Cases2 cases

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1. IL-0465 IONOS Container Registry image pushes and pulls failed with 504 Gateway Timeout

   IONOS Cloud2026

   Symptoms

   On 4 March 2026 customers of the IONOS Container Registry got 504 Gateway Timeout errors when pushing or pulling container images, and deployments that relied on the registry were blocked. The status page first reported an increased error count on the registry at 09:23 UTC, saying customers might be unable to pull images.

   Image pull failuresHigh error rate

   Trigger

   A migration combined with a temporary capacity constraint placed two critical control plane components on the same proxy instance, despite anti-affinity rules; the shared proxy then reached its concurrent connection limit.

   Root cause

   Capacity exhaustion

   Component

   Container registry and its credentialsManaged Kubernetes control plane and provider APIPod scheduling and placement

   Contributing factor

   No headroomSingle point of failureNo alert on limit

   Remediation

   • Rolled back a component of the Kubernetes control plane to an earlier version
   • Provisioned additional proxy capacity
   • Moved the affected control plane components onto separate proxy instances

   Action items

   • Redesign registry-to-API connectivity so each node uses its own local proxy
   • Adjust alert thresholds to warn before proxy connection use approaches capacity
   • Deploy more infrastructure clusters and redistribute registries so no cluster exceeds safe capacity, with automation that keeps balancing load

   View case
2. IL-0474 Harness Feature Flags auth returned 502s when rescheduled pods could not get an image deleted from Artifact Registry

   Harness2025

   Symptoms

   At 1:47am GMT on 28 October 2025, Harness's automated synthetic checks that simulate SDK traffic for the Feature Flags service began failing, and some requests to http://config.ff.harness.io/client/auth received 502 responses.

   High error rateImage pull failures

   Trigger

   During a routine deployment, Kubernetes rescheduled some pods of a Feature Flags dependency onto new nodes that did not have the image cached locally.

   Root cause

   Data loss or corruption

   Component

   Container registry and its credentials

   Contributing factor

   Cache-masked failure

   Detection

   Automated synthetic checks that simulate SDK traffic for the Feature Flags service began failing at 1:47am GMT.

   Remediation

   • Restored the missing image to Google Artifact Registry
   • Redeployed the impacted pods

   Action items

   • Review and strengthen the image retention policies in Google Artifact Registry to prevent unintended deletions
   • Validate automatically that all production images are kept for a defined minimum period
   • Add monitoring and alerting for image pull errors

   View case

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