matthewei/ironic-standalone-operator

WIP Operator to maintain an Ironic deployment for Metal3

Metal3 Ironic Operator

Operator to maintain an Ironic deployment for Metal3. See architecture for a quick overview of the deployed architecture.

This project is EXPERIMENTAL. It's not currently integrated will with other Metal3 components, not fully tested in the CI and is not ready to be used in production.

Usage

Let's assume we're creating an Ironic deployment called ironic in the namespace test, and that BMO will access it via https://ironic.test.svc.

Start with creating a TLS certificate and a secret for it. In this example, I'll use a self-signed certificate, you may want to sign it with some authority, e.g. using built-in Kubernetes facilities.

openssl req -x509 -new -subj "/CN=ironic.test.svc" -addext \
        "subjectAltName = DNS:ironic.test.svc" -newkey ec -pkeyopt \
        ec_paramgen_curve:secp384r1 -nodes -keyout tls.key -out tls.crt
kubectl create secret tls ironic-tls -n test --key="tls.key" --cert="tls.crt"

Now create the Ironic configuration:

---
apiVersion: metal3.io/v1alpha1
kind: Ironic
metadata:
  name: ironic
  namespace: test
spec:
  tlsRef:
    name: ironic-tls
  ramdiskSSHKey: "<YOUR SSH PUBLIC KEY HERE>"

kubectl create -f ironic.yaml

After some time, you can check the outcome:

$ kubectl describe ironic -n test ironic
...
Status:
  Conditions:
    Last Transition Time:  2023-08-25T13:05:35Z
    Message:               ironic is available
    Observed Generation:   2
    Reason:                DeploymentAvailable
    Status:                True
    Type:                  Ready

Now you can see the service that can be used to access Ironic (it has the same name as the Ironic object):

$ kubectl get service -n test ironic
NAME     TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)   AGE
ironic   ClusterIP   10.96.107.239   <none>        443/TCP   156m
$ # From inside the cluster, ignoring TLS certificates for now:
$ curl -k https://10.96.107.239/

The autogenerated credentials secret is linked in the spec:

$ IRONIC_SECRET=$(kubectl get ironic -n test ironic -o \
    jsonpath='{.spec.credentialsRef.name}')
$ IRONIC_USER=$(kubectl get secret -n test "$IRONIC_SECRET" -o \
    jsonpath="{.data.username}" | base64 --decode)
$ IRONIC_PASSWORD=$(kubectl get secret -n test "$IRONIC_SECRET" -o \
    jsonpath="{.data.password}" | base64 --decode)
$ # From inside the cluster, accessing an authenticated endpoint:
$ curl -k -u "$IRONIC_USER:$IRONIC_PASSWORD" https://10.96.107.239/v1/drivers

By its nature, Ironic listens on a host network and thus is reachable on one of the Kubernetes nodes, even from the outside (note the port):

$ kubectl get pod -n test -l \
    metal3.io/ironic-standalone-operator=ironic-service -o wide
NAME                              READY   STATUS    RESTARTS   AGE    IP            NODE                 NOMINATED NODE   READINESS GATES
ironic-service-698899755d-6xzxl   4/4     Running   0          152m   10.89.0.2     kind-control-plane   <none>           <none>
$ curl -k -u "$IRONIC_USER:$IRONIC_PASSWORD" https://10.89.0.2:6385/v1/drivers

More detailed example

In this example, a MariaDB database is used instead of SQLite, and a provisioning network is configured.

You will need to generate your TLS certificates with one more subjectAltName in the format <database name>-database.<namespace>.svc (in this example, ironic-database.test.svc). See architecture guide for details.

Then another resource needs to be created for the database itself:

---
apiVersion: metal3.io/v1alpha1
kind: IronicDatabase
metadata:
  name: ironic
  namespace: test
spec:
  tlsRef:
    name: ironic-tls
---
apiVersion: metal3.io/v1alpha1
kind: Ironic
metadata:
  name: ironic
  namespace: test
spec:
  databaseRef:
    name: ironic
  tlsRef:
    name: ironic-tls
  networking:
    ipAddress: 10.89.0.2
    dhcp:
      networkCIDR: 10.89.0.1/24
      rangeBegin: 10.89.0.10
      rangeEnd: 10.89.0.100
  ramdiskSSHKey: "<YOUR SSH PUBLIC KEY HERE>"

This example also shows configuring DHCP for network booting.

OpenShift notes

• Running a database requires the user to have nonroot or similar SCC.
• Running Ironic requires nonroot and hostnetwork.