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Helm diff using a plugin
3 min read
Just as with kubectl diff, there's a helm plugin that helm us to the the actual differences that it will apply to the kubernetes cluster without much of the clutter that we will find by combining kubectl diff with the yaml output of a helm dry-run
15/01/2021
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Create a yaml template using kubectl
2 min read
When you create a new deployment you usually focus on:
- Number of replicas
- How you are going to select the pods that are going to be managed by this deployment
- Pod template
Beside this, all the other required lines on the yaml are boilerplate so it's quite easy to forget about them.
14/01/2021
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Installing kubectl plugin with krew: unused-pvc
2 min read
Krew is a plugin manager for kubectl (v1.12 or higher), we will need to install krew first. To be able to test the unused-volumes plugin we will have to create a PersistentVolumeClaim that we won't use on any pot:
apiVersion: v1 kind: PersistentVolumeClaim metadata: name: demo-pvc namespace: kube-system spec: accessModes: - ReadWriteOnce resources: requests: storage: 10Gi13/01/2021
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helm: set a value for a dependency
2 min read
If you are writing a helm chart, it makes no sense to add all the yaml files on your helm chart when there's already a helm chart for some of the components: It's always best to reuse existing code so including another chart as dependency will deploy all the related yaml files.
dependencies: - name: minio version: 8.0.8 repository: https://helm.min.io/Nevertheless, how do we change a default value for the chart we add as dependency?
12/01/2021
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Get YAML for deployed Kubernetes objects
2 min read
In case we have some objects on the kubernetes cluster that we want to modify but we don't have the original yaml, we can retrieve the object in yaml format from the cluster using kubectl
11/01/2021
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helm's dry-run mode to render yaml files without applying them
2 min read
When you are installing or upgrading a helm chart sometimes feels like an act of faith: You don't really know what it's going to actually deploy. With the --dry-run option
08/01/2021
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Preview changes before applying a yaml file to a kubernetes cluster
3 min read
Applying changes to a kubernetes cluster using yaml files it's very similar to applying changes to source code: It's always best to have the diff for being able to actually see the changed that we are going to make.
07/01/2021
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Usage of git stash
2 min read
While working on a change it can happen that someone else have updated the remote repository with completely unrelated changes. Instead of having to perform a merge commit we can download the changes to apply our changes on top of that commit.
06/01/2021
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Access kubernetes secrets as volumes
2 min read
To be able to use a secret on a Deployment (or generally speaking, any pod) we can choose to share it by using either volumes or environment variables. Let's take a look hwo it would look like using an volume mount.
05/01/2021
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kubectl top
2 min read
If we have the metrics-server installed on our kubernetes cluster, we can use kubectl to see the amount of resources out pods are using and how much loaded are our worker nodes
04/01/2021
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