I'd like to be able to run a container with the -P parameter while having it bind to the internal 10.10.0.0/22 subnet.
By default once do something like this:
docker run -d -P --name=nginx nginx
It will look something like this:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
dbb556c99c81 nginx "/usr/sbin/nginx" 2 minutes ago Up 2 minutes 0.0.0.0:32773->80/tcp nginx
Exposing it on 0.0.0.0/0 Is there a way to make this my internal IP?
You can manually bind to a specific interface when selecting individual ports with -p, e.g.:
$ docker run -d -p 127.0.0.1:8080:80/tcp --name test-nginx nginx
2e07ebc61bcdc82a187a27eabca10211a4c9ac09d66e516e5c176d7282cffe2b
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2e07ebc61bcd nginx "nginx -g 'daemon off" 5 seconds ago Up 2 seconds 443/tcp, 127.0.0.1:8080->80/tcp test-nginx
With -P, it uses the interface configured on the daemon (dockerd or docker daemon). By default that is 0.0.0.0, but you can change it to any other IP:
$ dockerd --help
# ...
--ip=0.0.0.0 Default IP when binding container ports
Note that 0.0.0.0 is listening on all interfaces, so the only reason to specify a specific IP is to lock down the container further, not to open it up for your environment.
Related
I am learning Docker as a beginner and I am finding one info confusing. Here is step details:
Pulling Image from Docker Hub
Running Image
Now, I am seeing any Half port details in CLI due to which I am not able to ger proper port ID.
But when I am running same Image through KITEMATIC and checking the status of the running container then it is showing me properly.
Please refer Screenshot below for details:
First Line in shared Pic is showing complete details of PORTs( started container in KITEMATIC)
Second-line is not showing complete.
I want to know the reason for this difference and how to resolve it.
In first line of docker ps, you publish the port using below command
docker run -it -p 32773:80 -p 32772:443 static-site
That is why you are seeing HOST_PORT->Container_PORT, to see the same response on another container you need to publish port
docker run -it --rm -p 80:80 -p 443:443 your_image
80:80 mean HostPort:ContainerPort.
Images can expose a port. This is documentation from the image creator to those using the image. It tells you which ports the application inside the container are listening on by default. When you run a container with an exposed port, but you do not publish it on the host, you'll see only the container port listed in the docker container ls. This is again only documentation at this point, no docker networking has been configured to use that container port, so docker is letting you know that inside the container that application is likely listening on that port:
$ docker run -d --name unpublished --rm nginx
63291688813a75a8d9f0d383b4fbef30e93be8e89bd22fc80c2953da65d1d5e9
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
63291688813a nginx "nginx -g 'daemon of…" 41 seconds ago Up 39 seconds 80/tcp unpublished
If you publish a container to a specific port, you'll see that listed as desired:
$ docker run -d --name exact -p 8080:80 --rm nginx
10f82a87d8dce2226c030ca5f23e7983b0f60673c0ec614302dc129dad4ba86d
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
10f82a87d8dc nginx "nginx -g 'daemon of…" 14 seconds ago Up 12 seconds 0.0.0.0:8080->80/tcp exact
And it looks like kitematic is publishing all ports with the -P flag (capital) which looks at all exposed ports and maps them to unused high numbered ports:
$ docker run -d --name publish_all -P --rm nginx
982afb237756e543820810cbd6366c8fa8569a386ff581cd7edc63557004e8c4
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
982afb237756 nginx "nginx -g 'daemon of…" 3 seconds ago Up 2 seconds 0.0.0.0:32768->80/tcp publish_all
If you want the know what port was published on the host, particularly when you tell docker to use unused high numbered ports, you can query that with the port command, e.g. for the publish_all container above:
$ docker container port publish_all 80
0.0.0.0:32768
You can see the exposed ports with an inspect of the image:
$ docker image inspect nginx --format '{{json .Config.ExposedPorts}}' | jq .
{
"80/tcp": {}
}
I try to connect to my container on localhost/127.0.0.1/0.0.0.0 but site can’t be reached.
