From 18d9ac2ca0081b25a3328d23a3632f536734fa66 Mon Sep 17 00:00:00 2001
From: marcel-dempers <aimvec@gmail.com>
Date: Tue, 14 Sep 2021 12:59:35 +1000
Subject: [PATCH] rbac

---
 kubernetes/rbac/README.md        | 32 ++++++++++++++++++++++++++++----
 kubernetes/rbac/pod.yaml         |  4 ++--
 kubernetes/rbac/role.yaml        |  4 ++--
 kubernetes/rbac/rolebinding.yaml |  4 ++--
 4 files changed, 34 insertions(+), 10 deletions(-)

diff --git a/kubernetes/rbac/README.md b/kubernetes/rbac/README.md
index f3262c431..560b3abd3 100644
--- a/kubernetes/rbac/README.md
+++ b/kubernetes/rbac/README.md
@@ -122,7 +122,7 @@ export KUBECONFIG=~/.kube/new-config
 Create a cluster entry which points to the cluster and contains the details of the CA certificate:
 
 ```
-kubectl config set-cluster dev-cluster --server=https://127.0.0.1:51972 \
+kubectl config set-cluster dev-cluster --server=https://127.0.0.1:52794 \
 --certificate-authority=ca.crt \
 --embed-certs=true
 
@@ -131,9 +131,9 @@ nano ~/.kube/new-config
 ```
 
 
-kubectl config set-credentials bob --client-certificate=bob.crt  --client-key=bob.key
+kubectl config set-credentials bob --client-certificate=bob.crt  --client-key=bob.key --embed-certs=true
 
-kubectl config set-context dev --cluster=dev-cluster --namespace=shopping --user=bob
+kubectl config set-context dev --cluster=dev-cluster --namespace=shopping --user=bob 
 
 kubectl config use-context dev
 
@@ -144,6 +144,7 @@ Error from server (Forbidden): pods is forbidden: User "Bob Smith" cannot list r
 ## Give Bob Smith Access
 
 ```
+cd kubernetes/rbac
 kubectl create ns shopping
 
 kubectl -n shopping apply -f .\role.yaml
@@ -163,9 +164,21 @@ Most business apps will not need to connect to the kubernetes API unless you are
 Generally applications will use a service account to connect. </br>
 You can read more about [Kubernetes Service Accounts](https://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/).
 
+Let's deploy a service account 
 
+```
+kubectl -n shopping apply -f serviceaccount.yaml
 
 ```
+Now we can deploy a pod that uses the service account 
+```
+kubectl -n shopping apply -f pod.yaml
+```
+Now we can test the access from within that pod by trying to list pods:
+
+```
+kubectl -n shopping exec -it shopping-api -- bash
+
 # Point to the internal API server hostname
 APISERVER=https://kubernetes.default.svc
 
@@ -183,4 +196,15 @@ CACERT=${SERVICEACCOUNT}/ca.crt
 
 # List pods through the API
 curl --cacert ${CACERT} --header "Authorization: Bearer $TOKEN" -s ${APISERVER}/api/v1/namespaces/shopping/pods/ 
-```
\ No newline at end of file
+
+# we should see an error not having access
+```
+
+Now we can allow this pod to list pods in the shopping namespace
+```
+kubectl -n shopping apply -f serviceaccount-role.yaml
+kubectl -n shopping apply -f serviceaccount-rolebinding.yaml
+```
+
+If we try run `curl` command again we can see now we are able to get a json 
+response with pod information
diff --git a/kubernetes/rbac/pod.yaml b/kubernetes/rbac/pod.yaml
index 1b7d69e8b..9f4f9639b 100644
--- a/kubernetes/rbac/pod.yaml
+++ b/kubernetes/rbac/pod.yaml
@@ -1,9 +1,9 @@
 apiVersion: v1
 kind: Pod
 metadata:
-  name: nginx
+  name: shopping-api
 spec:
   containers:
   - image: nginx
-    name: nginx
+    name: shopping-api
   serviceAccountName: shopping-api
diff --git a/kubernetes/rbac/role.yaml b/kubernetes/rbac/role.yaml
index b42e20f2b..d5facf272 100644
--- a/kubernetes/rbac/role.yaml
+++ b/kubernetes/rbac/role.yaml
@@ -2,11 +2,11 @@ apiVersion: rbac.authorization.k8s.io/v1
 kind: Role
 metadata:
   namespace: shopping
-  name: pod-reader
+  name: manage-pods
 rules:
 - apiGroups: [""]
   resources: ["pods", "pods/exec"]
   verbs: ["get", "watch", "list", "create", "delete"]
-- apiGroups: [""]
+- apiGroups: ["apps"]
   resources: ["deployments"]
   verbs: ["get", "watch", "list", "delete", "create"]
\ No newline at end of file
diff --git a/kubernetes/rbac/rolebinding.yaml b/kubernetes/rbac/rolebinding.yaml
index 5ecf3b34e..de2b323e4 100644
--- a/kubernetes/rbac/rolebinding.yaml
+++ b/kubernetes/rbac/rolebinding.yaml
@@ -1,7 +1,7 @@
 apiVersion: rbac.authorization.k8s.io/v1
 kind: RoleBinding
 metadata:
-  name: read-pods
+  name: manage-pods
   namespace: shopping
 subjects:
 - kind: User
@@ -9,5 +9,5 @@ subjects:
   apiGroup: rbac.authorization.k8s.io
 roleRef:
   kind: Role
-  name: pod-reader
+  name: manage-pods
   apiGroup: rbac.authorization.k8s.io
\ No newline at end of file