###### tags: `Linux`, `SRE`
# SRE 讀書會 Round 4 #15 - 線上讀書會共筆

## 活動資訊

* Date: [%DATETIME%] (四) 20:00 - 21:30
* [導讀進度表](https://docs.google.com/spreadsheets/d/1Lgti3mILkvwxyzklX1vvLraaGD-7ePK9rkmlulfOknE/edit#gid=0)
* [導讀 Guideline](https://study-area.sre.tw/GuideLine/)
* Github: [study-area-docs](https://github.com/cross-community/study-area-docs)
[TOC]

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# 現場共筆

## 46 | 案例篇：為什麼應用容器化後，啟動慢了很多？ - 一格


> Q1. 講師的機器無法OOM sitution情況與課程中的情況不同?
> A1.

> Q2. JAVA容器化是否有相關經驗可以分享?
> A2. [SDKMan](https://rickhw.github.io/2019/04/07/Coding/Java-Version-Manager/)

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## 47 | 案例篇：服務器總是時不時丟包，我該怎麼辦？（上） - Jerry Cheng

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## 48 | 案例篇：服務器總是時不時丟包，我該怎麼辦？（下） - John

iptable: 可以看conntrack查看連接數
最常發生問題的地方是rule，

k8s lb也是用iptable
[k8s - User space proxy mode](https://kubernetes.io/docs/concepts/services-networking/service/#proxy-mode-userspace)


[curl - man page](http://www.ipgp.fr/~arnaudl/NanoCD/software/win32/curl/docs/curl.html)
-m/--max-time <seconds>

Maximum time in seconds that you allow the whole operation to take. This is useful for preventing your batch jobs from hanging for hours due to slow networks or links going down. See also the --connect-timeout option.

If this option is used several times, the last one will be used.

多網卡 netstat

[iptable] (https://www.slideshare.net/hongweiqiu/iptables-introduction)

>linux tool:
> * traceroute
> * tracepath
> 協定 :

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# 參考資料
https://applezulab.netdpi.net/network/sctp_introduction/4-path-mtu-discovery
PMTU探索（Path MTU discovery）

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# 活動FB

[社群FB活動貼文 : Round 4 #15](https://www.facebook.com/groups/sre.taiwan/permalink/1865670276932201/)