Technowise-Meetup-Notes.md

Technowise Docker Meetup Notes

<create new shell session : tab 1>

$ git clone https://github.com/shadjachaudhari13/nodeshark.git

$ cd nodeshark

$ docker run node:10-alpine

$ docker ps # see no running containers

$ docker ps -a. # see one stopped container

$ docker run node:10-alpine sh # runs process 'sh' once container is running, exits once process is complete

$ docker ps # see no running containers

$ docker ps -a # see two stopped containers

$ docker run -it node:10-alpine sh # this is your first running {container 1}

<create new shell session : tab 2>

$ pwd # nodeshark directory from Line 4

`$ docker ps # get ID of a running container

$ docker cp . <container 1>:/. # copy contents from current dir nodeshark to container root filesystem at /

<switch to shell session: tab 1 from Line 2>

$ ls # contents copied can be seen here

$ pwd # should show just /. as its a the root filesystem for container

$ npm install # to fetch dependencies using package.json

$ export PORT=5050

$ node app.js # app is now running at port 5050

<switch to shell session: tab 2 from Line 12>

$ docker exec -it <container 1> sh # opens door to already running container

$ wget http://localhost:5050 # index.html is downloaded

$ exit # come out of container, this also stops the container

$ docker rm <container 1 ID> # removes the stopped container

"CMD node app.js" add this as last line in crude.Dockerfile

$ docker build -f crude.Dockerfile .

$ docker run -d -p 5050:5050 <image-id>. # this is {container 2}

[access application in web browser localhost:5050]

$ docker exec -it <container 2> sh

$ whoami # show "root" default user is root unless specified otherwise

$ ls # contents of nodeshark dir

$ pwd # shows just "/"

$ uname -a # shows alpine linux distribution

$ printenv # show PORT as environment variable set

$ ls node_modules # node packages downloaded by "npm install"

$ exit

[Let's build same dockerfile again.]

$ docker build -f crude.Dockerfile .

[all build log lines say "using cache"]

add "RUN ls -la node_modules" before "CMD node app.js" in crude.Dockerfile

$ docker build -f crude.Dockerfile .

$ docker build . --no-cache

$ docker build <git repo url>

$ docker tag <image-id> <repo-name>:<tag>

$ docker tag 12345678 your-name/nodeshark:mydemo

$ docker push your-name/nodeshark:mydemo

$ which docker # see what you installed where you installed

$ git clone https://github.com/shadjachaudhari13/expense-tracker-nodejs.git

$ cd expense-tracker-nodejs

$ docker-compose up

$ docker-compose -f docker-compose-with-persist-data.yaml up

$ docker-compose -f docker-compose-node-dependencies.yaml up