Kubernetes-RBAC
Role-based access control (RBAC) is a method of regulating access to computer or network resources based on the roles of individual users within your organization.
LAB
kubectl create ns finance
openssl genrsa -out john.key 2048 # it will create a private key
openssl req -new -key john.key -out john.csr -subj “/CN=john/O=javadeveloper”
openssl x509 -req -in john.csr -CA /etc/kubernetes/pki/ca.crt -CAkey /etc/kubernetes/pki/ca.key -CAcreateserial -out john.crt -days 500
#role.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
namespace: finance
name: deployment-manager
rules:
– apiGroups: [“”,”extensions”,”apps”]
#
# at the HTTP level, the name of the resource for accessing ConfigMap
# objects is “configmaps”
resources: [“deployments”,”replicasets”,”pods”]
verbs: [“get”, “list”, “watch”, “create”, “update”, “patch”, “delete”]
kubectl create -f role.yaml
apiVersion: rbac.authorization.k8s.io/v1
# This role binding allows “jane” to read pods in the “default” namespace.
# You need to already have a Role named “pod-reader” in that namespace.
kind: RoleBinding
metadata:
name: deployment-manager-binding
namespace: finance
subjects:
# You can specify more than one “subject”
– kind: User
name: john
apiGroup: “”
roleRef:
# “roleRef” specifies the binding to a Role / ClusterRole
kind: Role #this must be Role or ClusterRole
name: deployment-manager # this must match the name of the Role or ClusterRole you wish to bind to
apiGroup: “”
kubectl create -f rolebinding.yaml
kubectl config set-credentials john –client-certificate=/home/ubuntu/temp/john.crt –client-key=/home/ubuntu/temp/john.key
kubectl config set-context developer-context –cluster=kubernetes –namespace=finance –user=john
kubectl config use-context developer-context
kubectl config delete-context kubernetes-admin@kubernetes
—-Install client
curl -LO https://storage.googleapis.com/kubernetes-release/release/`curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt`/bin/linux/amd64/kubectl
chmod +x ./kubectl
sudo mv ./kubectl /usr/local/bin/kubectl
kubectl version –client
Considering that you are logged in as a root user and kubectl installed, then you need to have $HOME/.kube directory if it does not exist then create that directory.
ls ./$HOME/.kube
Copy the config file under.kube directory
kubectl config view
kubectl get pods -n finance
kubectl run nginx-pod –image=nginx -n finance
kubectl get pods -n finance
