other-service messages while preserving the service’s own startup, stop, error, and informational entries.
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When a unit is noisy, add -p warning to keep warning-priority and higher messages:
sudo journalctl -u nginx.service -p warning --no-pagerThis is a filter, not a claim that lower-priority messages are unimportant. If the warning-only view omits the event you need, rerun the unit query without -p and inspect the surrounding entries.
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View the current or previous boot
Boot filters are useful after a reboot, crash, or service failure that may have started before the current session:
sudo journalctl -b-b selects the current boot. A negative offset selects an earlier boot; -b -1 means the boot immediately before the current one:
sudo journalctl -b -1You can combine a boot with a unit or priority filter:
sudo journalctl -b -1 -u nginx.service -p warning --no-pagerEarlier boots must still exist in the journal. If retention has removed them, no command option can reconstruct those entries; investigate the boots that remain and review the server’s retention policy.
Limit the search to a time window
--since and --until accept calendar times such as 2012-10-30 18:17:16, as well as words including today, yesterday, tomorrow, and now. Relative forms such as -1h are also accepted by systemd’s time parser.
sudo journalctl --since "today" --until "now"For a narrowly defined incident, use explicit boundaries and preserve them in your notes:
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sudo journalctl -u nginx.service --since "-1h" --no-pagerTime filters reduce noise and make repeated checks comparable. If the first window is too narrow, widen one boundary rather than jumping immediately to the entire journal.
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Search structured fields
Because the journal is structured, you can pass matches in FIELD=VALUE form. For example:
sudo journalctl _SYSTEMD_UNIT=sshd.service --no-pagersudo journalctl _PID=1234 --no-pagerMatches on different fields are combined as a logical AND. A query that includes both _SYSTEMD_UNIT=sshd.service and _PID=1234 therefore asks for entries satisfying both conditions. Repeating a match for the same field creates alternatives for that field.
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sudo journalctl _SYSTEMD_UNIT=sshd.service _PID=1234 --since "-30m" --no-pagerStructured matches can be used alongside -u, -b, --since, --until, and priority filters. This layered approach is valuable during incident response: start with the service, add the time window, then add a field when the result still contains too much activity.
Follow logs in real time
The --follow (or -f) option prints recent matching entries and then waits for newly appended entries. Use it when restarting a service, reproducing a request, or watching an authentication attempt:
sudo journalctl -u nginx.service -fPress Ctrl-C to stop following. The command remains attached to the SSH session while it is running, so keep the terminal open or use an appropriate session manager if you need the observation to survive a disconnected connection.
Limit the initial history so the live stream starts close to the event you are testing:
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Use this order when a service is failing or a request produces an unexpected result:
- Check the unit state. Run
sudo systemctl status name.serviceand note the exact unit name, active state, and any immediate error text. - Read the latest unit entries. Run
sudo journalctl -u name.service -n 100 --no-pagerso the result is short enough to inspect and copy. - Define the incident window. Add
--sinceand--untilaround the time of the failure. A precise interval often separates the triggering event from routine background messages. - Watch a reproduction or restart. Add
-fto the unit query, then reproduce the request or restart the service in a second terminal. Stop the follower with Ctrl-C when the event is complete. - Compare with the prior boot. If the problem appeared after a reboot, run the same unit query with
-b -1to see whether the earlier boot recorded a different startup sequence. - Use priority and fields when output is noisy. Try
-p warning, then structured matches such as_SYSTEMD_UNIT=...or_PID=.... Combine conditions rather than dumping the whole journal repeatedly. - Check storage before changing retention. Run
sudo journalctl --disk-usageand record the result before deciding whether cleanup is necessary.
Keep the exact commands, time boundaries, and unit name in your incident notes. That makes a second investigation reproducible and prevents a broad query from being mistaken for a service-specific result.
Measure journal disk usage and clean up retention
Measure before deleting
sudo journalctl --disk-usage reports the combined size of active and archived journal files. It is a measurement command; it does not remove entries.
sudo journalctl --disk-usageVacuum archived files by age, size, or count
Vacuum operations remove eligible older archived files according to the policy you choose:
sudo journalctl --vacuum-time=14dsudo journalctl --vacuum-size=500Msudo journalctl --vacuum-files=10--vacuum-time=14dkeeps the policy based on age.--vacuum-size=500Mtargets a size limit.--vacuum-files=10limits the number of archived files retained.
Choose a policy that fits the server’s troubleshooting and compliance needs; the examples are mechanisms, not universal recommendations. If you need active files archived before cleanup, combine rotation with the vacuum operation:
sudo journalctl --rotate --vacuum-time=14dThe systemd manual warns that vacuuming acts on archived files. Active files remain, so the total reported by --disk-usage may not fall by the exact amount you expected after a vacuum command. Run --disk-usage again and interpret the new figure with that active-versus-archived distinction in mind.
Common problems and precise fixes
Permission denied or incomplete results
Retry with sudo. If you want non-root access, use a distribution-supported journal-reading group such as systemd-journal, adm, or wheel, remembering that group privileges vary by distribution. Do not assume that a partial result represents the entire server.
The service query is empty
Confirm the unit spelling with sudo systemctl status name.service. A missing result can mean the unit name is different, the service has not written entries in the selected interval, or the service is not managed by systemd. Remove the time and priority filters temporarily to distinguish an incorrect filter from a quiet service.
The output is difficult to copy
Add --no-pager and a bounded -n value. Use -o short-full when exact timestamps matter. Avoid pasting an unbounded all-journal query into a ticket; capture the narrowest interval that demonstrates the issue.
Following appears to hang
-f is supposed to wait for new entries. It prints the recent matching history and then blocks while listening for additions. Generate the event you are testing, or press Ctrl-C to return to the shell. If events are missing, relax one filter and verify that the service actually emits journal entries.
Vacuum did not free the expected amount
Check --disk-usage again and remember that active journal files are not removed by vacuum. Use --rotate with the vacuum policy when archiving active files first is appropriate, then measure again.
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| Command | Best use |
|---|---|
sudo journalctl -e -n 100 |
Open the newest 100 entries in the pager. |
sudo journalctl --no-pager -n 100 |
Copy the newest 100 entries without interactive paging. |
sudo journalctl -u nginx.service |
Read one service’s journal entries. |
sudo journalctl -u nginx.service -f |
Follow that service as new entries arrive; stop with Ctrl-C. |
sudo journalctl -b |
Inspect the current boot. |
sudo journalctl -b -1 |
Inspect the previous retained boot. |
sudo journalctl --since "today" --until "now" |
Limit output to a parsed time window. |
sudo journalctl -u nginx.service -p warning |
Show warning-priority and higher messages for a unit. |
sudo journalctl _SYSTEMD_UNIT=sshd.service |
Match a structured systemd-unit field. |
sudo journalctl --disk-usage |
Measure active plus archived journal storage. |
For most VPS incidents, begin with a bounded, unit-specific query and add one filter at a time. That keeps the scope clear, preserves the timestamps you need, and avoids changing retention settings merely to find a single log entry.
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