docs: openshift+crc howto

CRC allows developers to install minimal OpenShift4 cluster on their
local host machine for testing. Provide minimal how-to documentations on
how to setup cluster with crc, deploy samba-operator with live share,
and test it using sambe toolbox.

Signed-off-by: Shachar Sharon <[email protected]>

Author: synarete

docs/howto-openshift-crc.md

@@ -0,0 +1,267 @@
+# Deploy samba-operator over OpenShift-CRC
+
+The following document describe how to deploy samba-operator and create
+SMB shares over OpenShift Container Platform 4 using
+[crc](https://crc.dev/crc/). This mode of operation is mainly targeted
+at running on developers' Linux desktops and requires
+[minimal system resources](https://crc.dev/crc/#minimum-system-requirements-hardware_gsg).
+It also requires virtualization enabled on your local machine.
+
+The instructions in this document were tested with the following
+settings:
+
+```sh
+  $ uname -msr
+  Linux 6.1.18-100.fc36.x86_64 x86_64
+  $ crc version
+  CRC version: 2.15.0+cc05160
+  OpenShift version: 4.12.5
+  Podman version: 4.3.1
+  $ qemu-kvm --version
+  QEMU emulator version 6.2.0 (qemu-6.2.0-17.fc36)
+```
+
+## Setup OpenShift CRC cluster
+Download openshift's crc to your local Linux machine using the
+[crc installing instructions](https://crc.dev/crc/#installing_gsg), and
+place the `crc` executable within your `PATH`. Ensure that you have a
+valid installation by [setting up crc](https://crc.dev/crc/#setting-up_gsg):
+
+```sh
+  $ crc version
+  $ crc config view
+  $ crc setup
+```
+
+Make sure that you have an updated pull-secret stored within a local
+file (`pull-secret.txt`), and then start a new crc instance with the
+following command (may take few minutes):
+
+```sh
+  $ crc start -p ./pull-secret.txt
+```
+
+Upon successful deployment, you should see information on how to access
+your cluster, similar to the following example:
+
+```sh
+Started the OpenShift cluster.
+
+The server is accessible via web console at:
+  https://console-openshift-console.apps-crc.testing
+
+Log in as administrator:
+  Username: kubeadmin
+  Password: Y7Dgu-IpHcX-N48UJ-ztphn
+
+Log in as user:
+  Username: developer
+  Password: developer
+
+Use the 'oc' command line interface:
+  $ eval $(crc oc-env)
+  $ oc login -u developer https://api.crc.testing:6443
+
+```
+
+Use the `oc` command line utility to ensure cluster's pods are alive
+and running:
+
+```sh
+  $ eval $(crc oc-env)
+  $ export KUBECTL_CMD=oc
+  $ $KUBECTL_CMD get pods -A
+```
+
+Note that some pods (e.g., `redhat-operators` and `redhat-marketplace`)
+may be in `ImagePullBackOff` status, which is fine in the context of
+this howto document.
+
+When done with the cluster, you may terminate its resources with:
+
+```sh
+  $ crc stop
+  ...
+  $ crc delete
+  ...
+```
+
+## Setup OpenShift samba-SCC
+Samba operator uses a custom
+[security-context-constraints](https://docs.openshift.com/container-platform/4.12/authentication/managing-security-context-constraints.html)
+(SCC) for its pods and containers. Before deploying the samba operator,
+the user should setup the `samba` SCC on the cluster. In order to
+deploy samba SCC manually, execute the following commands:
+
+```sh
+  $ cd samba-operator-dir
+  $ export KUBECTL_CMD=oc
+  $ $KUBECTL_CMD create -f config/openshift/scc.yaml
+  securitycontextconstraints.security.openshift.io/samba created
+  $KUBECTL_CMD get scc/samba -o yaml
+  ...
+```
+
+## Deploy samba-operator
+Enable developer mode and deploy the samba-operator using the top-level
