The Tool Desk
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Start with a five-minute triage
Use the result of each test to choose the next layer. Do not change several layers at once; otherwise you will not know which change solved the failure.
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- Check the service state. If Tomcat is managed by systemd, run
sudo systemctl status tomcat(replacetomcatwith the unit name used by your VPS) and thensudo journalctl -u tomcat -b --no-pager. A unit can be named after a version, an application, or a custom installation. - Find the first meaningful error. Inspect the instance’s
logs/directory and any output files configured by the startup method. In a Unix daemon setup, Apache documentscatalina.outandcatalina.erras possible destinations. Fix the earliest Java, path, permission, bind, or deployment error rather than the later cascade. - Test locally on the VPS. Run
curl -i http://127.0.0.1:8080/, substituting the connector port fromconf/server.xml. If this fails, stay focused on Tomcat, Java, its files, or local permissions. - Inspect the listening socket. Use
sudo ss -ltnpand look for the address and port owned by the Java process. No socket means startup or connector failure; a different process on that port means a conflict. - Only then test the public path. If localhost works but the domain does not, check the VPS firewall, provider firewall or security group, DNS, listener address, and reverse-proxy forwarding.
This order prevents a common mistake: opening port 8080 to the Internet when Tomcat never started, or rebuilding Tomcat when the real problem is a blocked provider firewall.
Identify how Tomcat is launched
The correct logs, environment, and restart command depend on the launch method. A package installation, a custom archive, and the shell or daemon scripts do not necessarily use the same user or paths.
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systemd unit
Check loaded units with systemctl list-units --type=service | grep -i tomcat. Then inspect the effective definition:
sudo systemctl cat tomcat
sudo systemctl status tomcat --no-pager
sudo journalctl -u tomcat -b --no-pagerLook in the unit for User=, Environment=, EnvironmentFile=, ExecStart=, CATALINA_HOME, and CATALINA_BASE. Run diagnostic commands as the same account where practical; an interactive shell may have a different PATH and JAVA_HOME from systemd.
Distribution package
Package-managed Tomcat may place configuration, logs, and web applications in distribution-specific directories and may use a versioned unit name. Do not assume that the directory from a downloaded archive is the active instance. The unit definition and its environment file are authoritative for that VPS.
Shell scripts or jsvc
For a manual installation, inspect $CATALINA_BASE/logs and the files redirected by the startup command. Apache’s Unix daemon example uses catalina.out and catalina.err. Capture the complete command, account, working directory, and exported variables before changing them. A command that succeeds from your login shell can fail when run by a service account.
Read the first real startup error
Tomcat often emits many secondary messages after one early failure. Search the beginning of the failed boot in the journal and the newest files in logs/. Classify the first actionable message:
- Java executable or
JAVA_HOMEerror: the service cannot find the required runtime, or the variable points to a nonexistent directory. - Bind exception: another process already owns the configured address and port, or the service lacks permission to bind the chosen port.
- Permission denied: the service account cannot read configuration or write logs, temporary files, work files, or deployment directories.
- Missing configuration: the active base directory lacks required files such as
conf/server.xmlorconf/web.xml. - Deployment failure: Tomcat starts, but an application or context fails while being deployed.
- Application stack trace: the container is running and the defect is inside the application, its dependencies, or its configuration.
Save the first error and the surrounding lines before restarting repeatedly. A restart can rotate or overwrite the most useful evidence.
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Verify Java for the Tomcat major version
Tomcat checks the Java runtime visible to its own process, not necessarily the one shown by your shell. Compare both environments:
java -version
readlink -f "$(command -v java)"
sudo -u tomcat env | grep -E 'JAVA_HOME|PATH'
sudo -u tomcat java -versionUse the real service account and unit name on your VPS. For systemd, inspect the unit’s environment and start command rather than relying on shell startup files.
| Tomcat line | Minimum Java version | What to verify |
|---|---|---|
| Tomcat 9.0.x | Java 8 or later | The service account resolves a supported Java executable. |
| Tomcat 10.1.x | Java 11 or later | Apache’s migration guidance states that Java 11 is the minimum. |
| Tomcat 11.0.x | Java 17 or later | Apache’s Tomcat 11 migration guide states that Java 17 is the minimum. |
Installing a newer Java globally does not fix a unit that still points to an older or removed path. Set JAVA_HOME to the Java installation directory (not the bin/java file), ensure the service account can traverse it, then reload and restart the unit:
sudo systemctl daemon-reload
sudo systemctl restart tomcat
sudo systemctl status tomcat --no-pagerUse the exact variable and path expected by the existing unit. If the error changes from an executable problem to an application compatibility error, Java discovery is fixed and the next layer needs attention.
