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How to add entries to a pod's /etc/hosts file
2 min read
The /etc/hosts file is a Kubernetes-managed file so we cannot add entries freely to it. If we want to add entries to it we will have to use the hostAliases field in the Pod's spec.
$ kubectl exec -it demo-pod -- cat /etc/hosts # Kubernetes-managed hosts file. 127.0.0.1 localhost ::1 localhost ip6-localhost ip6-loopback fe00::0 ip6-localnet fe00::0 ip6-mcastprefix fe00::1 ip6-allnodes fe00::2 ip6-allrouters 10.103.198.74 demo-pod11/05/2021
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AWS EKS: How to resize Persistent Volumes
3 min read
On a AWS EKS cluster, at the time of this writing, by default you cannot resize volumes provisioned with the default gp2 StorageClass. This is because on the default StorageClass the allowVolumeExpansion is set to false, preventing the volume expansion:
$ kubectl get sc NAME PROVISIONER RECLAIMPOLICY VOLUMEBINDINGMODE ALLOWVOLUMEEXPANSION AGE gp2 (default) kubernetes.io/aws-ebs Delete WaitForFirstConsumer false 78d10/05/2021
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terraform state list: List resources from the terraform state
1 min read
To be able to get a list of resources managed by terraform we can use terraform state list for listing all the resources on the terraform state:
07/05/2021
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formatting Terraform code
2 min read
One of the nicest functions terraform has is terraform fmt: Just as go fmt would do with Go code, it will rewrite Terraform configuration files (.tf and .tfvars files) to a canonical format and style. This will improve it's readability, helping making the code more consistent.
06/05/2021
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Kubernetes: Image pull policies
2 min read
On Kubernetes we can configure using the Pod manifest under which conditions we want to query the container registry to pull images by using the imagePullPolicy setting. We can configure the it on several objects like Deployment, StatefulSet, Pod, Job... In fact, we can set it on any object that includes a Pod template
apiVersion: v1 kind: Pod metadata: name: test-pod namespace: demo spec: containers: - image: alpine imagePullPolicy: IfNotPresent (...)05/05/2021
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