10.01.2021 By Malataxe

Dockerfile change hostname

Is there way to set hostname during docker build phase now? Said I want to install a license server that is binded with hostname, do I have to use those weired, auto generated, serial numbers and letters as my hostname? Or, I just need to give up insalling license server with Dockerfile. Think about it: Would it make sense to have only one static hostname that all running instances of the application would share? Then every running instance of your service would think its hostname was foobar instead of being unique.

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You can specify --hostname flag to docker run to set the hostname for the container at runtime. Hey there, Thanks for reply. But for a license server, I will probably not want to have more than one instance running. In this case, in order to make my license keys to match my hostname, I will need to have my hostname set in build phase.

I ended up just installing everything in a running docker, with a base image using docker run -h flag, and then commit it. It would be must easier if I can set hostname in build phase just for this kind of scenario though. I just wondering if there is a workaround. Why is your license server bound to a specific hostname?

dockerfile change hostname

That seems like an odd design choice. Is it your own app or a third party one? I am not familiar with license server. I am just a hobbyist, and this is kind of experiment I did in my spare time. It came to me while I was chatting with our IT the possibility to install license server on docker, since some software license server crash a lot, and it will be super fast to just restart docker.

Is there a solution to this? I am trying to figure out how to set up my Dockerfile to change the hostname. The following did not work:. The software I am installing needs to be pre-configured inside the container upon build, and inherits the current hostname in its configuration and then tries to resolve it. So the desired hostname needs to be both specified and active upon build.

Specifying the hostname at runtime creates a lot of complexity since the container needs to configure itself on the fly when started instead of being pre-configured, and will not work without the correct hostname being passed.

I found a solution You just need to set the hostname and run the command that is dependant on the hostname in the same RUN command, since the hostname is reset for each layer. Customizing hostname during docker build phase? General Discussions.Server Fault is a question and answer site for system and network administrators. It only takes a minute to sign up. I'm having trouble setting the hostname on a running docker container.

I'm also having trouble understanding how to specify hostname after the image is started. But I forgot to specify hostname through -h ; how can I specify the hostname now that the container is running? Otherwise, you can spin up the container with -h option. Basic idea is to use docker inspect to obtain the pid of the container, then enter the uts namespace of the container via nsenter. Running hostname inside that namespace will change the hostname for the docker instance that shares that namespace.

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As a few others have pointed out, this can be changed for containers by modifying the config. The steps MUST be done in this order. This has been confirmed working for me on Docker v Sign up to join this community. The best answers are voted up and rise to the top. How to specify hostname for the running container?

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Ask Question. Asked 6 years, 9 months ago. Active 1 year, 4 months ago. Viewed k times. Improve this question. Miguel Ping Miguel Ping 1 1 gold badge 5 5 silver badges 9 9 bronze badges. Can you just stop the container and start it again supplying a hostname? AFAIK that only works when you run an image, not when you start a container.

Sometimes all you want is to see the bash command prompt with a proper name. If that is the case, you can edit the PS1 value in. Look at askubuntu. Related: How to handle specific hostname like -h option in Dockerfile.

Add a comment. Active Oldest Votes.Join Stack Overflow to learn, share knowledge, and build your career. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Is --hostname like a domain name system in docker container environment that can replace --ip when referring to other container? The --hostname flag only changes the hostname inside your container.

This may be needed if your application expects a specific value for the hostname. It does not change DNS outside of docker, nor does it change the networking isolation, so it will not allow others to connect to the container with that name.

You can use the container name or the container's short, 12 character id to connect from container to container with docker's embedded dns as long as you have both containers on the same network and that network is not the default bridge.

The following command will create a docker container with base image as ubuntu Please see: Difference between --link and --alias in overlay docker network? Learn more. When to use --hostname in docker?

Ask Question. Asked 3 years, 10 months ago. Active 10 months ago. Viewed 73k times. Improve this question. Add a comment. Active Oldest Votes. Improve this answer. BMitch BMitch k 25 25 gold badges silver badges bronze badges.

The implication was that the users outside of the container would not be able to resolve the hostname just by setting that value on the container. Inside of docker networking, there's a different DNS. But the statement was also wrong at least with current versions of docker, the hostname is not added as a network alias, only the container id and the container name resolve with the internal docker DNS.

