Docker hub is basically one of the ways to get docker images and share dockerfiles.
Docker hub: https://hub.docker.com/
Here is an example of a docker container on docker hub. This is httpd, the Apache web server: https://hub.docker.com/_/httpd/
This container is provided as-is, and can be used by just calling it by its name (httpd). What that does is, it starts a very simple Docker container with all the default Apache docker container settings set.
That means all it does is run apache httpd on port 80, nothing else.
The docker pull command will basically fetch the latest version of a particular docker image, without any modifications. (The alternative is to customize the image by creating a Dockerfile based on the Dockerfile contained on Docker hub.)
$ docker pull httpd latest: Pulling from httpd c1f98057d627: Pull complete c35ece8820ad: Pull complete eeeee05b2d97: Pull complete b356f7d0a4b0: Pull complete cff60f000364: Pull complete f66e93df25da: Pull complete 5aa754215a2b: Pull complete ed544656f0fa: Pull complete ffafc39cb69f: Pull complete 4c5d8313f629: Pull complete 55a6feaaae56: Pull complete c1aa308548aa: Pull complete 919bf0916a6a: Pull complete eb58b1ce0fcd: Pull complete ce15017ba45e: Pull complete 617bdb3e78f6: Pull complete 738ba280808d: Pull complete 017d0384902a: Pull complete d61c615e53ce: Pull complete Digest: sha256:a5b5747c921fdac4e53197d2624ddad22fa9a13dfe31b305273be5149882c3e9 Status: Downloaded newer image for httpd:latest
Can also pull other docker containers. Here is a shorter list of dependencies/layers:
$ docker pull debian latest: Pulling from debian 0aa3f9bb64ef: Pull complete c1f98057d627: Already exists Digest: sha256:fa8fd9718d2697730acc9a374dc2e1d54719177f474abbc8d5f74ebad5cb8a30 Status: Downloaded newer image for debian:latest
To see the docker container images that are installed, use the
docker images command:
$ docker images REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE httpd latest d61c615e53ce 2 days ago 176.9 MB debian latest 0aa3f9bb64ef 2 days ago 123.4 MB hello-world latest 7a5a2d73abce 9 weeks ago 1.84 kB
Running docker images
If you want to run one of the images, use the docker run command. Give the container a name, and tell it what image to use.
$ docker run --name test -it debian
This also connects a TTY console to the container, so you have a basic bash shell on the virtual machine that runs the container.
One of the interesting things you can do is run Docker using the privileged flag, which basically gives Docker the same rights as root or as the user who ran Docker:
The --privileged flag gives all capabilities to the container, and it also lifts all the limitations enforced by the device cgroup controller. In other words, the container can then do almost everything that the host can do. This flag exists to allow special use-cases, like running Docker within Docker.
$ docker run -t -i --privileged ubuntu bash
Docker command line: https://docs.docker.com/engine/reference/commandline/cli/
Being in the docker group gives you serious root-level powers. Info about attack surface of Docker: https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface
Note that, as mentioned above, the --privileged flag allows Docker the same privileges as the user who ran the command.
dockernotes on the virtual microservice container platform
Installing the docker platform: Docker/Installing
Docker Hello World: Docker/Hello World
Creating Docker Containers:
Getting docker containers from docker hub: Docker/Dockerhub
Creating docker containers with dockerfiles: Docker/Dockerfiles
Managing Dockerfiles using git: Docker/Dockerfiles/Git
Running Docker Containers:
Running docker containers: Docker/Basics
Dealing with volumes in Docker images: Docker/Volumes
Removing Docker images: Docker/Removing Images
Rsync Docker Container: Docker/Rsync
Networking with Docker Containers:
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docker podspods are groups of docker containers that travel together
Docker pods are collections of Docker containers that are intended to run in concert for various applications.
Wireless Sensor Data Acquisition Pod
The wireless sensor data acquisition pod deploys containers
This pod uses the following technologies:
Deep Learning Pod
This pod utilizes the following technologies:
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