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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchA successful SSH login proves that the server accepted your identity; it does not prove that your account can write to the destination. To fix an upload error, check the exact remote user, every directory in the path, and the policy controlling ownership, groups, ACLs, mounts, and security contexts. Then test a write as that same account.
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For a safe long-term repair, upload to a user-owned staging directory or grant a deployment group or ACL only the access the release process needs. Do not make a web root universally writable with chmod -R 777.
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Start with the exact account and path
“Permission denied” can describe several different failures. A transfer may be rejected before a remote shell starts, or the SSH session may work while the filesystem refuses a create, replace, rename, or directory traversal operation. Diagnose the operation that failed rather than changing permissions blindly.
Run this from a shell that can connect to the VPS, replacing the account, host, and path with the values from your transfer command:
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ssh user@host 'id; namei -l /var/www/site/file.txt; ls -ld /var/www /var/www/site'The command prints the effective user and groups, then shows permissions on every component of the path. If the destination file does not exist, namei still helps identify a parent directory that cannot be traversed.
What the output tells you
idconfirms which account and groups the server is actually using. A local username or a different SSH key does not change the remote account.namei -lreveals permissions and ownership for each parent directory. The account needs execute (traverse) permission on every directory between the root and the target.ls -ldshows the final directory’s owner, group, and mode. Creating a new entry requires write and execute permission on that directory; replacing or renaming an existing entry also depends on the containing directory.
A file’s mode alone is therefore not enough. A file can be writable while an ancestor directory blocks access, and a directory can be readable while denying creation because it lacks write permission.
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Separate SSH authentication from filesystem authorization
SSH authentication answers “may this key and username start a session?” Filesystem authorization answers “may this account perform this operation on this path?” The first can succeed while the second fails.
When the error is Permission denied (publickey)
If the message mentions publickey, appears before a remote shell starts, or occurs while opening the SSH connection, inspect the connection rather than the web directory. Verify the username, host, port, and identity file:
ssh -i ~/.ssh/deploy_key -p 22 deploy@host 'id'The OpenSSH client uses -i to select an identity file. On the client, the private key should normally be readable only by its owner, and the SSH directory should not be writable by other users:
chmod 700 ~/.ssh
chmod 600 ~/.ssh/deploy_key
chown -R "$USER:$USER" ~/.sshOracle’s OpenSSH guidance notes that incorrect permissions in directories on either side of the connection can cause a Permission Denied error. Correcting key and .ssh ownership addresses authentication; it does not grant write access under /var/www.
When SSH works but scp or SFTP cannot write
Run the diagnostic command through the same account used by the transfer. If ssh deploy@host 'id' works but scp file deploy@host:/var/www/site/ fails, the likely issue is remote path authorization, a read-only filesystem, a chroot or forced command, or a service that changes permissions after upload.
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Understand the permissions required for an upload
For a new file, the destination directory must permit the account (or an applicable group or ACL) to write and traverse. For an existing file, the operation may require write permission on the file, its parent directory, or both, depending on whether the client truncates, replaces, renames, or creates a temporary file.
Directory traversal is required at every level
Consider /var/www/site/assets/app.css. The account must be able to traverse /var, /var/www, /var/www/site, and any intervening directory. A missing execute bit on one parent produces “permission denied” even if app.css is mode 664.
Creation, replacement, and rename are different operations
- Creating
new.cssneeds write and execute permission on the containing directory. - Overwriting an existing file may need write permission on that file and its directory.
- Atomic deployment tools commonly upload a temporary file and rename it. The rename is controlled by the source and destination directories, so a directory that permits ordinary writes may still reject the final move.
Check the precise destination in the client command. A trailing slash can make a client treat a path as a directory, while a filename can request replacement of an existing entry.
Safe repair pattern 1: upload to a staging directory
A user-owned staging directory is the simplest least-privilege design. The transfer account writes only to its home directory; a controlled release step then copies or moves validated files into the service tree.
- Log in as an administrator or an account allowed to create the deployment directory.
