docker compose psql无法连接到服务器

Question

我使用docker查看了瓶装水的github MD文件，遇到了一个关于postgresql的问题

如果我运行docker compose run--rm postgres psql我会得到错误

/usr/local/lib/python2.7/dist-packages/requests/packages/urllib3/util/ssl_.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
/usr/local/lib/python2.7/dist-packages/requests/packages/urllib3/util/ssl_.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
/usr/local/lib/python2.7/dist-packages/requests/packages/urllib3/util/ssl_.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
/usr/local/lib/python2.7/dist-packages/requests/packages/urllib3/util/ssl_.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
psql: could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

这是我的docker compose中postgres和psql的配置。yml文件

postgres:
   build: ./tmp
   dockerfile: Dockerfile.postgres
   hostname: postgres
   ports:
     - '45432:5432' 

psql:
  image: postgres:9.4
  links:
    - postgres
  command: 'sh -c ''exec psql -h "localhost" -p "5432" -U postgres'''

这是我的pg_hba。配置文件

local   all             postgres                                peer

# TYPE  DATABASE        USER            ADDRESS                 METHOD

# "local" is for Unix domain socket connections only
local   all             all                                     trust
# IPv4 local connections:
host    all             all             127.0.0.1/32            md5
# IPv6 local connections:
host    all             all             ::1/128                 md5
# Allow replication connections from localhost, by a user with the
# replication privilege.
#local   replication     postgres                                peer
#host    replication     postgres        127.0.0.1/32            md5
#host    replication     postgres        ::1/128                 md5

我已经做了好几天了，任何形式的帮助都将不胜感激！非常感谢。

Answer 1

这是docker comment的一个记录很少的特性，因为它也让我措手不及。它在留档中。看看你能不能找到它。

当两个容器链接时，它们使用虚拟主机名链接。如果您检查/etc/hosts您的psqlconainer，您将找到一行别名postgres{foldername}\u postgres_1，其中{foldername}是docker compose项目的父文件夹的名称。

要使用链接容器，请使用主机名postgres。

对于你的例子：

psql:
  image: postgres:9.4
  links:
    - postgres
  command: 'sh -c ''exec psql -h "postgres" -p "5432" -U postgres'''

您也可以配置您的代码库来使用它。如果您想在链接容器之外运行代码，只需修改host/etc/host文件以指向所需的服务。