Python &引用；psql:fe_sendauth:未提供密码；将postgres作为Docker服务运行时

我正在尝试使用以下

Docker Compose.yml

运行以下Docker Compose多容器应用程序：

version: '3'

services:
  postgres:
    image: postgres
    environment:
      - POSTGRES_USER=iperuser
      - POSTGRES_PASSWORD=iperpassword
      - PGDATA=/var/lib/postgresql/data/apks
      - POSTGRES_DB=iper_apks

  alchemy:
    build: ./alchemy
    environment:
      - PGHOST=postgres
      - PGPORT=5432
      - PGUSER=iperuser
    links:
      - postgres

我想使用

wait for postgres.sh

脚本，让

alchemy

服务等待

postgres

准备好接受命令：

alchemy

服务的

Dockerfile

是

FROM python
RUN apt-get update && apt-get install --assume-yes postgresql
RUN pip install sqlalchemy psycopg2
COPY . /alchemy
WORKDIR alchemy
RUN chmod +x wait-for-postgres.sh
CMD ["./wait-for-postgres.sh", "postgres", "python", "apk_tables.py"]

其中我使用的是主机名

postgres

，因为这是与

postgres

Docker映像对应的服务的名称。问题是，如果我

docker compose build

后跟

docker compose up

，我会得到以下日志：

Starting apkapi_postgres_1
Recreating apkapi_alchemy_1
Attaching to apkapi_postgres_1, apkapi_alchemy_1
postgres_1  | LOG:  database system was shut down at 2017-06-26 17:22:32 UTC
alchemy_1   | Password for user postgres: 
postgres_1  | LOG:  MultiXact member wraparound protections are now enabled
alchemy_1   | psql: fe_sendauth: no password supplied
postgres_1  | LOG:  database system is ready to accept connections
alchemy_1   | Postgres is unavailable - sleeping
postgres_1  | LOG:  autovacuum launcher started
alchemy_1   | Password for user postgres: 
alchemy_1   | psql: fe_sendauth: no password supplied
alchemy_1   | Postgres is unavailable - sleeping
alchemy_1   | Password for user postgres: 
alchemy_1   | psql: fe_sendauth: no password supplied
alchemy_1   | Postgres is unavailable - sleeping

这将永远持续下去

---

我怀疑的是

wait for postgres.sh

假设PostgreSQL在本地主机上运行，该主机是可信的，而在其他主机上运行的数据库需要密码。是这样吗？如果是这样，我如何修改脚本以使其使用密码（在本例中，我假设密码是

iperpassword

）？

看起来您只需将密码传递到

psql

命令中，它就能够显示远程主机所需的密码。下面的问题给出了实现这一点的选项：

是的，最后我在

炼金术

服务的

环境

中添加了

PGPASSWORD=iperpassword

行。

Starting apkapi_postgres_1
Recreating apkapi_alchemy_1
Attaching to apkapi_postgres_1, apkapi_alchemy_1
postgres_1  | LOG:  database system was shut down at 2017-06-26 17:22:32 UTC
alchemy_1   | Password for user postgres: 
postgres_1  | LOG:  MultiXact member wraparound protections are now enabled
alchemy_1   | psql: fe_sendauth: no password supplied
postgres_1  | LOG:  database system is ready to accept connections
alchemy_1   | Postgres is unavailable - sleeping
postgres_1  | LOG:  autovacuum launcher started
alchemy_1   | Password for user postgres: 
alchemy_1   | psql: fe_sendauth: no password supplied
alchemy_1   | Postgres is unavailable - sleeping
alchemy_1   | Password for user postgres: 
alchemy_1   | psql: fe_sendauth: no password supplied
alchemy_1   | Postgres is unavailable - sleeping