Inject an Executable Script into a Container in Kubernetes
Inject an Executable Script into a Container
We want to execute a script inside a container
The Deployment
A volume is created from the ConfigMap with defaultMode: 0744, that’s what makes it executable. It’s then mounted to a /scripts dir but it could be mounted anywhere. The command: ["/scripts/wrapper.sh"] overrides the Docker image’s entry point and runs the wrapper.sh instead.
# cat deploy.yml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: ghost
labels:
role: blog
spec:
replicas: 1
template:
metadata:
labels:
role: blog
spec:
containers:
- name: ghost
image: ghost:0.11-alpine
command: ["/scripts/wrapper.sh"]
ports:
- name: ghost
containerPort: 2368
protocol: TCP
volumeMounts:
- name: wrapper
mountPath: /scripts
volumes:
- name: wrapper
configMap:
name: wrapper
defaultMode: 0744
The Code will Inject an Executable Script into a Container in Kubernetes
Relevant Blogs:
Persistent storage in kubernetes
Managing docker volumes using docker compose
Types of Nodes in Openstack
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