Check CATALINA_HOME and CATALINA_BASE
CATALINA_HOME identifies the Tomcat installation. CATALINA_BASE contains instance-specific configuration, logs, deployed applications, work, and temp. Multiple instances can share one home while using separate bases.
Print the values in the same context as the service, then inspect the active base:
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echo "$CATALINA_HOME"
echo "$CATALINA_BASE"
find "$CATALINA_BASE/conf" -maxdepth 1 -type f -printf '%fn'
ls -ld "$CATALINA_BASE" "$CATALINA_BASE/conf" "$CATALINA_BASE/logs" "$CATALINA_BASE/temp" "$CATALINA_BASE/work"If variables are empty in your shell, obtain them from systemctl cat, an environment file, or the wrapper script. Apache warns that the required conf/server.xml and conf/web.xml must exist in CATALINA_BASE; a missing file can stop startup or normal operation. A frequent upgrade error is pointing the new service at an old, partially copied base.
Do not replace a working base wholesale. Confirm which settings are intentional, compare the new release’s default configuration, and copy only the required changes.
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Tomcat should not run as root. Apache recommends a dedicated non-root account with minimum permissions. Identify the account in the unit or startup script and test access as that account:
sudo -u tomcat test -r "$CATALINA_BASE/conf/server.xml" && echo readable
sudo -u tomcat test -w "$CATALINA_BASE/logs" && echo logs-writable
sudo -u tomcat test -w "$CATALINA_BASE/temp" && echo temp-writable
sudo -u tomcat test -w "$CATALINA_BASE/work" && echo work-writableReplace tomcat and the variable with your actual values. The account needs read and directory-traverse permission for the installation and configuration, plus write access to runtime locations used by that instance: especially logs, temp, work, and deployment directories.
Correct ownership narrowly, for example with an administrator-approved command such as sudo chown -R tomcat:tomcat /path/to/instance when that entire instance is intended to belong to the service account. Do not make the installation world-writable. Recheck parent-directory permissions, ACLs, and security policies if ownership appears correct but access is still denied.
Confirm the connector and port
Apache’s security guidance says that a non-TLS HTTP/1.1 connector is configured on port 8080 by default. The default is not a guarantee: the active conf/server.xml value wins.
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grep -nE 'Use the actual configured port in the curl command. A connector may bind only to a specific address rather than all interfaces. A request to 127.0.0.1 can therefore work while a request to the VPS's public address fails, or the reverse.
Resolve a port conflict
A bind failure means another process already owns the same port and IP. The HTTP connector reference notes that only one server application can listen on a particular port number and IP address. Identify the owner with sudo ss -ltnp (or your platform's equivalent), then choose one deliberate action:
- stop or reconfigure the unrelated process;
- move Tomcat to an unused connector port and update every proxy rule and firewall rule; or
- change the bind address when two services can safely share a port on different interfaces.
Restarting without resolving the owner will reproduce the same failure.
Separate Tomcat failure from network failure
When localhost fails
Connection refused or a timeout on the VPS itself points to a stopped process, wrong port, failed bind, local firewall, or listener-address mismatch. Check the systemd result, the first startup error, the socket list, and server.xml before changing DNS.
When localhost works but the public address fails
Tomcat has accepted a local request, so inspect the path between the Internet and that socket:
- Confirm the domain's DNS record resolves to the intended VPS address.
- Check the VPS firewall and the hosting provider's firewall or security group.
- Confirm that the connector listens on an address reachable from the proxy or external client, not only loopback.
- Verify that any reverse proxy is running and forwarding to the same port that passed the local
curltest.
Apache's troubleshooting guidance provides a useful boundary: if the request is absent from Tomcat's access log, Tomcat did not process it. Investigate the listener, firewall, DNS, or proxy layer instead of the application.
