root@server1:/srv/pillar# find ./
./
./base
./base/top.sls
./base/_global.sls
./prod
./prod/top.sls
./prod/_global.sls
./dev
./dev/top.sls
./dev/_global.sls


root@server1:/srv/pillar# cat prod/top.sls
prod:
  '*':
    - _global


root@server1:/srv/pillar# cat prod/_global.sls
pillar_environment: prod


root@server1:/srv/pillar# cat dev/top.sls
dev:
  '*':
    - _global


root@server1:/srv/pillar# cat dev/_global.sls
pillar_environment: dev


root@server1:/srv/pillar# salt \* config.get environment
server2.somedomain.org:
    dev
server1.somedomain.org:
    prod




root@server1:/srv/pillar# salt \* pillar.data
server1.somedomain.org:
    ----------
    pillar_environment:
        dev
server2.somedomain.org:
    ----------
    pillar_environment:
        dev