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在ubuntu upgrade這個產品中，有3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， 想必大家一定都有使用過 CPU Limit 的經驗，透過這個機制能夠確保每個 Container 使用的 CPU 資源量，也可以保證每個節點上面會有足夠 CPU 供 Kubernetes 原生服務 (kubelet) 使用。 然而本篇文章就要來跟大家分享一個設定 CPU Limit 反而造成效能更...

ubuntu upgrade 在 矽谷牛的耕田筆記 Facebook 的最佳解答

矽谷牛的耕田筆記 By 矽谷牛的耕田筆記

2020-09-24 09:32:01 有 26 人按讚
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想必大家一定都有使用過 CPU Limit 的經驗，透過這個機制能夠確保每個 Container 使用的 CPU 資源量，也可以保證每個節點上面會有足夠 CPU 供 Kubernetes 原生服務 (kubelet) 使用。

然而本篇文章就要來跟大家分享一個設定 CPU Limit 反而造成效能更差的故事，故事中當 CPU 設定為 800ms 的時候，卻發現實際運行的 Container 最高大概就只有 200ms 左右，這一切的一切都是因為 Liniux Kernel 的臭蟲導致!

一個直接的做法就是針對那些本來就沒有過高 CPU 使用量服務取消其 CPU Limit，作者於文章中也探討了一些機制要如何保護與應對這些被移除 CPU 限制的服務。

這個臭蟲於 Linux Kernel 4.19 後已經修復，但是要注意你使用的發行版本是否有有包含這個修復，作者列出一些已知的發行版本修復狀況

Debian: The latest version buster has the fix, it looks quite recent (august 2020). Some previous version might have get patched.
Ubuntu: The latest version Ubuntu Focal Fosa 20.04 has the fix.
EKS has the fix since December 2019, Upgrade your AMI if necessary.
kops: Since June 2020, kops 1.18+ will start using Ubuntu 20.04 as the default host image.
GKE: THe kernel fix was merged in January 2020. But it does looks like throttling are still happening.

有興趣的歡迎點選原文閱讀更多

https://erickhun.com/posts/kubernetes-faster-services-no-cpu-limits/

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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
工作與閒暇之餘的學習筆記，紀錄各式各樣的科技文章，同時分享自身部落格文章，線上社群演講以及線上課程資訊
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ubuntu upgrade 在 91 敏捷開發之路 Facebook 的最讚貼文

91 敏捷開發之路 By 91 敏捷開發之路

2016-01-13 12:58:27 有 5 人按讚
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#Ansible news

http://www.ithome.com.tw/newstream/103128

今天 Ansible 總算把 2.0 推上主流的 package manager 系統。

Mac 用戶，用 `brew upgrade` 就可以升級到 2.0。

Ubuntu 用戶，如果當初是用 Ansible 官方的 PPA，也可以 `apt-get update` 升上去。

RHEL/CentOS 用戶，因為 EPEL 6/7 都還沒跟上新版，所以，可能要從 pip 管道去做...

