liabas-b / docker-help

This repository contains help about running and working with docker images and containers

SGT Docker

Here are the steps to setup production SGT environment:

• username is your docker username
• image is the name of your docker image
• flag is the flag of your docker image

Pulling docker images

First, we need to pull the images for postgres and the ruby on rails web server to our machine:

1. Login to docker hub: sudo docker login
2. Pull the postgres image: sudo docker pull liabasb/sgt-postgres
3. Pull the rails app image: sudo docker pull liabasb/sgt

## Running docker images

Running the postgres image into a container

1. sudo docker run --name my-postgresql -e POSTGRES_PASSWORD=mypassword -d postgres

Running the rails app image into a container for the first time

1. sudo docker run -ti --link my-postgresql:postgresql -p 8080:8080 username/image:flag /bin/bash
2. rake db:create db:migrate db:populate
3. sudo docker run -ti --link my-postgresql:postgresql -p 8080:8080 username/image:flag

Running the rails app image into a container when migrations are needed for the database

1. sudo docker run -ti --link my-postgresql:postgresql -p 8080:8080 username/image:flag /bin/bash
2. rake db:migrate
3. sudo docker run -ti --link my-postgresql:postgresql -p 8080:8080 username/image:flag

Running the rails app image again

1. sudo docker run -ti --link my-postgresql:postgresql -p 8080:8080 username/image:flag
2. sudo docker ps -a
3. sudo docker inspect username/image:flag

## Development

Updating SGT rails app image:

1. Work on the code; update the app...
2. Build the docker image from this code: sudo docker build -t username/image . (optionnaly set a flag to that image: sudo docker build -t username/image::flag .)
3. Check that the image has been created: sudo docker images
4. Check that the new image run properly: see running images
5. Push that new image to docker hub: sudo docker push username/image
6. Commit: sudo docker images