Docker

Installation

Basic installation:

I’m using Rocky Linux (RHEL)
Follow the official instruction first: link
Then in terminal : docker version, it reply something. Then docker run --rm hello-world to check if working correctly.
BUT! probably don’t install desktop, it may make the docker cannot detect GPU(very strange but after i uninstall desktop everything work)
Need to install docker engine
link from official install docker engine

ALSO follow this one Install the NVIDIA Container Toolkit
Another post might be helpful

check if container able to connect GPU:
sudo docker run -it --rm --gpus all ubuntu nvidia-smi
if no error, and print something (the driver info), then connected

Require “pass”

Because for linux system, it force to use authentication

gpg --full-generate-key: then follow the instruction, here I use the same username and email that I used for docker. Others are all default.
gpg --list-keys: find the key id here (the very long public key I guess)
pass init <your_gpg_key_id>: it will say “created directory xxx, password store initialized for xxx”
docker login -u <username>: fill in the docker username, and the password (when register on the docker)
try docker run --rm hello-world again

other issues:

“Cannot connect to the Docker daemon at …xxx.sock”

Because installed Docker Desktop previously, so need to remove the left things.

rm -rf ~/.docker/desktop
rm -f ~/.docker/config.json

put the user into docker’s group

Docker by default need sudo to run. But we can add yourself into docker’s user group:

sudo usermod -aG docker $USER

Then restart the shell. If you are on GNOME desktop, you need to log out and log in.

Concepts:

名词	是什么	举例 / 类比
Image	类似系统镜像（像 `.iso`），包含代码和依赖，可以用来启动容器	`ubuntu:20.04`, `nvidia/cuda:12.2`
Container	从 image 启动出来的“实例”，是一个运行中的环境，可以进、可以退出、可以删	类似“虚拟机正在运行”
Volume	专门用来挂载数据的东西（你可以把容器数据保存在这）	类似云盘、硬盘
Network	容器之间的虚拟网络设置（一般默认自动管理）	类似局域网

Basic operations:

Enter an Image:
docker run -it <image_name>
exit from the image
exit
delete the image:
docker rmi <Image_ID>