Posts

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• Quick introduction to using and serving Helm Charts

  Mar 24, 2019 · 2 min read

  For this posting I assume that kubectl and helm are installed and working. If unsure, this can be checked via kubectl get pods --all namespaces which should return a pod with the name tiller-deploy-[...]. For these examples I am using minikube. To create an initial helm chart, run the command helm create <name>. This creates a new chart template with the name <name>. Of course this should be replaced with the actual name. How to create the actual chart will be part of another blog entry. To package that chart, run the following.

  $ cd mychart/
  $ helm package .
  

  A webserver for hosting Charts is the Chartmuseum. Generally every server which can serve static files will work fine although the index.yaml has to be created. The quickest way for testing is to deploy the Chartmuseum via helm itself:

  $ helm install --set env.open.DISABLE_API=false stable/chartmuseum
  

  It is important to note that DISABLE_API needs to be set to false, otherwise no uploads will be possible. To upload the packaged chart to Chartmuseum, type the following curl command:

  $ curl --data-binary "@mychart-0.1.0.tgz" http://localhost:8080/api/charts
  

  Alternatively, the helm-push-plugin can be used with:

  helm plugin install https://github.com/chartmuseum/helm-push
  

  To use the chart in helm, the repository has to be registered with helm:

  $ helm repo add chartmuseum http://localhost:8080
  

  And then the chart can be pushed via:

  $ helm push mychart/ chartmuseum
  

  More information can be found in the Chartmuseum documentation. Lastly, this guide provides step-by-step information for using a helm chart repository. To test the newly uploaded chart the repositories need to be updated first with:

  $ helm repo update
  Hang tight while we grab the latest from your chart repositories...
  ...Skip local chart repository
  ...Successfully got an update from the "chartmuseum" chart repository
  ...Successfully got an update from the "stable" chart repository
  Update Complete. ⎈ Happy Helming!⎈
  

  Note: At the time of writing, helm does not automatically update the charts before installing and thus it is required to update before a search can occur. This feature is proposed for Helm 3. To show all charts of the helm simply run:

  $ helm search chartmuseum/
  

  You should now see your newly created chart.

• febase62 v1.1.0 now available

  Mar 4, 2019 · 1 min read

  I just released version 1.1.0 of febase62. With this update it is now possible to encode byte strings as base62. The method signature stays the same:

  >>> from febase62.base62 import Base62
  >>> encoder = Base62()
  >>> encoder.encode(b'\aa')
  '6Sd'
  

  The old way still works:

  >>> from febase62.base62 import Base62
  >>> encoder = Base62()
  >>> encoder.encode(1337)
  'LZ'
  

  The package can be installed via pip install febase62 and the source code can be found here.

• Creating UUID under Mac OS Shell

  Feb 25, 2019 · 1 min read

  I have the following alias in my .bashrc to create UUID’s quickly from the shell:

  alias uuid="uuidgen | tr -d - | tr -d '\n' | tr '[:upper:]' '[:lower:]' | pbcopy && pbpaste && echo"
  

  This generates a lowercase uuid and copies it to the clipboard all by calling uuid.

• Find all running java processes

  Feb 17, 2019 · 1 min read

  With the command jps you can find all running java processes. This is even faster than the example I showed in mid 2018 here.

  $ jps
  4979
  9683 Jps
  

• How to Delete Unused Google AppEngine Instances

  Feb 17, 2019 · 1 min read

  Google AppEngine only allows to have 15 instances maximum per project. I have set up a build pipeline which automatically deploys a new version every time I update this blog. To delete the older, no longer needed versions I am using this one liner:

  yes | gcloud app versions delete `gcloud app versions list --filter=TRAFFIC_SPLIT=0 | cut -c 10-24 | grep '[0-9]'`
  

  This deletes all versions which are not serving traffic. The only catch is that those versions need to have a number in it to be recognized via regex. In my case the versions automatically have the current date as name so that this isn’t a problem.

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