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A simple JSON log prettifier tool.
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flowerinthenight/pretty
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pretty is a simple wrapper tool that prettifies a process's stdout/stderr's JSON output line by line. If output line is not a valid JSON, or does not contain a valid JSON, it will just print the line as is. It also works in "follow" mode, such astail -f ... orkubectl logs -f ....
It also works withhttps://github.com/wercker/stern (which I use a lot), that is, the JSON log has a text prefix (pod name instern's case). It will print the text prefix first, then append the prettified JSON. To enable color forstern, you can try the following command:
$ pretty --stern=true -- stern<some-pod/svc> -s 24h
Example: (normal JSON logs using logrus, redacted)
$ kubectl logs -f svc-699544fd4d-zzlcf...{"action":"describe-deployments","http_method":"GET","level":"info","service":"stack","time":"..."...}{"context":"metrics-middleware","http_method":"GET","level":"info","service":"stack","time":"..."...}{"action":"encode-response","http_method":"GET","level":"info","msg":"marshal response as is"...}...Example: (wrapped by pretty, redacted)
$ pretty -- kubectl logs -f svc-699544fd4d-zzlcf...2018/05/11 14:58:45 [stdout] {"action":"describe-deployments","http_method":"GET","level":"info","msg":"describe={Type:compute.v1.instance Zone:asia-northeast1-a Name:...}","request":"92b86ab1-7c8e-4f77-871a-7caf132b421e","service":"stack","time":"2018-05-11T05:58:45Z"}2018/05/11 14:58:45 [stdout] {"context":"metrics-middleware","http_method":"GET","level":"info","msg":"fn=DescribeDeployment, duration=1.561291986s","request":"92b86ab1-7c8e-4f77-871a-7caf132b421e","service":"stack","time":"2018-05-11T05:58:45Z"}2018/05/11 14:58:45 [stdout] {"action":"encode-response","http_method":"GET","level":"info","msg":"marshal response as is","request":"92b86ab1-7c8e-4f77-871a-7caf132b421e","time":"2018-05-11T05:58:45Z"}...$ go get -u -v github.com/flowerinthenight/pretty
You can prepend the command that you want to prettify withpretty [flags] --. The double-dash will ensure that any succeeding flags belong to the wrapped command, not topretty.
$ pretty -- kubectl logs -f svc-699544fd4d-zzlcf