您收到的身份验证错误将有很大帮助！
我用您的参数启动了postgres图像：
docker run --name db -d -e POSTGRES_PASSWORD=docker -e POSTGRES_USER=docker postgres
然后我执行了：
docker exec -it db psql -U docker userpsql: FATAL: database "user" does not exist
我收到您期望的错误消息，因为我具有信任身份验证：
docker exec -it db cat /var/lib/postgresql/data/pg_hba.conf | grep -v '^#'local all all trusthost all all 127.0.0.1/32 trusthost all all ::1/128 trusthost all all 0.0.0.0/0 md5
为了模拟您的Web容器，我将运行postgres容器的另一个实例并链接db容器，然后再连接回db容器：
core@ku1 /tmp/i $ docker run --rm --name web --link db:db -it postgres psql -h db -Udocker userPassword for user docker: psql: FATAL: password authentication failed for user "docker"
如果输入了错误的密码，则会收到身份验证错误。但是，如果我输入正确的密码：
core@ku1 /tmp/i $ docker run --rm --name web --link db:db -it postgres psql -h db -Udocker userPassword for user docker: psql: FATAL: database "user" does not exist
一切似乎都正常工作。我将它们全部放入yaml文件中，并进行了同样的测试：
web: image: postgres command: sleep 999 ports: - "62576:62576" links: - dbdb: image: postgres environment: POSTGRES_PASSWORD: docker POSTGRES_USER: docker
然后用docker-compose启动它：
core@ku1 /tmp/i $ docker-compose -f dc.yaml upCreating i_db_1...Creating i_web_1...Attaching to i_db_1, i_web_1db_1 | okdb_1 | creating template1 database in /var/lib/postgresql/data/base/1 ... okdb_1 | initializing pg_authid ... okdb_1 | initializing dependencies ... okdb_1 | creating system views ... okdb_1 | loading system objects' descriptions ... okdb_1 | creating collations ... okdb_1 | creating conversions ... okdb_1 | creating dictionaries ... okdb_1 | setting privileges on built-in objects ... okdb_1 | creating information schema ... okdb_1 | loading PL/pgSQL server-side language ... okdb_1 | vacuuming database template1 ... okdb_1 | copying template1 to template0 ... okdb_1 | copying template1 to postgres ... okdb_1 | syncing data to disk ... okdb_1 | db_1 | WARNING: enabling "trust" authentication for local connectionsdb_1 | You can change this by editing pg_hba.conf or using the option -A, ordb_1 | --auth-local and --auth-host, the next time you run initdb.db_1 | db_1 | Success. You can now start the database server using:db_1 | db_1 | postgres -D /var/lib/postgresql/datadb_1 | ordb_1 | pg_ctl -D /var/lib/postgresql/data -l logfile startdb_1 | db_1 | db_1 | PostgreSQL stand-alone backend 9.4.1db_1 | backend> statement: CREATE DATAbase "docker" ;db_1 | db_1 | backend> db_1 | db_1 | PostgreSQL stand-alone backend 9.4.1db_1 | backend> statement: CREATE USER "docker" WITH SUPERUSER PASSWORD 'docker' ;db_1 | db_1 | backend> db_1 | LOG: database system was shut down at 2015-04-12 22:01:12 UTCdb_1 | LOG: database system is ready to accept connectionsdb_1 | LOG: autovacuum launcher started^Z[1]+ Stopped docker-compose -f dc.yaml upcore@ku1 /tmp/i $ bg
您可以看到用户和密码已创建。我执行：
core@ku1 /tmp/i $ docker exec -it i_web_1 psql -Udocker -h db userPassword for user docker: psql: FATAL: password authentication failed for user "docker"core@ku1 /tmp/i $db_1 | FATAL: password authentication failed for user "docker"db_1 | DETAIL: Connection matched pg_hba.conf line 95: "host all all 0.0.0.0/0 md5"core@ku1 /tmp/i $ docker exec -it i_web_1 psql -Udocker -h db userPassword for user docker: psql: FATAL: database "user" does not existdb_1 | FATAL: database "user" does not exist
因此，我唯一能想到的是您正在尝试从主机而不是Web容器连接到数据库？还是您的Web容器未将“
db”用作连接的主机？您对Web容器的定义不包含任何我可以看到的错误。
