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I am trying to execute a "docker-compose up" command. Please find below my docker-compose file. I tried with network_mode: "host" but it doesn't work. I am on Linux OS. request you to let me know if I am making any blunder.
version: '3.6'
services:
mongo:
image: "mongo:latest"
container_name: ohif-mongo
ports:
- "27017:27017"
viewer:
image: ohif/viewer:latest
container_name: ohif-viewer
ports:
- "3030:80"
network_mode: "host" # please make note of the alignment
links:
- mongo
environment:
- MONGO_URL=mongodb://mongo:27017/ohif
extra_hosts:
- "pacsIP:172.xx.xxx.xxx"
volumes:
- ./dockersupport-app.json:/app/app.json
after execution, I get the below error
ERROR: for 8f4c3de7e3a3_ohif-viewer Cannot create container for service viewer: conflicting options: host type networking can't be used with links. This would result in undefined behavior
ERROR: for viewer Cannot create container for service viewer: conflicting options: host type networking can't be used with links. This would result in undefined behavior
I don't know why the error message is displayed twice. Not sure whether this is expected
Second, when I change the alignment of network_mode: "host" (by 1/2 spaces)
ports:
- "3030:80"
network_mode: "host" # please see the change in alignment now
links:
- mongo
I get the below error message
ERROR: yaml.parser.ParserError: while parsing a block mapping
in "./docker-compose.yml", line 10, column 5
expected <block end>, but found '<block mapping start>'
in "./docker-compose.yml", line 14, column 6
How can I start the container with network=host mode?
408
Docker network host, also known as Docker host networking, is a networking mode in which a Docker container shares its network namespace with the host machine. The application inside the container can be accessed using a port at the host's IP address (e.g., port 80).
Docker Engine accepts docker commands from the CLI, such as docker run <image> , docker ps to list running containers, docker image ls to list images, and so on. Docker Machine is a tool for provisioning and managing your Dockerized hosts (hosts with Docker Engine on them).
Use host networking If you use the host network mode for a container, that container’s network stack is not isolated from the Docker host (the container shares the host’s networking namespace), and the container does not get its own IP-address allocated.
If you use the docker-compose command, use network_mode instead. If you want to use a particular network on a common build, use [network] as mentioned in the second yaml file example. The syntax for using built-in networks such as host and none is a little different.
We can also use this network in Docker swarm as well by passing option ‘–network host’ to the ‘docker service create’. If we have to run a container that needs to handle a large range of ports because ‘userland-proxy’ is not created for each port.
Another way to make a host service accessible to a docker container is to listen on a unix socket, which can be mounted in the container.
network_mode: host is used for sharing the same networking space with the Host. For example you can want to access an application that is running on your Linux PC from the container.
If you want to link services together, you can use links, or depends_on, and if the services are on different hosts just create an overlay network
168
From docs:
network_mode: "host" cannot be mixed with links.
And about links
Warning: The --link flag is a legacy feature of Docker. It may eventually be removed. Unless you absolutely need to continue using it, we recommend that you use user-defined networks to facilitate communication between two containers instead of using --link. One feature that user-defined networks do not support that you can do with --link is sharing environmental variables between containers. However, you can use other mechanisms such as volumes to share environment variables between containers in a more controlled way.
Just remove the links. They are no longer required.
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