How to Restart All Pods in a Kubernetes Namespace

How To Restart All Pods in a Kubernetes Namespace

The post How to Restart All Pods in a Kubernetes Namespace first appeared on Qvault.

Where I work we use a repo-per-namespace setup and so it is often the case that I want to restart all the pods and deployments in a single Kubernetes namespace. Maybe I want to see the startup logs, maybe I want to take down production for a few seconds, don’t question my motivations.

Anyhow, what does matter is that bouncing all the deployments one-by-one is really obnoxious and I don’t like typing. In true developer laziness fashion I wrote a little script that will do it for me:

deploys=`kubectl -n $1 get deployments | tail -n +2 | cut -d ' ' -f 1`
for deploy in $deploys; do
  kubectl -n $1 rollout restart deployments/$deploy
done

The usage is fairly simple, assuming we named the file kubebounce.sh

./kubebounce.sh {NAMESPACE}

I made a little open-source repo with installation instructions if you want to add it to your $PATH. Be sure to star the repo if you find it useful.

How It Works

Bash isn’t exactly the easiest language to read. Let’s go over each portion of the script.

deploys=`kubectl -n $1 get deployments | tail -n +2 | cut -d ' ' -f 1`

In bash, $1 refers to the first command-line argument, the namespace in our case. In essence, this line gets all the deployments in the target namespaces and saves them into a deploys variable. We pipe the output of the kubectl get deployments command into a tail -n +2 command, which just strips of the first line of the output. Then we run that output through a cut command which leaves us with a nice list of all the deployment names.

That’s actually the trickier part, next we just loop over all the deployments and restart them one-by-one:

for deploy in $deploys; do
  kubectl -n $1 rollout restart deployments/$deploy
done

Thanks For Reading!

Follow us on Twitter @q_vault if you have any questions or comments

Take some coding courses on our new platform

Subscribe to our Newsletter for more programming articles



source https://qvault.io/2020/10/26/how-to-restart-all-pods-in-a-kubernetes-namespace/

Comments

Post a Comment

Popular posts from this blog

Why is Exclusive Or (XOR) Important in Cryptography?

Image
If you are getting into cryptography, or just trying to understand the fundamentals, you may have noticed that the exclusive-or operation is used quite often, especially in ciphers. What is XOR ( ⊕ )? XOR, or “exclusive or” operates on binary data. It returns true if both of its inputs are opposites (one false and one true), otherwise, it returns false. An example in go code would be something like: func exclusiveOr(a bool, b bool) bool { return a != b } XOR Cipher – The Perfect Cipher The XOR operation can be used as a simple cipher for encrypting and decrypting messages with a single key. This is known as symmetric encryption. It is interesting to note that if: The key is the same size as the message The key is kept secret and generated truly randomly Then the cipher is impossible to crack. This is known as a one time pad . However, a simple XOR shouldn’t be used in production due to the key length needing to be too long to be practical. Cipher Example A
Read more

What are UUIDs, and should you use them?

Image
The post What are UUIDs, and should you use them? first appeared on Qvault . A universally unique identifier (UUID) is a 128-bit format for creating IDs in code that has become popular in recent years, especially in relation to database keys. By using UUIDs, you ensure that your ID is not just unique in the context of a single database table or web application, but is truly unique in the universe. No other ID in existence should be the same as yours. Sorry to interrupt! I just wanted to mention that you should check out my new free Go course. It’s designed to teach you all the fundamentals of my favorite coding language. Learn Golang Now It is important to note that while the probability that a UUID will collide with another is not zero , its practically zero. The chances of collision are so astronomically low, worrying about it would be ridiculous. The total number of possible UUIDs is 2^128 or 340282366920938463463374607431768211456 . UUID Generator Online
Read more

6 Things to Avoid When Contributing to Open-Source Projects

Image
The post 6 Things to Avoid When Contributing to Open-Source Projects first appeared on Qvault . With #HacktoberFest being a thing, there has been an influx of devs desperately trying to contribute to their favorite Open-Source projects. Unfortunately, many of these pull requests have been a waste of time, with the maintainers ultimately unable to use the contributions. Maintainers don’t want to waste their time reviewing bad PRs, and contributors don’t want to waste their time writing code that will never make it into production. Let’s take a look at some common pitfalls that developers fall prey to when working on an open-source project. As a side note, we recently open-sourced the Qvault front-end, so take a look at that if you want to help out. 1. Don’t Start Work Without Approval If you hop into a Github repo and find something you don’t like, don’t immediately open a pull request. Follow these steps instead: Is there already an issue logged? If not, make one. If there
Read more