hkamel / containers

Everything one could wish to know about containers

containers

Everything one could wish to know about containers

Docker 101

Contents

• Networks

• Port Mappings

• Exec'ing Into Containers

• Volumes

• Image Building

• CMD v. ENTRYPOINT

SPecifying container Network

docker build -t server . && docker run --rm --network host server

curl as normal

curl localhost:8000/

Exec'ing Inside a Container

$ docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
13de88e52858        server              "./app"             6 seconds ago       Up 4 seconds                            vigilant_cray

$ docker exec -it 13de88e52858 bash
root@N501VW:/app# ls
app  file.log  go.mod  main.go
root@N501VW:/app# cat file.log

Port Mapping

$ docker build -t server . && docker run --rm -p 3000:8000 server

$ curl localhost:3000/

Mapping multiple ports and using UDP

$ docker build -t server . && docker run --rm -p 3000:8000 -p 8000:9000/udp server

$ docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS                                            NAMES
5c4386fe21ce        server              "./app"             4 seconds ago       Up 3 seconds        0.0.0.0:3000->8000/tcp, 0.0.0.0:8000->9000/udp   infallible_mayer

Volumes

$ docker build -t server . && docker run --rm -it -v ${PWD}:/app -p 8000:8000 server