Details:
$ docker run -d -p 80:80 nginx:alpine
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS
NAMES
d5b465ed1b18 nginx:alpine "nginx -g 'daemon of" 6 minutes ago Up 6 minutes 0.0.0.
0:80->80/tcp quizzical_swirles
798b40ceec77 10.36.7.241:5000/facileexplorer:0.3.8 "/usr/bin/supervisor" 9 minutes ago Up 9 minutes 4444/t
cp, 0.0.0.0:3838->3838/tcp, 0.0.0.0:8787->8787/tcp, 5900/tcp vigilant_banach
I followed this tutotial: https://blog.sixeyed.com/published-ports-on-windows-containers-dont-do-loopback/:
$ docker inspect --format '{{ .NetworkSettings.Networks.nat.IPAddress }}' d5b465ed1b18
<no value>
but it doesn't return port.
And I also helped myself with this guide: https://www.iancollington.com/docker-and-cisco-anyconnect-vpn/ because some of my docker images are on private registry, so I did following steps:
PATH=$PATH:"C:\Program Files\Oracle\VirtualBox"; export PATH
export DOCKER_HOST="tcp://127.0.0.1:2376"
docker-machine stop default
VBoxManage modifyvm "default" --natpf1 "docker,tcp,,2376,,2376"
docker-machine start default
alias docker='docker --tlsverify=false'
Could you help?
When you are using Docker Toolbox, running docker run -p 80:80 can be misleading. It means it will forward the port 80 of your container to the port 80 of your Docker machine, not the Windows host!
If you want to access the container through your Windows host, you also need to forward port 80 of your Docker machine to that host.
I see you are using VirtualBox, which allows you to do that by adding an entry in Settings > Network > Advanced > Port Forwarding.
Example tutorial with images: https://www.howtogeek.com/122641/how-to-forward-ports-to-a-virtual-machine-and-use-it-as-a-server/
I have a docker container which is running with port mapping.
cce2ca6eb83b nginx "nginx -g 'daemon off" 5 seconds ago Up 3 seconds 0.0.0.0:80->80/tcp www-nginx
Now I want to change host port from 80 to 8080. How can I do that?
docker update
does not have any option to change the network settings.
You can't edit the port mapping for running container. docker update command is used to prevent containers from consuming too many resources from their Docker host and also to dynamically set restart policy but not port mapping.
A work around for what you want to achieve could be to create a new image from your current container and then start a new container from the newly created image with the port 8080 as follow:
docker stop www-nginx
docker commit www-nginx www-nginx-2
docker run -p 8080:80 -td www-nginx-2
You can't edit the port mapping on a container, you will have to create a new container.
I want to expose a docker container port on a different host port.
docker run -d --net="host" --name="couchpotato2" -p 5555:5050 ...
However, I don't get the mapping of 5555 -> 5050. Any idea why?
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
114ae1617632 needo/couchpotato "/sbin/my_init" 3 seconds ago Up 2 seconds couchpotato3
Here is the docker image I'm using:
https://github.com/needo37/couchpotato
Your problem is the use of host networking:
--net="host"
Explained in the documentation
Publishing ports and linking to other containers will not work when
--net is anything other than the default (bridge).
What is the different between the following commands when creating a container in docker?
docker run -d -p 8080 sample/image
and
docker run -d -p 8080:8080 sample/image
I have seen majority of them use the second command, but I am not sure if they mean different things, or if the first is shorthand.
I couldn't find any material on this.
docker run -d -p 8080 sample/image
Exposes port 8080 of the container as an arbitrary port on the host. Which port that is is up to Docker.
Whereas,
docker run -d -p 8080:8080 sample/image
Exposes port 8080 of the container as port 8080 on the host.
In both cases, you can see the mapping using docker inspect, or even docker ps:
380af8c2bcc6 ubuntu "bash" 15 seconds ago Up 13 seconds 0.0.0.0:32768->1234/tcp elegant_meitner
In this case, port 1234 of the container is exposed as port 32768 on the host.