Use three separate roles: a deployment or login account owns your application code, Apache and PHP run as the operating system’s web-service account, and MySQL owns its database files. Give Apache/PHP read and directory-traverse access to code, then grant write access only to specific directories for uploads, caches, sessions, or generated files. On Debian-family systems that service account is commonly www-data; on Amazon Linux it is commonly apache. Verify the active service configuration instead of assuming either name.
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Do not solve a PHP permission error with chmod -R 777. That mode lets every local user and any compromised process write throughout the tree. Least privilege, narrow writable paths, and clear ownership make a LAMP installation easier to audit and limit the damage from a compromised web process.
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What ownership means in a LAMP stack
LAMP combines Linux, Apache HTTP Server, MySQL, and PHP. Linux evaluates every file operation using the identity of the process making the request. In a normal web request, PHP code executes inside an Apache worker, so the effective identity is Apache’s service account rather than the account you use to log in or deploy a release.
The deployment identity
A human administrator or an automated deployment account should own application source code and perform releases. That account can check out a new version, run migrations, set configuration, and roll back a release without giving the web server ownership of the entire project. Ownership gives accountability: a release can be tied to a specific user or deployment process instead of being silently changed by a running request.
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The web-service identity
Apache and PHP should run under the distribution’s dedicated, unprivileged service account. Debian-family examples normally use www-data; Amazon Linux documentation commonly uses the apache group and account. These names are conventions, not universal constants. A custom unit, container, or hosting image may use another identity. The account generally needs to read PHP, HTML, CSS, JavaScript, and other assets and to traverse every parent directory leading to them. It should write only where the application must create runtime data.
The database identity
MySQL is a separate service. Its operating-system account, normally mysql, needs access to database files and selected runtime resources. Giving Apache ownership of a MySQL data directory mixes two trust boundaries and can expose or corrupt every database on the host.
How Linux permissions map to web requests
Each path has an owner, a group, and permissions for the owner, group, and everyone else. Linux checks the process identity against the owner first, then its supplementary groups, then the “other” class. A process does not gain access merely because a different account owns a parent directory.
| Object | Permission | What it allows | Typical LAMP implication |
|---|---|---|---|
| Regular file | Read | Read file contents | Apache usually needs this for application code and assets |
| Regular file | Write | Change file contents | Usually unnecessary for PHP, templates, CSS, or uploaded files |
| Regular file | Execute | Run the file as a program | Not required for ordinary PHP source served through the interpreter |
| Directory | Read | List names in the directory | Useful for directory listings or application scans, but not always required to open a known path |
| Directory | Write | Create, delete, or rename entries | Required in upload, cache, session, and generated-output directories |
| Directory | Execute | Traverse the directory and access known entries | Required on every parent directory in a path Apache must reach |
The difference between file and directory write permission explains many confusing errors. To create /var/www/site/storage/log.txt, PHP needs write and execute on storage; write permission on an existing log.txt is irrelevant if the file does not yet exist. Deleting or renaming a file is also controlled by the containing directory, not by the file’s own write bit.
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A practical directory layout
Treat code and runtime data as different classes of path. A typical project might look like this:
| Path or category | Owner and group | Apache/PHP access | Reason |
|---|---|---|---|
| Application source and templates | Deployment account; a controlled deployment group | Read and traverse only | Releases are deployment-managed, not request-managed |
| Public document root | Deployment account; web-service group | Read and traverse; no general write | Serves static assets without allowing code replacement |
| Uploads | Deployment account or a dedicated data owner; web-service group | Write only in this directory | Accepts user-created files; validate names and content in the application too |
| Cache, sessions, queues, generated assets | Deployment account and web-service group, or an ACL for both | Write only in the specific runtime directory | Allows normal operation without making the project writable |
| Secrets and private keys | Root or the narrowest service that needs them | Not web-readable | Keeps database credentials and signing keys outside public paths |
| MySQL data and runtime files | mysql:mysql where the MySQL installation requires it |
Apache/PHP: none | Separates database storage from the web tier |
Do not place credentials, private keys, or other secrets in a directory that Apache can serve. A file that is not linked by your application can still be requested directly if the web server can reach it.
