I'm not entirely sure if a Pod inherits the annotations of its owner (i.e. Deployment). Based on my experimentation it doesn't.
That said, the downward API <https://kubernetes.io/docs/tasks/inject-data-application/downward-api-volume-expose-pod-information/#the-downward-api> lets you read fields from Pod's spec. In this case, a Pod created by Deployment will have an metadata.ownerReferences field (array) referring to the "ReplicaSet" created by the Pod (and the ReplicaSet seems to be inheriting annotations of the Deployment). So, using the REST API/kubectl config passed to the Pod you can probably read the annotations of the RS. But this whole thing sounds like a hack, I would suggest explicitly passing this information in through an env var or a configmap. On Tue, May 1, 2018 at 12:27 PM Kir Shatrov <razor....@gmail.com> wrote: > Thanks for suggestion. I know there's a REST API or kubectl available > inside the pod, but I was wondering if it could be exposed in a different > way, perhaps similar to Downward API. > > On Tue, May 1, 2018 at 8:52 PM, David Rosenstrauch <dar...@darose.net> > wrote: > >> Actually, my bad - I didn't read your question carefully enough. You >> wanted to access that annotation, but from inside a pod. >> >> That can be done too. I've run scripts inside a pod that query the >> kubernetes api server for information like that. I don't have a code >> example for that handy, unfortunately, but it would be similar to my >> previous response, and look something like this: >> >> curl https://<kubernetes api>:443/api/... | jq -r >> '.items[].metadata.annotations' | less >> >> More details here: >> https://kubernetes.io/docs/tasks/administer-cluster/access-cluster-api/#without-kubectl-proxy >> >> HTH, >> >> DR >> >> >> On 05/01/2018 02:13 PM, David Rosenstrauch wrote: >> >>> kubectl get deployment myapp -o json >>> >>> You could then run it through a json parser to strip out what you want. >>> E.g.: >>> >>> kubectl get deployment -o json | jq -r '.items[].metadata.annotations' | >>> less >>> >>> HTH, >>> >>> DR >>> >>> On 05/01/2018 01:14 PM, Kir Shatrov wrote: >>> >>>> Hi all, >>>> >>>> I'm looking for some help with exposing annotations. >>>> >>>> Each Deployment gets this annotation: >>>> >>>> $ kubectl describe deployment/myapp >>>> Name: myapp >>>> Namespace: default >>>> CreationTimestamp: Sat, 24 Mar 2018 23:27:42 +0100 >>>> Labels: app=myapp >>>> Annotations: deployment.kubernetes.io/revision=5 >>>> >>>> Is there a way to read that annotation ( >>>> deployment.kubernetes.io/revision) >>>> from a pod that belongs to the deployment? >>>> >>>> I tried Downward API, but that only allows to expose annotations of the >>>> *pod >>>> itself* (not of its deployment). >>>> >>>> >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "Kubernetes user discussion and Q&A" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to kubernetes-users+unsubscr...@googlegroups.com. >> To post to this group, send email to kubernetes-users@googlegroups.com. >> Visit this group at https://groups.google.com/group/kubernetes-users. >> For more options, visit https://groups.google.com/d/optout. >> > > -- > You received this message because you are subscribed to the Google Groups > "Kubernetes user discussion and Q&A" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to kubernetes-users+unsubscr...@googlegroups.com. > To post to this group, send email to kubernetes-users@googlegroups.com. > Visit this group at https://groups.google.com/group/kubernetes-users. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Kubernetes user discussion and Q&A" group. To unsubscribe from this group and stop receiving emails from it, send an email to kubernetes-users+unsubscr...@googlegroups.com. To post to this group, send email to kubernetes-users@googlegroups.com. Visit this group at https://groups.google.com/group/kubernetes-users. For more options, visit https://groups.google.com/d/optout.
