Kubernetes¶

How to deploy Kubernetes¶

Overview¶

CIS can be configured in multiple ways depending on the customer scenario. CIS can be deployed on Kubernetes and OpenShift platform. CIS installation may differ based on the resources (for example: ConfigMap, Ingress, Routes, and CRD) used by the customer to expose the Kubernetes services. CIS installation also depends on BIG-IP deployment (stand alone and HAproxy configuration) and Kubernetes cluster networking (Flannel/Calico).

Prerequisites¶

Installing CIS Manually¶

Add BIG-IP credentials as K8S secrets.

kubectl create secret generic bigip-login -n kube-system --from-literal=username=admin --from-literal=password=<password>

Create a service account for deploying CIS. In the example below, the Service Account is named bigip-ctlr.
```
kubectl create serviceaccount bigip-ctlr -n kube-system
```

Create a Cluster Role and Cluster Role Binding on the Kubernetes Cluster using the examples below.

kubectl apply -f  k8s_rbac.yaml

The example below shows the broadest supported permission set. You can narrow the permissions down to specific resources, namespaces, etc. to suit your needs. See the Kubernetes RBAC documentation for more information.

k8s_rbac.yaml¶

 # for use in k8s clusters only
 kind: ClusterRole
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
   name: bigip-ctlr-clusterrole
 rules:
 - apiGroups: ["", "extensions"]
   resources: ["nodes", "services", "endpoints", "namespaces", "ingresses", "pods"]
   verbs: ["get", "list", "watch"]
 - apiGroups: ["", "extensions"]
   resources: ["configmaps", "events", "ingresses/status"]
   verbs: ["get", "list", "watch", "update", "create", "patch"]
 - apiGroups: ["", "extensions"]
   resources: ["secrets"]
   resourceNames: ["<secret-containing-bigip-login>"]
   verbs: ["get", "list", "watch"]
 - apiGroups: ["cis.f5.com"]
   resources: ["virtualservers", "tlsprofiles", "transportservers"]
   verbs: ["get", "list", "watch", "update"]

 ---

 kind: ClusterRoleBinding
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
   name: bigip-ctlr-clusterrole-binding
   namespace: kube-system
 roleRef:
   apiGroup: rbac.authorization.k8s.io
   kind: ClusterRole
   name: bigip-ctlr-clusterrole
 subjects:
 - apiGroup: ""
   kind: ServiceAccount
   name: bigip-ctlr
   namespace: kube-system

Create a CIS deployment using cis_deploy.yaml as shown below:

kubectl apply -f  cis_deploy.yaml

cis_deploy.yaml¶

apiVersion: apps/v1
kind: Deployment
metadata:
  name: k8s-bigip-ctlr-deployment
  namespace: kube-system
spec:
# DO NOT INCREASE REPLICA COUNT
  replicas: 1
  selector:
    matchLabels:
      app: k8s-bigip-ctlr-deployment
  template:
    metadata:
      labels:
        app: k8s-bigip-ctlr-deployment
    spec:
      # Name of the Service Account bound to a Cluster Role with the required
      # permissions
      containers:
        - name: k8s-bigip-ctlr
          image: "f5networks/k8s-bigip-ctlr"
          env:
            - name: BIGIP_USERNAME
              valueFrom:
                secretKeyRef:
                # Replace with the name of the Secret containing your login
                # credentials
                  name: bigip-login
                  key: username
            - name: BIGIP_PASSWORD
              valueFrom:
                secretKeyRef:
                # Replace with the name of the Secret containing your login
                # credentials
                  name: bigip-login
                  key: password
          command: ["/app/bin/k8s-bigip-ctlr"]
          args: [
            # See the k8s-bigip-ctlr documentation for information about
            # all config options
            # https://clouddocs.f5.com/containers/latest/
            "--bigip-username=$(BIGIP_USERNAME)",
            "--bigip-password=$(BIGIP_PASSWORD)",
            "--bigip-url=<ip_address-or-hostname>",
            "--bigip-partition=<name_of_partition>",
            "--pool-member-type=nodeport",
            "--insecure",
            # for secure communication provide the internal ca certificates using config-map with below option and remove insecure parameter
            #"--trusted-certs-cfgmap=<namespace/configmap>",
            ]
      serviceAccount: bigip-ctlr
      serviceAccountName: bigip-ctlr
    imagePullSecrets:
        # Secret that gives access to a private docker registry
        #- name: f5-docker-images
        # Secret containing the BIG-IP system login credentials
        - name: bigip-login

Creating VXLAN Tunnels on Kubernetes Cluster¶

Log in to BIG-IP and create a VXLAN tunnel profile. Create a partition using the command below. In this example, the partition is named ‘kubernetes’.
```
tmsh create auth partition kubernetes
```

Create a VXLAN tunnel.

tmsh create net tunnels tunnel k8s-tunnel { app-service none key 1 local-address 10.1.1.4 profile k8s-vxlan }

Create the VXLAN tunnel self-IP.

tmsh create net self k8s-vxlan-selfip { address 10.244.20.1/16 vlan k8s-tunnel allow-service all }

Save the configuration.
```
tmsh save sys config
```
Before deploying CIS in ClusterIP mode, you need to configure BIG-IP as a node in the Kubernetes cluster. To do so you will need to modify bigip-node.yaml with the MAC address auto-created from the previous steps. From the jumpbox terminal, run the following command at bigip1. Copy the displayed MAC Address.
```
tmsh show net tunnels tunnel k8s-tunnel all-properties
```

Update the MAC address obtained in the previous step to following yaml file:

bigip-node.yaml¶

apiVersion: v1
kind: Node
metadata:
  name: bigip1
  annotations:
    #Replace IP with Self-IP for your deployment
    flannel.alpha.coreos.com/public-ip: "10.1.1.4"
    #Replace MAC with your BIG-IP Flannel VXLAN Tunnel MAC
    flannel.alpha.coreos.com/backend-data: '{"VtepMAC":"2c:c2:60:23:0c:58"}'
    flannel.alpha.coreos.com/backend-type: "vxlan"
    flannel.alpha.coreos.com/kube-subnet-manager: "true"
spec:
  #Replace Subnet with your BIG-IP Flannel Subnet
  podCIDR: "10.244.20.0/24"

Create the BIG-IP node:
```
kubectl create -f bigip-node.yaml
```
Verify “bigip1” node is created:
```
kubectl get nodes
```

Examples Repository¶

View more examples on GitHub.

Note

To provide feedback on Container Ingress Services or this documentation, you can file a GitHub Issue.

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