+Makefile target `make-deploy`. Wait for the `samba-operator` pod to be in
+`Running` state:
+
+```sh
+  $ cd samba-operator-dir
+  $ export KUBECTL_CMD=oc
+  $ echo DEVELOPER=1 >> devel.mk
+  $ make deploy
+  ...
+  $ $KUBECTL_CMD get pods -n samba-operator-system
+  NAME                                                 READY   STATUS    RESTARTS   AGE
+  samba-operator-controller-manager-7c877459d4-wln54   2/2     Running   0          27s
+```
+
+## Create samba share
+Use the `smbtest.yaml` file below to simple SMB share. Wait for the share pod
+to be in `Running` state (may take some time):
+
+```sh
+  $ export KUBECTL_CMD=oc
+  $ $KUBECTL_CMD create -f smbtest.yaml
+  ...
+  $ $KUBECTL_CMD get pods -n smbtest
+  NAME                      READY   STATUS    RESTARTS   AGE
+  share1-5f7dbd45bc-bljrv   2/2     Running   0          4m23s
+```
+
+
+```yaml
+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: smbtest
+---
+apiVersion: v1
+kind: PersistentVolume
+metadata:
+  name: smb-pv
+  labels:
+    type: local
+spec:
+  storageClassName: manual
+  capacity:
+    storage: 8Gi
+  accessModes:
+    - ReadWriteOnce
+  hostPath:
+    path: "/mnt/export"
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: smb-pvc
+  namespace: smbtest
+spec:
+  storageClassName: manual
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 4Gi
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: users
+  namespace: smbtest
+type: Opaque
+stringData:
+  demousers: |
+    {
+      "samba-container-config": "v0",
+      "users": {
+        "all_entries": [
+          {
+            "name": "user1",
+            "password": "123456"
+          },
+          {
+            "name": "user2",
+            "password": "123456"
+          }
+        ]
+      }
+    }
+---
+apiVersion: samba-operator.samba.org/v1alpha1
+kind: SmbSecurityConfig
+metadata:
+  name: users
+  namespace: smbtest
+spec:
+  mode: user
+  users:
+    secret: users
+    key: demousers
+---
+apiVersion: samba-operator.samba.org/v1alpha1
+kind: SmbCommonConfig
+metadata:
+  name: config
+  namespace: smbtest
+spec:
+  network:
+    publish: cluster
+---
+apiVersion: samba-operator.samba.org/v1alpha1
+kind: SmbShare
+metadata:
+  name: share1
+  namespace: smbtest
+spec:
+  securityConfig: users
+  readOnly: false
+  storage:
+    pvc:
+      name: "smb-pvc"
+```
+
+## Test samba share using smbtoolbox
+Deploy smbtoolbox using the following configuration:
+
+```yaml
+---
+apiVersion: v1
+kind: Pod
+metadata:
+  namespace: smbtest
+  name: smbtoolbox
+  annotations:
+    openshift.io/scc: samba
+spec:
+  automountServiceAccountToken: true
+  containers:
+    - name: smbtoolbox
+      image: quay.io/samba.org/samba-toolbox:latest
+      command: ["sleep"]
+      args: ["100000"]
+```
+
+```sh
+  $ export KUBECTL_CMD=oc
+  $ $KUBECTL_CMD create -f smbtoolbox.yaml
+  ...
+  $ $KUBECTL_CMD get pods -n smbtest
+  NAME                      READY   STATUS    RESTARTS   AGE
+  share1-5f7dbd45bc-bljrv   2/2     Running   0          21m
+  smbtoolbox                1/1     Running   0          9m25s
+```
+
+Use the following shell commands and smbclient to test your smbshare:
+
+```sh
+  $ SHARE1_POD="$($KUBECTL_CMD get pods -n smbtest -l samba-operator.samba.org/service=share1 --template '{{(index .items 0).metadata.name}}')"
+  $ SHARE1_POD_IP=$($KUBECTL_CMD get pod $SHARE1_POD -n smbtest --template '{{.status.podIP}}')
+  $ $KUBECTL_CMD exec -it smbtoolbox -n smbtest -- smbclient -p 445 -U user1%123456 //$SHARE1_POD_IP/share1
+  smb: \>
+  ...
+
+```