I’m new to Docker, and it’s unclear how to access an external database from a container. Is the best way to hard-code in the connection string? # Dockerfile ENV DATABASE_URL amazon:rds/connection?string 16 s 16 You can pass environment variables to your containers with the -e flag. An example from a startup script: sudo docker run … Read more
When using Docker, we start with a base image. We boot it up, create changes and those changes are saved in layers forming another image. So eventually I have an image for my PostgreSQL instance and an image for my web application, changes to which keep on being persisted. What is a container? 3Best Answer … Read more
I have build a Docker image from a Docker file using the below command. $ docker build -t u12_core -f u12_core . When I am trying to rebuild it with the same command, it’s using the build cache like: Step 1 : FROM ubuntu:12.04 —> eb965dfb09d2 Step 2 : MAINTAINER Pavan Gupta <[email protected]> —> Using … Read more
This question is related to Should I be concerned about excess, non-running, Docker containers?. I’m wondering how to remove old containers. The docker rm 3e552code34a lets you remove a single one, but I have lots already. docker rm –help doesn’t give a selection option (like all, or by image name). Maybe there is a directory … Read more
I’m getting started working with Docker. I’m using the WordPress base image and docker-compose. I’m trying to ssh into one of the containers to inspect the files/directories that were created during the initial build. I tried to run docker-compose run containername ls -la, but that didn’t do anything. Even if it did, I’d rather have … Read more
Is there a command I can run to get the container’s IP address right from the host after a new container is created? Basically, once Docker creates the container, I want to roll my own code deployment and container configuration scripts. 5 53
How do I transfer a Docker image from one machine to another one without using a repository, no matter private or public? I create my own image in VirtualBox, and when it is finished I try to deploy to other machines to have real usage. Since it is based on my own based image (like … Read more
I am trying to build a backup and restore solution for the Docker containers that we work with. I have Docker base image that I have created, ubuntu:base, and do not want have to rebuild it each time with a Docker file to add files to it. I want to create a script that runs … Read more
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 4 years ago. Improve this question I use Ubuntu for development and deployment and have a need for creating an isolated … Read more
In Dockerfiles there are two commands that look similar to me: CMD and ENTRYPOINT. But I guess that there is a (subtle?) difference between them – otherwise it would not make any sense to have two commands for the very same thing. The documentation states for CMD The main purpose of a CMD is to … Read more
