debian-mirror-gitlab/doc/user/admin_area/geo_nodes.md

Geo nodes admin area [PREMIUM ONLY]

For more information about setting up GitLab Geo, read the Geo documentation.

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 node. There can be only one primary node; make sure that you first add the primary node and then all the others.
Name	The unique identifier for the Geo node. Must match the setting gitlab_rails[geo_node_name] in /etc/gitlab/gitlab.rb. The setting defaults to external_url with a trailing slash.
URL	The instance's user-facing URL.

The node you're reading from is indicated with a green Current node label, and the primary node is given a blue Primary label. Remember that you can only make changes on the primary node!

Secondary node settings

Secondary nodes have a number of additional settings available:

Setting	Description
Selective synchronization	Enable Geo selective sync 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

Secondary nodes are notified of changes to repositories and files by the primary node, and will always attempt to synchronize those changes as quickly as possible.

Backfill is the act of populating the secondary node with repositories and files that existed before the secondary node 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, 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 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.

Multiple secondary nodes behind a load balancer

In GitLab 11.11, secondary nodes can use identical external URLs as long as a unique name is set for each Geo node. The gitlab.rb setting gitlab_rails[geo_node_name] must:

• Be set for each GitLab instance that runs unicorn, sidekiq, or geo_logcursor.
• Match a Geo node name.

The load balancer must use sticky sessions in order to avoid authentication failures and cross site request errors.