I’m following step one of this docker tutorial. I have installed ubuntu version 14.04 on a virtual box vm. I intentionally downgraded by docker version so that when I type “docker version” I get Client version: 1.5.0. This is because the server I intend to communicate with is on 1.5.0. When trying the command “docker run hello-world” I get the
Tag: docker
Commit data in a mysql container
I created a mysql container using the officially supported mysql image. I ran the image mounting a folder that contains a sql dump, then I created a new database in the container and imported the .sql dump in it: Then I listed the running containers to get that container’s id: Then, I commited the container (with the imported sql) as
Why does “/usr/bin/env bash -x” only work in command line?
I am playing with a docker CentOS image, and find executing “/usr/bin/env bash -x” command is OK in terminal: But after writing this command into a script and execute it, it doesn’t work, and prompts “No such file or directory”: Is there any difference between two methods? Answer The short answer is that you only get one parameter to the
Docker cgroup.procs no space left on device
After some problem with Docker and my dedicated server with a Debian (the provider give some OS image without some features needed by Docker, so I recompiled Linux kernel yesterday and activate the features needed, I followed some instruction in blog). Now I was happy to have success with docker I tried to create image… and I have an error.
How to port forward in Docker container?
I’d like to forward 8080 port to 80 with iptables in a Docker container. In the build I have an error message as you can see below. Here is the Dockerfile: Here is the output: Thank you in advance for any help you can provide. Answer First, running an iptables command during the docker build process would never make sense;
Fail to start linux container after upgrading to docker 1.5
I used to use docker 1.3 and it worked well. There’re some problems after upgrading to docker 1.5. Is there something about my lxc? And I have tried apt-get purge lxc and apt-get install lxc to re-install it. And lxc seems work well to start. Answer Try switching from lxc to native exec drivers in docker. You can do this
Difference between environment in Dockerfile RUN and interactive shell on a running container?
I’m starting with a Docker image that has OracleXE installed on it. This image has a running instance, with everything configured. I can fire up that image, and, either from an interactive shell container, or by ssh’ing into the container, I can easily execute sqlplus. To create a container with my desire additions, such as a new oracle user and
How does Docker share resources
I’ve been looking into Docker and I understand from this post that running multiple docker containers is meant to be fast because they share kernel level resources through the “LXC Host,” however, I haven’t found any documentation about how this relationship works that is specific to the docker configuration, and at what level are resources shared. What’s the involvement of
How to send signal to program run in a docker container?
I have a program run in a docker container with detached mode. So how to send a signal such as SIGINT to this program? Answer You can use nsenter to get into your container space and send your signal. More info : http://jpetazzo.github.io/2014/06/23/docker-ssh-considered-evil/
How to perform memory dump to docker container from outside
I’m trying to find a way to perform a memory dump on a docker container in order to perform memory forensics (to detect malware exploits for example). I would like to be able to perform the same methods I use on a virtual machine. The problem is that docker containers (and any kind of linux containers) use memory in a