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Docker

reference:

Table of contents

  1. TOC

Example:

docker run --entrypoint "bash" -p 80 -p 443 -p 10022:22 -e LANG=C.UTF-8 --name centos3 -dt a5fc4f
docker tag c3527aa35c09 tagname
docker inspect container_name # list all info
docker log container_name

Dockerfile

docker build Dockerfile -t tagname

FROM ubuntu

RUN apt-get update
RUN apt-get install python
RUN pip install flask

COPY . /opt/source-code

# container exits when this entry point exits
ENTRYPOINT ["nginx"]
    # overriden by --entrypoint "nginx" option

CMD ["-c", "/etc/nginx/default.conf"]
    # to override the command
    # docker run ubuntu -c /etc/nginx/default.conf

Compose

docker-compose up !

<container name>:
	build: <a directory whih a Dockerfile in it, from which we can build the container. 
	image: <image name>
	ports:
		- <internal port>:<external port>
	link:
		- <another container name>

crossref: https://magic3007.github.io/docs/docs/Cheatsheet/docker/

Networking

Default:

  • Bridge mode: a container connected to by default
    • To create a new subnetwork: docker network create --driver bridge --subnet 182.18.0.0/16 subnetwork name
    • see all networking setting: docker inspect blissful-hopper
  • --network=none
  • Host: --network=host

containers reach each other by:

  • IP address: BAD praticse
  • Container name! (docker has a built in DNS server)

Storage

file system: var/lib/docker

  • layered architecture (like git)
  • CoW

Volume (to persist the data):

docker volume create data_volume  
# create a folder at /var/lib/docker/volumes/data_volume
docker run -v data_volume:/var/lib/mysql mysql
# /var/lib/mysql is mapped to the host folder
docker run -v /data/mysql:/var/lib/mysql mysql
# volume mount: tmp -> /data/mysql
# binding mount: /var/lib/mysql -> tmp

# -v is obsolete
docker run --mount type=bind,source=/data/mysql,target=/var/lib/mysql mysql

Storage drivers: AUFS, ZFS, BTRFS, Device Mapper, Overlay, Overlay2