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I tried this script to see kubernetes volumes usage

k get pods -n elk | jq -s '[flatten | .[].pods[].volume[]? | select(has("pvcRef")) ''{name: .pvcRef.name, capacityBytes, usedBytes, availableBytes, ''percentageUsed: (.usedBytes / .capacityBytes * 100)}]'

got this

{name: .pvcRef.name, capacityBytes, usedBytes, availableBytes, percentageUsed: (.usedBytes / .capacityBytes * 100)}] jq: 1 compile error

My pods

 k get pods -n elk

k get pods -n elk

NAME READY STATUS RESTARTS AGE elasticsearch-master-0 1/1 Running 0 24d elasticsearch-master-1 1/1 Running 0 24d filebeat-filebeat-8jdqn 1/1 Running 0 24d filebeat-filebeat-vl9js 1/1 Running 0 24d filebeat-filebeat-xx2fm 1/1 Running 0 24d filebeat-filebeat-zdj5k 1/1 Running 0 22d kibana-kibana-9f5c6f974-kzzpr 0/1 Running 0 24d logstash-logstash-0 1/1 Running 26 (19h ago) 24d then k describe kibana

gives

Volumes: kube-api-access-2pizdku: Type: Projected (a volume that contains injected data from multiple sources) TokenExpirationSeconds: 3607 ConfigMapName: kube-root-ca.crt ConfigMapOptional: <nil>

And volume

 k get pv -n elk NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE pvc-0462020 30Gi RWO Delete Bound elk/elasticsearch-master-elasticsearch-master-1 default

Why?

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  • I recommend adding details, much more details... Commented Jan 20 at 16:45
  • Post the output of k get pods -n elk at least. Commented Jan 20 at 16:56
  • @choroba Added,pls take a look. Commented Jan 20 at 16:59
  • 1
    You get a syntax error because it's obviously not valid jq syntax. Those '' also suggest you may have messed up some copy-pasting. Commented Jan 20 at 17:07
  • 2
    Also, the output to jq should be a JSON. The output of k get pods -n elk doesn't look like JSON to me (unrelated to the error, though). Commented Jan 20 at 17:22

1 Answer 1

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Your jq expression, with extra whitespace inserted for readability:

[ flatten | .[].pods[].volume[]? | select(has("pvcRef")) { name: .pvcRef.name, capacityBytes, usedBytes, availableBytes, percentageUsed: (.usedBytes / .capacityBytes * 100) } ]

What's missing is a pipe symbol after the select() stage of the filter. Inserting it makes it syntactically correct:

[ flatten | .[].pods[].volume[]? | select(has("pvcRef")) | { name: .pvcRef.name, capacityBytes, usedBytes, availableBytes, percentageUsed: (.usedBytes / .capacityBytes * 100) } ]

Whether the expression is correct in all other senses is unknown, as I don't know what the input is expected to look like. The text quoted in the question isn't JSON, so jq wouldn't be able to apply the expression to it directly.

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