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# Demo: change replicas
Define a place to work:
<!-- @makeWorkplace @testAgainstLatestRelease -->
```
DEMO_HOME=$(mktemp -d)
```
Make a `kustomization` containing a deployment resource with replicas
<!-- @createKustomization @testAgainstLatestRelease -->
```
cat <<EOF >$DEMO_HOME/kustomization.yaml
resources:
- deployment.yaml
replicas:
- name: myapp
count: 3
EOF
```
Declare the deployment resource
<!-- @createDeployment @testAgainstLatestRelease -->
```
cat <<EOF >$DEMO_HOME/deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: myapp
name: myapp
spec:
replicas: 1
selector:
matchLabels:
app: myapp
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: myapp-container
image: busybox:1.29.0
EOF
```
The `myapp` resource declares an deployment managing a pod running a busybox container.
Now build this `kustomization`
<!-- @kustomizeBuild @testAgainstLatestRelease -->
```
kustomize build $DEMO_HOME
```
Confirm that this replaces replicas for myapp:
<!-- @confirmImages @testAgainstLatestRelease -->
```
test 3 = \
$(kustomize build $DEMO_HOME | grep replicas | awk '{print $2}'); \
echo $?
```
|
