How do I run a docker instance from a DockerFile

Question

I finally figured out how to get docker up and running    docker run --name my-forum-nodebb --link my-forum-redis redis -p 80 80 -p 443 443 -p 4567 4567 -P -t -i nodebb docker ubuntu   I linked it to a redis instance  cool    This is from scratch and I assume that when I created the redis instance   docker run --name my-forum-redis -d -p 6379 6379 nodebb docker ubuntu-redis   it pulls the image from a remote repo   NodeBB offers a Dockerfile https   github com NodeBB NodeBB blob master Dockerfile I am not really quite sure how to use it  I am assuming that I can somehow create a local environment by calling this Dockerfile on my remote   Is this correct  If so how can I create the local instance pointing to the remote

User · Answer

You cannot start a container from a Dockerfile.

The process goes like this:

Dockerfile =[docker build]=> Docker image =[docker run]=> Docker container

To start (or run) a container you need an image. To create an image you need to build the Dockerfile[1].

[1]: you can also docker import an image from a tarball or again docker load.

User · Answer

Download the file and from the same directory run docker build -t nodebb    This will give you an image on your local machine that s named nodebb that you can launch an container from with docker run -d nodebb  you can change nodebb to your own name

User · Answer

While other answers were usable  this really helped me  so I am putting it also here  From the documentation   Instead of specifying a context  you can pass a single Dockerfile in the URL or pipe the file in via STDIN  To pipe a Dockerfile from STDIN     docker build -  lt  Dockerfile   With Powershell on Windows  you can run   Get-Content Dockerfile   docker build -  When the build is done  run command  docker image ls  You will see something like this  REPOSITORY                 TAG                 IMAGE ID            CREATED             SIZE  lt none gt                       lt none gt               123456789        39 seconds ago      422MB  Copy your actual IMAGE ID and then run docker run 123456789  Where the number at the end is the actual Image ID from previous step If you do not want to remember the image id  you can tag your image by docker tag 123456789 pavel pavel-build  Which will tag your image as pavel pavel-build

User · Answer

Straightforward and easy solution is   docker build     gt         gt  Successfully built a3e628814c67 docker run -p 3000 3000 a3e628814c67   3000 - can be any port  a3e628814c68 - hash result given by success build command  NOTE  you should be within directory that contains Dockerfile

[docker] How do I run a docker instance from a DockerFile?

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