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mkdit: Yet another cure for your mistyping
3 min read
It is quite anoying when you keep typing mkdit instead of mkdir for creating a directory just as it is to type sl instead of ls. At least, for sl there's an actual Debian package that, the Steam Locomotive. Having this in mind I created another tool called mkdir:
https://github.com/jordiprats/bash-mkdit
Using this as an example we will configure a github action to build .deb and .rpm packages for this tool.
22/01/2021
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How to trigger a Kubernetes cronjob
2 min read
If you deploy a Cronjob on Kubernetes it can be useful to test it out by manually triggering a run rather than to wait until it is run according by it's schedule.
Let's assume we have the following Cronjob that we want to run:
$ kubectl get cronjob NAME SCHEDULE SUSPEND ACTIVE LAST SCHEDULE AGE pet2cattle-sitemapgen 0 5 * * * False 0 <none> 13m21/01/2021
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Create a cronjob on a kubernetes cluster
3 min read
The cronjob object haven't been GA until Kubernetes v1.21, even though the Job object have been GA for a long time. Let's take a look how it works:
$ kubectl create job demo --image nginx --dry-run=client -o yaml | head -n1 apiVersion: batch/v1 $ kubectl create cronjob demo --image nginx --schedule="*/1 * * * *" -o yaml --dry-run=client | head -n1 apiVersion: batch/v1beta120/01/2021
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Creating a kubernetes cluster with multiple nodes using minkube
6 min read
Minikube is very useful for creating mockup environments for testing purposes, but it can be also use for studying yout CKA certification. Some topics, like node affinity or node failure will require you to have a multinode cluster but you can still use minikube
19/01/2021
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Rollback an upgrade using helm
3 min read
When we upgrade an application using helm it can always go something wrong so instead of upgrading to another version or uninstall / install the application, we can rollback to a previous version that we know it is working
Previously we already talked about the helm history command
$ helm history pet2cattle REVISION UPDATED STATUS CHART APP VERSION DESCRIPTION 60 Wed Dec 30 16:17:58 2020 superseded pet2cattle-1.7 2.8 Upgrade complete 61 Fri Jan 1 21:45:07 2021 superseded pet2cattle-2 3 Upgrade complete 62 Sat Jan 2 11:57:26 2021 superseded pet2cattle-2 3.1 Upgrade complete 63 Sat Jan 2 22:09:24 2021 superseded pet2cattle-2 3.2 Upgrade complete 64 Mon Jan 4 09:33:53 2021 superseded pet2cattle-2 3.3 Upgrade complete 65 Tue Jan 5 07:57:53 2021 superseded pet2cattle-2 3.4 Upgrade complete 66 Wed Jan 6 15:25:30 2021 superseded pet2cattle-2 3.5 Upgrade complete 67 Thu Jan 7 09:10:07 2021 superseded pet2cattle-2 3.6 Upgrade complete 68 Fri Jan 8 08:17:56 2021 superseded pet2cattle-2 3.7 Upgrade complete 69 Sat Jan 9 19:23:25 2021 deployed pet2cattle-2 3.8 Upgrade completeLet's assume that the latest deployed versions is not working.
18/01/2021
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