尝试连接到 CloudSQL postgres 时出现 Sqlalchemy / psycopg2 错误

Question

我旋转起来redash使用头盔，GKE与主/节点版本1.12.10-gke.17和istio 1.1.15我使用的数据库中的GCP CLOUDSQL用postgres 9.6

尝试从redash映像 ( 7.0.0.b18042 ) 执行create_db脚本时遇到以下错误

Traceback (most recent call last):
   File "/app/manage.py", line 9, in <module>
     manager()
   File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 716, in __call__
     return self.main(*args, **kwargs)
   File "/usr/local/lib/python2.7/dist-packages/flask/cli.py", line 345, in main
     return AppGroup.main(self, *args, **kwargs)
   File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 696, in main
     rv = self.invoke(ctx)
   File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 1060, in invoke
     return _process_result(sub_ctx.command.invoke(sub_ctx))
   File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 1060, in invoke
     return _process_result(sub_ctx.command.invoke(sub_ctx))
   File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 889, in invoke
     return ctx.invoke(self.callback, **ctx.params)
   File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 534, in invoke
     return callback(*args, **kwargs)
   File "/usr/local/lib/python2.7/dist-packages/click/decorators.py", line 17, in new_func
     return f(get_current_context(), *args, **kwargs)
   File "/usr/local/lib/python2.7/dist-packages/flask/cli.py", line 229, in decorator
     return __ctx.invoke(f, *args, **kwargs)
   File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 534, in invoke
     return callback(*args, **kwargs)
   File "/app/redash/cli/database.py", line 31, in create_tables
     db.create_all()
   File "/usr/local/lib/python2.7/dist-packages/flask_sqlalchemy/__init__.py", line 963, in create_all
     self._execute_for_all_tables(app, bind, 'create_all')
   File "/usr/local/lib/python2.7/dist-packages/flask_sqlalchemy/__init__.py", line 955, in _execute_for_all_tables
     op(bind=self.get_engine(app, bind), **extra)
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/sql/schema.py", line 4005, in create_all
     tables=tables)
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1939, in _run_visitor
     with self._optional_conn_ctx_manager(connection) as conn:
   File "/usr/lib/python2.7/contextlib.py", line 17, in __enter__
     return self.gen.next()
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1932, in _optional_conn_ctx_manager
     with self.contextual_connect() as conn:
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 2123, in contextual_connect
     self._wrap_pool_connect(self.pool.connect, None),
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 2162, in _wrap_pool_connect
     e, dialect, self)
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1476, in _handle_dbapi_exception_noconnection
     exc_info
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/compat.py", line 265, in raise_from_cause
     reraise(type(exception), exception, tb=exc_tb, cause=cause)
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 2158, in _wrap_pool_connect
     return fn()
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 400, in connect
     return _ConnectionFairy._checkout(self)
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 788, in _checkout
     fairy = _ConnectionRecord.checkout(pool)
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 529, in checkout
     rec = pool._do_get()
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 1193, in _do_get
     self._dec_overflow()
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/langhelpers.py", line 66, in __exit__
     compat.reraise(exc_type, exc_value, exc_tb)
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 1190, in _do_get
     return self._create_connection()
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 347, in _create_connection
     return _ConnectionRecord(self)
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 474, in __init__
     self.__connect(first_connect_check=True)
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 671, in __connect
     connection = pool._invoke_creator(self)
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/strategies.py", line 106, in connect
     return dialect.connect(*cargs, **cparams)
   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/default.py", line 412, in connect
     return self.dbapi.connect(*cargs, **cparams)
   File "/usr/local/lib/python2.7/dist-packages/psycopg2/__init__.py", line 130, in connect
     conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
 sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) server closed the connection unexpectedly
    This probably means the server terminated abnormally
    before or while processing the request.
  (Background on this error at: http://sqlalche.me/e/e3q8)

我无法弄清楚是什么导致了这种情况，即是 CloudSQL 的问题，还是某些istio配置错误或其他……

当我执行到容器并尝试手动连接到 CloudSQL 时，会重现相同的错误（具有较小的堆栈跟踪）

>>> import psycopg2
>>> conn = psycopg2.connect(host="192.44.33.1",database="postgres", user="postgres", password="mypass")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/psycopg2/__init__.py", line 130, in connect
    conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError: server closed the connection unexpectedly
    This probably means the server terminated abnormally
    before or while processing the request.

Answer 1

您是否在 Istio 网格中启用了 ServiceEntry 以允许出口流量到 CloudSQL？

apiVersion: networking.istio.io/v1alpha3
kind: ServiceEntry
metadata:
  name: www.googleapis.com
spec:
  hosts:
  - www.googleapis.com
  - oauth2.googleapis.com
  ports:
  - number: 443
    name: https
    protocol: HTTPS
  resolution: DNS
  location: MESH_EXTERNAL

进一步阅读： https : //github.com/istio/istio/issues/6593