Questions
Find answers to frequently asked development questions. For information about Better Stack products, explore our docs.
Where Are Docker Images Stored on the Host Machine?
If you want to have a quick look at where is Docker storing your Docker images, you can use the docker info command: docker info Output: ... Storage Driver: <driver-name> Docker Root Dir: /var/li...
Should I Use Vagrant or Docker for Creating an Isolated Environment?
This depends on what exactly you want to do. The short answer would be that if you want to manage virtual machines, you want to use Vagrant. If you want to build and run an application environment,...
How to Run a Docker Image as a Container?
Docker runs processes in isolated containers. A container is a process that runs on a host. The host may be local or remote. When an operator executes docker run, the container process that runs is...
How to Remove Old and Unused Docker Images?
Since the docker version 1.13 you can use the docker prune command to remove all dangling data such as containers stopped, volumes without containers, and images with no containers. To remove dangl...
How to Remove Old Docker Containers?
You may have found docker rm command to remove a docker container. However, this works only for a single container and it would be very painful to run this command for every non-running docker cont...
How Do I Pass Environment Variables to Docker Containers?
It is always a good practice to separate the app from its configuration. It is not a good idea to have a database login credential defined as variables in the code of the application. This is why w...
How to Mount a Host Directory in a Docker Container?
If you want to mound a host directory in a Docker container, you have to main ways to do that: Using the ADD command: The simplest way is to use the dockers ADD command as shown below: ADD . /path/...
How to List Containers in Docker?
Running containers If you want to list all the running docker containers, you can use the docker container ls command, which takes the following form: docker container ls This command is valid on a...
Solved: The Input Device Is Not a TTY
If you try to execute a command inside the docker using the Jenkins or jus try to use the -it option in the docker run command, you will get the following error: the input device is not a TTY How t...
How to Include Files outside of Docker’s Build Context?
You may have ended up in a situation where you wanted to include a file from outside of Docker's build context using the ADD command, but the ADD command requires the path to be within the build co...
How to Remove a Docker Image?
To remove one or more specific images, you can use the docker rmi command. How to list all images If you want to list all the images before removing any, you can do they by running the following co...
How To Deal With Persistent Storage (e.g. Databases) In Docker?
The best way to deal with persistent data storage (such as a database) in Docker is to use Docker’s volume API (for docker 1.9.0 or newer) or use data-only containers for older versions of Docker. ...
How Do I Get into a Docker Container’s Shell?
If you want to explore containers file system it simply wan to get an access to containers shell, you can use one of the following options Using the docker exec command Docker version 1.3 or newer ...
How to Execute Multiple Commands in Docker-Compose?
It is possible to define and run multiple commands in the docker-compose.yml file. To execute multiple commands using Docker-Compose, structure the file in the following way: ... services: app: ...
Docker How to Change Repository Name or Rename Image?
Docker image Docker image name and tag are just an alias to a docker image id that looks similar to this d583c3ac45fd. If you want to change the name, run the following command: docker image tag ol...
How to Get a Docker Container’s Ip Address from the Host?
By default, the container is assigned an IP address for every Docker network it connects to. And each network is created with a default subnet mask, using it as a pool, later on, to give away the I...
How to Force Docker to Clean Build an Image?
When executing docker pull or docker run command, the daemon first checks for a similar image in the local machine by comparing the digests of the image. If it finds a match, the daemon simply crea...
How to Fix Docker Permission Denied Issue?
If you are struggling with the Docker permission denied error, we have prepared a quick fix for you. Step 1 - Create a docker group The first step is you create a docker group if you haven’t done i...
How to Explore Docker Container’s File System?
If you want to explore the Docker container’s file system, you can use on of the following methods. Using the docker exec command Docker version 1.3 or newer supports the docker exec command. This ...
How Do I Edit a File inside a Docker Container?
If you want to edit a file inside a docker container, you can follow these steps: 1. Find the id of the container To find the id of the running container, you can use the following command: docker ...
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