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Identify the real service account before changing anything
First determine which process is failing and which identity it uses. The account name in a tutorial may not match your host.
- Check the running processes:
ps -eo user,group,comm,args | grep -E 'apache2|httpd|php-fpm' - Inspect the service manager’s configured user and group. For a unit named
httpd, for example:systemctl show httpd -p User -p GroupUse
apache2or the PHP-FPM unit name when that is what your distribution provides. - Read the distribution configuration for worker directives such as
User,Group,user, orgroup. A PHP-FPM pool can run as a different account from Apache itself. - Record the deployment account, web-service account, PHP-FPM account, and MySQL account before applying ownership changes. They are separate roles even when a small development machine happens to use the same group.
Deployment patterns that avoid world-writable code
Shared group with setgid directories
A deployment user and the web service can collaborate through a dedicated group. On an Amazon Linux-style layout, AWS documentation demonstrates group ownership and mode 2775 on /var/www, allowing the login user and Apache group to add, delete, and edit document-root content. The setgid bit (the leading 2) makes new files inherit the directory’s group.
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That is a deployment pattern, not a universal production setting. If Apache only needs to read code, use a read-only group arrangement and give write permission to a small runtime directory instead of the entire document root.
ACLs for two named roles
When one directory must be writable by both a deployment account and the web service, a POSIX ACL can express that requirement without granting access to every member of a broad group. For example:
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minutesudo setfacl -m u:deploy:rwx,u:www-data:rwx /var/www/site/storage
sudo setfacl -d -m u:deploy:rwx,u:www-data:rwx /var/www/site/storageReplace deploy and www-data with the identities on your host. The default ACL affects new entries; inspect the result with getfacl. ACLs add an extra layer to audit, so document them and remove stale entries when a deployment account changes.
Read-only code with narrow writable exceptions
This is usually the safest production design: the release tree is owned by the deployment account and readable by the service group, while storage, cache, or public/uploads are the only writable paths. A compromised PHP request can then alter runtime data but cannot replace the application code that processes future requests.
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Set ownership and modes step by step
Run these commands only after substituting your real project path and service group. Review each result; recursive changes are powerful and can affect unrelated files.
- Assign the release tree to the deployment identity and a controlled group:
sudo chown -R deploy:webgroup /var/www/site - Set conservative directory and file modes for code. The setgid bit shown here keeps the group on newly created entries; omit it if your workflow does not require group inheritance:
sudo find /var/www/site -type d -exec chmod 2750 {} ; sudo find /var/www/site -type f -exec chmod 0640 {} ; - Make the web-service account a member of the intended group, if that is your chosen design, then start a new service process so group membership is refreshed:
sudo usermod -aG webgroup www-data sudo systemctl restart apache2Use the actual account and unit names on your distribution.
- Create only the runtime directories that need writes and assign their group explicitly:
sudo install -d -o deploy -g webgroup -m 2770 /var/www/site/storage sudo install -d -o deploy -g webgroup -m 2770 /var/www/site/public/uploads - Verify that files created by a test request inherit the expected owner, group, and mode. If the application creates files with excessive permissions, inspect its umask rather than compensating with a world-writable parent.
Some applications require the service account to own a runtime directory because they rename temporary files or maintain lock files there. Grant that ownership only to the specific directory, not to the entire application tree.
Diagnose a PHP “permission denied” error
Use a fixed sequence so you do not broaden permissions blindly.
- Identify the exact path. Copy the complete path from the PHP or web-server log. “Uploads failed” is not enough; the missing permission may be on a parent directory.
- Confirm the process identity. Check Apache and PHP-FPM separately. PHP-FPM pools can run under a different user from the HTTP worker.
- Walk every parent directory. On Linux,
namei -l /var/www/site/storage/file.datdisplays each component’s owner, group, and mode. The service account needs execute permission on every directory in the chain. - Classify the operation. Reading an existing file needs file read plus directory traversal. Creating, deleting, or renaming needs write and execute on the containing directory. Modifying an existing file needs file write as well.
