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kubectl-jq reviews and mentions
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An Introduction to JQ
Big fan of JQ. I like it more than the traditional UNIX suite of text manipulation commands, because I get closer to "querying" rather than just filtering. It has really made me rethink where I want "interacting with a computer" to go in the future -- less typing commands, more querying stuff.
I have a few utilities involving JQ that I wrote.
For structured logs, I have jlog. Pipe JSON structured logs into it, and it pretty-prints the logs. For example, time zones are converted to your local time, if you choose; or you can make the timestamps relative to each other, or now. It includes jq so that you can select relevant log lines, delete spammy fields, join fields together, etc. Basically, every time you run it, you get the logs YOU want to look at. https://github.com/jrockway/json-logs. Not to oversell it, but this is one of the few pieces of software I've written that passes the toothbrush test -- I use it twice a day, every day. All the documentation is in --help; I should really paste that into the Github readme.
I am also a big fan of using JQ on Kubernetes objects. I know what I'm looking for, and it's often not in the default table view that kubectl prints. I integrated JQ into a kubectl extension, to save you "-o json | jq" and having to pick apart the v1.List that kubectl marshals objects into. https://github.com/jrockway/kubectl-jq. That one actually has documentation, but there is a fatal flaw -- it doesn't integrate with kubectl tab completion (limitation of k8s.io/cli-runtime), so it's not too good unless you already have a target in mind, or you're targeting everything of a particular resource type. This afternoon I wanted to see the image tag of every pod that wasn't terminated (some old Job runs exist in the namespace), and that's easy to do with JQ: `kubectl jq pods 'select(.status.containerStatuses[].state.terminated == null) | .spec.containers[].image'`. I have no idea how you'd do such a thing without JQ, probably just `kubectl describe pods | grep something` and do the filtering in your head. (The recipes in the kubectl-jq documentation are pretty useful. One time I had a Kubernetes secret that had a key set to a (base64-encoded) JSON file containing a base64-encoded piece of data I wanted. Easy to fix with jq; `.data.THING | @base64d | fromjson | .actualValue | @base64d`.
JQ is something I definitely can't live without. But I will admit to sometimes preprocessing the input with grep, `select(.key|test("regex"))` is awfully verbose compared to "grep regex" ;)
Stats
jrockway/kubectl-jq is an open source project licensed under Apache License 2.0 which is an OSI approved license.
The primary programming language of kubectl-jq is Go.