DBConnection.ConnectionError) tcp connect (localhost:5432): 连接被拒绝 - :econnrefused答案

【问题标题】：DBConnection.ConnectionError) tcp connect (localhost:5432): connection refused - :econnrefusedDBConnection.ConnectionError) tcp connect (localhost:5432): 连接被拒绝 - :econnrefused
【发布时间】：2017-02-04 09:12:56
【问题描述】：

我正在 Buddy 持续集成服务器上运行构建，当它到达 postgrex/ecto 部分时，它在执行 mix test 时出现错误：

    ==> postgrex
Compiling 61 files (.ex)
Compiling lib/postgrex/protocol.ex (it's taking more than 10s)
Compiling lib/postgrex/default_types.ex (it's taking more than 10s)
Generated postgrex app
==> ecto
Compiling 69 files (.ex)
Compiling lib/ecto/query/builder/lock.ex (it's taking more than 10s)
Compiling lib/ecto/repo/queryable.ex (it's taking more than 10s)
Compiling lib/ecto/query/inspect.ex (it's taking more than 10s)
Compiling lib/mix/tasks/ecto.drop.ex (it's taking more than 10s)
Compiling lib/ecto/query/builder/filter.ex (it's taking more than 10s)
Compiling lib/ecto/repo/preloader.ex (it's taking more than 10s)
Compiling lib/mix/tasks/ecto.gen.repo.ex (it's taking more than 10s)
Compiling lib/ecto/adapters/mysql.ex (it's taking more than 10s)
Compiling lib/ecto/schema.ex (it's taking more than 10s)
Compiling lib/ecto/migration/runner.ex (it's taking more than 10s)
Compiling lib/ecto/repo/schema.ex (it's taking more than 10s)
Compiling lib/ecto/embedded.ex (it's taking more than 10s)
Compiling lib/ecto/migration/schema_migration.ex (it's taking more than 10s)
Compiling lib/ecto/query/builder/preload.ex (it's taking more than 10s)
Compiling lib/ecto/query/builder/order_by.ex (it's taking more than 10s)
Compiling lib/ecto/uuid.ex (it's taking more than 10s)
Compiling lib/ecto/type.ex (it's taking more than 10s)
Compiling lib/ecto/association.ex (it's taking more than 10s)
Compiling lib/ecto/adapters/postgres/connection.ex (it's taking more than 10s)
Compiling lib/mix/tasks/ecto.gen.migration.ex (it's taking more than 10s)
Compiling lib/ecto/query/builder/join.ex (it's taking more than 10s)
Compiling lib/ecto/query/planner.ex (it's taking more than 10s)
Compiling lib/ecto/log_entry.ex (it's taking more than 10s)
Compiling lib/ecto/query/builder/select.ex (it's taking more than 10s)
Compiling lib/ecto/query/builder/distinct.ex (it's taking more than 10s)
Compiling lib/ecto/query/builder/limit_offset.ex (it's taking more than 10s)
Compiling lib/ecto/changeset.ex (it's taking more than 10s)
Compiling lib/ecto/query/builder/group_by.ex (it's taking more than 10s)
Compiling lib/ecto/changeset/relation.ex (it's taking more than 10s)
Compiling lib/ecto/multi.ex (it's taking more than 10s)
Compiling lib/ecto.ex (it's taking more than 10s)
Compiling lib/ecto/query/builder.ex (it's taking more than 10s)
Compiling lib/ecto/adapters/postgres.ex (it's taking more than 10s)
Generated ecto app
==> phoenix_ecto
Compiling 4 files (.ex)
Generated phoenix_ecto app
==> phoenix_chat
Compiling 19 files (.ex)
Generated phoenix_chat app
08:49:48.868 [error] GenServer #PID<0.3296.0> terminating
** (DBConnection.ConnectionError) tcp connect (localhost:5432): connection refused - :econnrefused
    (db_connection) lib/db_connection/connection.ex:148: DBConnection.Connection.connect/2
    (connection) lib/connection.ex:622: Connection.enter_connect/5
    (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
** (Mix) The database for PhoenixChat.Repo couldn't be created: an exception was raised:
    ** (DBConnection.ConnectionError) tcp connect (localhost:5432): connection refused - :econnrefused
        (db_connection) lib/db_connection/connection.ex:148: DBConnection.Connection.connect/2
        (connection) lib/connection.ex:622: Connection.enter_connect/5
        (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
Build failed !!!.

