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Running tcpdump on an OpenShift cluster
3 min read
If we want to take a look at the network traffic that we get out of an OpenShift node we can use the oc debug command to spin up a privileged pod with tcpdump installed. This way we don't need to ssh into the worker node.
22/05/2023
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Container with alpine failing to execute a file with not found
3 min read
While building a container using alpine as a base image we can get a not found error while trying to execute a file that doesn't make much sense:
$ docker run -it test /usr/local/bin/example-app exec /usr/local/bin/example-app: no such file or directory14/11/2022
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Using ephemeral containers
3 min read
Starting Kubernetes 1.23, ephemeral containers are enabled by default (in beta though). Using ephemeral containers we can now troubleshoot pods by deploying a temporary container into it with extra privileges or binaries to use
22/08/2022
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Troubleshooting a Pod by changing it's command
3 min read
When a container in a Pod is crashing sometimes it's logs are not enough to fully understand what's going on. One way to approach this situation the command it runs to something that won't make Kubernetes restart the container: For example a sleep command
08/03/2022
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How to debug a crossplane provider
4 min read
To be able to setup a crossplane provider there are some pieces that need to be aligned to be able to use it. For example, if we want to setup the AWS provider using an IAM Role for ServiceAccount. If something is missaligned, we might end up with an error while creating resources that doesn't really clarify what's the actual error:
$ kubectl describe bucket.s3.aws.crossplane.io/test-bucket Name: test-bucket Namespace: Labels: <none> Annotations: crossplane.io/external-name: pet2cattle-demo API Version: s3.aws.crossplane.io/v1beta1 Kind: Bucket Metadata: (...) Spec: (...) Provider Config Ref: Name: aws-provider Status: At Provider: Arn: Conditions: Last Transition Time: 2022-02-22T21:43:23Z Message: observe failed: failed to query Bucket: api error MovedPermanently: Moved Permanently Reason: ReconcileError Status: False Type: Synced Events: Type Reason Age From Message ---- ------ ---- ---- ------- Warning CannotObserveExternalResource 7s (x6 over 36s) managed/bucket.s3.aws.crossplane.io failed to query Bucket: api error MovedPermanently: Moved Permanently23/02/2022
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