- Create and assign the staging path:
sudo mkdir -p /home/deploy/releases/site
sudo chown -R deploy:deploy /home/deploy/releases
sudo chmod 750 /home/deploy /home/deploy/releases /home/deploy/releases/site- Upload to the staging path:
scp -i ~/.ssh/deploy_key ./site.tar.gz deploy@host:/home/deploy/releases/site/- Perform a server-side release step as an account authorized to update the service directory. For an archive, extract into a new release directory, set the intended owner and mode, and switch the service’s release link or path according to your deployment design.
- Keep the staging directory outside the web-served tree unless you deliberately need it served. Remove failed or obsolete releases according to your retention policy.
This pattern avoids granting an upload account broad write access to configuration files, package-managed content, or the entire web root.
Safe repair pattern 2: use a shared deployment group
Use a group when several administrators or automation accounts must update the same site tree. The web service account can retain read access while the deployment group receives only the write access required.
- Create a dedicated group and add the deployment account:
sudo groupadd webdeploy
sudo usermod -aG webdeploy deployThe account must start a new login session before its supplementary group list reflects the change.
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- Assign the site directory to the group:
sudo chown -R root:webdeploy /var/www/site
sudo find /var/www/site -type d -exec chmod 2775 {} +
sudo find /var/www/site -type f -exec chmod 0664 {} +The leading 2 on directory mode sets the setgid bit, causing newly created entries to inherit the directory’s group. File and directory modes should be adjusted to your application’s needs; executable files, private configuration, and upload directories may require different modes.
- Confirm that the web service can still read the tree and that deployment members can create and replace the intended files.
Setgid does not make every future file writable by every group member if a restrictive umask removes group write permission. Default ACLs can enforce the desired inherited permissions when a group design alone is insufficient.
Safe repair pattern 3: grant a narrowly scoped ACL
An access control list is useful when the deploy account needs access but changing the directory’s owning group would affect other users or services. First inspect existing ACLs:
getfacl /var/www/siteGrant the account traversal and the directory permissions it actually needs. For example, to allow deploy to work in a site directory:
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sudo setfacl -m u:deploy:rwx /var/www/siteIf the account must create files in nested directories, apply an intentional ACL to those directories or configure default ACLs for new entries. Then inspect the result with getfacl; the effective permission can be reduced by a mask entry. ACLs should be documented because ordinary ls -l output may show a trailing plus sign without explaining the full policy.
Change ownership only when it matches the service design
Changing ownership can be correct for a tree deliberately managed by the deployment account:
sudo chown -R deploy:web /var/www/siteIt is dangerous as a reflex. A recursive ownership change can make a web server unable to read files, alter package-managed files, expose secrets to a deployment user, or conflict with a container bind mount. Before using chown -R, decide which account should own source files, which account should run the service, and whether configuration and runtime-generated data belong in separate directories.
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Verify the repair as the transfer account
Do not validate only as root or as your administrative account. Test the same identity used by scp, SFTP, or rsync:
sudo -u deploy test -w /var/www/site && echo writable
sudo -u deploy touch /var/www/site/.permission-test
sudo -u deploy rm /var/www/site/.permission-testThe first command checks whether the directory is considered writable. The create-and-remove test verifies the actual operation and leaves no test file when successful. If your deployment replaces files through a temporary name, test creation, rename, and deletion in the same directory rather than testing only an existing file.
