failure
Why Did My Preview Deployment Fail, and What Should I Inspect First?
Start with the first failing step in the build or boot log, not with a theory about the platform. Name whether the failure is a missing dependency, a missing environment variable, a process that never bound a port, or a health check that never returned success. ReleaseQuill can help separate configuration faults from code faults when you supply the log. A failed preview is not a production outage, and it is not evidence that a later build will fail the same way.
What this question usually means
The search is a diagnosis job. The rewrite cluster is: where is the build log, which dependency is missing, which environment value was absent, did the process listen, and did the health check run against the right port. People also ask whether “it failed” means the platform is down. It usually means this preview did not become a URL you can open.
Keep the failure attached to one commit and one command. Mixing two branches, two package managers, or two health paths in one report makes the log unreadable. ReleaseQuill will not invent a root cause that is not in the log you supplied.
Materials or prerequisites
Bring the build log or boot output, the repository and commit, the build command, the environment variable list you intended, and the health-check path or port. If the preview URL was issued and then failed later, bring the time and the response you saw.
Redact secrets. A log that contains tokens should be trimmed before you paste it. ReleaseQuill does not claim live access to an external CI system; you attach the evidence in the conversation.
Step 1: Stop at the first failing command
Scroll to the first non-zero exit, compiler error, or “module not found.” Record that line verbatim. Later errors are often fallout. If the log is truncated, say so. A diagnosis from an incomplete log is a guess.
Step 2: Classify missing dependency versus missing configuration
If the log names a package, lockfile, or language version, the next step is to make that dependency explicit in the repository or the command. If the log names an unset variable, a refused database URL, or a missing file path, the next step is configuration, not a new library. Write the class on the release note before you change anything.
Step 3: Check port and health-check assumptions
Many previews fail after a “successful” build because the process listens on a different port than the health check, or the check hits `/` while the app only answers `/health`. Confirm the port, the path, and that the process stayed alive long enough for the check to run. A crash loop looks like a health failure until you read the boot log.
Step 4: Reproduce with one change
Fix the named gap — dependency, variable, port, or path — and rebuild that same commit. Do not combine a dependency bump with a config change in the same preview if you still need to know which one mattered. Record the new log next to the old one.
Step 5: Leave a failure record even when you retry
Write the commit, the failing step, the class of fault, and the next command. A vanished failure helps no one. If you cannot reproduce, say that the evidence was a single log, not a stable defect.
Verification
The diagnosis is usable when a second person can find the first failing line, agree on the fault class, and name the one change to try. The preview is recovered only when the same health check you specified at the start succeeds on a URL for this commit. A different URL, a skipped check, or a log you no longer have is not verification.
Limits that stay in this diagnosis
Every app you preview stays in your own workspace, and each published link is one of our shared preview addresses rather than a hostname you control. Promotion beyond the preview environment requires separate authorization. A failed preview does not authorize a production hotfix, and a recovered preview does not authorize promotion.
ReleaseQuill may describe candidate workflows and use the log you supplied. It must not claim production availability, verified outcomes, or guaranteed results, and it must not claim a live connection to external platforms. One clean retry is not proof that the next commit will build.
What ReleaseQuill does in this workflow
ReleaseQuill reads build output in a conversation, helps separate configuration faults from code faults, and leaves a release record. Paste the log, name the commit, and ask which step failed first. You still own the repository change and the decision to retry.
Sign in from this site. You stay in the ReleaseQuill conversation. There is no claim here that an external CI account is already connected.
FAQ
Questions this guide is for
The build log is huge. What do I paste?
The command that failed, twenty lines above it, and the first error. If the failure is at boot, paste the last successful bind line and the first health or crash line. Say when you truncated the log.
The health check failed but the build passed. Is that a platform outage?
Usually not. Check the port, the path, and whether the process stayed up. Treat it as a preview that did not become usable until those three agree.
Can ReleaseQuill restart a failed preview on an external host?
Not as a live connection to an external platform. You can retry the test deployment in this workspace with the corrected command or variables. Promotion and third-party host actions stay with whoever is authorized.
Does ReleaseQuill have a public API or MCP integration?
No. ReleaseQuill has no public API or MCP integration. You work through the conversation: point it at a repository, inspect build and health results, and record the exact rollback path before promotion.
Start in the workspace
Inspect this failed preview in the workspace
Sign in or create an account. You return to the ReleaseQuill conversation. Paste the first failing log lines and the commit, then keep the diagnosis with the rollback note.