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If the systemd unit file changed, run sudo systemctl daemon-reload before the restart. A foreground process started with bin/rails server is different: stop it with Ctrl+C and start it again from the Rails application directory. The method you choose determines whether listeners briefly close, whether requests can continue, and whether your old and new application versions must work together.
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“Restart the Rails server” can mean several different operations on a Linux VPS. A production deployment usually has Puma supervised by systemd, while a development shell may have a foreground process started with bin/rails server. Restarting the wrong process can leave the public application unchanged, create a second process competing for the same port, or terminate a service that systemd immediately starts again.
Before issuing a command, determine these four details:
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- Supervisor: Is systemd managing Puma, or was the process launched manually?
- Unit name: Is it
puma.service, or an application-specific name such asmyapp-puma.service? - Application directory: Which release or deployment path is configured as the service’s working directory?
- Restart objective: Do you need a routine process replacement, a code reload with minimal interruption, or a phased deployment?
On a VPS, systemd is commonly the process supervisor and runs as PID 1. The service unit, rather than the command you might use locally, is the authoritative definition of how Puma starts: executable path, working directory, environment, user, sockets, and restart policy.
Discover a Puma unit safely
List loaded services whose names contain “puma”:
systemctl list-units --type=service | grep -i pumaIf that returns nothing, inspect the deployment configuration or unit files under /etc/systemd/system/ and /usr/lib/systemd/system/ (the exact directory varies by distribution). Use the complete unit name shown by systemd, including any application prefix and the .service suffix when you write commands.
Do not infer the name from your domain name. A service may be called myapp-puma.service, puma_myapp.service, or something entirely different. If multiple Rails applications share a VPS, restarting a generic puma.service may affect only one of them—or the wrong one.
Restart Puma under systemd
Once you know the unit, the routine production command is:
sudo systemctl restart puma.serviceReplace puma.service with the exact configured unit. Immediately check the result:
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sudo systemctl status puma.serviceA successful command means systemd accepted the request; it does not prove that Puma finished booting, bound the expected socket, loaded the correct release, or can serve a request. Read the status output for an active state, recent process identifiers, and the last log lines. If the status is not active, stop testing the public site and inspect the journal.
Reload systemd when the unit file changed
Systemd reads unit definitions into its manager. Editing a file does not automatically make the manager use the new contents. After changing /etc/systemd/system/<unit>.service, run:
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sudo systemctl daemon-reload
sudo systemctl restart <unit>.service
sudo systemctl status <unit>.servicedaemon-reload is needed for changes to settings such as ExecStart, WorkingDirectory, Environment, dependencies, users, restart policies, or socket relationships. It is not a substitute for restarting the service: it refreshes systemd’s configuration, while restart replaces the running Puma process.
Use a complete production sequence
-
Connect to the VPS over SSH with an account allowed to manage the unit:
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Change to the deployment directory if you need to inspect Rails configuration, release files, or application logs:
cd /srv/myapp/currentThe directory is only an example; use the path configured by your deployment.
-
Reload the manager if the unit was edited:
sudo systemctl daemon-reload -
Restart the exact unit:
sudo systemctl restart myapp-puma.service -
Verify the unit:
sudo systemctl status myapp-puma.service -
If it is inactive or failed, capture the boot-session journal and application log before trying again:
sudo journalctl -u myapp-puma.service -b
Correct the error identified in the output—often a path, permission, environment variable, executable, working-directory, or bind configuration problem—then restart. Repeating the same restart command without addressing the reported failure rarely changes the outcome.
Restarting a foreground Rails process
A process started directly from a shell with bin/rails server is not the same as a systemd-managed production service. The Rails command line runs in the context of the application, and the server command starts the Rails server using the application’s configuration.
To restart that kind of process, return to the terminal where it is running and press Ctrl+C. Wait for the process to exit, then from the Rails application directory start it again:
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cd /path/to/your/app
bin/rails serverIf the original terminal is gone, find the specific process and terminate it deliberately rather than killing every Ruby process on the host. A manually launched process may have a different Ruby version, bundle, environment, port, or credentials from the production service. Starting it as a replacement for Puma can therefore produce misleading results even when the command appears to work.
Use this foreground procedure for development, diagnosis, or a deployment explicitly designed around a manually managed process. For a production VPS, restart the supervisor-managed unit so systemd retains responsibility for the process and its failure policy.
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Verification has three layers: the service manager, the application process, and the externally reachable endpoint. Check them in that order.
