[jira] [Created] (KAFKA-7392) Allow to specify subnet for Docker containers using standard CIDR notation

["Attila Sasvari (JIRA)" <ji...@apache.org>]

Attila Sasvari created KAFKA-7392:
-------------------------------------

             Summary: Allow to specify subnet for Docker containers using standard CIDR notation
                 Key: KAFKA-7392
                 URL: https://issues.apache.org/jira/browse/KAFKA-7392
             Project: Kafka
          Issue Type: Improvement
          Components: system tests
            Reporter: Attila Sasvari


During Kafka system test execution, the IP range of the Docker subnet, 'ducknet' is allocated by Docker.
{code}
docker network inspect ducknet
[
    {
        "Name": "ducknet",
        "Id": "f4325c524feee777817b9cc57b91634e20de96127409c1906c2c156bfeb4beeb",
        "Created": "2018-09-09T11:53:40.4332613Z",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": {},
            "Config": [
                {
                    "Subnet": "172.23.0.0/16",
                    "Gateway": "172.23.0.1"
                }
            ]
        },
{code}

The default bridge (docker0) can be controlled [externally|https://success.docker.com/article/how-do-i-configure-the-default-bridge-docker0-network-for-docker-engine-to-a-different-subnet] through etc/docker/daemon.json, however, subnet created by ducknet is not. It might be a problem as many businesses make extensive use of the [RFC1918|https://tools.ietf.org/html/rfc1918] private address space (such as 172.16.0.0/12 : 172.16.0.0 - 172.31.255.255) for internal networks (e.g. VPN).

h4. Proposed changes:
- Introduce a new subnet argument that can be used by {{ducker-ak up}} to specify IP range using standard CIDR, extend help message with the following:
{code}
    If --subnet is specified, default Docker subnet is overriden by given IP address and netmask,
    using standard CIDR notation. For example: 192.168.1.5/24.
{code}





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