there is no ip address in the lo network

[lisongmin]

there is no ip address(127.0.0.1/8) in the lo network, so app can not listen on 127.0.0.1

root@bypass-route:/# ip addr
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
3: eth0@if7: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default 
    link/ether 2e:f4:d0:00:17:83 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 172.26.64.2/20 brd 172.26.79.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::2cf4:d0ff:fe00:1783/64 scope link 
       valid_lft forever preferred_lft forever

when change to docker driver, the lo network is fine.

root@9b68f72d354e:/# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
3: eth0@if118: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default 
    link/ether 32:2c:db:6a:dc:f0 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 172.26.64.107/20 brd 172.26.79.255 scope global eth0
       valid_lft forever preferred_lft forever

the job file:

job "test2" {
  datacenters = ["dc1"]

  group "test2" {

    network {
      mode = "bridge"
    }

    task "test2" {
      driver = "containerd-driver"
      config {
        image           = "docker.io/library/ubuntu:20.04"
        command         = "sleep"
        args            = ["600s"]
      }

      resources {
        cpu    = 500
        memory = 256
      }
    }
  }
}

Is there any suggestion here?

thanks.

[shishir-a412ed]

@lisongmin hashicorp/nomad is probably a better place for this issue.

When you set

    network {
      mode = "bridge"
    }

nomad sets up the bridge by relying on the CNI bridge plugin. containerd-driver just joins the network namespace set up by nomad.
I think hashicorp/nomad would be a good place to start the discussion. Can you open the issue there?