1. Service-manager state
sudo systemctl status <unit>.serviceLook for an active service and a recent “started” transition. A unit that is repeatedly restarting, marked failed, or exiting immediately needs log analysis before any browser test.
2. Journal and Rails logs
sudo journalctl -u <unit>.service -bThe -b option limits the view to the current boot. Add a time filter or follow the journal during a controlled restart when the output is large:
sudo journalctl -u <unit>.service -fAlso inspect the Rails application log in the deployment’s configured log directory. The journal commonly reveals systemd-level failures; the Rails log can expose boot exceptions, missing secrets, failed initializers, migration errors, or connection problems that occur after Puma starts.
3. Public request
Only after the service is healthy should you test the endpoint through the normal proxy or load balancer. Confirm a representative page, an authenticated route if appropriate, and a write operation only when it is safe in your environment. A successful systemd status does not validate reverse-proxy routing, TLS, database access, background jobs, or application-level health.
What a Puma systemd unit must provide
Puma’s documented systemd pattern uses an absolute Puma executable in ExecStart, a WorkingDirectory that points to the Rails application, and a restart policy such as Restart=always. These fields explain many restart failures:
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| Unit setting | Purpose | Typical failure when wrong |
|---|---|---|
ExecStart |
Absolute command and arguments used to launch Puma | “No such file or directory,” wrong Ruby or Bundler version, or an invalid option |
WorkingDirectory |
Directory from which the Rails application boots | Missing application files, incorrect relative paths, or inability to load the environment |
User |
Unix account that owns the Puma process | Permission failures reading releases, writing sockets, or accessing credentials |
Environment and environment files |
Runtime values such as Rails environment, secrets, paths, and ports | Boot errors, wrong database, missing credentials, or binding to an unexpected socket |
Restart |
Whether systemd starts Puma again after an exit | Unexpected downtime or a crash loop that hides the original error |
| Socket or port settings | Where Puma accepts traffic | Reverse proxy reports connection refusal or serves a different process |
Inspect the effective unit rather than relying only on the file you remember editing:
sudo systemctl cat <unit>.serviceThis displays the loaded unit and any drop-in overrides. If a deployment tool generated the unit, make changes in its source configuration when possible; otherwise a later deployment may overwrite manual edits.
Normal, hot, and phased Puma restarts
A systemd restart is convenient, but it is not automatically a zero-downtime deployment. Puma documents three built-in restart mechanisms, each with different behavior.
| Method | How it is triggered | Interruption characteristics | Important prerequisite |
|---|---|---|---|
| Normal restart | systemctl restart <unit> |
The old process is replaced; listener sockets may close while the new process initializes | Correct systemd unit and a healthy boot configuration |
| Hot restart | Puma receives SIGUSR2 |
The server socket remains open while new code loads, so requests are less likely to be lost; requests can still wait during initialization | Puma configuration and deployment must support the signal-based restart |
| Phased restart | Puma receives SIGUSR1 in cluster mode |
Workers are replaced one at a time, reducing interruption and avoiding a full worker stop | Old and new application versions must coexist safely |
| Status-server restart | A /restart request to Puma’s status server |
Depends on the configured status server and restart mode | Status server must be enabled and protected |
A hot restart keeps the server socket open, but it is not a guarantee that every request completes instantly. New code still has to load, workers still have to initialize, and long-running requests may experience latency.
A phased restart is useful for cluster mode because workers turn over individually. It is safe only when the old workers can run against the code, schema, and data written by the new workers. A migration that removes a column immediately, renames a field without compatibility code, or changes a serialized format can break the workers that have not yet been replaced.
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Signal-based restarts require the correct Puma master-process PID and a deployment that expects them. Obtain the PID from the service status or the process management configuration, then send only the documented signal to that process:
kill -USR2 <puma-master-pid>For a phased restart in cluster mode:
kill -USR1 <puma-master-pid>Do not send signals to an arbitrary Ruby process. If systemd owns Puma, confirm the process belongs to the target unit before acting. A systemd restart is easier to audit and recover; use a signal when the Puma configuration and deployment procedure specifically call for it.
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Choose the restart strategy based on listener behavior, cluster mode, code compatibility, and socket configuration—not merely on the desire for a shorter command.
Use phased restarts for compatible deployments
- Deploy code that can run with both the current and incoming database schema.
- Apply additive database changes first, such as creating a new column while retaining the old one.
- Release application code that can read and write both representations when necessary.
- Perform the phased restart in Puma cluster mode.
