Notes for Docker

# verified cli can talk to engine
docker verison

# most config values of engine
docker info

# docker command line structure
# docker <command> <sub-command> (options)

# --publish 80:80 -> <host port>:<container port> 
docker container run --publish 80:80 nginx

# --detach, run the container background
# you'll get a container id, which is unique
docker container run --publish 80:80 --detach nginx

# list containers that are active
docker container ls -a

# --name, name your container
docker container run --publish 80:80 --detach  --name webhost nginx

# top command to see the process inside the container
docker container top webhost

# logs
docker container logs webhost

# stop a container
docker container stop <container id>

# remove a container
docker container rm <container id>

# if the container is running, you can find it.
ps aux | grep <pid or process name>

# process list in one container
docker container top

# details of one container config
docker container inspect

# performance stats for all containers, CPU/memory/IO/...
docker container stats

docker [container] commit [options] "Docker Newee" [REPOSITORY[:TAG]]

cat unbuntu.tar.gz | docker import - ubuntu:18.04

docker [image] build -t myImage:1.0

docker save -o xxx.tar TARGET_IMAGE:TAG_ID

docker load > dockerImageFile.tar

docker tag nginx:lastest wyy/nginx:1.0
docker push wyy/nginx:1.0

# start a container
docker run nginx

# list all containers
docker ps

# list containers that are active
docker ps -a

# stop a container
docker stop nginx

# remove a container
docker rm nginx

# list images
# docker image ls
# info: Repository | Tag | Image Id | Created | Size
docker images

# remove images
docker rmi nginx

# execute a command inside the container
docker exec name_of_a_container cat /etc/hosts

# run a container attach(frontend mode, which you can exec no commands)
docker run nginx

# run a container detach(backend mode, which you can exec commands while the container is active)
# output is the id of the process ${pid}
# when you want to stop in, exec ` docker attach ${pid}`
docker run -d nginx

# run tag `:4.0` specify the version of the image
# look up information about the image on docker hub
docker run redis:4.0

# run - STDIN, input for the container
docker run -i docker_image

# run - STDIN, input in a terminal for the container, interactive mode
docker run -it docker_image

# inspect container
docker inspect container_name

# container log
docker logs container_name

# 为本地镜像添加新的标签，image id一致，指向同一个镜像源（本地 ubuntu:latest），只是别名 
docker tag ubuntu:latest myubuntu:latest

# search from docker hub (order by stars)
docker search [option] nginx

# 清理临时镜像
docker image prune -f

docker run -e APP_COLOR=blue docker_image

docker inspect container_name

FROM Ubuntu
# start from a base OS

RUN apt-get update
RUN apt-get install python

RUN pip install flask
RUN pip install flask-mysql

COPY . /opt/source-code

ENTRYPOINT FLASK_APP=/opt/source-code/app.py flask run
# specify ENTRYPOINT, run the image as a container