I can run the following command to make a container using another container's network namespace:
docker run -it --net=container:<container_name> ubuntu:14.04
After running it, the two container have the same IP address. I want to know how to use the docker remote api or other client api to do it.
My docker server&client version is 1.10.3
docker run is basically docker create followed by docker start. You can find the documentation for the /containers/create endpoint in the API reference.
The property you're looking for is the NetworkMode in the HostConfig;
NetworkMode - Sets the networking mode for the container. Supported standard values are: bridge, host, none, and container:<name|id>. Any other value is taken as a custom network’s name to which this container should connect to.
Related
i'm new of docker's world. I'm trying to import two Dockers model downloaded from peltarion on Ubuntu version 20.04.
I download docker, setup the two images and create the first container with command
docker run -p 8000:8000 model-export
when i call xxx.xx.xx.xx:8000 with http request i receive answer by it.
My problem is that when i create the second container
docker run -p 8090:8090 model-export
I get the following configuration on the port
enter image description here
At this point i try to call with xxx.xx.xx.xx:8090, but no response.
How can i configure the container so i can call it with http request?
Thanks in advance to anyone who helps me
TLDR: your parameter values should be -p 8090:8000.
The order of -p/--publish parameter values should be:
published_port:container_exposed_port
published_port is a port used by host (your machine), where Docker is installed. And that can be used outside like a public-available service. For example it can be visible by other computers in your local network, or by Internet.
container_exposed_port is a port that is exposed from Docker container to Docker host by image (for example by EXPOSE 8000 instruction in image Dockerfile). It's visible only for your Docker host, or for other Docker containers (Docker networking) too.
I have a container for which I expose my port to access a service running within the container. I am not exposing my ports outside the container i.e. to the host (using host network on mac). On getting inside the container using exec -t and running a curl for a post request, I get the error:
curl command: curl http://localhost:19999
Failed connect to localhost:19999; Connection refused.
I have the expose command in my dockerfile and do not want to expose ports to my host. My service is also up and running inside the container. I also have the property within config set as
"ExposedPorts": {"19999/tcp": {}}
(obtained through `docker inspect <container id/name>\ Any idea on why this is not working? Using docker for Mac
I'd post my docker-compose file too but this is being built through maven. I can ensure that I am exposing my port using 19999:19999. Another weird issue is that on disabling my proxies it would run a very light weight command for my custom service and wouldn't run it again returning the same error as above. The issue only occurs on my machine and not others
Hints:
The app must be listening on port 19999 which is probably not.
The EXPOSE that you're using inside the Dockerfile does nothing.
Usually there is no need to change the default port on which an application is listening, hence each container has its own IP and you shouldn't run in a port conflict.
Answer:
Instead of curling 19999 try to use the default port on which your app would normally be listening to(it's hard to guess what you are trying to run).
If you don't publish a port (with the docker run -p option or the Docker Compose ports: option), you cannot directly reach the container on Docker for Mac. See the Known limitations, use cases, and workarounds in the Docker Desktop for Mac documentation: the "per-container IP addressing is not possible" item ism what you're trying to attempt.
The docker inspect IP address is basically useless, except in one very specific Docker configuration (on a native-Linux host, calling from outside of Docker, on the same host); I wouldn't bother looking it up.
The Dockerfile EXPOSE directive and similar runtime options do very little and mostly serve as documentation. Even if you have that configured you still need to separately publish the port when you start the container to reach it from outside of Docker space.
we have two machine…one is windows machine and another in Linux machine. My application is running under Docker Container at Linux machine. our data base is running at Windows machine.our application need to get data from windows machine DB.
As we have given proper data source detail like IP, username ,password in our application. it works when we do not use docker container but when we use docker container it do not work.
Can anyone help me out to get this solution that how we can connect outside DB from Docker enabled application as we are totally new guys in term of Docker.
Any help would be much appreciated.
Container's default network is "bridge",you should choose macvlan or host network.
method 1
docker run -d --net host image
this container will share your host IP address and will be able to access your database.
method 2
Use docker network create command to create a macvlan network,refrence here
then create your container by
docker run -d --net YOURNETWORK image
The container will have an IP address which is the same gateway with its host.
There are a lot of issues that could be affecting your container's ability to communicate with your database. In the future you should compose your question with as much detail as possible. To correctly answer this you will, at a minimum, need to include the following details:
Linux distribution name & version
Docker version
Output of docker inspect from the container
Linux firewall configuration
Network configuration
Is your Windows machine running on the same local network / subnet as your Linux machine? If so, please provide information about the subnet, as the default bridge set up by Docker may restrict access to local resources, whereas those over a wide area network would still be accessible.
You can try passing the --network=host option to your docker run command like so: docker run --network=host <image name>. Doing so eliminates the need to specify port mappings in your run command, as they are ignored when using the host's network.
Please edit your question and include the above requested details to get a complete answer.
I'm trying to access Docker remote API from within a container because I need to start other containers.
The host address is 172.19.0.1, so I'm using http://172.19.0.1:2375/images/json to get the list of images (from host, http://localhost:2375/images/json works as expected.
The connection is refused, I guess because Docker (for Windows) listens on 127.0.0.1 and not on 0.0.0.0.
I've tried to change configuration (both from UI and daemon.json) adding the entry:
"hosts": ["tcp://0.0.0.0:2375"]
but the daemon fails to start. How can I access the api?
You can set DOCKER_OPTS in windows as below and try. In Windows, Docker runs inside a VM. So, you have to ssh into the VM and make the changes.
DOCKER_OPTS='-H tcp://0.0.0.0:4243 -H unix:///var/run/docker.sock'
Check if it works for you.
Update :- To ssh into the VM (assuming default is the VM name you have created using Docker toolbox), enter the following command in the Docker Quickstart Terminal,
docker-machine ssh default
You can find more details here.
You could link the host's /var/run/docker.sock within the container where you need it. This way, you don't expose the Docker Remote API via an open port.
Be aware that it does provide root-like access to docker.
-v /var/run/docker.sock:/var/run/docker.sock
You should use "tcp://host.docker.internal:2375" to connect to host machine from container. Please make sure that you can ping the "host.docker.internal" address
https://github.com/docker/for-win/issues/1976
I have some containers that communicate via their IP from the network docker.
I can use the option -h or --hostname when running a new container but I want to set the hostname for existing container.
Is it possible?
One way is to create network and add different container in this network.
When adding container in the network, you can use the --alias option of docker network. Like this:
Create a network:
docker network create <my-network-name>
Add containers in the network:
docker network connect --alias <hostname-container-1> <my-network-name> <container-1>
docker network connect --alias <hostname-container-2> <my-network-name> <container-2>
docker network connect --alias <hostname-container-3> <my-network-name> <container-3>
Enjoy.
So each container can see other container by the alias (the alias is used as hostname).
Generally, you would need to stop/restart a container, in order to run it again with -h (--hostname) (unless you used --net=host)
If you cannot stop the container, you can try and (in an attached bash session) edit its /etc/hostname.
The hostname is immutable once the container is created (although technically you can modify /etc/hostname).
As suggested in another answer, you cannot change the hostname by stopping or restarting the container. There are not Docker engine client parameters for the start command that affect hostname. That wouldn't make sense anyway as starting a container simply launches the ENTRYPOINT process in a container filesystem that has already been created (i.e. /etc/hostname has already been written).
It is possible to synchronize the container hostname with the host by using the --uts=host parameter when the container is created. This shares the UTS namespace. I would not recommend --net=host unless you also want to share the host network devices (i.e. bypass the Docker bridge).