2
バックエンドにsqliteを使用していたdjangoサイトを持っています。最近、MySQLにアップグレードし、断続的な 'MySQLサーバーがなくなりました'というエラーが表示されます。サイトを起動した後、正常に読み込まれ、ページをクリックして変更すると、通常1〜6ページを表示した後にエラーが発生します。それが発生したページは無関係であるように見えますが、同じページが初めて正常に読み込まれることがありますが、エラーは2回目にスローされます。Django MySQLサーバーがなくなった
ここに私の環境では
- nginxのリバースプロキシとしてホストマシン上でnginxの内部に、Django 1.8、uwsgi、とPython 3.4を実行している
- ドッカーコンテナを実行しているのです。
- Djangoはmysqlclient dbドライバを使用しています。
- GoogleクラウドのMySQL、第二世代
私はそれは違いはありませんでした、ローカルのMySQLサーバではなく、GoogleクラウドのMySQLを使用してみました。また、mysqlclientの代わりにMySQL Connector/Python DBドライバを使ってみました。それは異なる（ただし同様の）エラーメッセージとトレースバックを生成しました。
私がsqliteに戻ってもうまくいきます。 nginxではなくdjango開発サーバーの下で実行するとうまくいきます。
djangoのCONN_MAX_AGEがMySQLのwait_timeoutより小さくなければならないというこのエラーの記事を見ましたが、デフォルトのCONN_MAX_AGE設定を0にしています.Djangoのドキュメントによれば、これを0（デフォルト）に設定すると、 djangoはリクエストごとに新しいデータベース接続を作成します。 0より大きい値は、接続が開いたままになる期間を定義し、別の要求によって再利用できるようにします。私は0より大きい値に設定すると、エラーは消えますが、永続的な接続が終了した後になるまでエラーを延期するだけです。また、django開発Webサーバは、（CONN_MAX_AGE = 0と同様の）リクエストごとに新しい接続を作成しますが、devサーバを使用してエラーが発生しません。 1.6以前のDjangoのバージョンは永続的な接続をサポートしていなかったので、デフォルトのCONN_MAX_AGE = 0の設定を維持できるはずです。
私はuwsgiのログを有効にする必要がありました、それはエラーログです以下を示しています。すべての助けを事前に
*** Starting uWSGI 2.0.13.1 (64bit) on [Fri Nov 18 22:15:33 2016] ***
compiled with version: 4.8.4 on 18 May 2016 17:48:05
os: Linux-4.4.0-45-generiC#66-Ubuntu SMP Wed Oct 19 14:12:37 UTC 2016
nodename: 083c33814e43
machine: x86_64
clock source: unix
detected number of CPU cores: 8
current working directory:/
detected binary path: /usr/local/bin/uwsgi
!!! no internal routing support, rebuild with pcre support !!!
