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+# 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
+