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TASK 71: Create a Docker Network

Requirements​

The Nautilus DevOps team needs to set up several docker environments for different applications. One of the team members has been assigned a ticket where he has been asked to create some docker networks to be used later. Complete the task based on the following ticket description:

a. Create a docker network named as blog on App Server 3 in Stratos DC.

b. Configure it to use macvlan drivers.

c. Set it to use subnet 10.10.1.0/24 and iprange 10.10.1.3/24.

Note

The Requirements section remains unchanged. The solution below uses one direct docker network create workflow and then validates the resulting network configuration.

Prerequisites​

  • You can SSH to App Server 3 and switch to a privileged shell.
  • Docker is installed and the host supports creation of macvlan networks.
  • The requested network name blog is not already in use.

Steps​

Log in to the specified App server and switch to root. For the server credentials, check out the Project Nautilus documentation.

sshpass -p  '**********' ssh -o StrictHostKeyChecking=no banner@172.16.238.12
sudo su

List the existing Docker networks.

$ docker network ls

NETWORK ID     NAME      DRIVER    SCOPE
3af8254bb380   bridge    bridge    local
0ad9e8d5d09b   host      host      local
4f1df125c801   none      null      local

Create the new network based on the requirements. Make sure to specify the correct network name, subnet, and IP range.

docker network create blog  \
--driver macvlan \
--subnet 10.10.1.0/24 \
--ip-range 10.10.1.3/24

It should return the ID of the new network.

3f801d2ac7ec5dc41e8de82a5ff520dcfd43a226e7f926caab30dfdba5328f08

We can verify this by listing the networks in the server again.

$ docker network ls

NETWORK ID     NAME        DRIVER    SCOPE
3f801d2ac7ec   blog        macvlan   local
3af8254bb380   bridge      bridge    local
0ad9e8d5d09b   host        host      local
4f1df125c801   none        null      local

We also see more details about the new network.

$ docker network inspect blog | head -15

[
    {
        "Name": "blog",
        "Id": "3f801d2ac7ec5dc41e8de82a5ff520dcfd43a226e7f926caab30dfdba5328f08",
        "Created": "2022-12-14T03:55:51.487481099Z",
        "Scope": "local",
        "Driver": "macvlan",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": {},
            "Config": [
                {
                    "Subnet": "10.10.1.0/24",
                    "IPRange": "10.10.1.3/24"

Verification​

  • Confirm the network exists with docker network ls | grep blog.
  • Confirm the driver is macvlan and the subnet and IP range match the requirement with docker network inspect blog.
  • Verify the network name is exactly blog.

Resources​