CodeIgniter uses writable runtime locations for logs, cache and other application data. A failed save needs a check of the exact path, process account and available storage.
IN THIS ARTICLE
Gather the details you will need
Locate the current writable directory and read the relevant error. Confirm whether the failing operation runs through web PHP, a scheduled command or a background process.
01 Troubleshoot CodeIgniter 4 writable paths and logs
Check free space and inode usage for the hosting account. Determine whether the application has reached a quota before changing permissions.
Inspect the failing directory and its parent ownership. Files uploaded by another deployment account can prevent the web process from updating existing runtime data.
Grant the required application account appropriate access to the specific runtime paths. Keep private logs and session data outside public download locations.
Review the logging configuration and retention. Ensure a growing log cannot silently consume all available storage.
Repeat the failing operation and confirm a fresh, private diagnostic entry is available. Remove any temporary public error output enabled during investigation.
02 Example: diagnose a failed CodeIgniter save by execution path
| Observed symptom | Check before changing permissions |
|---|---|
| Web requests save, but the scheduled command fails | Compare the cron user, PHP binary, project path and private environment loading. |
| All saves fail after a deployment | Inspect ownership of the exact runtime path and its parents, including files created by the deployment account. |
| Logging and uploads fail together | Check account space, inode usage and filesystem restrictions. |
| A log URL is publicly readable | Correct the public-root layout and access configuration before collecting further sensitive diagnostics. |
Repeat the original operation after the narrow correction and inspect the new file owner. Keep persistent uploads and session data when clearing an identified cache; do not remove the whole writable tree.
Confirm the expected result
Test the original save, cache or session operation and check that the resulting file has the expected owner and location. Confirm a visitor cannot retrieve runtime logs through the website.
If the problem continues
If writes fail only from cron, compare that command account and PHP runtime with the web application. If permissions are correct, investigate path configuration, quota and filesystem restrictions.
A common question
Should I delete the whole writable directory to start again?
No. It may contain sessions, uploads or other live data in addition to disposable cache. Identify the affected content and back up persistent data before removing anything.