statefulset: Use stateful sets for posgres deployments (PROJQUAY-6672) #927
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jonathankingfc
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May 30, 2024
jonathankingfc
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- Swap Postgres and Clair Postgres Deployments to StatefulSets
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| @@ -1,5 +1,5 @@ | |||
| apiVersion: apps/v1 | |||
| kind: Deployment | |||
| kind: StatefulSet | |||
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how will this work with existing deployments? On upgrade will it replace the deployment with a statefulset?
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Yes, it will replace the deployment with a stateful set. This is so that we do not have issues with overlapping deployments that would cause issues on the upgrade job.
| replicas: 1 | ||
| strategy: | ||
| type: Recreate |
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This will switch the deployment to a rolling upgrade, which could cause the old and new pod to run at the same time. Will that cause issues?
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Since it is a stateful set, it will only run one pod at a time
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In theory, issues can occur where Quay is operating on a Clair that has a split-brain during a deployment (i.e. the security worker requests the indexing state from a new pod, sees it has changed then makes an indexing request but it goes to an old pod). In practice, this is how it works in production and we've never seen problems so I think it's probably fine but something to document.
| @@ -1,5 +1,5 @@ | |||
| apiVersion: apps/v1 | |||
| kind: Deployment | |||
| kind: StatefulSet | |||
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The original issue seems to be caused by the old and the new db pods being matched by the same service, making the requests against the db go to either or randomly. Does switching to stateful sets fix this issue?
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Yes, since their will be only one underlying pod attached to the service
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- Swap Postgres and Clair Postgres Deployments to StatefulSets
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