Docker

Anyone who is evaluating into having a networking solution for their kubernetes cluster without having a lot of moving parts in the cluster, kuberouter provides pod networking, ability to enforce network policies, IPVS/LVS service proxy among other things. The problem which we faced specifically while running this in our clusters was missing routes upon restart of the node, or sometimes in the case when the node was joining the cluster as part of the worker node. ...

Update I gave a quick lightening talk about the same talk @ DevopsDays India, 2019. The slides for which can be found below What canary can be Shaping the traffic in a way, so that we could direct a % of traffic to the new pods and promoting the same deployment to a full scaleout and gradually phasing out the older release. Why canary? Testing on staging doesn’t weed out all the possible reasons for something failing, final testing for a feature being done on some part of the traffic is not something unheard of. Canary being a precursor to enable full blue green deployments. ...

When the power goes off in a device in a linux based system, one can think of ways in which this event can be handled in the applications running on it. One thing to note is that, when you plug the power cable off, the power doesn’t really go off immediately. But this needs to be notified to processes so that they can handle such an event and save the state of the application (if any). ...

While you might have read posts about docker being dead, but given its adoption. That’s not really the case. While we have other container runtimes like runc, containerd, rkt and some others. Docker is still something which a lot of folks running containers use as their container runtime. What this post will describe is one of the many approaches of structuring your container images, keeping in mind reusability, security and best practices in mind and keeping them as lightweight as possible. At the time of writing this, this is something which is still used to run production container workloads in my last company. ...