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Knowledge Base & Operational DocumentationContainers, Kubernetes & Platform Engineering
Why Does a Kubernetes CronJob Start More Than One Job for the Same Schedule?
A Kubernetes CronJob can create overlapping work when an earlier run takes longer than its schedule, a controller misses and catches up, or retries are mistaken for new runs. Duplicate jobs can repeat payments, reports, or data updates if the workload is not idempotent. What to check Inspect CronJob concurrency policy, schedule timezone, job history,...
How to Troubleshoot a Kubernetes Node That Becomes NotReady Repeatedly
A node that repeatedly becomes NotReady can disrupt workloads and trigger rescheduling. The cause may be resource pressure, a failing kubelet, container runtime errors, network loss, or storage problems rather than the application pods themselves. What to investigate Review node conditions, kubelet and runtime logs, resource pressure, disk and inode...
How to Investigate Kubernetes Pods Evicted for Ephemeral Storage
Pods can be evicted when writable layers, logs, or temporary files consume node storage. Increasing persistent volume size may not help if the usage comes from ephemeral container storage or unbounded logs. What to check Review eviction events, node disk and inode pressure, container writable-layer usage, log growth, temporary directories, and...
Why Does a Kubernetes Pod Run Out of Memory Even When the Node Has Free RAM?
A container can be killed for exceeding its own memory limit even while the Kubernetes node has free memory. The pod limit, application heap settings, sidecars, and burst patterns determine whether the workload reaches its ceiling. What to check Check container and pod memory limits, working set and peak usage, restart reason, sidecar consumption, and...
How to Diagnose Kubernetes Image Pull Failures After a Registry Credential Rotation
A pod may fail to start when the registry credential is missing, expired, attached to the wrong namespace, or inaccessible from the node. The image name or tag may also reference a repository the workload identity cannot read. What to check Inspect pod events, image reference, pull secret namespace and service account association, registry permissions,...
How to Troubleshoot Kubernetes Applications That Fail After a Secret Update
A Kubernetes Secret update may not be picked up by an application that reads it only at startup, or a mounted file can change while the application keeps using an old connection. A rollout can also reference the wrong secret name or namespace. What to check Check secret version and namespace, pod template references, mount behavior, environment...
How to Troubleshoot a Kubernetes Application That Cannot Reach an External API
A Kubernetes workload may be healthy internally but unable to reach an external provider because of egress policy, DNS, proxy settings, NAT capacity, TLS trust, or rate limits. Other workloads on the cluster may use a different network path. What to check Test DNS and connectivity from the affected pod or an approved diagnostic workload. Review network...
How to Troubleshoot a Kubernetes Pod That Cannot Write to a Persistent Volume
A pod may mount a persistent volume successfully but lack permission to write because of filesystem ownership, storage access mode, security context, or a read-only mount. The issue can affect only one workload using the same storage class. What to check Check mount status, volume and claim events, pod security context, filesystem ownership, access...