uWSGI running as root, you can use --uid/--gid/--chroot options
*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***
chdir() to /srv/ftc
your memory page size is 4096 bytes
detected max file descriptor number: 65536
lock engine: pthread robust mutexes
thunder lock: disabled (you can enable it with --thunder-lock)
uwsgi socket 0 bound to UNIX address /srv/ftc/ftc.sock fd 3
Python version: 3.4.3 (default, Oct 14 2015, 20:31:36) [GCC 4.8.4]
Set PythonHome to /srv/env/ftc
*** Python threads support is disabled. You can enable it with --enable-threads ***
Python main interpreter initialized at 0x22a73d0
your server socket listen backlog is limited to 100 connections
your mercy for graceful operations on workers is 60 seconds
mapped 1476189 bytes (1441 KB) for 10 cores
*** Operational MODE: preforking ***
Loading configuration from /srv/ftc/data/settings_local.py
WSGI app 0 (mountpoint='') ready in 2 seconds on interpreter 0x22a73d0 pid: 9 (default app)
*** uWSGI is running in multiple interpreter mode ***
spawned uWSGI master process (pid: 9)
spawned uWSGI worker 1 (pid: 17, cores: 1)
spawned uWSGI worker 2 (pid: 18, cores: 1)
spawned uWSGI worker 3 (pid: 19, cores: 1)
spawned uWSGI worker 4 (pid: 20, cores: 1)
spawned uWSGI worker 5 (pid: 21, cores: 1)
spawned uWSGI worker 6 (pid: 22, cores: 1)
spawned uWSGI worker 7 (pid: 23, cores: 1)
spawned uWSGI worker 8 (pid: 24, cores: 1)
spawned uWSGI worker 9 (pid: 25, cores: 1)
spawned uWSGI worker 10 (pid: 26, cores: 1)
[pid: 21|app: 0|req: 1/1] 192.168.1.15() {38 vars in 637 bytes} [Fri Nov 18 17:15:39 2016] GET /faq/ => generated 13018 bytes in 3021 msecs (HTTP/1.1 200) 8 headers in 412 bytes (1 switches on core 0)
[pid: 21|app: 0|req: 2/2] 192.168.1.15() {40 vars in 707 bytes} [Fri Nov 18 17:16:20 2016] GET /find-local-food/ => generated 20480 bytes in 1510 msecs (HTTP/1.1 200) 7 headers in 290 bytes (2 switches on core 0)
[pid: 21|app: 0|req: 3/3] 192.168.1.15() {40 vars in 711 bytes} [Fri Nov 18 17:16:23 2016] GET /my-programs/ => generated 9297 bytes in 1454 msecs (HTTP/1.1 200) 7 headers in 290 bytes (2 switches on core 0)
[pid: 21|app: 0|req: 4/4] 192.168.1.15() {40 vars in 683 bytes} [Fri Nov 18 17:16:26 2016] GET/=> generated 13562 bytes in 3037 msecs (HTTP/1.1 200) 8 headers in 412 bytes (2 switches on core 0)
[pid: 21|app: 0|req: 5/5] 192.168.1.15() {40 vars in 683 bytes} [Fri Nov 18 17:16:30 2016] GET /about/ => generated 10064 bytes in 1586 msecs (HTTP/1.1 200) 7 headers in 290 bytes (2 switches on core 0)
[pid: 21|app: 0|req: 6/6] 192.168.1.15() {40 vars in 685 bytes} [Fri Nov 18 17:16:33 2016] GET /faq/ => generated 13018 bytes in 1145 msecs (HTTP/1.1 200) 8 headers in 412 bytes (2 switches on core 0)
[pid: 21|app: 0|req: 7/7] 192.168.1.15() {40 vars in 691 bytes} [Fri Nov 18 17:16:35 2016] GET /contact/ => generated 8734 bytes in 1352 msecs (HTTP/1.1 200) 7 headers in 290 bytes (2 switches on core 0)
[pid: 21|app: 0|req: 8/8] 192.168.1.15() {40 vars in 711 bytes} [Fri Nov 18 17:16:38 2016] GET /find-local-food/ => generated 20480 bytes in 1484 msecs (HTTP/1.1 200) 7 headers in 290 bytes (2 switches on core 0)
[pid: 21|app: 0|req: 9/9] 192.168.1.15() {40 vars in 699 bytes} [Fri Nov 18 17:16:41 2016] GET /about/ => generated 10064 bytes in 1723 msecs (HTTP/1.1 200) 7 headers in 290 bytes (2 switches on core 0)
Traceback (most recent call last):
File "/srv/env/ftc/lib/python3.4/site-packages/django/core/urlresolvers.py", line 393, in urlconf_module
return self._urlconf_module
AttributeError: 'RegexURLResolver' object has no attribute '_urlconf_module'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/srv/env/ftc/lib/python3.4/site-packages/django/db/backends/utils.py", line 64, in execute
