Dns settings in network stanza not usefull due incompatibility with docker task driver

[tantra35]

Nomad version

Nomad v0.12.3 (e6e969ad7e5c83d44758c982cfb756e081f779c3+CHANGES)

Issue

when dns settings using with bridge in in network stanza allocs can't start with docker driver

Recent Events:
Time                       Type            Description
2020-08-27T17:29:10+03:00  Killing         Sent interrupt. Waiting 1m0s before force killing
2020-08-27T17:29:10+03:00  Not Restarting  Error was unrecoverable
2020-08-27T17:29:09+03:00  Driver Failure  failed to create container: API error (400): conflicting options: dns and the network mode
2020-08-27T17:29:07+03:00  Driver          Downloading image
2020-08-27T17:29:07+03:00  Task Setup      Building Task Directory
2020-08-27T17:29:05+03:00  Received        Task received by client

Reproduction steps

Job file (if appropriate)

job "vault_debug-00"
{
        datacenters = ["test"]
        priority = 50

        update
        {
                stagger = "30m"
                max_parallel = 1
        }

        group test
        {
                count = 1

                network
                {
                        mode = "bridge"
                        dns {
                          servers = ["172.17.0.1"]
                        }
                }

                task "vault_debug_task_docker"
                {
                        driver = "docker"
                        kill_timeout = "1m"

                        config
                        {
                                image = "redis"
                        }

                        resources
                        {
                                memory = 200
                                cpu = 200
                        }
                }

                task "vault_debug_task_exec"
                {
                        driver = "exec"
                        kill_timeout = "1m"

                        config
                        {
                                command = "sleep"
                                args = ["600"]
                        }

                        resources
                        {
                                memory = 200
                                cpu = 200
                        }
                }
        }
}

[shoenig]

Sorry about that @tantra35 ! We should already have a fix for this in #8600 going out in the next release.

[tgross]

This issue was closed by #8600, released in 0.12.4. (Changelog entry was missing but I've added it in #9665)

[github-actions]

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