Create a Docker Network.md

Problem Statement

The Nautilus DevOps team needs to establish several Docker environments for different applications. One specific task involves setting up a Docker network on App Server 3 in the Stratos Datacenter. The network should be named ecommerce and configured with specific settings. The requirements are:

• Create a Docker network named ecommerce on App Server 3.
• Configure the network to use the macvlan driver.
• Set the network to use the subnet 172.28.0.0/24 and IP range 172.28.0.0/24.

Solution

Follow these steps to create and configure the Docker network as specified:

1. Create the Docker Network

   Use the docker network create command to establish a new network with the name ecommerce. Configure it to use the macvlan driver, and specify the desired subnet and IP range.

   docker network create ecommerce -d macvlan --subnet=172.28.0.0/24 --ip-range=172.28.0.0/24

   In this command:

   • ecommerce is the name of the network.
   • -d macvlan specifies the use of the macvlan driver.
   • --subnet=172.28.0.0/24 sets the network's subnet.
   • --ip-range=172.28.0.0/24 defines the IP address range within the subnet.

2. Verify the Network Configuration

   To confirm that the network has been created and configured correctly, use the docker network inspect command. This command provides detailed information about the ecommerce network.

   docker network inspect ecommerce

   Expected output:

   [
       {
           "Name": "ecommerce",
           "Id": "394923b894e14c1705164b0b8a203d3fc47f5f6457168a7edcd668a705006659",
           "Created": "2024-07-10T13:11:58.623314771Z",
           "Scope": "local",
           "Driver": "macvlan",
           "EnableIPv6": false,
           "IPAM": {
               "Driver": "default",
               "Options": {},
               "Config": [
                   {
                       "Subnet": "172.28.0.0/24",
                       "IPRange": "172.28.0.0/24"
                   }
               ]
           },
           "Internal": false,
           "Attachable": false,
           "Ingress": false,
           "ConfigFrom": {
               "Network": ""
           },
           "ConfigOnly": false,
           "Containers": {},
           "Options": {},
           "Labels": {}
       }
   ]

   This output confirms that the ecommerce network has been created with the correct settings:

   • The network driver is macvlan.
   • The subnet and IP range are correctly configured.