return self.cursor.execute(sql, params)
File "/srv/env/ftc/lib/python3.4/site-packages/django/db/backends/mysql/base.py", line 124, in execute
return self.cursor.execute(query, args)
File "/srv/env/ftc/lib/python3.4/site-packages/MySQLdb/cursors.py", line 250, in execute
self.errorhandler(self, exc, value)
File "/srv/env/ftc/lib/python3.4/site-packages/MySQLdb/connections.py", line 42, in defaulterrorhandler
raise errorvalue
File "/srv/env/ftc/lib/python3.4/site-packages/MySQLdb/cursors.py", line 247, in execute
res = self._query(query)
File "/srv/env/ftc/lib/python3.4/site-packages/MySQLdb/cursors.py", line 411, in _query
rowcount = self._do_query(q)
File "/srv/env/ftc/lib/python3.4/site-packages/MySQLdb/cursors.py", line 374, in _do_query
db.query(q)
File "/srv/env/ftc/lib/python3.4/site-packages/MySQLdb/connections.py", line 270, in query
_mysql.connection.query(self, query)
_mysql_exceptions.OperationalError: (2006, 'MySQL server has gone away')
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/srv/env/ftc/lib/python3.4/site-packages/django/core/handlers/wsgi.py", line 170, in __call__
self.load_middleware()
File "/srv/env/ftc/lib/python3.4/site-packages/django/core/handlers/base.py", line 52, in load_middleware
mw_instance = mw_class()
File "/srv/env/ftc/lib/python3.4/site-packages/django/middleware/locale.py", line 24, in __init__
for url_pattern in get_resolver(None).url_patterns:
File "/srv/env/ftc/lib/python3.4/site-packages/django/core/urlresolvers.py", line 401, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/srv/env/ftc/lib/python3.4/site-packages/django/core/urlresolvers.py", line 395, in urlconf_module
self._urlconf_module = import_module(self.urlconf_name)
File "/srv/env/ftc/lib/python3.4/importlib/__init__.py", line 109, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
File "<frozen importlib._bootstrap>", line 2226, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked
File "<frozen importlib._bootstrap>", line 1129, in _exec
File "<frozen importlib._bootstrap>", line 1471, in exec_module
File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
File "./ftc/urls.py", line 23, in <module>
url(r'^', include('areas.public.urls')),
File "/srv/env/ftc/lib/python3.4/site-packages/django/conf/urls/__init__.py", line 33, in include
urlconf_module = import_module(urlconf_module)
File "/srv/env/ftc/lib/python3.4/importlib/__init__.py", line 109, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
File "<frozen importlib._bootstrap>", line 2226, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked
File "<frozen importlib._bootstrap>", line 1129, in _exec
File "<frozen importlib._bootstrap>", line 1471, in exec_module
File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
File "./areas/public/urls.py", line 36, in <module>
url(r'^paypal/', include('areas.public.paypal.urls')),
File "/srv/env/ftc/lib/python3.4/site-packages/django/conf/urls/__init__.py", line 33, in include
urlconf_module = import_module(urlconf_module)
File "/srv/env/ftc/lib/python3.4/importlib/__init__.py", line 109, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
File "<frozen importlib._bootstrap>", line 2226, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked
File "<frozen importlib._bootstrap>", line 1129, in _exec
File "<frozen importlib._bootstrap>", line 1471, in exec_module
File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
File "./areas/public/paypal/urls.py", line 5, in <module>
from . import payment_complete
File "./areas/public/paypal/payment_complete.py", line 9, in <module>