Choose the transfer tool for the job
| Tool | Best fit | Useful capabilities | Important permission behavior |
|---|---|---|---|
| scp | One-off file or archive copy | Simple command-line transfer; accepts an identity file with -i and destinations such as user@host:/remote/path/ |
Needs write and traversal access to the remote destination; it does not solve ownership policy. |
| SFTP | Interactive inspection and transfer | put, put -R, ls -l, chmod, chown, and df where the server supports the relevant extensions |
Useful for identifying the directory that fails. put -p preserves permissions and access times when supported, which can conflict with destination policy. |
| rsync | Repeatable folder synchronization over SSH | Efficient incremental copies; can preserve links, devices, owners, groups, and permissions when requested | Rsync must be installed on both ends for remote transfers. Destination umask and default ACLs affect newly created files. |
A conservative rsync command
When the server’s ownership and mode policy should remain authoritative, avoid copying local metadata:
rsync -az --no-perms --no-owner --no-group ./site/ deploy@host:/home/deploy/releases/site/After synchronization, run the server-side release step that sets the service’s intended owner and mode. If you do need controlled permissions during transfer, rsync’s --chmod option can set modes explicitly, but it does not override directory ownership, ACLs, read-only mounts, or security policies.
Check the less obvious causes
If ownership, modes, and group membership look correct, continue with the controls below.
ACLs
An ACL can allow or deny an account independently of the traditional owner/group/other bits. Run getfacl on every relevant parent and the destination directory. Look for a restrictive ACL mask or an explicit deny in the system’s access-control model.
SELinux or another mandatory access-control system
On systems using SELinux, inspect the security context:
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ls -Zd /var/www/siteA Unix mode that appears writable may still be denied by the context. Use the distribution’s audit logs and policy tools to identify the denial; do not disable SELinux merely to make an upload work. The correct context for web content differs from the context for user home files and writable application data.
Read-only mounts
A filesystem mounted read-only rejects writes for every user, including root in many situations. Check the mount options:
findmnt -no TARGET,OPTIONS /var/wwwIf the output includes ro, investigate why the mount is read-only before changing file permissions. A failed disk, an intentional immutable deployment, or a container volume policy may be responsible.
Full disk or inode exhaustion
A filesystem can have free bytes but no inodes, preventing new files. Check both:
df -h /var/www
df -i /var/wwwFree space or inodes according to the system’s retention and logging policy. Deleting arbitrary files from a live service can cause data loss.
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An SFTP-only account may be confined to a chroot and unable to address the path you see from an ordinary shell. An SSH ForceCommand can replace the requested command, and a server’s SFTP subsystem configuration can limit operations. Compare an interactive SSH session with the SFTP account’s visible root and inspect the effective SSH server configuration as an administrator.
Containers and bind mounts
A path such as /var/www/site may be a bind mount owned by a UID or GID that differs from the host account names. Check the container or orchestration configuration, numeric IDs, and mount mode. Changing host ownership can break the container’s service user or be overwritten when the container is recreated.
Permission-rewriting deployment services
A post-upload hook, extraction job, package update, or web application may reset ownership and modes immediately after transfer. Watch the directory after a successful test and inspect deployment logs. If permissions change back, fix the responsible job or its release policy instead of repeatedly applying manual chmod.
Quick Recap
Common mistakes and their safer alternatives
- Uploading directly to
/var/wwwas an ordinary user: use a staging directory or a documented deployment group. - Running
chmod -R 777: grant the required owner, group, or ACL permissions and retain restrictive modes for secrets. - Testing only with
sudo: usesudo -u deployso the test matches the transfer account. - Copying local ownership and modes with rsync: use
--no-perms --no-owner --no-groupwhen the destination policy should win. - Assuming an existing file’s mode controls replacement: verify the containing directory, temporary-file creation, and rename permissions.
- Changing ownership recursively without a service plan: separate deploy, web-service, configuration, and runtime-data ownership before modifying the tree.
A practical decision path
- If the error is
Permission denied (publickey), correct the username, key, host, port, and local SSH permissions. - If SSH login succeeds, run
id,namei -l, andls -ldon the exact destination. - Check traversal on every parent and write/execute permission on the destination directory.
- Choose staging, a shared group, or a narrowly scoped ACL rather than opening the directory to everyone.
- Test create, replace, rename, and delete as the transfer account.
- If the test still fails, inspect ACLs, SELinux contexts, mount options, disk and inode capacity, SFTP restrictions, containers, and permission-rewriting services.
- Select
scpfor a simple one-off copy, SFTP for interactive diagnosis, or rsync for repeatable synchronization.
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