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  1. IL-0081 API requests timed out during deployment rollouts because the ingress-nginx enable-serial-reloads option held back endpoint updates while a long NGINX reload was running
    Cresta2025
    Symptoms

    During a deployment, traffic into the Kubernetes cluster started hitting dead ends: some API requests timed out and requests were slow and disrupted while the rollout ran.

    Intermittent timeoutsStale endpoint routingHigh latency
    Trigger

    A deployment rollout changed backend endpoints while a long-running NGINX full reload was in progress, with the enable-serial-reloads option enabled on the ingress-nginx controller.

    Root cause
    Software defect
    Component
    Ingress controller
    Contributing factor
    –
    Remediation
    • restarted the NGINX Ingress controller as an attempt to resolve the problem
    Action items
    • Open an issue in kubernetes/ingress-nginx describing how enable-serial-reloads blocks dynamic endpoint updates
    Lessons

    A flag meant only to serialise full reloads also delayed endpoint updates, which opened a window during rollouts in which the ingress routed to pods that no longer existed. Options that change how the ingress controller applies configuration need to be checked against what happens to endpoint updates during a long reload.

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By root cause1

Software defect1 case

Component
Ingress controller
Contributing factor
–
Organisation
Cresta
  1. IL-0081 API requests timed out during deployment rollouts because the ingress-nginx enable-serial-reloads option held back endpoint updates while a long NGINX reload was running
    Cresta2025