Deploy a basic application
All of the standard Kubernetes management tools can be used to maintain and modify your MicroShift applications. Below we will show some examples using oc, kustomize, and helm to deploy and maintain applications.
Example Applications
Metal LB
Metal LB is a load balancer that can be used to route traffic to a number of backends.
Creating the Metal LB namespace and deployment.
oc apply -f https://raw.githubusercontent.com/metallb/metallb/v0.11.0/manifests/namespace.yaml
oc apply -f https://raw.githubusercontent.com/metallb/metallb/v0.11.0/manifests/metallb.yaml
Once the components are available, a ConfigMap is required to define the address pool for the load balancer to use.
Create the Metal LB ConfigMap:
oc create -f - <<EOF
apiVersion: v1
kind: ConfigMap
metadata:
namespace: metallb-system
name: config
data:
config: |
address-pools:
- name: default
protocol: layer2
addresses:
- 192.168.1.240-192.168.1.250
EOF
Now we are able to deploy a test application to verify thing are working as expected.
oc create ns test
oc create deployment nginx -n test --image nginx
Create a service:
oc create -f - <<EOF
apiVersion: v1
kind: Service
metadata:
name: nginx
namespace: test
annotations:
metallb.universe.tf/address-pool: default
spec:
ports:
- port: 80
targetPort: 80
selector:
app: nginx
type: LoadBalancer
EOF
Verify the service exists and that an IP address has been assigned.
oc get svc -n test
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
nginx LoadBalancer 10.43.183.104 192.168.1.241 80:32434/TCP 29m
Using your browser you can now access the NGINX application by the EXTERNAL-IP provided by the service.