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kubectl: Set default container
2 min read
One of the many improvements we get in Kubernetes 1.27 is the ability to set what's the default container:
apiVersion: v1 kind: Pod metadata: name: multi-container-pod spec: containers: - image: alpine:latest name: one command: - sh - -c - 'while true; do echo one; sleep 1m; done' - image: alpine:latest name: two command: - sh - -c - 'while true; do echo two; sleep 2m; done' - image: alpine:latest name: three command: - sh - -c - 'while true; do echo tree; sleep 3m; done'01/06/2023
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Managing Environment Variables with kubectl
2 min read
In today's highly dynamic and containerized environments, managing environment variables is crucial for configuring applications effectively. With the Kubernetes command-line tool, kubectl, you can imperatively set or remove environment variables for your existing objects.
21/05/2023
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Import a ServiceAccount token into kubeconfig
2 min read
To locally run some process we might need to use some ServiceAccount credentials to make sure it has the same exact permissions it would have running it as a Pod. To do se we can import the ServiceAccount token into our kubeconfig to be able to impersonate it.
29/05/2023
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Use a letsencrypt certificate on Kubernetes with cert-manager and Traefik
4 min read
To be able to automatically request letsencrypt certificates for the TLS-eanble Ingress objects in a kubernetes cluster with the traefik ingress controller we can use the cert-manager controller.
23/05/2023
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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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Kubernetes:
container orchestration
