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Kubernetes Deployment Based on Manifests

Prerequisites

  • Local or cloud (EKS, GKE, AKE, etc) cluster running any version of Kubernetes

  • Application defined in plain Kubernetes manifest files

  • Pod exposed to the public Internet or other potential sources of malicious web and API attacks

  • Kubernetes ingress controller or external load balancer (like AWS ELB or ALB) to add the HTTP request header X-Forwarded-For, which contains the real public IP address of the connecting client

  • Wallarm account in the EU cloud or US cloud

  • Username and password of the user with the Deploy role added to your Wallarm account. To add a new user, please follow these instructions

Installation

  1. Create Wallarm ConfigMap.

  2. Update the definition of the Deployment object in Kubernetes.

  3. Update the definition of the Service object in Kubernetes.

  4. Deploy the manifest to the Kubernetes cluster.

  5. Test the Wallarm sidecar container.

Step 1: Creating Wallarm ConfigMap

  1. Create a new manifest file or add a new object to the existing manifest for a new Kubernetes ConfigMap object that will hold the NGINX configuration file for the Wallarm sidecar container:
apiVersion: v1
kind: ConfigMap
metadata:
  name: wallarm-sidecar-nginx-conf
data:
  default: |
    geo $remote_addr $wallarm_mode_real {
      # Please replace <WALLARM_MODE> below by the request filtering mode: 
      # off to disable request processing
      # monitoring to process but not block requests
      # block to process all requests and block the malicious ones
      default <WALLARM_MODE>;
      # IP addresses and rules for US cloud scanners
      50.116.11.251 off;45.79.143.18 off;172.104.21.210 off;74.207.237.202 off;45.79.186.159 off;45.79.216.187 off;45.33.16.32 off;96.126.127.23 off;172.104.208.113 off;192.81.135.28 off;104.237.155.105 off;45.56.71.221 off;45.79.194.128 off;104.237.151.202 off;45.33.15.249 off;45.33.43.225 off;45.79.10.15 off;45.33.79.18 off;45.79.75.59 off;23.239.30.236 off;172.104.22.150 off;45.33.86.254 off;45.56.72.191 off;45.79.75.91 off;192.155.92.134 off;23.239.4.41 off;45.79.93.164 off;45.56.122.184 off;96.126.124.141 off;45.79.115.178 off;34.94.100.64 off;35.235.101.133 off;34.94.16.235 off;35.236.51.79 off;35.236.55.214 off;35.236.127.211 off;35.236.126.84 off;35.236.3.158 off;34.94.218.5 off;35.236.118.146 off;35.236.1.4 off;35.236.20.89 off;
      # IP addresses and rules for European cloud scanners
      139.162.148.184 off;139.162.151.155 off;139.162.159.244 off;139.162.151.10 off;139.162.159.137 off;39.162.157.131 off;139.162.144.202 off;139.162.130.66 off;139.162.158.79 off;139.162.156.102 off;85.90.246.120 off;172.104.128.215 off;139.162.174.26 off;139.162.182.20 off;139.162.190.22 off;139.162.168.17 off;139.162.167.19 off;139.162.170.84 off;139.162.191.89 off;139.162.176.169 off;139.162.184.225 off;139.162.185.243 off;172.104.143.34 off;139.162.178.148 off;139.162.186.136 off;139.162.163.61 off;139.162.171.141 off;139.162.179.214 off;139.162.187.138 off;139.162.164.41 off;139.162.172.35 off;139.162.180.37 off;139.162.188.246 off;172.104.139.18 off;172.104.152.28 off;139.162.177.83 off;172.104.240.115 off;172.105.64.135 off;139.162.153.16 off;172.104.241.162 off;139.162.167.48 off;172.104.233.100 off;172.104.157.26 off;172.105.65.182 off;172.104.138.5 off;172.104.150.243 off;139.162.190.165 off;139.162.166.202 off;139.162.174.220 off;139.162.182.156 off;139.162.190.86 off;139.162.167.51 off;139.162.175.71 off;172.104.152.54 off;172.104.151.59 off;172.104.128.67 off;172.104.152.96 off;139.162.145.238 off;172.104.128.103 off;172.104.139.37 off;139.162.184.33 off;139.162.186.129 off;172.104.154.128 off;172.104.146.90 off;172.104.128.44 off;85.90.246.49 off;139.162.146.245 off;139.162.171.208 off;172.104.252.112 off;139.162.132.87 off;139.162.162.71 off;172.104.229.59 off;172.104.152.244 off;172.104.250.27 off;139.162.130.123 off; 178.32.42.221 off;46.105.75.84 off;51.254.85.145 off;188.165.30.182 off;188.165.136.41 off;188.165.137.10 off;54.36.135.252 off;54.36.135.253 off;54.36.135.254 off;54.36.135.255 off;54.36.131.128 off;54.36.131.129 off;
    }
    server {
        listen 80 default_server;
        listen [::]:80 default_server ipv6only=on;
        server_name localhost;
        root /usr/share/nginx/html;
        index index.html index.htm;
        wallarm_mode $wallarm_mode_real;
        # wallarm_instance 1;
        set_real_ip_from 0.0.0.0/0;
        real_ip_header X-Forwarded-For;
        location / {
                # Please replace <APP_CONTAINER_PORT> below by the port number
                # on which the container accepts incoming requests,
                # the value must be identical to ports.containerPort
                # in definition of your main app container
                proxy_pass http://localhost:<APP_CONTAINER_PORT>;
                include proxy_params;
        }
    }
  1. Update parameter values following the code comments.

