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Initialise Python with GoCD

November 10, 2017Categories: IT, Tutorial
Following the deployment of a python-aware agent , we can start creating a pipeline. The first stage would be to: Clean up any previous data Create a virtual environment for python Install all dependencies from a requirements.txt file in our project Note: we assume the global pipeline settings…

Create a Python-friendly GoCD Agent in Docker

November 10, 2017Categories: IT, Tutorial
I've got two requirements to make GoCD useful: Run both the server and agent(s) in Docker Make it python-friendly Fortunately, GoCD offers Docker images (and Dockerfile s) for both, so it's just a matter of extending it: Unfortunately, pip is not quite adequate, so we re-install it from source…

Allow Docker Container Access Behind Proxy

November 10, 2017Categories: IT, Tutorial
In the previous post , I've described how to build an image when you're behind a proxy. Now, if your container needs access to the internet for e.g. downloading python dependencies, you'll need to give it explicitly. The way to do it is via -e parameter (environment) of docker run . You can…

Don't Symlink Indices in ElasticSearch!

November 9, 2017Category: IT
The other day I've been trying to improve the downtime when updating an index in elasticsearch (ES) and I've decided the best approach would be to create a new index and do a symlink to the active one, keeping the valid index. so, my structure would be: Note: this is likely not a best practice…

Show What's on Swap in Linux

November 6, 2017Categories: IT, Tutorial
If you find your machine running sluggish, it might be the case that you have too many things running and it's hitting the swap. You can check how bad (or good) things are with htop , but it won't tell you which process is sitting on swap. To find out, I've cooked up a tiny script: It will look in…

Fix Jenkins POM Freezer "Wrong Relative POM" Error

October 31, 2017Categories: IT, Tutorial
If you get a build error in Jenkins like: Then you have a POM freezing issue with the parent POM. I.e., the Jenkins plugin has failed to freeze the POM version from a 1.0-SNAPSHOT to an actual 1.0-6034-79 . A cause can be the plugin expects a certain sequence of tags in the POM and doesn't find…

Clean Up Your Zookeeper History

October 31, 2017Category: IT
TL;DR: Use zkCleanup.sh -n 5 command: By default, Zookeeper does not delete any of its history to allow recovery. This however can lead to disk space issues over long-ish periods of time. Therefore, it is advisable to clean up once in a while. Update: I found out that /usr/share/zookeeper/bin…

Redis on Windows - Save RDB but Not Able to Persist

September 23, 2017Categories: IT, Tutorial
TL;DR : My windows service wasn't installed properly. Change the config file to point the DB to an accessible directory and reinstall the service. When trying to build a perioduc Celery task, I got the following error with Redis on Windows (running as a windows service): redis.exceptions…

Check Computer Started without Admin Provileges

September 12, 2017Categories: IT, Tutorial
TL;DR : open the Event viewer , select the Windows Logs > System and Filter Current Log to the desired interval. Or you can scroll to the earliest entry of the day you need (more irritating because the event window doesn't refresh when scrolling). The other day I needed to find out when an…
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