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diff --git a/doc/user/admin_area/geo_nodes.md b/doc/user/admin_area/geo_nodes.md new file mode 100644 index 00000000000..d6d6d9b2517 --- /dev/null +++ b/doc/user/admin_area/geo_nodes.md @@ -0,0 +1,57 @@ +# Geo nodes admin area **[PREMIUM ONLY]** + +For more information about setting up GitLab Geo, read the +[Geo documentation](https://docs.gitlab.com/ee/administration/geo/replication/index.html). + +When you're done, you can navigate to **Admin area > Geo** (`/admin/geo/nodes`). + +## Common settings + +All Geo nodes have the following settings: + +| Setting | Description | +| --------| ----------- | +| Primary | This marks a Geo Node as primary. There can be only one primary, make sure that you first add the primary node and then all the others. | +| URL | The instance's full URL, in the same way it is configured in `/etc/gitlab/gitlab.rb` (Omnibus GitLab installations) or `gitlab.yml` (source based installations). | + +The node you're reading from is indicated with a green `Current node` label, and +the primary is given a blue `Primary` label. Remember that you can only make +changes on the primary! + +## Secondary node settings + +Secondaries have a number of additional settings available: + +| Setting | Description | +|---------------------------|-------------| + Selective synchronization | Enable Geo [selective sync](https://docs.gitlab.com/ee/administration/geo/replication/configuration.html#selective-synchronization) for this **secondary** node. | +| Repository sync capacity | Number of concurrent requests this **secondary** node will make to the **primary** node when backfilling repositories. | +| File sync capacity | Number of concurrent requests this **secondary** node will make to the **primary** node when backfilling files. | + +## Geo backfill + +Secondaries are notified of changes to repositories and files by the primary, +and will always attempt to synchronize those changes as quickly as possible. + +Backfill is the act of populating the secondary with repositories and files that +existed *before* the secondary was added to the database. Since there may be +extremely large numbers of repositories and files, it's infeasible to attempt to +download them all at once, so GitLab places an upper limit on the concurrency of +these operations. + +How long the backfill takes is a function of the maximum concurrency, but higher +values place more strain on the primary node. From [GitLab 10.2](https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/3107), +the limits are configurable - if your primary node has lots of surplus capacity, +you can increase the values to complete backfill in a shorter time. If it's +under heavy load and backfill is reducing its availability for normal requests, +you can decrease them. + +## Using a different URL for synchronization + +The **primary** node's Internal URL is used by **secondary** nodes to contact it +(to sync repositories, for example). The name Internal URL distinguishes it from +[External URL](https://docs.gitlab.com/omnibus/settings/configuration.html#configuring-the-external-url-for-gitlab) +which is used by users. Internal URL does not need to be a private address. + +Internal URL defaults to External URL, but you can customize it under +**Admin area > Geo Nodes**. |