Compose: When using multiple files, ports map not override by the last.

[jaggerwang]

Docker version:
Docker for Mac beta
Version 1.12.0-rc2-beta16 (build: 9493)
f615be9fb245904fbdf1aa0cad251d418c869428

Command and output:
docker-compose -p zqctest -f docker-compose.yml -f docker-compose.test.yml up -d
Creating network "zqctest_default" with the default driver
Creating volume "zqctest_mongodb" with local driver
Creating volume "zqctest_server" with local driver
Creating zqctest_mongodb_1
Creating zqctest_server_1

ERROR: for server driver failed programming external connectivity on endpoint zqctest_server_1 (d5ff29cdb695cb720967f01ea3a6ac2876c4ae07063643f684dbc5179d599b58): Bind for 0.0.0.0:1323 failed: port is already allocated
ERROR: Encountered errors while bringing up the project.

Compose config files:
cat docker-compose.yml
version: "2"
services:
server:
image: daocloud.io/jaggerwang/zqc-server
environment:
ZQC_SERVER_DEBUG: "false"
ZQC_LOG_LEVEL: info
ports:
- 1323:1323
volumes:
- server:/data/zaiqiuchang/server
depends_on:
- mongodb
mongodb:
image: daocloud.io/jaggerwang/mongodb
volumes:
- mongodb:/data/mongodb

volumes:
server:
driver: local
mongodb:
driver: local

cat docker-compose.test.yml
version: "2"
services:
server:
ports:
- 1324:1323
environment:
ZQC_SERVER_DEBUG: "true"
ZQC_LOG_LEVEL: debug
volumes:
- ~/data/projects/zaiqiuchang/server:/data/zaiqiuchang/server

cat docker-compose.override.yml
version: "2"
services:
server:
environment:
ZQC_SERVER_DEBUG: "true"
ZQC_LOG_LEVEL: debug
volumes:
- ./:/go/src/zaiqiuchang.com/server
- ~/data/projects/zaiqiuchang/server:/data/zaiqiuchang/server

docker-compose -p zqctest ps
zqctest_mongodb_1 /bin/sh -c mongod --dbpath ... Up 27017/tcp
zqctest_server_1 /bin/sh -c supervisord Exit 128

There is already another envrioment started by command docker-compose -p zqctest up -d, so I changed ports to "1324:1323" in test config. But it not working.

docker-compose -p zqc ps
zqc_mongodb_1 /bin/sh -c mongod --dbpath ... Up 27017/tcp
zqc_server_1 /bin/sh -c supervisord Up 0.0.0.0:1323->1323/tcp

[jaggerwang]

After I moved ports option from base docker-compose to override and test, it worked. The config and status as follow:

cat docker-compose.yml
version: "2"
services:
server:
image: daocloud.io/jaggerwang/zqc-server
environment:
ZQC_SERVER_DEBUG: "false"
ZQC_LOG_LEVEL: info
volumes:
- server:/data/zaiqiuchang/server
depends_on:
- mongodb
mongodb:
image: daocloud.io/jaggerwang/mongodb
volumes:
- mongodb:/data/mongodb

volumes:
server:
driver: local
mongodb:
driver: local

cat docker-compose.override.yml
version: "2"
services:
server:
ports:
- 1323:1323
environment:
ZQC_SERVER_DEBUG: "true"
ZQC_LOG_LEVEL: debug
volumes:
- ./:/go/src/zaiqiuchang.com/server
- ~/data/projects/zaiqiuchang/server:/data/zaiqiuchang/server

cat docker-compose.test.yml
version: "2"
services:
server:
ports:
- 1324:1323
environment:
ZQC_SERVER_DEBUG: "true"
ZQC_LOG_LEVEL: debug
volumes:
- ~/data/projects/zaiqiuchang/server:/data/zaiqiuchang/server

docker-compose -p zqc ps
zqc_mongodb_1 /bin/sh -c mongod --dbpath ... Up 27017/tcp
zqc_server_1 /bin/sh -c supervisord Up 0.0.0.0:1323->1323/tcp

docker-compose -p zqctest ps
zqctest_mongodb_1 /bin/sh -c mongod --dbpath ... Up 27017/tcp
zqctest_server_1 /bin/sh -c supervisord Up 0.0.0.0:1324->1323/tcp

But why config in later file not overriding previous, is this a bug, or just I'm in wrong using.

[lindt]

citing https://docs.docker.com/compose/extends/

For the multi-value options ports, expose, external_links, dns, dns_search, and tmpfs, Compose concatenates both sets of values: