Openshift - Correlation between confimap and pods - openshift

Question

there's a quick way/oc command to get which deployement use one or more configmap ?
In my case, I need to know which deployment I need to rollout to apply configmap update.
No evidence on dc YAML file.
Thanks in advance!

Answer 1

From guide in OpenShift 3.9
In DeploymentConfig this is the Stanza to pull all environment variables from a ConfigMap.
spec:
containers:
...
envFrom:
- configMapRef:
name: env-config
...
In might be worth grepping all your deploymentConfigs for the keyword configMap in a particular namespace/project to check you've got configMaps attached
$ oc get dc -o json -n $(oc project -q) | grep -A2 configMap
"configMapRef": {
"name": "printenv-config"
}
Assuming injecting environment variables from configmaps, there might be an easier way of doing this? - but you could also pipe into jq and filter based on the envFrom array key being not null
oc get dc -o json | jq -r '[.items[] | select(.spec.template.spec.containers[].envFrom[]? != null)]' | jq -c '.[] | {namespace: .metadata.namespace, dcname: .metadata.name, configMap: .spec.template.spec.containers[].envFrom[].configMapRef.name}'
Results in:
{"namespace":"aps-env","dcname":"openshift-tasks","configMap":"another-config-map"}
{"namespace":"aps-env","dcname":"printenv","configMap":"printenv-config"}
Alternatively you might be mounting your configMap via a volume mount, in which case the Stanza is different, and you'd need to adjust the above accordingly
"volumes": [
...
{
"configMap": {
"defaultMode": 420,
"name": "gogs"
},
"name": "config-volume"
}
...
Different Query based on Volume mounted configMap
$ oc get dc -o json | jq -r '[.items[] | select(.spec.template.spec.volumes[]?.configMap != null)]' | jq -c '.[] | {dcname: .metadata.name, configMapName: .spec.template.spec.volumes[].configMap.name}' | grep -v null
Results in:
{"dcname":"gogs","configMapName":"gogs-configmap"}