Gitlab Failover & High Availability Setup

[GitHK]

In order to avoid blocking developer on all teams, we require a more stable GitLab installation which will bring better support in case of hardware/software issues.

To achieve this goal we like to have a deployment with the following:

• tollerate 1 cluster node failure (service will still be available)
• testable and reproducible environment for developers (to avoid surprises on the production cluster)
• ability to self heal when the node is joined back to the cluster

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• automatic updates procedure
• automatic data backup strategy in case total system failure (total data cancellation by accident)

Everything before the separator line is necessary