Step 2: Updating the Deployment Object in Kubernetes

  1. Go to the Kubernetes manifests and open the template that defines the Deployment object for the application. A complex application can have several Deployment objects for different components of the application - please find an object which defines pods which are actually exposed to the Internet. For example:
apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp
spec:
  selector:
    matchLabels:
      app: myapp
  template:
    metadata:
      labels:
        app: myapp
    spec:
      containers: 
      # Definition of your main app container
      - name: myapp 
        image: <Image>
        resources:
          limits:
            memory: "128Mi"
            cpu: "500m"
        ports:
        # Port on which the application container accepts incoming requests
        - containerPort: 8080 
  1. Copy the following elements to the template:
    • the wallarm sidecar container definition to the spec.template.spec.containers section,
    • the wallarm-nginx-conf volume definition to the spec.template.spec.volumes section.
    An example of the template with added elements is provided below. Elements for copying are indicated by the Wallarm element comment.
apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp
spec:
  selector:
    matchLabels:
      app: myapp
  template:
    metadata:
      labels:
        app: myapp
    spec:
      containers:
      # Wallarm element: definition of Wallarm sidecar container
      - name: wallarm
        image: wallarm/node:2.14
        imagePullPolicy: Always
        env:
        # Wallarm API endpoint: 
        # "api.wallarm.com" for the EU cloud
        # "us1.api.wallarm.com" for the US cloud
        - name: WALLARM_API_HOST
          value: "api.wallarm.com"
        # Username of the user with the Deploy role
        - name: DEPLOY_USER
          value: "username"
        # Password of the user with the Deploy role
        - name: DEPLOY_PASSWORD
          value: "password"
        - name: DEPLOY_FORCE
          value: "true"
        - name: WALLARM_ACL_ENABLE
          value: "true"
        # Amount of memory in GB for request analytics data, 
        # recommended value is 75% of the total server memory
        - name: TARANTOOL_MEMORY_GB
          value: 2
        ports:
        - name: http
          # Port on which the Wallarm sidecar container accepts requests 
          # from the Service object
          containerPort: 80
        volumeMounts:   
        - mountPath: /etc/nginx/sites-enabled   
          readOnly: true    
          name: wallarm-nginx-conf
      # Definition of your main app container
      - name: myapp
        image: <Image>
        resources:
          limits:
            memory: "128Mi"
            cpu: "500m"
        ports:
        # Port on which the application container accepts incoming requests
        - containerPort: 8080
      volumes:
      # Wallarm element: definition of the wallarm-nginx-conf volume
      - name: wallarm-nginx-conf
        configMap:
          name: wallarm-sidecar-nginx-conf
          items:
            - key: default
              path: default

Step 3: Updating the Service Object in Kubernetes

  1. Return to the Kubernetes manifests and open the template that defines the Service object that points to Deployment modified in the previous step. For example:
apiVersion: v1
kind: Service
metadata:
  name: myapp
spec:
  selector:
    app: myapp
  ports:
  - port: {{ .Values.service.port }}
    # Wallarm sidecar container port; 
    # the value must be identical to ports.containerPort
    # in definition of Wallarm sidecar container
    targetPort: 8080
  1. Make sure the ports.targetPort value is identical to ports.containerPort value that was defined in the Wallarm sidecar container.

Step 4: Deploying the Manifest to the Kubernetes Cluster

Update or deploy the new application manifest in the Kubernetes cluster.

NetworkPolicy Object in Kubernetes

If the application also uses the NetworkPolicy object it should be updated to reflect the Wallarm sidecar container port specified above.

Step 5: Testing the Wallarm Sidecar Container

  1. Get the list of pods using the following command:

    kubectl get pods
    

    The number of containers in the pod should increase, and the status of the pod should be "Running".

    NAME                       READY   STATUS    RESTARTS   AGE
    mychart-856f957bbd-cr4kt   2/2     Running   0          3m48s
    
  2. Go to your Wallarm account > Nodes via the link below and make sure that a new node is displayed. This created node is used to filter requests to your application.

  3. Send a malicious test attack request to the application as described in these instructions.

  4. Go to your Wallarm account > Events via the link below and make sure that an attack is displayed in the list: