Commits on Jun 16, 2021

1. docker: generate /etc/hosts file for bridge network mode …

   When `network.mode = "bridge"`, we create a pause container in Docker with no
   networking so that we have a process to hold the network namespace we create
   in Nomad. The default `/etc/hosts` file of that pause container is then used
   for all the Docker tasks that share that network namespace. Some applications
   rely on this file being populated.
   
   This changeset generates a `/etc/hosts` file and bind-mounts it to the
   container when Nomad owns the network, so that the container's hostname has an
   IP in the file as expected. The hosts file will include the entries added by
   the Docker driver's `extra_hosts` field.
   
   In this changeset, only the Docker task driver will take advantage of this
   option, as the `exec`/`java` drivers currently copy the host's `/etc/hosts`
   file and this can't be changed without breaking backwards compatibility. But
   the fields are available in the task driver protobuf for community task
   drivers to use if they'd like.

   

   tgross committed Jun 16, 2021
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