我认为这是因为构建服务器似乎是 (localhost:5432)，而且我认为它与通常在端口 4000 上的 Phoenix 配合得不好。See this answer for my coming to that conclusion.

解决办法是什么？

我将 dev.ex 更改为具有此配置：

config :phoenix_chat, PhoenixChat.Endpoint,
  http: [port: {:system, "PORT"}],

然后我将任务设置为PORT=4000 mix test，但我仍然遇到相同的错误。

编辑：似乎我的端口设置无效，因为错误仍然存在：

PORT=4000 mix test
09:18:34.884 [error] GenServer #PID<0.183.0> terminating
** (DBConnection.ConnectionError) tcp connect (localhost:5432): connection refused - :econnrefused
    (db_connection) lib/db_connection/connection.ex:148: DBConnection.Connection.connect/2
    (connection) lib/connection.ex:622: Connection.enter_connect/5
    (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
** (Mix) The database for PhoenixChat.Repo couldn't be created: an exception was raised:
    ** (DBConnection.ConnectionError) tcp connect (localhost:5432): connection refused - :econnrefused
        (db_connection) lib/db_connection/connection.ex:148: DBConnection.Connection.connect/2
        (connection) lib/connection.ex:622: Connection.enter_connect/5
        (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
Build failed !!!.

所以我现在认为解决方案可能是this。我对添加 ssh 密钥了解不多。

【问题讨论】：

这不是 Phoenix 的 HTTP 端口的问题。这是因为 PostgreSQL 没有在 CI 服务器的 localhost:5432 上运行。如果他们在不同的端口上运行 PostgreSQL，您可能需要在 CI 的某个地方启用它或更改配置。
@Dogbert 将dev.exs 中的配置更改为config :phoenix_chat, PhoenixChat.Repo, adapter: Ecto.Adapters.Postgres, username: "postgres", password: "postgres", database: "phoenix_chat_dev", hostname: "localhost:5432", pool_size: 10 会走上正轨吗？（没有什么区别 - 同样的错误） - 改变的是主机名
这应该是hostname: "localhost", port: 5432, ...，但 5432 是默认值，并且错误说 PostgreSQL not 在 localhost:5432 上运行。你应该找出 PostgreSQL 在 CI 服务器上运行的主机/端口，如果它被默认禁用（例如在 Travis 中，你必须添加一个配置来启用 PostgreSQL：docs.travis-ci.com/user/database-setup/#PostgreSQL）。

标签： postgresql phoenix-framework ecto

【解决方案1】：

我的笔记本电脑崩溃了，并在/usr/local/var/postgres 中留下了一个postmaster.pid 文件。

删除后，我的 postgres 又开始正常工作了。

如果要检查 Postgres 是否正常运行，可以运行pg_isready 来获取输出。您应该得到：/tmp:5432 - accepting connections - 您的端口可能因您的配置而异。

玩得开心！

【讨论】：

如果我们收到/tmp:5432 - no response，我们该如何解决？
啊，我所要做的就是启动我的 postgres

【解决方案2】：

然后尝试brew services stop postgres brew services start postgres。它解决了我的问题

【讨论】：

【解决方案3】：

您可能会看到 libssl/libcrypto 版本的冲突。

brew services start postgres 日志给了我 nada，但手动启动 pg_ctl -D /usr/local/var/postgres start 指向：

/.../openssl/lib/libcrypto.1.0.0.dylib 中缺少定义 _RAND_cleanup

试一试：

brew tap-new $USER/old-openssl
brew extract --version=1.0.2t openssl $USER/old-openssl
brew install openssl@1.0.2t

# and then either brew link openssl@1.0.2t or symlink the required files to current openssl
ln -s /usr/local/Cellar/openssl/openssl@1.0.2t/lib/libcrypto.1.0.0.dylib /usr/local/opt/openssl/lib/libcrypto.1.0.0.dylib
ln -s /usr/local/Cellar/openssl/openssl@1.0.2t/lib/libssl.1.0.0.dylib /usr/local/opt/openssl/lib/libssl.1.0.0.dylib

【讨论】：