I had the same problem installing an Arcgis server in a container. It would work the first time after build, but commiting and running a second time I couldn't reach it. After setting a fixed host the server is reachable. Pang 8, gold badges 74 74 silver badges bronze badges.

Ehud Lev Ehud Lev 1, 16 16 silver badges 24 24 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook.

How To Edit Hosts File in Windows 10

Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.Join Stack Overflow to learn, share knowledge, and build your career. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I want to install some software which requires resolvable hostname as non-loopback address.

If I run a docker image with -h option like. But I cannot use same way if I create an image from Dockerfile. I tested creating an image using following Dockerfile. Depending on the software, you might be able to do some kind of work-around. For example, you could try something like. By setting the hostname within the same RUN command as you install the software, it'll happen inside the same layer of the container. Docker will later overwrite the hostname and you'll have to set it anew when running, but your software might be OK with that.

If you have to do a lot of this, you might try Packer for building containers. It can build Docker containers, but doesn't use multiple layers. This makes it slower to rebuild, faster to download the built images, and makes it more convenient to do multiple operations on an image before freezing it into a container. As for workaround, you can use docker-compose or docker stack to build your container with specific hostnamee.

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I think the following is better because docker containers usually don't have 'hostname' installed, therefore I would use the head command:. Learn more. How to handle specific hostname like -h option in Dockerfile Ask Question. Asked 5 years, 11 months ago. Active 9 months ago. Viewed 34k times.

I'm using CentOS 7 as docker daemon host and centos:6 Docker images. Sending build context to Docker daemon 2. Improve this question. Add a comment. Active Oldest Votes. This isn't generally possible in a Dockerfile. Improve this answer.

dockerfile change hostname

Nathaniel Waisbrot Nathaniel Waisbrot Your suggestion is truly a work-around what I wanted. Also I'll consider to use Packer after Dockerfile trial. Then run as: docker-compose --build up or using Docker stacks : docker stack deploy -c docker-compose.

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I'm learning docker 1. I wanted to change the hostname of the container after I create them. I tried to edit the following file, and the hostname gets overwritten. How do you name a docker container? I am not sure if you mean you want to set the hostname of a new container or of a running container. You say you want to do it after creating the container, but then you also say you're "starting the image".

If you haven't start ed the image you haven't yet created the container -- a container is what you get when you start an image. This is more difficult. The hostname command won't work. To change the hostname of a running container, you can use the "nsenter" command.

You will have to be root on the host, though.

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The ones with pid are my docker container. The namespace type that handles hostnames is "uts", so let's run hostname in that namespace:. Sign up to join this community. The best answers are voted up and rise to the top. How do I change docker host name after the image creation?

Ask Question. Asked 5 years, 5 months ago.

Active 4 months ago.Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. The situation: I would like to use docker for testing Salt states which include a hostname command:. Sure, it's running as root. You can try it manually:.

How to set Docker Name and Hostname

Could you please tell me why? As a temporary, I have to create a "fake" hostname command to make my states return "Succeeded".

dockerfile change hostname

The text was updated successfully, but these errors were encountered:. Once you have given a container a hostname you cant change it. I could be completely wrong though. Oh, what happened in the first half of this year? I have just started a docker container after a few months not touching and now it's worked as expected:.

In another container which has been built from this Dockerfile, the problem is back:. I'm having the same problem, docker v1. I need to be able to change the hostname from within the container because I do not have control over the way the image is started and the application has a problem with hostnames starting with a number which often happens. The ones with pid are my docker container. The namespace type that handles hostnames is "uts", so let's run hostname in that namespace:.

Of course, this still doesn't let you run "hostname foo" inside the container.The file called named. Anyone knows the problem? I had the exact same issue. You can create a host file in Yes you could use them together. When you Hi akhtar, You are getting this warning because your When you use docker-compose down, all the Hey nmentityvibes, you seem to be using To solve this problem, I followed advice Export : Export is used to persist a Docker Compose always starts and stops containers Already have an account?

Sign in. COPY in Dockerfile does not work. Thank you. Should be permission issue.

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Your comment on this answer: Your name to display optional : Email me at this address if a comment is added after mine: Email me if a comment is added after mine Privacy: Your email address will only be used for sending these notifications. RUN hostname new-server-name 2. RUN echo "

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