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我是 Joey Chen，闖蕩江湖的稱號是 91，熱血點火師，專門燃起大家心裡面的熱情與初衷。 目前為 Odd-e Taiwan 的負責人，同時也是 JetBrains 在台灣的培訓夥伴，至今也仍是熱愛學習與享受各種程式語言之美的 programmer。 身為敏捷教練，擅長 Agile、Scrum、LeSS 等敏捷文化與協作框架的落實與導入，如何讓大家 being agile 而不是 doing agile。同時喜歡結合各家所長，例如 Lean, Kanban 等，重點是持續改善、解決問題、端出成果，而不執著於某種特定方法論或框架。 身為技術教練，我也是極限編程（extreme programming）的狂熱者，我擅長用這些技術與工程實踐來提昇產品的品質、團隊的生產力、降低營運風險，因應市場與公司的商業目標，讓團隊能具有高適應與反應能力的基礎建設。例如 實例化需求、ATDD、BDD、TDD、重構、自動化單元測試/整合測試/驗收測試、CI/CD、code review、pair programming、mob-programming 等等。 同時，我也是推崇 極速開發 的 developer，追求從想法到產品程式碼的完成，中間的時間差能趨近於零，也就是劍隨心轉，想到哪，程式碼就長到哪的境界。從想法到實現中間的等待，其實在實務上佔了很大的 context switch 成本，如果能讓這段時間縮到最短，就能比其他人多嘗試更多種解決方案，進而挑選出最剛好的方案。 同時也是技術社群的活躍份子，從 2010 年開始連任九屆的微軟 MVP，兼任 MSDN 論壇板主，也曾經獲得年度 MSDN 文件庫刊登數量世界第一的榮耀。對微軟技術有愛，對 C# 有愛，對自動測試有愛，對重構與設計模式有愛。近年來對 Java, PHP, Python 也充滿濃厚的興趣，曾帶領客戶團隊中不會寫程式的 QA ，一起用 Python 完成超過百個 mobile UI 自動化測試。 擁有超過十年擔任開發團隊 tech leader, trainer, coach 與 mentor 的經驗，進行的企業內部與公開技術培訓課程已超過 100 場，培訓過的開發人員超過 1000 位，擔任研討會與社群活動的講師次數超過 30 次。 同時也是技術書籍的作者與譯者，與朋友合著的書籍包含《ASP.NET MVC 5：網站開發美學》、《ASP.NET MVC 4 網站開發美學》，翻譯的書籍有《單元測試的藝術-第二版》、《敏捷開發實踐》、《進入IT產業必讀的200個 .NET面試決勝題》。 如果想跟我即時互動，歡迎直接私訊或 email 至 [email protected]。
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ubuntu upgrade 在 車庫一姊 Facebook 的最佳解答

車庫一姊 By 車庫一姊

2015-12-22 00:41:05 有 18 人按讚
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網站暫時是修好了。為什麼會掛點呢，其實源自於我的不用功＋白癡想法。以下是淺薄技術的自言自語：

1. 上上週我發現wordpress不能從後台update成最新版了，我非常幼稚地....以為一定是我太久沒更新，所以版本接不上了...
2. 於是我用ssh連線登入，然後打指令wget最新版本的wordpress, 結果是timeout *20 ....好奇怪。
3. 我又回到後台，心裡想，是不是我一堆Plugin也沒更新？某站網路謠言說，從後台更新Wordpress時最好把Plugin全部deactivate. 所以我照做了。（在這裡我犯了大大大錯，把擋住垃圾留言的plugin也關了，我沒想到，這些留言就自動approve....這樣流進我的資料庫了）
4.然後，我非常無聊地把ubuntu從12.04升級14.04了。（吃飽沒事幹，之後大後悔）
5. 我終於想查查wget為什麼不work? ubuntu網站上說wget之後全面支持SSL, 我才恍然大悟！原來是我security group沒開 443 port! 開了之後，一秒就下載完畢！（抱頭....)然後我解壓縮。
6. 我跑去看garagesister.com發現無法存取Database....(晴天霹靂)
7. 等等，不對，我幹嘛wget, 我腦海中突然響起ubuntu指令：apt-get upgrade wordpress （跪了～～）
8. 正要打指令的時候，我開始想，到底出了啥事？又跑去下指令看mysql怎麼回事了，這時候socket fail....(中間又搞了十幾分鐘）乾脆重啟Mysql.
9. 網站回來了。高興之中登入後台，十幾秒wordpress就升到最新版了，好哀怨，我其實只要做5這件事情不就順利升級嗎？
10. 刪掉了跟目錄底下無用的wordpress檔案。
11.我終於發現真相了，就在3.我停掉垃圾留言Plugin時，有超過2000筆垃圾留言瞬間被寫入，然後我資料庫就掛點了。

