Issue
I'm currently writing a bash script and struggling with something that looked fairly simple at first.
I'm trying to create a function that calls a kubectl
(Kubernetes) command. The command is expecting the path to a file as an argument although I'd like to pass the content itself (multiline YAML text). It works in the shell but can't make it work in my function. I've tried many things and the latest looks like that (it's just a subset of the the YAML content):
#!/bin/bash
AGENT_NAME="default"
deploy_agent_statefulset() {
kubectl apply -n default -f - $(cat <<- END
kind: ConfigMap
metadata:
name: $AGENT_NAME
apiVersion: v1
data:
agent.yaml: |
metrics:
wal_directory: /var/lib/agent/wal
END
)
}
deploy_agent_statefulset
The initial command that works in the shell is the following.
cat <<'EOF' | NAMESPACE=default /bin/sh -c 'kubectl apply -n $NAMESPACE -f -'
kind: ConfigMap
...
I'm sure I m doing a lot of things wrong - keen to get some help
Thank you. name: grafana-agent
Solution
In your function, you didn't contruct stdin properly :
#!/bin/bash
AGENT_NAME="default"
deploy_agent_statefulset() {
kubectl apply -n default -f - <<END
kind: ConfigMap
metadata:
name: $AGENT_NAME
apiVersion: v1
data:
agent.yaml: |
metrics:
wal_directory: /var/lib/agent/wal
END
}
deploy_agent_statefulset
Answered By - Philippe Answer Checked By - David Marino (WPSolving Volunteer)