Docker | Nam Hoai Nguyen

What & Why?

Docker is an open-source virtualization technology that makes it easy to build, test and deploy applications.

You can ship your applications in a container environment that houses everything your application need to run (tools, config, code,…)

Abbreviate

ps = process status: check running container (with a argument to show all)

i = interactive: used in docker exec or docker run

t = terminal: used in docker exec or docker run

m = memory

v = volume: mount volume in/out containers

-rm = remove: create temporary a container (will be removed after exits)

Installation

Official docs.

Client: OrbStack, official apps.

☝

OrbStack supports container.orb.local which points to the local server. It also supports logs, debugging and opening a terminal inside the container.

Docker Hub Container

References

Play with Docker - right on the web

General

1# docker's version
2docker --version
3
4# Remove any resources
5docker system prune
6
7# where're images stored?
8docker info # normally: /var/lib/docker
9

Images

1# Build image with Dockerfile
2docker buildx build -t v2daimg .
3# docker build -t <img_name> .
4# image name must be in lowercase
5# run again to update the build
6
7# Set target platform for build
8docker buildx build -t v2daimg --platform=linux/amd64 .
9
10# To know the host platform within a running container
11docker run --rm <image_name> uname -m
12# eg: aarch64
13
14# don't use the cached layer from previous build
15docker build --no-cache -t img_name .
16
17# Custom Dockerfile.abc
18docker build -t <img_name> . -f Dockerfile.abc

1# ram & cpu usages
2docker stats
3docker stats <container_name|container_id>
4
5# get ip address
6docker inspect <container_name|container_id> | grep IPAddress
7
8# check image's info
9docker inspect <image_id>

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