Commit graph

12 commits

Author SHA1 Message Date
James Rasell 0e926ef3fd
allow configuration of Docker hostnames in bridge mode (#11173)
Add a new hostname string parameter to the network block which
allows operators to specify the hostname of the network namespace.
Changing this causes a destructive update to the allocation and it
is omitted if empty from API responses. This parameter also supports
interpolation.

In order to have a hostname passed as a configuration param when
creating an allocation network, the CreateNetwork func of the
DriverNetworkManager interface needs to be updated. In order to
minimize the disruption of future changes, rather than add another
string func arg, the function now accepts a request struct along with
the allocID param. The struct has the hostname as a field.

The in-tree implementations of DriverNetworkManager.CreateNetwork
have been modified to account for the function signature change.
In updating for the change, the enhancement of adding hostnames to
network namespaces has also been added to the Docker driver, whilst
the default Linux manager does not current implement it.
2021-09-16 08:13:09 +02:00
Tim Gross 7bd61bbf43
docker: generate /etc/hosts file for bridge network mode (#10766)
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.
2021-06-16 14:55:22 -04:00
Nick Ethier d45be0b5a6
client: add NetworkStatus to Allocation (#8657) 2020-10-12 13:43:04 -04:00
Tim Gross d965a15490 driver/networking: don't recreate existing network namespaces 2019-09-25 14:58:17 -04:00
Nick Ethier e440ba80f1
ar: refactor network bridge config to use go-cni lib (#6255)
* ar: refactor network bridge config to use go-cni lib

* ar: use eth as the iface prefix for bridged network namespaces

* vendor: update containerd/go-cni package

* ar: update network hook to use TODO contexts when calling configurator

* unnecessary conversion
2019-09-04 16:33:25 -04:00
Nick Ethier ef83f0831b
ar: plumb client config for networking into the network hook 2019-07-31 01:04:06 -04:00
Nick Ethier af66a35924
networking: Add new bridge networking mode implementation 2019-07-31 01:04:06 -04:00
Nick Ethier 63c5504d56
ar: fix lint errors 2019-07-31 01:03:19 -04:00
Nick Ethier e312201d18
ar: rearrange network hook to support building on windows 2019-07-31 01:03:19 -04:00
Nick Ethier ef1795b344
ar: add tests for network hook 2019-07-31 01:03:18 -04:00
Nick Ethier 220cba3e7e
ar: move linux specific code to it's own file and add tests 2019-07-31 01:03:18 -04:00
Nick Ethier 66c514a388
Add network lifecycle management
Adds a new Prerun and Postrun hooks to manage set up of network namespaces
on linux. Work still needs to be done to make the code platform agnostic and
support Docker style network initalization.
2019-07-31 01:03:17 -04:00