Is there a way to get UID in pod spec
What I want to do is providing pod with unified log store, currently persisted to hostPath, but I also want this path including UID so I can easily get its path after pod destroyed.
For example:
apiVersion: v1
kind: Pod
metadata:
name: pod-with-logging-support
spec:
containers:
- image: python:2.7
name: web-server
command:
- "sh"
- "-c"
- "python -m SimpleHTTPServer > /logs/http.log 2>&1"
volumeMounts:
- mountPath: /logs
name: log-dir
volumes:
- name: log-dir
hostPath:
path: /var/log/apps/{metadata.uid}
type: DirectoryOrCreatemetadata.uid is what I want to fill in, but I do not how to do it.
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2 Answers
For logging it's better to use another strategy.
I suggest you to look at this link.
Your logs are best managed if streamed to stdout and grabbed by an agent, like shown in this picture:
Don't persist your log on filesystem, but gather them using an agent and put them together for further analysis.
Fluentd is very popular and deserves to be known.
After searching the doc from kubernetes, I finally see a solution for my specific problem. This feature is exactly what I wanted.
So I can create the pod with
apiVersion: v1
kind: Pod
metadata:
name: pod-with-logging-support
spec:
containers:
- image: python:2.7
name: web-server
command:
- "sh"
- "-c"
- "python -m SimpleHTTPServer > /logs/http.log 2>&1"
env:
- name: POD_UID
valueFrom:
fieldRef:
apiVersion: v1
fieldPath: metadata.uid
volumeMounts:
- mountPath: /logs
name: log-dir
subPath: $(POD_UID)
volumes:
- name: log-dir
hostPath:
path: /var/log/apps/
type: DirectoryOrCreate