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在connection timeout設定這個產品中，有1篇Facebook貼文，粉絲數超過2,850的網紅矽谷牛的耕田筆記，也在其Facebook貼文中提到， 關鍵字: GKE, conntrack, HAProxy 影響: 網路重度服務遇見大量錯誤 今天這個案例的重點非常簡單，Kubernetes(GKE) 會根據每個節點上面的記憶體大小去設定相關的 conntrack_max 的數值。因此對於一個小記憶體的節點上運行一個有網路重度的服務，非常容易踩到...

connection timeout設定 在 矽谷牛的耕田筆記 Facebook 的精選貼文

矽谷牛的耕田筆記 By 矽谷牛的耕田筆記

2021-03-06 09:02:31 有 54 人按讚
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關鍵字: GKE, conntrack, HAProxy
影響: 網路重度服務遇見大量錯誤

今天這個案例的重點非常簡單，Kubernetes(GKE) 會根據每個節點上面的記憶體大小去設定相關的 conntrack_max 的數值。因此對於一個小記憶體的節點上運行一個有網路重度的服務，非常容易踩到 conntrack_max 的上限最後導致連線 reset 以及 timeout.

conntrack 是 Linux Kernel 非常重要的網路功能，透過 conntrack (connection tracking) 可以實現非常多的功能，kernel 會去追蹤與監控系統上看到的所有連線，每個連線都包含兩個方向的封包。

根據作者的測試，於 GKE 觀察的結果是大概每 MB 可提升5條 connection的上限。
團隊的應用程式是一個類似於 proxy 的角色，這個應用程式大概每秒要處理一萬個以上的 rquest，而這個現象是當團隊針對整個架構進行一番改正後，開始注意到有網路連線出現問題。

針對這個問題作者提出了幾個解決思路
1. 針對網路連線非常重度的應用程式，將其給配置到比較強力效能的機器人，才可以獲得更高數值的 conntrack_max
2. 透過 init-container/daemonset 等方式，手動執行 sysctl 去修改節點上的 conntrack_max
3. 透過 Prometheus 去監控系統上目前所有節點 conntrack 使用的數量，藉此提醒團隊這個數值也很重要，需要監控
4. 1.15 以後的 kubernetes 有一些小的修復可以幫忙移除一些不合法的 conntrack，勁量讓 conntrack pool 留給有用的連線

https://deploy.live/blog/kubernetes-networking-problems-due-to-the-conntrack/

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矽谷牛的耕田筆記

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目前工作內容主要以 DevOps 為主，本身是微軟 Cloud and Datacenter Management MVP，閒暇之餘會透過文章記錄所學，記錄於 https://www.hwchiu.com. 喜歡參加社群活動來學習不同的經驗，藉此增廣見聞 目前主要參加的社群是 CNTUG，偶而會參加線上 Meetup ，透過網路的方式分享一些心得，並且錄影分享於 Youtube 上
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#85. Solved: Data Connection timeout - Designer - Alteryx ...

If you are running the workflow locally then there is no timeout setting of which I am aware, but if you are running this on a server then ...

#86. Understanding Idle Timeout and Keep Alive Interval settings in ...

The Idle Timeout setting in the TCP profile specifies the length of time that a connection is idle before the connection is eligible for ...

#87. Configure Timeout Setting for Rest Client Element in Call Studio

There are two timeout settings added for Rest Client element: Connect Timeout – The connect timeout interval, in milliseconds. If 0 then an interval.

#88. Setting a Connection time out in Jmeter - Software Quality ...

In this 'HTTP Request Default' there is an option Connect in 'Timeouts (milliseconds)', you can specify your connection timeout value in this ...

#89. php curl timeout handling @ 不大會寫程式 - 隨意窩

... 主要tcp connection 是透過curl 去完成, 所以可以設定的有timeout, ... 這就讓我有點不解了, connection timeout 我很想設成100 ms 之類的, 但在php 內卻無法達成 ...

#90. Setting connection timeout - JSCAPE

Setting connection timeout ... You can use the Sftp#setTimeout method to define the maximum number of milliseconds to wait when establishing a connection to an ...

#91. Change the MySQL timeout on a server - - Rackspace

When an application fails to close an unused connection, a low wait_timeout value helps you ... Be sure to preserve the setting in my.cnf .

#92. How to increase SSH Connection timeout? | DigitalOcean

Hi everyone! I have an issue about SSH connection. Previously I set /etc/ssh/ssh_config as ConnectionTimeout 0 but still closes connection.

#93. KB Article #179773 - Axway Support

Problem. How do you change the connection timeout setting at a domain or instance level when the default setting (30000 ms) is not ...

#94. Setting Custom Feign Client Timeouts | Baeldung

Connection timeout is the time needed for the TCP handshake, while the read timeout needed to read data from the socket. Connection and read ...

#95. How can I change the connection timeout setting in Firefox?

You can change the timeout settings by typing "about:config" in the address bar and then filtering on "timeout": network.http.connection-timeout.

#96. コネクトタイムアウト(connect-timeout ... - Akamai Community

Jun 18, 2018•Knowledge. Loading. Files (0). Related Articles. Knowledge Base #5236 - オリジンサーバの持続接続 (pconn) タイムアウト値の設定について.

#97. Increase the Timeout Setting to for Timeout expired error in ...

Log in to Data Manager · Go to Tools > Settings Configuration > Database Settings · Change connection Timeout value accordingly.