Fix Apache or Nginx reverse-proxy forwarding
A reverse proxy should target the connector that works locally. Check the proxy's upstream address and port, then compare it with server.xml and the socket list. A one-digit port mismatch is enough to produce a public 502 or connection-refused error while direct localhost access remains healthy.
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For Apache HTTP Server, verify the forwarding rule and the response rewrite setting. Apache's proxy documentation uses ProxyPass to send requests to a Tomcat connector and recommends ProxyPassReverse so backend redirects are rewritten for clients. After editing, validate and reload Apache using the command appropriate to your distribution, then test the domain again.
Restrict the backend connector so only the proxy host can reach it when the architecture permits. This reduces direct exposure of the Tomcat port while leaving the public HTTP or HTTPS endpoint at the proxy. Do not expose an administrative or unencrypted connector merely to make troubleshooting easier.
For Nginx, inspect the proxy_pass destination, the active server block, and the reload result. Confirm that the request reaches the expected virtual host and that TLS termination, host headers, and redirects are consistent with the application. If the proxy access log shows the request but Tomcat's access log does not, inspect the upstream connection and proxy error log.
Handle deployment and application failures
Tomcat can be running even when one application returns an error. Distinguish a container health check from an application health check:
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- A failed application context usually appears in deployment logs with a stack trace, missing dependency, invalid descriptor, or incompatible API.
- Test the failing context path separately from the root URL and inspect the corresponding access and application logs.
Do not “fix” an application stack trace by deleting all of work or changing ownership broadly. Preserve logs, make a targeted change, and restart only when the application or container requires it.
Upgrade without carrying the old failure forward
Treat a Tomcat upgrade as a compatibility change, not a file-copy operation. Start with the new release's default configuration and reapply intentional connector, host, valve, realm, and proxy settings one at a time. Do not copy a previous major release's configuration wholesale; obsolete attributes or changed defaults can prevent startup.
Moving from Tomcat 9 to Tomcat 10 or later can require application changes because the Java web API namespace changes from javax.* to jakarta.*. A container that starts successfully can still reject an application compiled for the old namespace. Keep the previous installation available for rollback, point the new unit at a separate CATALINA_BASE, and switch traffic only after the local connector and application contexts pass their checks.
Choose the least risky fix
| Failure layer | Typical evidence | Preferred scope | Reversibility and security |
|---|---|---|---|
| Process or unit | systemd reports failed; no Java socket | Correct the unit command, environment, or dependency | Highly reversible; keep the service non-root |
| Java runtime | Unsupported version, missing executable, wrong JAVA_HOME |
Point the service to a supported Java installation | Reversible; test as the service account |
| Filesystem | Permission denied or missing base files | Restore required files and narrow ownership/write access | Reversible; avoid world-writable directories |
| Connector | Bind exception, wrong port, no listener | Free or deliberately change the port and update dependants | Reversible; avoid unnecessary public exposure |
| Firewall or DNS | Local curl works; public request never reaches access log | Correct records and network policy | Change only the required rule; retain least exposure |
| Proxy | Proxy error or wrong backend; Tomcat local test passes | Match upstream port and add response rewriting where required | Reversible; restrict direct backend access |
A repeatable recovery runbook
- Record the unit name, service account, installation path, base path, Java version, configured connector port, and current error.
- Read the first meaningful journal or Tomcat log error and classify it by layer.
- Verify the Java minimum for the Tomcat major version in use, from the service account's environment.
- Verify that
CATALINA_BASE/conf/server.xmlandweb.xmlexist and that runtime directories are writable by the dedicated account. - Inspect the configured connector and confirm the actual socket with
ss. - Run a local
curlagainst that exact address and port. - If local access succeeds, trace DNS, provider and host firewalls, listener address, and proxy forwarding in that order.
- After one targeted change, restart or reload the affected service, repeat the local test, and then test the public hostname.
- Keep the working configuration and logs so a later upgrade or deployment can be compared against a known-good state.
This sequence answers the most common symptoms: “systemctl failed” is resolved from the unit and first error; “connection refused” is resolved from the listener and port; “localhost works but the domain fails” is resolved outside Tomcat unless the proxy points at the wrong connector; and Java-version errors are resolved in the service environment rather than only in an administrator's shell.
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