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Questions tagged [docker]

Docker is an open source project that automates the deployment of applications inside software containers.

Docker is an open source project that automates the deployment of applications inside software containers. Docker extends a common container format called Linux Containers (LXC), with a high-level API providing a lightweight virtualization solution that runs processes in isolation. Docker utilizes LXC, cgroups, and the Linux kernel itself. Unlike traditional virtual machines, a Docker container does not include a separate operating system, instead it relies on the operating system’s functionality provided by the underlying infrastructure.

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Docker: failed to add the pair interfaces (operation not supported)

After installing Docker, I am getting an error when I try to run the Hello World example: Error response from daemon: Cannot start container 4145d0fccd96b904e4ab4413735f1129b8765429bad5be71dc8d5f4c0760666d: failed to create endpoint high_saha on…
piero-la-lune
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How to install Docker on AWS EC2 instance with AMI (CE/EE Update)

What is the current way of installing Docker on an AWS EC2 instance running the AMI? There has been an announcement of Docker Enterprise Edition and now I want to know if anything has changed. Until now, I have been using yum install docker and do…
mxscho
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How is Docker Compose version 2 "volumes" syntax supposed to look?

With Docker Compose v1.6.0+, there now is a new/version 2 file syntax for the docker-compose.yml file. The changes include a separate top level key named volumes. This allows to "centralize" volume definitions in one place. What I am trying to do is…
kaiser
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docker-compose: option to automaticaly remove container after run in docker-compose.yml

The docker-compose run reference states that it has the --rm option to Remove container after run. I want to make this a default run behavior for some of services I specify in docker-compose.yml. So, the questions are: Can it somehow be…
Ivan Kolmychek
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Steps for limiting outside connections to docker container with iptables?

My goal is to limit access to docker containers to just a few public IP addresses. Is there a simple, repeatable process to accomplish my goal? Understanding only the basics of iptables while using Docker's default options, I'm finding it very…
GGGforce
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Check is container/service running with docker-compose

I am using the docker-compose. Some commands like up -d service_name or start service_name are returning right away and this is pretty useful if you don't want the containers running to depend on the state of the shell, like they do with regular up…
Ivan Kolmychek
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Docker pull: TLS handshake timeout

I get this consistenly (Ubuntu 16.04 LTS): $ docker pull nginx Using default tag: latest Error response from daemon: Get https://registry-1.docker.io/v2/: net/http: TLS handshake timeout However curl TLS works fine (apart from the auth error): $…
Willem
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How to set system time dynamically in a Docker container

Is there any way to set a Docker containers system time dynamically (at run time) without effecting the host machine? Using hwclock --set --date "Sat Aug 17 08:31:24 PDT 2016" gives the following error: hwclock: Cannot access the Hardware Clock…
Vingtoft
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"No command specified" from re-imported docker image/container

I am trying to take a docker container from one machine and run it on another and encountering this error: "Error response from daemon: No command specified". Below is a simplified example showing the problem: docker --version Docker version 1.10.1,…
Greendrake
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Writing Apache2 Logs to stdout/stderr?

I'm running Apache2 in a docker container, and want to write nothing to the disk, writing logs to stdout and stderr. I've seen a few different ways to do this (Supervisord and stdout/stderr, Apache access log to stdout) but these seem like hacks.…
aronchick
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How do you restart all Tasks of a Service?

We have a task that loads some configuration files from an external data source. After the settings are uploaded we would like to be able to restart all the tasks in a service so that the settings propagate to all instances. What's the best way to…
Dennkster
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Update the container of a service in Amazon ECS

What kind of approach is recommended for updating the container of a service which is running in Amazon ECS? The AWS documentation says: "If you have updated the Docker image of your application, you can create a new task definition with that image…
Petrus Repo
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What is the point of the docker-proxy process? Why is a userspace tcp proxy needed?

I have noticed that there is docker-proxy process running for each published port. What is the purpose of this process? Why is a user space tcp proxy needed for this? $ ps -Af | grep proxy root 4776 1987 0 01:25 ? 00:00:00 docker-proxy…
Tarnay Kálmán
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What does "the input device is not a TTY" exactly mean in "docker run" output?

This is a command that works: $ echo 'hi there' | docker run -i ubuntu cat hi there This is a command that responds with an error message: $ echo 'hi there' | docker run -it ubuntu cat the input device is not a TTY I would like to figure out…
Mikhail Vasin
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Mount Docker container contents in host file system

I want to be able to inspect the contents of a Docker container (read-only). An elegant way of doing this would be to mount the container's contents in a directory. I'm talking about mounting the contents of a container on the host, not about…
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