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annotate dns_k8s_check.py @ 59:fa7a71b8a97f

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more dns checks, including from inside containers in k8s`
author drewp@bigasterisk.com
date Sun, 01 May 2022 23:30:09 -0700
parents
children fb68881b79a0
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59
fa7a71b8a97f more dns checks, including from inside containers in k8s`
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1 import json
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2 import subprocess
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3
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4 subprocess.check_call(["skaffold", "run"], cwd="/my/proj/infra/k8s_lookup/")
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5
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6 try:
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7 j = subprocess.check_output(['kubectl', 'get', 'pod', '-o', 'json', '--selector', 'name=k8s-lookup'])
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8 pods = json.loads(j)['items']
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9 for lookupName in [
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10 'bang',
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11 'bang.bigasterisk.com',
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12 'bang.bigasterisk.com.',
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13 'mongodb.default.svc.cluster.local',
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14 'mongodb.default.svc.cluster.local.',
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15 ]:
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16 for pod in pods:
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17 runningOn = pod['spec']['nodeName']
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18 podName = pod['metadata']['name']
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19
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20 r = subprocess.run(
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21 ['kubectl', 'exec', f'pod/{podName}'] + ['--'] + #
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22 ['dnsget', '-q', lookupName],
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23 capture_output=True)
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24 result = (r.stdout + r.stderr).decode('ascii').strip().replace('\n', '; ')
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25 print(f'looked up {lookupName} from pod on {runningOn} -> {result}')
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26
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27 finally:
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28 subprocess.check_call(["skaffold", "delete"], cwd="/my/proj/infra/k8s_lookup/")