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+0  Change IP on-the-fly for Single NIC Linux host

Tag: Technology | Linux | network | networking
Terry 发于 2014年06月19日 15:00 | 点击: 1985 | 展开摘要
Scenario:

Linux hosts or VMs with 1 single NIC

IP address of the interface needs to be changed to a new address in the same network (not as a secondary IP or alias).

In this case we use ip command from iproute2 rather than ifconfig from

查看全文: http://www.udpwork.com/item/12761.html

+0  JiMetrics now gathers SQL Server startup account

Tag: PowerShell | SQLServer | Technology | Windows
Haidong Ji 发于 2014年06月17日 09:26 | 点击: 2096 | 展开摘要
During the last few days, I’ve refactored JiMetrics and added a new function:

Used Pester to create more test cases for PowerShell functions I wrote;

Enhanced the design and code so JiMetrics also gathers SQL Server instance’s

查看全文: http://www.udpwork.com/item/12637.html

+0  Toggle promisc mode of NICs on Linux

Tag: Technology | Linux | network | networking
Terry 发于 2014年06月16日 12:00 | 点击: 1489 | 展开摘要
简单说,网卡的 promisc 模式(硬要翻译成中文的话,是混杂模式?)会导致网络控制器将该网络上所有的数据包发送给 CPU 不开启的话网络控制器只接收以它为目的地的包。通常用于嗅探或虚拟化环境中。

Promiscuous mode

A mode for a wired network interface controller (NIC) or wireless network interface controller (WNIC) that causes the con

查看全文: http://www.udpwork.com/item/12704.html

+0  VirtualBox 导致 Linux 桌面环境下无法复制粘贴

Tag: Technology | gnome | IT | Linux | VirtualBox
Terry 发于 2014年06月12日 14:00 | 点击: 2270 | 展开摘要
两台 Optiplex 9020 工作站中的一台,跑的是 Linux 3.11 + GNOME 3.4 + Compiz 桌面环境,因为是干活用的,只求稳定不出问题所以平时很少折腾,最近一次重启都是3个月前的事了。

发现昨天 Chrome 升级到 35.0.1916.153 之后突然无法 copy & paste 了,起初以为是 Chrome 的问题。然后测试了一下发现整个桌面环境下各种应用程序中都无法复制粘贴了,这下才意识到问题大了,可能要重启。

决定重启之前,

查看全文: http://www.udpwork.com/item/12633.html

+0  Playing with kpatch on Ubuntu

Tag: Technology | kernel | kgraft | kpatch | ksplice | Linux
Terry 发于 2014年05月21日 10:00 | 点击: 2341 | 展开摘要
Dynamic / Live kernel patching

I have been using Ksplice on Ubuntu / Ubuntu Server since 2011 after Oracle acquired Ksplice. It’s great technology and tool to minimize downtime and maximize server uptime, especially to those servers

查看全文: http://www.udpwork.com/item/12278.html

+0  CVE-2014-0196

Tag: Technology | kernel | Linux | security
Terry 发于 2014年05月13日 18:00 | 点击: 2508 | 展开摘要
简单说,这是一个存在了5年,从 Linux 2.6.31-rc3 起便存在的本地代码执行漏洞,导致问题,攻击者会获取 root shell 直到今年5月3日才被修复。

CVE-2014-0196

A race condition in the pty (pseudo terminal) layer (writer buffer handling), which could be used by attackers to corrupt kernel memory and

查看全文: http://www.udpwork.com/item/12256.html

+0  Speaking at SQLSaturday Chicago

Tag: Technology
Haidong Ji 发于 2014年04月22日 21:32 | 点击: 1119 | 展开摘要
I will deliver a session for SQLSaturday this coming Saturday, April 26th. I will be discussing “Big Data”: cloud computing, distributed computing, column-store databases, in-memory OLTP databases, Hadoop, machine learning, and

查看全文: http://www.udpwork.com/item/12160.html

+0  Removing duplicate rows in small batches based on date column

Tag: SQLServer | Technology
Haidong Ji 发于 2014年04月08日 12:19 | 点击: 4700 | 展开摘要
Due to double scheduling, some duplicate rows were inserted into the Windows.TableStats table in JiMetrics. To confirm that the table has duplicates, here is the T-SQL script I used. Note that this same script should work in all other major

查看全文: http://www.udpwork.com/item/12099.html

+0  Linux 3.14

Tag: Technology | kernel | Linux
Terry 发于 2014年04月01日 04:01 | 点击: 2286 | 展开摘要
工作重心转向 Linux 内核及 mainline 中的虚拟化技术,所以会持续关注内核的发展 :-D

Linux 3.14 于3月30日发布,澳洲时间是3月份的最后一天,囧

3.14 中的显著特性:

添加了 Deadline scheduling 调度器

在 SCHED_FIFO 先进先出和 SCHED_RR round-robin 循环的基础上添加了 SCHED_DEADLINE 以便于更有效地处理 real-time 任务。有别于传统进程优先级的概念 deadli

查看全文: http://www.udpwork.com/item/12100.html

+0  WordPress post update services and Nginx upstream time out

Tag: Linux | Technology | Web
Haidong Ji 发于 2014年03月18日 03:58 | 点击: 4213 | 展开摘要
Starting around last Friday, I think, this site became irresponsive. Checking Tengine/Nginx error logs, here is a sample of what I saw:

2014/03/xx 08:43:40 [error] 3837#0: *6149 connect() to unix:/var/run/php-fastcgi/php-fastcgi.socket fai

查看全文: http://www.udpwork.com/item/11965.html

+0  Collecting Windows BIOS and Host Serial Number

Tag: PowerShell | SQLServer | Technology | Windows
Haidong Ji 发于 2014年02月21日 09:38 | 点击: 2225 | 展开摘要
After imporving JiMetrics yesterday so it tries to determine if the host is a VM or not, I made another improvement today: collecting host server BIOS related information and serial number.

I don’t know about you, in the past when I

查看全文: http://www.udpwork.com/item/11752.html

+0  Determining if a Windows host is a VM in JiMetrics

Tag: PowerShell | SQLServer | Technology | Windows
Haidong Ji 发于 2014年02月20日 12:34 | 点击: 3644 | 展开摘要
I’ve been using my own SQL Server metrics collection package called JiMetrics for a couple of years. It is easy to set up. All you need are just two things: SQL Server instance and an account that has admin access to both the servers

查看全文: http://www.udpwork.com/item/11748.html
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