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$ sudo groupadd docker
$ sudo usermod -aG docker $USER

or

$ sudo gpasswd -a $USER docker

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# systemctl start docker
# systemctl enable docker

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# cat /etc/docker/daemon.json
{
        "registry-mirrors": ["https://registry.docker-cn.com","https://nrbewqda.mirror.aliyuncs.com","https://dmmxhzvq.mirror.aliyuncs.com"]
}

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$ docker run hello-world
$ docker pull ubuntu:latest
$ docker pull fedora:29
$ docker pull dokken/ubuntu-20.10
$ docker images

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$ docker run -dit --name ubuntu-20.10 dokken/ubuntu-20.10
$ docker exec -it ubuntu-20.10 /bin/bash
$ apt-get update
$ apt-get install vim

$ docker run unbutu:latest /bin/echo 'Hello World'
$ docker run -t -i ubuntu:latest /bin/bash

$ docker run -dit bash
$ docker container ls
$ docker attach $id	<- container will stop after exit stdin
$ docker exec -it $id bash

$ docker container stop $id

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$ docker inspect -f '{{.State.Pid}}' $id
$ sudo mkdir -p /var/run/netns
$ sudo ln -s /proc/$pid/ns/net /var/run/netns/$pid

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$ docker run -dit --cap-add=NET_ADMIN bash <- add net admin permisson

$ docker network create -d macvlan --subnet=192.168.100.0/24 --gateway=192.168.100.1 -o parent=p4p1 pub_net
$ docker run -dit --cap-add=NET_ADMIN --net=pub_net centos
$ docker exec -it $id bash

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$ docker ps
$ docker commit $id new_name

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$ docker container ls -a
$ docker container rm $id

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dnf install -y grubby
grubby --update-kernel=ALL --args="systemd.unified_cgroup_hierarchy=0"