目前，我想为postgres挂载日志记录文件夹，这样即使在主机重启后，仍然会保留日志记录信息。
我使用以下docker-compose.yml
version: '2'
services:
postgres:
image: postgres:latest
restart: always
environment:
- POSTGRES_USER=postgres
- POSTGRES_PASSWORD=55F4rGFwsXXXXXX
ports:
- "5432:5432"
volumes:
- postgres_data:/var/lib/postgresql/data
- postgres_logs:/logs
# Make Postgres log to a file.
# More on logging with Postgres: https://www.postgresql.org/docs/current/static/runtime-config-logging.html
command: postgres -c logging_collector=on -c log_destination=stderr -c log_directory=/logs
volumes:
postgres_data:
postgres_logs:
但是，我收到以下权限被拒绝错误。
postgres_1 | 2018-02-19 09:03:45.359 UTC [1] LOG: database system is shut down
postgres_1 | 2018-02-19 09:04:45.963 UTC [1] LOG: listening on IPv4 address "0.0.0.0", port 5432
postgres_1 | 2018-02-19 09:04:45.963 UTC [1] LOG: listening on IPv6 address "::", port 5432
postgres_1 | 2018-02-19 09:04:45.965 UTC [1] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
postgres_1 | 2018-02-19 09:04:45.972 UTC [1] FATAL: could not open log file "/logs/postgresql-2018-02-19_090445.log": Permission denied
postgres_1 | 2018-02-19 09:04:45.974 UTC [1] LOG: database system is shut down
postgres_1 | 2018-02-19 09:05:46.741 UTC [1] LOG: listening on IPv4 address "0.0.0.0", port 5432
postgres_1 | 2018-02-19 09:05:46.741 UTC [1] LOG: listening on IPv6 address "::", port 5432
postgres_1 | 2018-02-19 09:05:46.744 UTC [1] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
postgres_1 | 2018-02-19 09:05:46.753 UTC [1] FATAL: could not open log file "/logs/postgresql-2018-02-19_090546.log": Permission denied
postgres_1 | 2018-02-19 09:05:46.755 UTC [1] LOG: database system is shut down
postgres_1 | 2018-02-19 09:06:47.366 UTC [1] LOG: listening on IPv4 address "0.0.0.0", port 5432
postgres_1 | 2018-02-19 09:06:47.366 UTC [1] LOG: listening on IPv6 address "::", port 5432
postgres_1 | 2018-02-19 09:06:47.368 UTC [1] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
postgres_1 | 2018-02-19 09:06:47.375 UTC [1] FATAL: could not open log file "/logs/postgresql-2018-02-19_090647.log": Permission denied
postgres_1 | 2018-02-19 09:06:47.377 UTC [1] LOG: database system is shut down
任何人都知道如何解决此类错误？
答案 0 :(得分：1)
第二次修改
经过一些阅读后，似乎无法以您需要的方式执行此操作。在使用docker-compose声明卷时，您需要能够定义文件所有权，这是docker引擎不支持的。但是您可以考虑一些解决方法，请查看here以获取更多详细信息。
作为一种解决方法，您可以创建一个扩展postgres的Dockerfile并添加：
# ...
RUN mkdir /logs
RUN chown postgres:postgres /logs
修改
经过一些实验，这是有效的：
version: '2'
services:
postgres:
image: postgres:latest
restart: always
environment:
- POSTGRES_USER=postgres
- POSTGRES_PASSWORD=55F4rGFwsXXXXXX
ports:
- "5432:5432"
volumes:
- postgres_data:/var/lib/postgresql/data
- ./:/logs:z
# Make Postgres log to a file.
# More on logging with Postgres: https://www.postgresql.org/docs/current/static/runtime-config-logging.html
command: postgres -c logging_collector=on -c log_destination=stderr -c log_directory=/logs
volumes:
postgres_data:
原始回答
我不小心通过这样做了，首先使用这个docker-compose文件运行docker-compose：
version: '2'
services:
postgres:
image: postgres:latest
restart: always
environment:
- POSTGRES_USER=postgres
- POSTGRES_PASSWORD=55F4rGFwsXXXXXX
ports:
- "5432:5432"
volumes:
- postgres_data:/var/lib/postgresql/data
- postgres_logs:/logs:z
# Make Postgres log to a file.
# More on logging with Postgres: https://www.postgresql.org/docs/current/static/runtime-config-logging.html
command: /bin/bash -c "mkdir -p /logs && chmod -R 777 /logs && postgres -c logging_collector=on -c log_destination=stderr -c log_directory=/logs"
volumes:
postgres_data:
postgres_logs:
这失败了：
postgres_1 | ＆＃34;根＆＃34;执行PostgreSQL服务器不是 允许的。 postgres_1 |服务器必须在a下启动 无特权的用户ID，以防止postgres_1 |可能的系统安全 妥协。请参阅postgres_1的文档更多信息 关于如何正确启动服务器。
将更改恢复为命令并再次运行后工作，但显然这不是一个解决方案，所以坚持上面编辑的答案。
答案 1 :(得分：1)
问题在于主机中的许可权，而不是容器中的许可权。
所以在主机上，
chmod -R 777 postgres_logs