This may get closed as opinion based, but for what it’s worth my opinion is that docker should be involved in networking up to the transport layer (TCP/UDP) but no higher (HTTP). Thus I would say no you should not install nginx as a reverse proxy directly on your docker host directly and yes you … Read more
When I need to inspect a docker container that I’ve created that is having issues running the normal CMD in the Dockerfile, I comment out that command and replace with “sleep” command to just pause the container when it starts so I can log into it and inspect the installation. In Dockerfile CMD [“sleep”,”3600″] To … Read more
You can run docker logs <container_name> to retrieve the logs (if you don’t know what was the container name, you can run docker ps -a to display all the containers)
Currently, I don’t think docker provides this level of granularity. It doesn’t specify how many cores it allocates in its lxc.conf files, so you will get all cores for each docker, potentially (or possibly 1, I’m not 100% sure on that). However, you could tweak the conf file generated for a given container and set … Read more
Text from https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/7-Beta/html/Resource_Management_and_Linux_Containers_Guide/sec-Linux_Containers_Compared_to_KVM_Virtualization.html Copyright © 2014 Red Hat, Inc.: Linux Containers Compared to KVM Virtualization The main difference between the KVM virtualization and Linux Containers is that virtual machines require a separate kernel instance to run on, while containers can be deployed from the host operating system. This significantly reduces the complexity of container creation … Read more
You can use volumes in order to do this. You have two options: Docker managed volumes: docker run -v /src/path nodejsapp docker run -i -t -volumes-from <container id> bash The file you edit in the second container will update the first one. Host directory volume: docker run -v `pwd`/host/src/path:/container/src/path nodejsapp The changes you make on … Read more
Check this post: http://www.yegor256.com/2014/08/29/docker-non-root.html In rultor.com we run all builds in their own Docker containers. And every time before running the scripts inside the container, we switch to a non-root user. This is how: adduser –disabled-password –gecos ” r adduser r sudo echo ‘%sudo ALL=(ALL) NOPASSWD:ALL’ >> /etc/sudoers su -m r -c /home/r/script.sh r is … Read more
Firstly you need to install a SSH server in the images you wish to ssh-into. You can use a base image for all your container with the ssh server installed. Then you only have to run each container mapping the ssh port (default 22) to one to the host’s ports (Remote Server in your image), … Read more
To see the file size of your containers, you can use the –size argument of docker ps: docker ps –size
From the Docker FAQ: Docker is not a replacement for lxc. “lxc” refers to capabilities of the linux kernel (specifically namespaces and control groups) which allow sandboxing processes from one another, and controlling their resource allocations. On top of this low-level foundation of kernel features, Docker offers a high-level tool with several powerful functionalities: Portable … Read more