#DockStack
DockStack is a Docker ambassador based on SmartStack https://nerds.airbnb.com/smartstack-service-discovery-cloud/. It uses zookeeper or etcd (WIP) as discovery service.
DockStack is composed of two tools:
- Nerve, a service registration daemon that performs health checks https://github.com/airbnb/nerve
- Synapse, a transparent service discovery framework that proxyfies the connections. It uses HAProxy to proxy the connections https://github.com/airbnb/synapse
Both tools use a YAML config file, which is not ideal to use with Docker. A wrapper script heavily simplifies the generation of this files via CLI.
##Setup ####Zookeeper You can easily setup Zookeeper on your hosts using https://registry.hub.docker.com/u/thefactory/zookeeper-exhibitor/
####MySQL Any other service will work
- Spawn a MySQL container
host1 $ docker run -d --name mysql -p :3306 -e MYSQL_ROOT_PASSWORD=test mysql
- Create an healt-check user
host1 $ docker exec -ti mysql mysql -u root -p -e 'CREATE USER 'haproxy_check'@'%'; FLUSH PRIVILEGES;'
####Nerve
host1 $ docker run \
-ti --rm \ # -d
-v /usr/bin/docker:/usr/bin/docker:ro \
-v /lib64/libdevmapper.so.1.02:/lib/libdevmapper.so.1.02:ro \
-v /var/run/docker.sock:/var/run/docker.sock \
-e SERVICE_HOST=176.31.235.180 \
asiragusa/nerve \
-d zk:https://<zookeeper_hosts comma separated>/nerve \
-s mysql:tcp:mysql:3306:/test
####Synapse
host2 $ docker run \
-ti --rm \ # -d
--name synapse
asiragusa/synapse
-d zk:https://<zookeeper_hosts comma separated>/nerve \
-s mysql:mysql:/test
####Testing Here the magic happens! (Running a mysql image, as it carries by default mysql-client)
host2 $ docker run -ti --rm --link synapse:db mysql:latest mysql -u root -h db -p
The connection is transparently proxified by HAProxy
##TODO Create more service config files and examples ready to use
##Authors
##Special thanks To Jérôme Petazzoni for the great idea!