# CLI to List system namespaces.
lsns --help

# list all ns
lsns

# 1. Set up Docker's apt repository.

# Add Docker's official GPG key:
sudo apt-get update
sudo apt-get install ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc

# Add the repository to Apt sources:
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update

# 2. Install the Docker packages.
sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

# Docker Service Start
sudo service docker start

# Verify that the Docker Engine installation is successful by running the hello-world image.
sudo docker run hello-world

# download an docker image, eg nginx
docker pull nginx

# run image, use -d to run in background
docker run --name exercise2 -p 8080:80 nginx

# check in browser
http://localhost:8080/

# check docker running process
docker ps

# stop
docker stop exercise2

# restart
docker start exercise2

# check logs
docker logs exercise2

# Get PID for docker container
docker inspect --format '{{.State.Pid}}' exercise2

# List docker container ns
sudo ls -la /proc/7059/ns

ADD	Add local or remote files and directories.
ARG	Use build-time variables.
CMD	Specify default commands.
COPY	Copy files and directories.
ENTRYPOINT	Specify default executable.
ENV	Set environment variables.
EXPOSE	Describe which ports your application is listening on.
FROM	Create a new build stage from a base image.
HEALTHCHECK	Check a container's health on startup.
LABEL	Add metadata to an image.
MAINTAINER	Specify the author of an image.
ONBUILD	Specify instructions for when the image is used in a build.
RUN	Execute build commands.
SHELL	Set the default shell of an image.
STOPSIGNAL	Specify the system call signal for exiting a container.
USER	Set user and group ID.
VOLUME	Create volume mounts.
WORKDIR	Change working directory.

# Build a docker container
docker build -t node-api --no-cache .

# Run a docker container
docker run -p 3000:3000 node-api

# Remove image
docker rmi node-api --force

# Clear cache!
docker system prune -a

# Dockerfile

FROM node:22-alpine

RUN mkdir -p /home/node/app/node_modules && chown -R node:node /home/node/app

WORKDIR /home/node/app

COPY package*.json ./

USER node

RUN npm install

COPY --chown=node:node . .

EXPOSE 3000

ENTRYPOINT [ "node", "index.js" ]

gcloud config set project milindsingh

gcloud auth login

gcloud auth configure-docker asia-south2-docker.pkg.dev

docker build -t asia-south2-docker.pkg.dev/milindsingh/docker-meetup/node-api:2024.07.06.1 .

docker push asia-south2-docker.pkg.dev/milindsingh/docker-meetup/node-api:2024.07.06.1

# compose.yaml

services:
  nginx:
    image: "nginx"
    ports:
      - "80:80"
      
  node:
  	image: "node"
    
  redis:
    image: "redis:alpine"