Docker i have no name

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Ask Different is a question and answer site for power users of Apple hardware and software. It only takes a minute to sign up. I suppose there are two problems here, one is that my hostname is undefined, the other is that whoami reports my name as a number.

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Something in memory got corrupted, and the mapping between your userID and your username ipd was lost. I've seen it happen usually when I've manually killed hung system processesalthough I'm not sure exactly what causes it. Because that mapping is lost, whoami can't convert your ID into a username so returns the ID, and your prompt defaults to the "I have no name!

I see it's an old thread, but here is the solution to this problem without restarting the whole computer. The problem is in the opendirectoryd daemon and the earliest reports date from the beginning of Restarting the daemon switching users with an admin one via Fast User Switching fixes the problem. While writing this answer, I've found a similar question in the Serverfault herewhich also covers my answer.

This happens to me randomly when I resume from standby i. A log out or reboot is the only way for me to fix it. As I type it is happening right now.

As the comment in the original post asked, I ran id -p and it crashed. An interesting error appears though:. I had this same baffling problem today Lion Sign up to join this community.

The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 8 years ago.

How to Name or Rename Docker Containers

Active 3 years, 4 months ago. Viewed 48k times. Suddenly, this morning, I open a Terminal window and I get this: I have no name! I am a human being! Anyone know what I need to do to get my name back? Cajunluke BTW -- for those interested, i logged out command-shift-Q and after logging back in and restarting terminal, the problem is gone! Still interested in what may have caused this, if for no other reason than to advance the state of my McKnowledge.

I am asking why, suddenly, my bash prompt displays "I have no name! Perhaps its just a coincidence that whoami is also reporting my number rather than my name. What do hostname and id -p return? Good suggestion though, if it happens again i'll check them both! Active Oldest Votes. Logging out and back in might fixit, but restarting is the best way as you discovered. Basically, it's a symptom of another problem, and not a problem in and of itself. Bobson Bobson 1 1 gold badge 7 7 silver badges 17 17 bronze badges.

I wish I could explain just how that mapping gets lost, but I've never dug deep enough to figure it out. This just happened to me again.

docker i have no name

I had killed launchdand I was nowwhich prevented me from using sudo.Hopefully, you will never really need to be reading this article, and you only happen to be here because you are bored or did a wrong kind of search. Or you might actually be facing an issue where your Docker containers do not have Internet access anymore, even though they used to work well, just recently, and you've made no changes to your environment.

This sounds like a very vague problem statement, but this is what I was facing all of a sudden. My containers did not have network access, with the error like Temporary failure resolving URL.

It looked like an issue with name resolutionand it bugged me extra, because it was not supposed to happen. But we're getting ahead of ourselves. Test host: Ubuntu with systemd - important for latter.

Let's proceed slowly. You have configured Docker on your system. It's working well. You have multiple images, multiple containers, and you even used advanced network rulesand everything seems to be in perfect order. Then, you notice that you can no longer do certain activities in your containers, like updates or package installations.

The best way to debug this is to attach a shell to a running container instance, as I've explained in the intro guide. Indeed, inside a running container, you see something like:. This looks like a DNS problem name resolution. The container is unable to figure out how to resolve domain names to IP addresses, and therefore it cannot connect to the servers to grab data, like updates.

docker i have no name

There are two issues here. One, why did the problem come to bear all of a sudden? Two, we need to actually fix the network. Now, I'd like to show you how to troubleshoot this in an elegant way.

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First, let's understand why the issue occurred. There's no immediate answer here, but some things to look at may include more than just your immediate environment. For example, your host may not have changed, but the network could have - routers, network policies, DNS servers themselves. Since you cannot normally control what's happening outside your immediate setup, the best way to figure out where the issue resides is by doing a step-by-step isolation of the problem.

If all these checks return no strange problems or errors, the next step is to focus on DNS resolution. This is true both for physical instances of Linux as well as virtual machines and containers. You will probably notice that the container uses something like:. See man:systemd-resolved. Now, try that in your container. Edit the resolv. If that solves your issue, great. But most likely, it won't. But then, at this point, you have no problem with network connectivity on your host.

And this is further complicated by the fact most modern Linux distributions use systemd.When Docker containers are created, the system automatically assign a universally unique identifier UUID number to each container to avoid any naming conflicts and improve automation without human involvement.

In this article, we will explain how to easily identify Docker containers and name or rename containers in Linux.

Note that if no name is specified, by default, the the Docker daemon assigns containers a UUID long identifier; it generates a random string as a name. You can assign memorable names to your docker containers when you run them, using the --name flag as follows.

The -d flag tells docker to run a container in detached mode, in the background and print the new container ID. In this article, we have expalined how to name and rename Docker containers. Use the comment form below to ask any questions or to add your thoughts to this guide. TecMint is the fastest growing and most trusted community site for any kind of Linux Articles, Guides and Books on the web. Millions of people visit TecMint! If you like what you are reading, please consider buying us a coffee or 2 as a token of appreciation.

We are thankful for your never ending support. Tags: Docker Tips. View all Posts.

docker i have no name

Aaron Kili is a Linux and F. S enthusiast, an upcoming Linux SysAdmin, web developer, and currently a content creator for TecMint who loves working with computers and strongly believes in sharing knowledge. Your name can also be listed here. Got a tip? Submit it here to become an TecMint author. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.

