dcoker-compose.yml.txt

docker-compose is an add on in the docker engine
docker-compose.yml
version"3"
services:
  web:
   image: nginx
   ports: -80:80
  cache:
   image: redis

port isn't needed for redis when we're using it for cache purpose

docker-compose config
docker-compose up -d
docker-compose up
docker-compose top cache

docker-compose up --scale cache=2 -d */ we can scale the containers which isn't attached with the ports

docker-compose down */ which will delete the images as well

docker images

docker rmi imageid */image id is there in "docker images"


docker network list

bridge network -- it will autoconnect with all the machines

docker-compose -p dev ps */naming convention it will show in dev_cache 

docker-compose.yml
version"3"
services:
  web:
   image: nginx
   container_name: lb
   ports: 
    - "80:80"
  cache:
   container_name: caching
   image: redis
   

docker-compose -p uat up -d
creating n/w "uat_default" with default driver

docker-compose -p uat ps

out put will be in the name of container name

note: supervisord can be used to run multiple services in a container

dcoker - immutable infrastructure, shouldn't be changed (test, baked & build and it will run)

prod - a service should be running in a container


Volumes:

docker-compose.yml
version"3"
services:
  web:
   image: nginx
   container_name: lb
   ports: 
    - "80:80"
   volumes:
     -data:/etc/niginx
     -webdata:/usr/share/nginx/html
  cache:
   container_name: caching
   image: redis
volumes:
  data:
  webdata:

dcoker-compose -p uat down
docker volume list
dcoker-compose config
docker compose up -d
docker volume list
docker volume inspect projects_data
cd /var/lib/docker/volumes/projects_data/_data/conf.d

volumes will be crated in the location
/var/lib/docker/volumes/
/var/lib/docker/volumes/projects_data/_data/

index.html */ html changes doesn't need service reload otheriwse we need to do service restart

docker-compose restart
dcoker-compose lb restart --- it's not service name
docker-compose web restart --- web is the service name

build

FROM nginx
RUN echo "Welcome to Doecker" >> /usr/share/nginx/index.html

docker-compose.yml
version"3"
services:
  web:
   build: . or httpd/. */location of the docker file
   container_name: lb
   ports: 
    - "80:80"
   volumes:
     -data:/etc/niginx
     -webdata:/usr/share/nginx/html/index.html
  cache:
   container_name: caching
   image: redis
volumes:
  data:
  webdata:

docker volume prune */ will delete all the unused volumes
dcoker volume rm */volume name
docker-compose up -d --build

docker images rmi imageid