docker run --name some-mongo -d mongo:2
docker run --name some-elasticsearch -d elasticsearch:2 elasticsearch -Des.cluster.name="graylog"
docker run --link some-mongo:mongo --link some-elasticsearch:elasticsearch -p 9000:9000 -e GRAYLOG_WEB_ENDPOINT_URI="http://127.0.0.1:9000/api" -d graylog2/server

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
755577e84f2d graylog2/server "/docker-entrypoint.s" 23 minutes ago Up 23 minutes 0.0.0.0:9000->9000/tcp, 12900/tcp jolly_perlman
77cd7e84fcc8 elasticsearch:2 "/docker-entrypoint.s" 23 minutes ago Up 23 minutes 9200/tcp, 9300/tcp some-elasticsearch
718b27fbc679 mongo:2 "/entrypoint.sh mongo" 25 minutes ago Up 25 minutes 27017/tcp some-mongo