接下來有空就要清理這些Spam留言了。

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為什麼會取這個怪名：就是以前在一個車庫大小的地方開過公司，然後有點年紀風韻猶存，所以自稱一姊，組合起來就是車庫一姊囉 東協解密專題 https://vocus.cc/5a12024feceaed97b402054a/home 個人部落格『我是車庫一姊』： https://www.garagesister.com/
Don't wait for things to get better. Improve it.
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社群媒體上有些相關的討論：

ubuntu upgrade 在 Exit 1 when upgrading to Ubuntu 21.04 #6942 - GitHub 的推薦與評價

Windows Build Number Microsoft Windows [Version 10.0.19043.985] WSL Version WSL 2 WSL 1 Kernel Version Linux version ... ... <看更多>

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#65. Upgrading a webserver from Ubuntu 16.04 to 18.04 Bionic ...

In this article we go through the steps you need to take to upgrade a web server (LAMP or LEMP) to the new Ubuntu 18.04 Bionic Beaver.

#66. [memo] 常用ubuntu 升級套件指令/ ubuntu upgrade commands

[memo] 常用ubuntu 升級套件指令/ ubuntu upgrade commands. 2019/09/20 by Monster. # 更新 apt update. # 列出可upgrade 的package apt list –upgradable.

#67. ​How to upgrade to Ubuntu Linux 18.04 | ZDNet

Open the "Software & Updates" setting in System Settings. · Select the third tab, called "Updates." · Set the "Notify me of a new Ubuntu version" ...

#68. How to upgrade to Ubuntu 20.04 LTS “Focal Fossa” - FOSS ...

In this tutorial, we will give you a step-by-step procedure of upgrading from Ubuntu 19.10 or Ubuntu 18.04/18.10 to Ubuntu 20.04 LTS.

#69. How To Upgrade from Ubuntu 20.04 To Ubuntu 22.04

However, users of Ubuntu 20.04 are able to upgrade to this latest release right now. Jammy Jellyfish offers flavors for both ARM64 (AArch64) and ...

#70. How do you Upgrade Ubuntu from an ISO Image By Mounting ...

I'm trying to upgrade 9.10 without burning the ISO image to a disk. What are the steps to get this to work? I am using the Ubuntu-9.10-desktop-amd64.iso ...

#71. How To Upgrade Ubuntu 18.04 LTS to 20.04 LTS Using ...

2 hours time or more. 5GB free disk space or more. Stable internet access. · 1) Do the upgrade command lines below. 2) Watch patiently your ...

#72. How To Upgrade Apache Version in Ubuntu - Ubiq BI

It is very easy to update your Apache web server to the latest version of Apache. Here's how to upgrade Apache version in Ubuntu, ...

#73. Central Server Ubuntu 14.04 to 18.04 In-place Upgrade. - NIIS ...

This document describes the steps required for upgrading Central Server host from Ubuntu 14.04 LTS host to Ubuntu 18.04 LTS.

#74. How to Update Ubuntu Linux - Vultr.com

How to Update Ubuntu Linux · Introduction. It is a best practice to update your server on a regular schedule for security and stability. · Make a ...

#75. How to upgrade to Ubuntu 20.10 in WSL on Windows 10

How to install Ubuntu 20.10 Groovy Gorilla on WSL · In the terminal, first enter sudo su to get root access. · Next, enter nano /etc/update- ...

#76. Should You Upgrade To Ubuntu 16.04 From Ubuntu 14.04

Ubuntu 14.04 LTS has reached the end of its support cycle. You should update to either the 16.04 or 18.04 LTS release.

#77. How To Upgrade Ubuntu 18.04 Or 19.10 To Ubuntu 20.04 LTS?

1. Configure Settings And Internet Connection ... Search for the “Software & Updates” from Activities in the top left corner of your screen or ...

#78. Ubuntu Server message says packages can be updated, but ...

In order to install packages kept back you have to run: sudo apt-get update && sudo apt-get dist-upgrade. Trying to run just sudo apt-get update && sudo ...

