Retrieve information from a configmap using jsonpath

Question

I have the following configmap where I want to retrieve the IPs using jsonpath how can that be done?

apiVersion: v1
data:
  domain.yaml: |
    dns:
      - 127.0.0.1
      - 127.0.0.2

I have tried the following which does not work: kubectl get cm domain -o jsonpath={.domain.yaml.dns[0]}

It's a string "domain.yaml": "dns: \n - 127.0.0.1\n - 127.0.0.1\n" — Osman Goni Nahid
– Osman Goni Nahid, Commented Aug 3, 2021 at 10:50

Dharman · Accepted Answer · 2021-08-03 10:45:17Z

1

this is not quite simple, as the

dns:
- 127.0.0.1
- 127.0.0.2

is interpreted as a single json value.

for example kubectl get cm testcm -o jsonpath='{.data}' returns the following output {"domain.yaml":"dns:\n - 127.0.0.1\n - 127.0.0.2\n"} as you can see it has "domain.yaml" as key, and the rest is a simple string value.

in order to get the ips, we can use jq and cut magic. For example

kubectl get cm testcm -o jsonpath='{.data.*}' | cut -d$'\n' -f2 | sed 's/  - //g'

would return 127.0.0.1

edited Aug 3, 2021 at 10:45

Dharman♦

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answered Aug 3, 2021 at 10:39

meaningqo

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