raashi_me
Host.docker.internal resolves to nothing in linux
I am trying to connect the local DB server from within a docker container and as part of it I am running the command
docker-compose run -w SERVICE [COMMAND]
I am getting an error
03:44:38.312 [error] GenServer #PID<0.259.0> terminating
(DBConnection.ConnectionError) tcp connect (host.docker.internal:5432): non-existing domain - :nxdomain
(connection) lib/connection.ex:622: Connection.enter_connect/5
(stdlib) proc_lib.erl:249: :proc_lib.init_p_do_apply/3
Last message: nil
** (Mix) The database for DubberConnect.Repo couldn't be created: killed
Can anyone help me with this?
docker version
Client: Docker Engine - Community
Version: 19.03.14
API version: 1.40
Go version: go1.13.15
Git commit: 5eb3275d40
Built: Tue Dec 1 19:20:19 2020
OS/Arch: linux/amd64
Experimental: false
Server: Docker Engine - Community
Engine:
Version: 20.10.0-rc1
API version: 1.41 (minimum version 1.12)
Go version: go1.13.15
Git commit: 131bf7e
Built: Tue Nov 17 22:50:10 2020
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.4.1
GitCommit: c623d1b36f09f8ef6536a057bd658b3aa8632828
runc:
Version: 1.0.0-rc92
GitCommit: ff819c7e9184c13b7c2607fe6c30ae19403a7aff
docker-init:
Version: 0.19.0
GitCommit: de40ad0
Operating System: Ubuntu 16.04.4 LTS
Marked As Solved
Aetherus
You can use any of the following approaches:
Using host network drive
In the docker-compose.yml.
...
services:
api:
network_mode: host
...
In the .env file,
DATABASE_URL=ecto://postgres:postgres@localhost/demo_dev
This approach makes your docker container directly use the network adapters on the host without creating subnet or NAT.
The network throughput of this approach is about 20% higher than the NAT approach, but it prevents the container to join any docker networks, and can expose ports that you don’t want to expose (for example, the epmd port 4369).
Add extra hosts to the container
In the docker-compose.yml,
...
services:
api:
extra_hosts:
- "host.docker.internal:<the IP address of the host>"
This approach is less performant and less flexible, but is more secure.
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