#79. How to Update Ubuntu Linux: 6 Steps (with Pictures) - wikiHow

#80. Upgrading to Ubuntu 21.04 Is Not a Good Idea Right Now

Last week, Canonical released Ubuntu 21.04, which as usual results in a rush of upgrades from the previous version. However, Ubuntu users ...

#81. Ubuntu™ Self Upgrade Procedures - Thermo Fisher Scientific

The procedure that is described in this document allows you to upgrade an Ion Torrent™ Server that runs the Ubuntu™ 14.04 operating.

#82. How to Upgrade Ubuntu Server to 20.04 from 18.04 - Linux ...

Step 1: Update your system · Step 2: Configure Update Manager · Step 3: Upgrade Ubuntu server to a new LTS version · Upgrading Ubuntu server over SSH connection?

#83. Install Docker Engine on Ubuntu

Some users download the DEB package and install it manually and manage upgrades completely manually. This is useful in situations ...

#84. "Packages can be updated" - How to update Ubuntu in terminal

You will be shown a list of upgrades. Press y for yes and then press Enter. The apt-get upgrade command will normally only install updates or ...

#85. Update OpenSSL on Ubuntu - - Rackspace

Update OpenSSL on Ubuntu ... OpenSSL is an open-source toolkit for Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols, as ...

#86. Upgrading Ubuntu OS on Enterprise Agents - ThousandEyes ...

Upgrade Procedure. In most cases, customers can upgrade from Ubuntu 14.04 LTS or 16.04 LTS by first ...

#87. Upgrade Ubuntu Kernel Using Command Line - 佛祖球球

Step 1. Make a backup. 在升級之前，記得確認自己的版本並備份。 ; 查詢Ubuntu 版本lsb_release -a. Copy. Step 2. Upgrade all installed packages.

#88. Ubuntu入門系統更新指令(apt-get) - 雜七雜八的小筆記!

步驟：(前提是您的Linux要連上網際網路，以及取得root權限，以下sudo指令就是用來取得root權限的!) 指令一：sudo apt-get update. 說明：用來取得遠端更新 ...

#89. How To Upgrade To Ubuntu 20.04 LTS Server - OSTechNix

This step by step guide will show you how to upgrade to Ubuntu 20.04 LTS server from Ubuntu 18.04 LTS or Ubuntu 19.10 with screenshots.

#90. You can now safely upgrade to Ubuntu 21.04 - Techzim

New operating system versions tend to have issues at launch, Ubuntu 21.04 had its issues but now looks safe for users who want to upgrade.

#91. Ubuntu 的apt-get 用upgrade 還是dist-upgrade 好? - 阿舍的 ...

所以，阿舍是建議，如果你用的是Ubuntu Desktop 的話，那麼升級時，用apt-get dist-upgrade 可能會比較省事和安全，但是，如果你用的是Ubuntu Server 而且 ...

#92. How to Install, Update & Upgrade Ubuntu: A Tutorial for Newbie

There are two ways that will help you Upgrade Ubuntu. These are Terminal Method and Ubuntu Upgrade Manager Tool. When you will Upgrade Ubuntu, your third-party ...

#93. [ubuntu] apt-get update、upgrade 與dist-upgrade 差別

update 更新我們的套件清單 /etc/apt/sources.list，這樣在我們更新時才能比對最新的套件清單，決定是否更新. upgrade

#94. How do I upgrade Ubuntu to a specific version? - OS Today

How do I update Ubuntu from terminal to latest version? · Open the terminal application. · For remote server use the ssh command to login (e.g. ssh user@server- ...

#95. How To Upgrade Existing WSL/WSL2 Ubuntu 18.04 to 20.04

The best way to upgrade to the latest is by upgrading the existing Ubuntu version. Assuming you have 18.04 LTS Ubuntu installed with WSL or WSL2 ...

#96. How to Upgrade Ubuntu 18.04 to Ubuntu 20.04 LTS - TecAdmin

Upgrade Ubuntu 18.04 to Ubuntu 20.04 LTS. Steps to upgrade Ubuntu server and desktop editions. Upgrading Ubuntu to 20.04 LTS.