Common Docker Commands

• Docker official website

• Official site: https://www.docker.com/

• Hub: https://www.docker.com/products/docker-hub/

• Docker concepts

• image: a packaged snapshot

• container: a running instance of an image

• repository: a place to store images

Docker Installation

## mac
brew install --cask --appdir=/Applications docker

## centos
sudo yum update
sudo yum install -y yum-utils
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
sudo yum install docker-ce docker-ce-cli containerd.io
sudo systemctl start docker
sudo systemctl enable docker
sudo docker --version

Common Docker Images

# alpine
docker run -itd alpine /bin/sh

# memcached
docker run -d -p 11211:11211 memcached

Frequently Used Commands

# pull
docker pull image-name

# images
docker images
docker rmi image-id
docker build -t image-name:tag .

# container
docker run -d -p host-port:container-port image-name
docker ps -a
docker rm -f container-id
docker logs container-id
docker exec -it container-id /bin/bash

# container run cpu memory
docker run -d -p host-port:container-port --cpus="2" --memory="200m" --restart="always" --name="container-name" image-name
docker inspect --format='{{.HostConfig.NanoCpus}}' <container_id_or_name>
docker inspect --format='{{.HostConfig.Memory}}' <container_id_or_name>

docker run

## Basic
docker run ubuntu:15.10 /bin/echo "Hello world"

## Interactive
docker run -i -t ubuntu:15.10 /bin/bash

## Background
docker run -d ubuntu:15.10 /bin/sh -c "while true; do echo hello world; sleep 1; done"

## name
docker run -itd --name ubuntu-test ubuntu /bin/bash

Docker Containers

## List running containers
docker ps

## List all containers, including stopped ones
docker ps -a

## Stop a running container
docker stop id

## Restart a container
docker restart id

## Remove a container
docker rm -f 1e560fca3906

## View container logs
docker logs id

## Enter a container
docker exec -it 243c32535da7 /bin/bash

## Export a container
docker export 1e560fca3906 > ubuntu.tar

## Import a container
docker import - test/ubuntu:v1

## View container processes
docker top id

Docker Images

## List images
docker images

## Pull an image
docker pull ubuntu

## Search for an image
docker search httpd

## Remove an image
docker rmi hello-world

## Update an image
docker commit -m="has update" -a="runoob" e218edb10161 runoob/ubuntu:v2

## Build an image
### dockerfile
#### Each instruction creates a new layer on the image. Each instruction prefix must be uppercase.
#### The first FROM specifies which base image to use.
#### RUN tells Docker to execute commands inside the image, installing packages, etc.
#### Then, use the Dockerfile to build an image via the docker build command.
FROM    centos:6.7
MAINTAINER      Fisher "fisher@sudops.com"

RUN     /bin/echo 'root:123456' |chpasswd
RUN     useradd runoob
RUN     /bin/echo 'runoob:123456' |chpasswd
RUN     /bin/echo -e "LANG=\"en_US.UTF-8\"" >/etc/default/local
EXPOSE  22
EXPOSE  80
CMD     /usr/sbin/sshd -D

### build
docker build -t runoob/centos:6.7 .

## Tag an image
docker tag 860c279d2fec runoob/centos:dev