kexpand is a tool for expanding Kubernetes placeholder variables into their actual values.
kexpand turns this:
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: $((name))
spec:
replicas: $((replicas))
template:
metadata:
labels:
app: $((name))
spec:
containers:
- name: $((name))
image: tutum/hello-world
ports:
- containerPort: 80
Into this:
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: hello-world
spec:
replicas: 3
template:
metadata:
labels:
app: hello-world
spec:
containers:
- name: hello-world
image: tutum/hello-world
ports:
- containerPort: 80
Build the code (make sure you have set GOPATH):
go get -d github.com/kopeio/kexpand
cd ${GOPATH}/src/github.com/kopeio/kexpand
make
The expand command will output the result of replacing all variables in the template file with the values from the
provided values file:
kexpand expand deployment.yaml -f values.yaml
deployment.yaml:
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: $((name))
spec:
replicas: $((replicas))
template:
metadata:
labels:
app: $((name))
spec:
containers:
- name: $((name))
image: tutum/hello-world
ports:
- containerPort: 80
values.yaml:
name: hello-world
replicas: 3
The result of expanding the template will be output to stdout, where it can be redirected to a file or piped to kubectl:
kexpand expand deployment.yaml -f values.yaml | kubectl create -f -
kexpand supports two different forms of variables: $((key)) will output a non-quoted value ($((replicas)) => 3),
while $(key) will output a quoted value ($(replicas) => "3"). A legacy format, {{key}}, is also supported, but
not recommended for use.
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