A Kubernetes addon for running an ephemeral container with a "mounted" volume.
Example:
mkdir -p ./stuff
echo "Test suite" > ./stuff/in.txt
kubectl ran busybox -e VAR1=Hello -e VAR2=world -v ./stuff:/stuff -- sh -c 'cp /stuff/in.txt /stuff/out.txt && echo "$VAR1 $VAR2" >> /stuff/out.txt'
cat ./stuff/out.txt
It works by
- Starting a container with
tail -f /dev/nullin a new pod. You can optionally specify environment variables. - Copies any "mounted" volumes into the container.
- Runs the specified command.
- Copies the "mounted" volumes back out of the container.
- Deletes the pod.
Requires the image contain tail and tar.
You can provide a file with --pod-file pod.yaml to specify additional options for the pod or add a sidecar, as in
spec:
containers:
- name: selenium
image: selenium/standalone-chrome
ports:
- name: selenium
containerPort: 4444
readinessProbe:
httpGet:
path: /
port: 4444
volumeMounts:
- mountPath: /dev/shm
name: dshm
volumes:
- name: dshm
emptyDir:
medium: Memory
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