Mac kubernetes – create two container pod with shared volume

This tutorial will cover steps to create a pod with nginx container and ubuntu containers with shared volume. Both containers will have the same IP and we can get shell on both of these.

1. Create config file multi-pod.yml
   

   apiVersion: v1
   kind: Pod
   metadata:
     name: multi-pod
   spec:
   
     restartPolicy: Never
   
     volumes:
     - name: shared-data
       emptyDir: {}
   
     containers:
   
     - name: nginx-container
       image: nginx
       volumeMounts:
       - name: shared-data
         mountPath: /usr/share/nginx/html
   
     - name: ubuntu-container
       image: ubuntu
       volumeMounts:
       - name: shared-data
         mountPath: /pod-data
       command: ["/bin/sh"]
       args: ["-c", "echo Hello, World!!! > /pod-data/index.html && sleep 3600"]

   
   We need to add the sleep command to ensure container does not finish running.
2. Create the pod
   kubectl apply -f multi-pod.yml
3. Get a shell to the nginx container
   kubectl exec -it multi-pod -c nginx-container -- /bin/bash
4. Install ifconfig and curl
   apt-get update -y
   apt-get install -y net-tools
   apt-get install -y curl
5. Run ifconfig
   

   eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
           inet 10.1.0.45  netmask 255.255.0.0  broadcast 10.1.255.255
           ether 4a:16:6c:5f:36:86  txqueuelen 0  (Ethernet)
           RX packets 24703  bytes 36774193 (35.0 MiB)
           RX errors 0  dropped 0  overruns 0  frame 0
           TX packets 13083  bytes 717718 (700.8 KiB)
           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
   
   lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
           inet 127.0.0.1  netmask 255.0.0.0
           loop  txqueuelen 1000  (Local Loopback)
           RX packets 24  bytes 1930 (1.8 KiB)
           RX errors 0  dropped 0  overruns 0  frame 0
           TX packets 24  bytes 1930 (1.8 KiB)
           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

6. Run curl
   curl localhost
   or
   curl 10.1.0.45
   You should see:
   Hello, World!!!
7. Get a shell to the ubuntu container
   kubectl exec -it multi-pod -c ubuntu-container -- /bin/bash
8. Repeat above steps to install curl and ifconfig. Notice that the IP address is same as above container and curl works on localhost in same way.