Minikube is great for having a Kubernetes cluster as local Docker development environment. In a development workflow you probably have source code on your host machine and it would be great if the Docker containers in the Kubernetes cluster could mount this. So changes made to the code can be tested and are visible quickly. The steps on this blog post are tested with Minikube version v0.28.0.
Mounting is possible for example with:
And by using hostPath in the volume.
For a client I automated the patching process of Linux operating systems and middleware. I create a python action for that in StackStorm. The script retrieved all servers from the CMDB and patched per data center.
Non cluster hosts parallel
All non cluster hosts where patched in parallel with the Python ParallelSSHClient.
Cluster hosts rolling upgrade
For hosts in a cluster it’s a bit harder. The minimum amount of nodes in a cluster is most of the time 3 and only one node can be down without downtime of the cluster. So a rolling upgrade is More >
Two years ago I wrote a tutorial to install a complete Postfix mail server with Dovecot, SpamAssassin and ViMbAdmin. At the moment I am automating this tutorial for CentOS 7 with Chef. For ViMbAdmin I created a recipe that clones the ViMbAdmin repository from Github, puts the configuration files from templates, creates the database, tables and inserts an admin user into the database. I thought it would be nice to share my vimbadmin recipe:
If you do a lot of Chef development, you are creating cookbooks with recipes. But also converging, testing and destroying virtual machines with Test Kitchen that uses Vagrant. In this process, virtual machines are often destroyed and build from the ground up. For every new build, all of the yum or debian packages must be downloaded and installed again. If your internet connection is not blazing fast, this will certainly slow down your work tempo a lot.
Install and configure Squid
Capistrano has the option to forward the local SSH agent to the remote server it wants to deploy on. But for this to work a SSH agent must be running and the key(s) you want to forward must be added to that SSH agent.
First I tried to start the SSH agent with the Capistrano deploy.rb recipe, but I could not get that to work and also the killing of the SSH agent afterwards could be a problem.
Eventually I solved it by adding the following line to the crontab of the deploy user. This line will be executed More >
This tutorial shows you how to install Postfix (2.9.6) with Dovecot (2.0.19), the manage tool Vimbadmin (2.2.2) and SpamAssassin (3.3.2) on Ubuntu Server 12.04 (I got feedback that this tutorial still works for Ubuntu Server 14.04).
If you are using Chef, “Install ViMbAdmin with Chef” can speed things up a bit.
Perform all actions as root!
You should check that your server has a valid fqdn hostname (complete with the domain part):
If you get something like “localhost” or “mail” More >
Vagrant is a very awesome tool that makes it very easy to develop your projects in virtual machines on your laptop or PC. It’s a wrapper around VirtualBox. It also makes them very easy to maintain and they can be used by a whole group of developers. This way all the developers that work on a project keep the same development environment. So that kicks the argument “But on my machine it works” out of the door.. finally!
Read all about it at http://www.vagrantup.com/.
There are a few provisioners available like Cheff, Puppet, More >