65 lines
3.1 KiB
Markdown
65 lines
3.1 KiB
Markdown
---
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stage: Enablement
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group: Geo
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info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
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type: howto
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---
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# Bring a demoted primary node back online **(PREMIUM ONLY)**
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After a failover, it is possible to fail back to the demoted **primary** node to
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restore your original configuration. This process consists of two steps:
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1. Making the old **primary** node a **secondary** node.
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1. Promoting a **secondary** node to a **primary** node.
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CAUTION: **Caution:**
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If you have any doubts about the consistency of the data on this node, we recommend setting it up from scratch.
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## Configure the former **primary** node to be a **secondary** node
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Since the former **primary** node will be out of sync with the current **primary** node, the first step is to bring the former **primary** node up to date. Note, deletion of data stored on disk like
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repositories and uploads will not be replayed when bringing the former **primary** node back
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into sync, which may result in increased disk usage.
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Alternatively, you can [set up a new **secondary** GitLab instance](../replication/index.md#setup-instructions) to avoid this.
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To bring the former **primary** node up to date:
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1. SSH into the former **primary** node that has fallen behind.
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1. Make sure all the services are up:
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```shell
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sudo gitlab-ctl start
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```
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NOTE: **Note:**
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If you [disabled the **primary** node permanently](index.md#step-2-permanently-disable-the-primary-node),
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you need to undo those steps now. For Debian/Ubuntu you just need to run
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`sudo systemctl enable gitlab-runsvdir`. For CentOS 6, you need to install
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the GitLab instance from scratch and set it up as a **secondary** node by
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following [Setup instructions](../replication/index.md#setup-instructions). In this case, you don't need to follow the next step.
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NOTE: **Note:**
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If you [changed the DNS records](index.md#step-4-optional-updating-the-primary-domain-dns-record)
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for this node during disaster recovery procedure you may need to [block
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all the writes to this node](planned_failover.md#prevent-updates-to-the-primary-node)
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during this procedure.
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1. [Setup database replication](../replication/database.md). Note that in this
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case, **primary** node refers to the current **primary** node, and **secondary** node refers to the
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former **primary** node.
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If you have lost your original **primary** node, follow the
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[setup instructions](../replication/index.md#setup-instructions) to set up a new **secondary** node.
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## Promote the **secondary** node to **primary** node
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When the initial replication is complete and the **primary** node and **secondary** node are
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closely in sync, you can do a [planned failover](planned_failover.md).
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## Restore the **secondary** node
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If your objective is to have two nodes again, you need to bring your **secondary**
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node back online as well by repeating the first step
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([configure the former **primary** node to be a **secondary** node](#configure-the-former-primary-node-to-be-a-secondary-node))
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for the **secondary** node.
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