PublicCommon = PublicCommon()
File "./areas/public/common/__init__.py", line 34, in __init__
self.login_page = self.get_cms_page('pu_login')
File "./areas/public/common/__init__.py", line 27, in get_cms_page
return get_object_or_404(Page, reverse_id=reverse_id, publisher_is_draft=False)
File "/srv/env/ftc/lib/python3.4/site-packages/django/shortcuts.py", line 155, in get_object_or_404
return queryset.get(*args, **kwargs)
File "/srv/env/ftc/lib/python3.4/site-packages/django/db/models/query.py", line 328, in get
num = len(clone)
File "/srv/env/ftc/lib/python3.4/site-packages/django/db/models/query.py", line 144, in __len__
self._fetch_all()
File "/srv/env/ftc/lib/python3.4/site-packages/django/db/models/query.py", line 965, in _fetch_all
self._result_cache = list(self.iterator())
File "/srv/env/ftc/lib/python3.4/site-packages/django/db/models/query.py", line 238, in iterator
results = compiler.execute_sql()
File "/srv/env/ftc/lib/python3.4/site-packages/django/db/models/sql/compiler.py", line 840, in execute_sql
cursor.execute(sql, params)
File "/srv/env/ftc/lib/python3.4/site-packages/django/db/backends/utils.py", line 79, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "/srv/env/ftc/lib/python3.4/site-packages/django/db/backends/utils.py", line 64, in execute
return self.cursor.execute(sql, params)
File "/srv/env/ftc/lib/python3.4/site-packages/django/db/utils.py", line 98, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/srv/env/ftc/lib/python3.4/site-packages/django/utils/six.py", line 685, in reraise
raise value.with_traceback(tb)
File "/srv/env/ftc/lib/python3.4/site-packages/django/db/backends/utils.py", line 64, in execute
return self.cursor.execute(sql, params)
File "/srv/env/ftc/lib/python3.4/site-packages/django/db/backends/mysql/base.py", line 124, in execute
return self.cursor.execute(query, args)
File "/srv/env/ftc/lib/python3.4/site-packages/MySQLdb/cursors.py", line 250, in execute
self.errorhandler(self, exc, value)
File "/srv/env/ftc/lib/python3.4/site-packages/MySQLdb/connections.py", line 42, in defaulterrorhandler
raise errorvalue
File "/srv/env/ftc/lib/python3.4/site-packages/MySQLdb/cursors.py", line 247, in execute
res = self._query(query)
File "/srv/env/ftc/lib/python3.4/site-packages/MySQLdb/cursors.py", line 411, in _query
rowcount = self._do_query(q)
File "/srv/env/ftc/lib/python3.4/site-packages/MySQLdb/cursors.py", line 374, in _do_query
db.query(q)
File "/srv/env/ftc/lib/python3.4/site-packages/MySQLdb/connections.py", line 270, in query
_mysql.connection.query(self, query)
django.db.utils.OperationalError: (2006, 'MySQL server has gone away')
[pid: 20|app: 0|req: 1/10] 192.168.1.15() {40 vars in 701 bytes} [Fri Nov 18 17:16:43 2016] GET /my-programs/ => generated 0 bytes in 258 msecs (HTTP/1.1 500) 0 headers in 0 bytes (1 switches on core 0)
...brutally killing workers...
worker 1 buried after 1 seconds
worker 2 buried after 1 seconds
worker 3 buried after 1 seconds
worker 4 buried after 1 seconds
worker 5 buried after 1 seconds
worker 6 buried after 1 seconds
worker 7 buried after 1 seconds
worker 8 buried after 1 seconds
worker 9 buried after 1 seconds
worker 10 buried after 1 seconds
binary reloading uWSGI...
chdir() to/
closing all non-uwsgi socket fds > 2 (max_fd = 65536)...
found fd 3 mapped to socket 0 (/srv/ftc/ftc.sock)
running /usr/local/bin/uwsgi
[uWSGI] getting INI configuration from /srv/ftc/conf/uwsgi.ini
ありがとう！
mysqlの最大接続の問題です。8人のワーカーを起動してみてください。またはmysqlの最大接続数を2人以上増やしてみてください。 –
Murali - 応答ありがとうございます。私がuwsgiプロセスを1に設定すると、erorrは消えます。私が2以上に設定した場合、エラーが発生します。私はmysqlのmax_connectionsをチェックし、それは400に設定されています。 –