setup drone continuous integration with github - docker

Question

I'm trying to setup a CI server inside a corporate network with drone (open source edition). Its author describes drone as very simple solution even for programmer (as I am), though some moments are not clear for me (may be official documentation misses them).
First, I've made up an docker image for my rails application: rails-qna.
Next, composing drone images:
docker-compose.yml:
version: '2'
services:
drone-server:
image: drone/drone:0.5
ports:
- 80:8000
volumes:
- ./drone:/var/lib/drone/
restart: always
environment:
- DRONE_OPEN=true
- DRONE_ADMIN=khataev
- DRONE_GITHUB_CLIENT=github-client-string
- DRONE_GITHUB_SECRET=github-secret-string
- DRONE_SECRET=drone-secret-string
drone-agent:
image: drone/drone:0.5
command: agent
restart: always
depends_on: [ drone-server ]
volumes:
- /var/run/docker.sock:/var/run/docker.sock
environment:
- DRONE_SERVER=ws://drone-server:8000/ws/broker
- DRONE_SECRET=drone-secret-string
Application is registered on Github and secret/client strings are provided.
I placed .drone.yml file into my project repository:
pipeline:
build:
image: rails-qna
commands:
- bundle exec rake db:drop
- bundle exec rake db:create
- bundle exec rake db:migrate
- bundle exec rspec
Unclear moments:
1) While registering OAuth application on github, we should specify Homepage URL and authorization callback URL. Where should they point to? Drone server container? Guessing that so, I specified
mycorporatedomain.com:3005
and
mycorporatedomain.com:3005/authorize
and setup port forwarding from 3005 port to 80 port of host, where drone docker is running. May be I'm wrong?
2) What should I specify in key DRONE_GITHUB_URL?
https://github.com or full path to my project repository, i.e.
https://github.com/khataev/qna?
3) What if I want to build some branch other than master? Were should I specify it? For now drone ready branch (with .drone.yml) is not a master branch - would it work?
4) Why DRONE_GITHUB_GIT_USERNAME and DRONE_GITHUB_GIT_PASSWORD are optional? How it is supposed to work if, I don't specify username and password for my github account?
5) When I start drone images with docker up, I get this errors:
→ docker-compose up
Starting drone_drone-server_1
Starting drone_drone-agent_1
Attaching to drone_drone-server_1, drone_drone-agent_1
drone-server_1 | time="2017-03-04T17:00:33Z" level=fatal msg="version control system not configured"
drone-agent_1 | 1:M 04 Mar 17:00:35.208 * connecting to server ws://drone-server:8000/ws/broker
drone-agent_1 | 1:M 04 Mar 17:00:35.229 # connection failed, retry in 15s. websocket.Dial ws://drone-server:8000/ws/broker: dial tcp: lookup drone-server on 127.0.0.11:53: no such host
drone_drone-server_1 exited with code 1
drone-server_1 | time="2017-03-04T16:53:38Z" level=fatal msg="version control system not configured"
UPD
5) this was solved - forgot to specify
DRONE_GITHUB=true

Answer 1

Homepage URL is the address of the server where drone is running on.
E.g. http://155.200.100.0
Authorize URL is the same address appended by /authorize
Eg. http://155.200.100.0/authorize
You dont have to specify that. DRONE_GITHUB=true says drone to use github url.
You can limit a single section to a branch or the whole drone build.
Single Section:
pipeline:
build:
image: node:latest
commands:
- npm install
- npm test
when:
branch: master
Whole build process:
pipeline:
build:
image: node:latest
commands:
- npm install
- npm test
branches: master
You don't need username and password when using OAuth.
Source:
http://readme.drone.io/admin/setup-github/
http://readme.drone.io/usage/skipping-builds/
http://readme.drone.io/usage/skipping-build-steps/
UPDATE:
Documentation is shifted to http://docs.drone.io/ due to version 0.6 of Drone