- Remove obsolete schema or compatibility code only after all old workers are gone and the new release is established.
This expand-and-contract approach is the practical consequence of Puma’s compatibility requirement: old and new workers overlap during a phased restart.
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Use socket activation when configured
With systemd socket activation, systemd owns the listening socket and passes it to Puma. The socket can remain listening while one Puma process is replaced, allowing a hot-style handoff with less listener interruption. Puma’s documentation notes that socket activation is not currently available on JRuby.
Socket activation is not created by running daemon-reload or by adding a random socket unit. The VPS must already have a matching .socket unit, the Puma service must be configured to receive the inherited socket, and the reverse proxy must point to that endpoint. Verify the actual units and dependencies before relying on this behavior.
Understand the limits of “zero downtime”
No restart method removes every deployment risk. Requests can wait while code loads; health checks can fail during boot; database locks can delay workers; and a bad release can leave every replacement worker unhealthy. A realistic goal is to keep the listener available while maintaining a tested rollback path, compatible migrations, and an independent health check.
Decision guide: which restart should you use?
| Situation | Recommended action | Why |
|---|---|---|
| Routine production restart; no unit changes | sudo systemctl restart <unit>.service, then status and logs |
Uses the existing supervisor and deployment settings |
| Unit file or drop-in was edited | sudo systemctl daemon-reload, then restart and verify |
Loads the new systemd definition before replacing Puma |
| Application started in a terminal | Ctrl+C, then bin/rails server from the app directory |
Controls the foreground process that actually owns the terminal |
| Cluster deployment with backward-compatible schema | Puma phased restart with SIGUSR1 |
Replaces workers individually |
| Deployment configured for a hot restart | Puma hot restart with SIGUSR2 |
Keeps the server socket open while the new process loads |
| Socket activation already configured | Use the service’s documented restart procedure | Systemd can keep the listening socket while Puma is replaced |
| Service is failed or crash-looping | Read journalctl and application logs, fix the reported cause, then restart |
Repeated restarts do not correct configuration or boot errors |
Troubleshoot common restart failures
“Unit not found”
The name is wrong, the unit is not installed, or systemd has not loaded a newly created file. Search loaded services and unit directories, confirm the spelling, and run daemon-reload if the file was just added. Do not create a second unit until you know how the application was deployed.
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“Permission denied”
Check the account in the unit, ownership of the release and shared directories, permissions on the Puma socket, and access to credentials or environment files. Running the command as root can mask an ownership error that will recur when systemd launches Puma as its configured service user.
Puma exits immediately
Read the service journal and Rails log for the first boot exception. Common categories include an invalid Ruby or Bundler path, missing secret, wrong WorkingDirectory, unavailable database, malformed configuration, or an occupied socket. Fix the first reported error, then perform one controlled restart.
Reverse proxy returns 502 or connection refused
Confirm that Puma is listening on the socket or port expected by the proxy, that the socket exists with the right owner and mode, and that the proxy targets the same application instance you restarted. A healthy systemd state alone does not prove that the proxy endpoint matches Puma’s bind setting.
The old code is still being served
Check the unit’s WorkingDirectory, ExecStart, release symlink, and environment. A restart can be perfectly successful while pointing at an older release path. Inspect the effective unit with systemctl cat and compare it with the deployment’s current release.
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The service keeps restarting
Use the journal to identify whether systemd is applying Restart=always after a clean-looking but unsuccessful boot. Temporarily stop the loop if necessary while preserving logs, correct the application or unit error, and then start the service deliberately. A restart policy is recovery automation, not evidence that the application is healthy.
A safe restart checklist
- Identify whether Puma is systemd-managed or foreground.
- Confirm the exact unit name and target application.
- Check whether the unit or a drop-in changed.
- Use
daemon-reloadbefore restarting changed systemd configuration. - Restart only the intended service.
- Read
systemctl statusimmediately. - Inspect
journalctl -u <unit>.service -band Rails logs if anything is abnormal. - Confirm the configured working directory, executable, user, environment, and bind endpoint.
- Test the application through its normal proxy only after the service is healthy.
- For minimal interruption, verify cluster mode, migration compatibility, and socket activation before choosing a signal-based or socket-preserving restart.
Key distinction to remember
The command that starts Rails is not necessarily the command that operates your production application. A foreground bin/rails server process belongs to the shell that launched it; a production Puma process belongs to its supervisor and unit definition. Restart the owner of the running process, verify the new process through systemd and logs, and select hot or phased behavior only when the deployment has been configured to support it.
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