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Become an author. These are essential to avoid naming conflicts and promote automation without human intervention. They effectively identify containers to the host and network. However, they take more effort for humans to differentiate between, whether in the 64 character human-readable long display or the more frequently displayed 12 character short form, which might look something like c9f0f9d3d.

To help the humans, Docker also supplies containers with a randomly-generated name from two words, joined by an underscore, e. Here are three tips that can make it easier to keep your bearings as you learn to work with containers.

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There are limitations, however. Since container names must be unique, you cannot use deliberate naming and scale a service beyond one container.

For example, if we ran a container based on the nginx base image and started it like this:. While the name appears in the output of docker ps and can be used to manage the container, it will not appear in the command prompt of the container if you attach to it or in log files.

Consequently, it appears in command prompt. It plays a role in configuring container DNS and can be helpful while in the learning stages of a multi-container setup. In this case, you can use the --rm flag to automatically delete it when it exits. This can make it easier to keep things clean. Be careful, though! You can learn more about containers and working with the docker run command in the Working with Docker Containers guide. Docker is a great tool for automating the deployment of Linux applications inside software containers, but to take full advantage of its potential each component of an application should run in its own individual container.

For complex applications Discourse is an open-source discussion platform. It can be used as a mailing list, a discussion forum, or a long-form chat room.

In this tutorial, we'll install Discourse in an isolated environment using Docker, a containerization application.

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Interested in Node. This tutorial will walk you through the first step: building an image for a Node.

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We will also walk you through pushing that image to Docker Hub and using the saved image to recreate your application container.

Docker Compose makes it easier for users to orchestrate the processes of Docker containers, including starting up, shutting down, and setting up intra-container linking and volumes. In this tutorial, you'll install the latest version of Docker Compose to help you manage multi-container applications on a Debian 10 server. Twitter Facebook Hacker News. DigitalOcean home.This article will try to address questions like:.

For the purpose of this article we will be using a Fedora image as an example. The Docker daemon is running on my laptop, and I am going to pull a fedora image from docker hub.

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Each docker image is composed of layers, with these layers having a parent-child hierarchical relationship with each other. Docker calls it the graph database. When I did docker pull fedorathe image was downloaded one layer at a time. Docker calls this an intermediate image hence the flag -a. Next it downloaded the layer ded7cd95e and named it fedora:latest. The fedora:latest image is composed of both these layers, forming a parent child hierarchical relationship as shown below.

Just to double check that we got the parent-child relationship right, we can check the JSON file of the layer ded7cd95e All right! So we got that right. They stand for intermediate images and can be seen using docker images -a. In programming languages like Java or Golang a dangling block of memory is a block that is not referenced by any piece of code.

The garbage collection system of those languages periodically marks the dangling blocks and return it back to the heap, so that these memory blocks are available for future allocations.

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Similarly a dangling file system layer in Docker is something that is unused and is not being referenced by any images. Hence we need a mechanism for Docker to clear these dangling images. Those are the intermediate images as described above. But where do they come from? These dangling images are produced as a result of docker build or pull command. To give a more concrete example. I got my new Fedora image. This is a dangling image and needs to be pruned.

That would definitely be a nice feature to have.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm currently using a Jenkins instance inside a docker container. This image happens to use Tini as PID 1.

When I try open a shell into it with:. This is keeping me from using shell born ssh commands from Jenkins jobs that runs inside this container:.

I could circle around that using ssh related plugins. Also tried other names like yesihaveaname and yesihaveagroup instead of jenkins. I've been in contact with Tini's developer and he does not believe the cause for this problem is Tini as it does not mess around uid or gid, any other leads would be apreciated.

Learn more. Asked 3 years, 10 months ago. Active 11 days ago. Viewed 2k times. Posted also in here: github. Active Oldest Votes. Like your posted link says, the UserID inside the container maybe has no name allocated. Although I do not use Tini I solved this problem as following: 1. Sign up or log in Sign up using Google.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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. Hey there, this feels more like a question then a bug. I'm currently using a Jenkins instance inside a docker container. This image happens to use Tini as PID 1. When I try open a shell into it with:. This is keeping me from using shell born ssh commands from Jenkins jobs that run in this container:.

I could circle around that using ssh related plugins. Hi there rcbop. What image are you using for Jenkins? The official one, or a hand-rolled one? If the latter, can you share your Dockerfile? Either way, can you share how it was started? I doubt this is due to Tini itself, considering it doesn't do anything UID-related, but I'm happy to look into it a little bit. Hey there krallin!

My dockerfile for that container is currently something like this:. I'm assuming you might be using jenkins If not, it's going to be a little hard for me to try and repro. Using jenkins I suspect this issue might be related to the base image you're using perhaps it's outdated?

Hey krallin. No particular reason, except I guess, my lack of understanding of how Tini works.

docker i have no name

I'm gonna try studying the code. I have moved this to a stackoverflow question in the hope of reaching more people. Could you perhaps try with another one of their tags and let me know which one you chose and whether it works? That way at least we'll be working off of the same base image. Hey krallin. So Tini is not the cause of that. So I'm closing this issue. Thanks for all the support. I have had this same issue but in a Docker container running on Kubernetes.

I removed the security context section from the deployment and the respective user declared.


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