the node was low on resource ephemeral storage

THE NODE WAS LOW ON RESOURCE EPHEMERAL STORAGE FREE

For more details on this issue, the first place to check is the log output of the kubelet service on the node in question. apiVersion : v1Įven after adding the above limits and requests to my namespace, my pod is reaching its limits and then evicting. You may encounter a case where pods are being evicted from a node, and the 'describe' output reports that the kubelet is doing this to reclaim ephemeral storage. To overcome the above error, I have added ephemeral storage limits and request to my namespace. Container wso 2 am-gateway-am was using 406468 Ki, which exceeds its request of 0. Container xpaas-logger was using 30108 Ki, which exceeds its request of 0. And my pods are evicting repetively with the ephemeral storage issues.īelow is the error I am getting on Evicted pods: Message : The node was low on resource: ephemeral-storage. Particularly noisy processes can eat up a surprising amount of disk space in a short amount of time.I am running a k8 cluster with 8 workers and 3 master nodes. more local ephemeral storage than was accounted for in the nodes resource. This has the added benefit of making it easier to identify specific pods that are taking up disk space:įinally, be aware of the amount of logging that your pods are printing. In low resource situations, containers that specify no resource requests are. In addition, it can be helpful to establish specific Requests and Limits for the volumes that your pods are using, rather than leaving them unlimited. This may not be enough for certain workloads, so be sure to size this mount according to your needs. To resolve this issue, first be sure that the mount containing /var/lib/kubelet and /var/lib/containerd is configured to have at least the recommended minimum of 80GB: Neither of these cases will count towards 'Allocated Resources' but will still occupy disk space.

Pods can be configured to use emptyDir mounts without Requests or Limits configured, or there may be a large amount of logs being printed to this mount. The reason for this discrepancy is that the node's 'Allocated Resources' output only shows the Requests and Limits that you've configured for the pods that are scheduled on this node. It will look like the following:įilesystem Size Used Avail Use% Mounted on In most cases, the ephemeral mount will be located at '/'.

However, if you run a command such as 'df' on the impacted node, you can see actual usage. was using 56Ki, which exceeds its request of 0. Local SSDs provide higher throughput and lower latency than standard. This can be confusing, as the 'Allocated Resources' output for this node may not report very high disk usage. Status: Failed Reason: Evicted Message: The node was low on resource: ephemeral-storage. Local SSDs provide high-performance, ephemeral storage to every node in the cluster. It is also important to note that 'allocation' is a different value than 'usage'.

Unless you have configured your nodes differently, this will usually refer to the same mount - the location of /var/lib/kubelet, /var/log, and /var/lib/containerd, so you will encounter this issue when this mount reaches 85% of its total capacity. These values correspond to the 'nodefs' and 'imagefs' thresholds documented here: Messages like these indicate that the disk mount that corresponds to the kubelet or the kubelet's image store are over the maximum threshold and it needs to clear up space to prevent damage from happening to the cluster. The next question is : how pods with resource and limits are run/scheduled The scheduler computes the amount of CPU and memory.

THE NODE WAS LOW ON RESOURCE EPHEMERAL STORAGE FREE

Trying to free 2000000000 bytes down to the low threshold (80%). Look for entries like the following: Jan 28 16:09:51 node03 kubelet: I0128 16:09:51.448281 25570 image_gc_manager.go:305] : Disk usage on image filesystem is at 85% which is over the high threshold (85%). SSH into the node and run: journalctl -u kubelet network connectivity, and access to ephemeral storage (which is local to. You may encounter a case where pods are being evicted from a node, and the 'describe' output reports that the kubelet is doing this to reclaim ephemeral storage.įor more details on this issue, the first place to check is the log output of the kubelet service on the node in question. One node (machine) in the cluster acts as the head node that hosts all of the.

The node was low on resource ephemeral storage