- Test as the service identity. A harmless read test such as
sudo -u www-data test -r /var/www/site/config/app.phpchecks the real account. For a write test, use a temporary file in the intended runtime directory and remove it immediately.
- Inspect logs and mandatory access controls. Apache, PHP-FPM, and the kernel may report a denial even when Unix mode bits look correct. SELinux or AppArmor can block access independently of owner and group.
- Grant the narrowest fix. Correct the parent directory, group, ACL, or security policy that actually blocks the operation. Re-test, then remove any temporary broad permission.
MySQL files have their own ownership rules
Oracle’s MySQL Secure Deployment Guide says most installation files can remain root-owned. Exceptions include the data directory, error log, mysql-files directory, PID file, and socket; these resources need access by the operating-system mysql user. MySQL also needs read access to its configuration files and binaries.
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The MySQL Reference Manual documents default UMASK=0640 and UMASK_DIR=0750; database directories are created with 0750 by default. These defaults limit access to the MySQL account and its group. If a table or file operation reports an operating-system permission error, inspect the effective umask, the directory’s traversal bits, ownership, the systemd unit, and any SELinux or AppArmor rule before changing modes.
Never run a blanket command such as chown -R www-data /var/lib/mysql. It can prevent MySQL from starting, expose database contents to the web process, and destroy the separation between application and database roles. Use the package’s documented paths and service account, and stop MySQL before any maintenance that genuinely requires changing its data files.
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Mandatory access-control systems add policy labels or profiles on top of Unix ownership. On an SELinux-enabled host, a directory can be mode-readable yet denied because its context is not permitted for web content. AppArmor can similarly restrict which paths a profile may read or write. Look for denial records in the system journal or security logs and use the distribution’s policy tools to assign the correct context or profile rule. Disabling SELinux or AppArmor, or switching to an unrestricted profile, hides the problem rather than fixing it.
Common mistakes and safe recovery
chmod -R 777
This grants read, write, and execute to owner, group, and everyone else. Any local account or compromised service can alter code, inject files, or delete data. Replace it with explicit directory and file modes and a narrowly writable runtime path.
Making Apache the owner of the whole project
It may make uploads work, but it also allows a web request to overwrite templates, configuration, and executable code. Restore deployment ownership, then grant the service account only the access required for runtime directories.
Fixing the file instead of its parent directory
If PHP creates or deletes entries, changing the target file’s mode cannot help when the containing directory lacks write and execute. Inspect the full path with namei -l.
Leaving temporary permissions behind
Record the original owner, group, mode, and ACL before troubleshooting. After the test, remove temporary grants, restart the affected service if its groups changed, and confirm that secrets and database paths remain unreachable from the web account.
Quick Recap
Compare common ownership layouts
| Layout | Release owner | Apache/PHP writes | Collaboration mechanism | Best fit |
|---|---|---|---|---|
| Read-only release tree | Deployment account | Only uploads, cache, sessions, and generated output | Service group or ACL on runtime directories | Most production applications |
| Shared web-root group | Deployment account and group | Broad document-root write access | Group ownership with setgid, such as mode 2775 |
Controlled hosting or deployment workflows that require edits in the document root |
| Web account owns project | Apache/PHP account | Nearly everything | Ownership itself | Generally avoid; weak separation and poor release accountability |
| ACL-based runtime access | Deployment account | Named runtime directories | Access and default ACL entries for deployment and web identities | Systems where a shared group would be too broad |
Operational checklist
- Confirm the actual Apache and PHP-FPM identities on this distribution.
- Keep application code and configuration deployment-owned and read-only to the web process.
- Grant write and execute on only the directories that create, delete, rename, or generate files.
- Keep secrets outside web-readable paths.
- Keep MySQL data and runtime resources under the documented
mysqlidentity. - Use
namei -l, service logs, and a service-identity test before changing modes. - Check SELinux or AppArmor when Unix permissions appear correct.
- Remove temporary broad permissions immediately after troubleshooting.
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