I have misunderstanding with how to execute $() commands in exec. i'm creating a job in kubernetes with this params:
command:
- ./kubectl
- -n
- $MONGODB_NAMESPACE
- exec
- -ti
- $(kubectl
- -n
- $MONGODB_NAMESPACE
- get
- pods
- --selector=app=$MONGODB_CONTAINER_NAME
- -o
- jsonpath='{.items[*].metadata.name}')
- --
- /opt/mongodb-maintenance.sh
but the part with $(kubectl -n ... --selector ...) is treated as a string and don't execute. Please tell me how to do it properly. Thanks!
As far as I know this is not achievable by putting each section as an array element. Instead you can do something like the following:
command:
- /bin/sh
- -c
- |
./kubectl -n $MONGODB_NAMESPACE exec -ti $(kubectl -n $MONGODB_NAMESPACE get pods --selector=app=$MONGODB_CONTAINER_NAME -o jsonpath='{.items[*].metadata.name}') -- /opt/mongodb-maintenance.sh
From the output of the kubectl exec, I noticed that you can use -- to separate your arguments
# List contents of /usr from the first container of pod 123456-7890 and sort by modification time.
# If the command you want to execute in the pod has any flags in common (e.g. -i),
# you must use two dashes (--) to separate your command's flags/arguments.
# Also note, do not surround your command and its flags/arguments with quotes
# unless that is how you would execute it normally (i.e., do ls -t /usr, not "ls -t /usr").
kubectl exec 123456-7890 -i -t -- ls -t /usr
