Docker – Basic Cheat Sheet

docker.com
docker.com

As a learning curve, I had marked Docker in my list

So just tipping some quick commands for your and my own reference as it is not a primary tool I am using day-to-day

Display Docker Images:

$ docker images

Run Docker Image:

$ docker run hello-world

Note: If you do not have an image in your local machine, docker will look into docker hub (over the internet)

Write a docker file:

$ mkdir dockerfolder

$ cd dockerfolder

$ vim newdockerfile

RUN apt-get -y update && apt-get install -y telnet

save and close your newdockerfile “wq!”

Build and image from our Docker File

$ docker build -t telnet-install .

Note: we are using a period in the end of docker build command to represent the newdockerfile within the directory

If you want to run new build file: “docker run telnet-install”

Tag your image-id: (required if you want to push to docker hub)

$ docker tag 693bce725149 terminaltolinux/telnet-install:latest

Note: image id can be found from “docker images” command

Login to docker hub:

$ docker login –username=terminaltolinux –email=terminal@linux.com

Note: after docker login command it will prompt for password, prior have a docker hub account

Push docker image to docker hub account:

$ docker push terminaltolinux/telnet-install

Note: Verify from docker hub account, the docker image will be pushed. Prior create a repo on docker hub

Delete a docker image:

$ docker rmi -f terminaltolinux/telnet-install

Pull docker image from docker hub account:

$ docker run terminaltolinux/telnet-install

Note: it will not find in the local machine as we deleted earlier and will fetch it online and run it, however “docker pull terminaltolinux/telnet-install” can also be used to just pull the image.

Search docker image:

$ docker search mysql

Search docker image with number of stars:

$ docker search -s 1 mysql

Run docker image in background:

$ docker run -d mysql

Run docker image with interactive session:

$ docker run -it ubuntu

List running containers

$ dockers ps

Inspect a container

$ docker inspect <container-id>

Note: container-id will be available from “docker ps”

Logs of standard error or standard out

$ docker log <container-id>

Commit changes to container and save as a separate image. (tag it):

$ docker commit <container-id> nginx-ubuntu

Port binding to container

$ docker run -d -p 6379 reds

Note: -p binds port but if we wanted to map this port directly on the host, we will use the option -p 6379:6379 and if with particular ip then -p 127.0.0.1:6379:6379

Binding directories

$ docker run -d -v “/home/docker/data”:/data reds

Start a container

$ docker start <container-id>

Stop a container

$ docker stop <container-id>

Remove an exited container

$ docker rm <container-id>

Restart a container

$ docker restart <container-id>

Use docker with proxy:

If you want to run docker with environment proxy, edit /etc/default/docker amend your entry for http_proxy

TIP:

If we don’t tell docker explicitly we want to map port, it will block access through that port (because containers are isolated until you tell them you want access)

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