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kubernetes: Rollback a deployment update
2 min read
When performing rolling updates we can see it's history using kubectl rollout history:
$ kubectl rollout history deploy pet2cattle deployment.apps/pet2cattle REVISION CHANGE-CAUSE 100 <none> 101 <none> 102 <none> 103 <none> 104 <none> 105 <none> 106 <none> 107 <none> 109 kubectl scale deployment/pet2cattle --replicas=2 --record=true 110 kubectl scale deployment/pet2cattle --replicas=5 --record=true 111 kubectl scale deployment/pet2cattle --replicas=1 --record=trueIf have any problem with the update we can undo and update using kubectl rollout undo
25/05/2021
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kubernetes: Mount an existing EBS volume to a pod
2 min read
If you have an existing EBS volume that you want to use on your EKS cluster, or you don't want to let Kubernetes to manage your volumes, you can use awsElasticBlockStore to link an existing EBS volume to a PersistentVolume or use it directly as a volume on a pod spec:
24/05/2021
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How to generate a self-signed certificate using OpenSSL
2 min read
Using openssl we can create a self-signed using a non interactive command suitable for automation if we give all the information at once such as the CN, and the days to expire
21/05/2021
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terraform: one() function to retrieve the only element of a list
1 min read
On the terraform 0.15 CHANGELOG we can see that they have added the one function. This function is intended to simplify existing code, improving it's readability and further smoothen the terraform learning curve
20/05/2021
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Difference between git reset: soft vs hard
1 min read
To be able to partially apply commits to other branches some times comes handy to use git reset together with git stash.
With git reset we will be able to modify how the changes are stored on the repository. Let's see the differences between git reset --soft and git reset --hard.
19/05/2021
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