116 lines
5.1 KiB
Markdown
116 lines
5.1 KiB
Markdown
# NFS
|
|
|
|
## Required NFS Server features
|
|
|
|
**File locking**: GitLab **requires** advisory file locking, which is only
|
|
supported natively in NFS version 4. NFSv3 also supports locking as long as
|
|
Linux Kernel 2.6.5+ is used. We recommend using version 4 and do not
|
|
specifically test NFSv3.
|
|
|
|
**no_root_squash**: NFS normally changes the `root` user to `nobody`. This is
|
|
a good security measure when NFS shares will be accessed by many different
|
|
users. However, in this case only GitLab will use the NFS share so it
|
|
is safe. GitLab requires the `no_root_squash` setting because we need to
|
|
manage file permissions automatically. Without the setting you will receive
|
|
errors when the Omnibus package tries to alter permissions. Note that GitLab
|
|
and other bundled components do **not** run as `root` but as non-privileged
|
|
users. The requirement for `no_root_squash` is to allow the Omnibus package to
|
|
set ownership and permissions on files, as needed.
|
|
|
|
### Recommended options
|
|
|
|
When you define your NFS exports, we recommend you also add the following
|
|
options:
|
|
|
|
- `sync` - Force synchronous behavior. Default is asynchronous and under certain
|
|
circumstances it could lead to data loss if a failure occurs before data has
|
|
synced.
|
|
|
|
## Client mount options
|
|
|
|
Below is an example of an NFS mount point we use on GitLab.com:
|
|
|
|
```
|
|
10.1.1.1:/var/opt/gitlab/git-data /var/opt/gitlab/git-data nfs4 defaults,soft,rsize=1048576,wsize=1048576,noatime,nobootwait,lookupcache=positive 0 2
|
|
```
|
|
|
|
Notice several options that you should consider using:
|
|
|
|
| Setting | Description |
|
|
| ------- | ----------- |
|
|
| `nobootwait` | Don't halt boot process waiting for this mount to become available
|
|
| `lookupcache=positive` | Tells the NFS client to honor `positive` cache results but invalidates any `negative` cache results. Negative cache results cause problems with Git. Specifically, a `git push` can fail to register uniformly across all NFS clients. The negative cache causes the clients to 'remember' that the files did not exist previously.
|
|
|
|
## Mount locations
|
|
|
|
When using default Omnibus configuration you will need to share 5 data locations
|
|
between all GitLab cluster nodes. No other locations should be shared. The
|
|
following are the 5 locations you need to mount:
|
|
|
|
| Location | Description |
|
|
| -------- | ----------- |
|
|
| `/var/opt/gitlab/git-data` | Git repository data. This will account for a large portion of your data
|
|
| `/var/opt/gitlab/.ssh` | SSH `authorized_keys` file and keys used to import repositories from some other Git services
|
|
| `/var/opt/gitlab/gitlab-rails/uploads` | User uploaded attachments
|
|
| `/var/opt/gitlab/gitlab-rails/shared` | Build artifacts, GitLab Pages, LFS objects, temp files, etc. If you're using LFS this may also account for a large portion of your data
|
|
| `/var/opt/gitlab/gitlab-ci/builds` | GitLab CI build traces
|
|
|
|
Other GitLab directories should not be shared between nodes. They contain
|
|
node-specific files and GitLab code that does not need to be shared. To ship
|
|
logs to a central location consider using remote syslog. GitLab Omnibus packages
|
|
provide configuration for [UDP log shipping][udp-log-shipping].
|
|
|
|
### Consolidating mount points
|
|
|
|
If you don't want to configure 5-6 different NFS mount points, you have a few
|
|
alternative options.
|
|
|
|
#### Change default file locations
|
|
|
|
Omnibus allows you to configure the file locations. With custom configuration
|
|
you can specify just one main mountpoint and have all of these locations
|
|
as subdirectories. Mount `/gitlab-data` then use the following Omnibus
|
|
configuration to move each data location to a subdirectory:
|
|
|
|
```ruby
|
|
user['home'] = '/gitlab-data/home'
|
|
git_data_dir '/gitlab-data/git-data'
|
|
gitlab_rails['shared_path'] = '/gitlab-data/shared'
|
|
gitlab_rails['uploads_directory'] = "/gitlab-data/uploads"
|
|
gitlab_ci['builds_directory'] = '/gitlab-data/builds'
|
|
```
|
|
|
|
To move the `git` home directory, all GitLab services must be stopped. Run
|
|
`gitlab-ctl stop && initctl stop gitlab-runsvdir`. Then continue with the
|
|
reconfigure.
|
|
|
|
Run `sudo gitlab-ctl reconfigure` to start using the central location. Please
|
|
be aware that if you had existing data you will need to manually copy/rsync it
|
|
to these new locations and then restart GitLab.
|
|
|
|
#### Bind mounts
|
|
|
|
Bind mounts provide a way to specify just one NFS mount and then
|
|
bind the default GitLab data locations to the NFS mount. Start by defining your
|
|
single NFS mount point as you normally would in `/etc/fstab`. Let's assume your
|
|
NFS mount point is `/gitlab-data`. Then, add the following bind mounts in
|
|
`/etc/fstab`:
|
|
|
|
```bash
|
|
/gitlab-data/git-data /var/opt/gitlab/git-data none bind 0 0
|
|
/gitlab-data/.ssh /var/opt/gitlab/.ssh none bind 0 0
|
|
/gitlab-data/uploads /var/opt/gitlab/gitlab-rails/uploads none bind 0 0
|
|
/gitlab-data/shared /var/opt/gitlab/gitlab-rails/shared none bind 0 0
|
|
/gitlab-data/builds /var/opt/gitlab/gitlab-ci/builds none bind 0 0
|
|
```
|
|
|
|
---
|
|
|
|
Read more on high-availability configuration:
|
|
|
|
1. [Configure the database](database.md)
|
|
1. [Configure Redis](redis.md)
|
|
1. [Configure the GitLab application servers](gitlab.md)
|
|
1. [Configure the load balancers](load_balancer.md)
|
|
|
|
[udp-log-shipping]: http://docs.gitlab.com/omnibus/settings/logs.html#udp-log-shipping-gitlab-enterprise-edition-only "UDP log shipping"
|