关于python：Docker角色创建错误 – 角色___不存在

Docker role creation error - role ___ does not exist

我是Docker的新手，我正试图用Postgres运行它。然后我尝试运行python测试用例，这些测试用例适用于其他人而不是我。

以下错误告诉我Docker可能正在努力创建角色foo：

E sqlalchemy.exc.OperationalError: (psycopg2.OperationalError)
FATAL: role"foo" does not exist

另一个错误：

E psycopg2.OperationalError: FATAL: role"foo" does not exist

Postgresql版本：mydb=# SELECT version();：

1 2	PostgreSQL 9.6.5 on x86_64-apple-darwin16.7.0, compiled by Apple LLVM version 8.1.0 (clang-802.0.42), 64-bit (1 row)

Docker版本

1	Version 17.06.2-ce-mac27 (19124)

使用此脚本运行Docker：

1	docker run -p 5432:5432 --env POSTGRES_PASSWORD="bar" --env POSTGRES_USER="foo" --env POSTGRES_DB="mydb" postgres

脚本输出：如您所见，它表示CREATE ROLE

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The files belonging to this database system will be owned by user"postgres".
This user must also own the server process.

The database cluster will be initialized with locale"en_US.utf8".
The default database encoding has accordingly been set to"UTF8".
The default text search configuration will be set to"english".

Data page checksums are disabled.

fixing permissions on existing directory /var/lib/postgresql/data ... ok
creating subdirectories ... ok
selecting default max_connections ... 100
selecting default shared_buffers ... 128MB
selecting dynamic shared memory implementation ... posix
creating configuration files ... ok
running bootstrap script ... ok
performing post-bootstrap initialization ... ok
syncing data to disk ... ok

Success. You can now start the database server using:

pg_ctl -D /var/lib/postgresql/data -l logfile start

WARNING: enabling"trust" authentication for local connections
You can change this by editing pg_hba.conf or using the option -A, or
--auth-local and --auth-host, the next time you run initdb.
waiting for server to start....LOG: could not bind IPv6 socket: Cannot assign requested address
HINT: Is another postmaster already running on port 5432? If not, wait a few seconds and retry.
LOG: database system was shut down at 2017-09-26 21:28:17 UTC
LOG: MultiXact member wraparound protections are now enabled
LOG: database system is ready to accept connections
LOG: autovacuum launcher started
done
server started
CREATE DATABASE

CREATE ROLE

/usr/local/bin/docker-entrypoint.sh: ignoring /docker-entrypoint-initdb.d/*

LOG: received fast shutdown request
LOG: aborting any active transactions
LOG: autovacuum launcher shutting down
waiting for server to shut down....LOG: shutting down
LOG: database system is shut down
done
server stopped

PostgreSQL init process complete; ready for start up.

LOG: database system was shut down at 2017-09-26 21:28:19 UTC
LOG: MultiXact member wraparound protections are now enabled
LOG: database system is ready to accept connections
LOG: autovacuum launcher started

编辑

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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
bbab7eb98fcf postgres "docker-entrypoint..." 10 seconds ago Up 11 seconds 0.0.0.0:5432->5432/tcp hardcore_wilson
a6a1e2e313b8 postgres "docker-entrypoint..." 16 minutes ago Exited (0) 6 minutes ago nervous_banach

看起来像psycopg2尝试本地套接字连接。如果是通过TCP连接，您会看到以下异常：

password authentication failed for user"foo"

容器日志中的错误：

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FATAL: password authentication failed for user"foo"
DETAIL: Role"foo" does not exist.
Connection matched pg_hba.conf line 95:"host all all all md5"

确保已设置host连接参数。如果没有设置，psycopg2将回退到使用UNIX套接字。

编辑：

当传递localhost连接参数时，psycopg2似乎更喜欢UNIX套接字用于连接。如果有两个postgres实例正在运行，一个监听UNIX套接字，一个监听TCP端口5432，psycopg2将在传递类似postgresql://localhost:5432的URL时通过UNIX域套接字连接。