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Ruby 1.8.7, rails 3.0.1 应用程序运行良好一年多，一周没有更新。但是，突然转到应用程序返回 503 错误。数据库连接在另一个 Linode 上 - 它运行良好，我可以从问题服务器手动连接到 mysql db，这就是 nginx 访问日志所说的：

2012/06/30 03:20:00 [error] 2277#0: *509 connect() to unix:/passenger_helper_server failed (11: Resource temporarily unavailable) while connecting to upstream, client: 192.168.255.12, server: disco, request: "GET / HTTP/1.1", upstream: "passenger:unix:/passenger_helper_server:", host: "*.*.*.*"
2012/06/30 03:20:12 [error] 2277#0: *511 connect() to unix:/passenger_helper_server failed (11: Resource temporarily unavailable) while connecting to upstream, client: 192.168.255.12, server: disco, request: "GET / HTTP/1.1", upstream: "passenger:unix:/passenger_helper_server:", host: "*.*.*.*"
2012/06/30 03:20:24 [error] 2277#0: *513 connect() to unix:/passenger_helper_server failed (11: Resource temporarily unavailable) while connecting to upstream, client: 192.168.255.12, server: disco, request: "GET / HTTP/1.1", upstream: "passenger:unix:/passenger_helper_server:", host: "*.*.*.*"
2012/06/30 03:20:36 [error] 2277#0: *515 connect() to unix:/passenger_helper_server failed (11: Resource temporarily unavailable) while connecting to upstream, client: 192.168.255.12, server: disco, request: "GET / HTTP/1.1", upstream: "passenger:unix:/passenger_helper_server:", host: "*.*.*.*"
2012/06/30 03:20:48 [error] 2277#0: *517 connect() to unix:/passenger_helper_server failed (11: Resource temporarily unavailable) while connecting to upstream, client: 192.168.255.12, server: disco, request: "GET / HTTP/1.1", upstream: "passenger:unix:/passenger_helper_server:", host: "*.*.*.*"
2012/06/30 03:21:00 [error] 2277#0: *519 connect() to unix:/passenger_helper_server failed (11: Resource temporarily unavailable) while connecting to upstream, client: 192.168.255.12, server: disco, request: "GET / HTTP/1.1", upstream: "passenger:unix:/passenger_helper_server:", host: "*.*.*.*"
2012/06/30 03:21:12 [error] 2277#0: *521 connect() to unix:/passenger_helper_server failed (11: Resource temporarily unavailable) while connecting to upstream, client: 192.168.255.12, server: disco, request: "GET / HTTP/1.1", upstream: "passenger:unix:/passenger_helper_server:", host: "*.*.*.*"
2012/06/30 03:21:24 [error] 2277#0: *523 connect() to unix:/passenger_helper_server failed (11: Resource temporarily unavailable) while connecting to upstream, client: 192.168.255.12, server: disco, request: "GET / HTTP/1.1", upstream: "passenger:unix:/passenger_helper_server:", host: "*.*.*.*"
2012/06/30 03:21:35 [error] 2277#0: *525 connect() to unix:/passenger_helper_server failed (11: Resource temporarily unavailable) while connecting to upstream, client: 192.168.255.12, server: disco, request: "GET / HTTP/1.1", upstream: "passenger:unix:/passenger_helper_server:", host: "*.*.*.*"

Linode 说一切都运行良好 - 有什么想法可以为我指明正确的方向吗？

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OK looks like there was an Amazon outage which took down our redis database:

http://www.theregister.co.uk/2012/06/30/amazon_cloud_storm_outage/

于 2012-06-30T23:38:02.633 回答