In this post we’ll show an example on how to implement transfer rate limitation in Nginx. As this limitation is User agent based, itwould be especially meaningful for a download site, or a mirror site like mirror.centos.org.
» Read more: Nginx: UserAgent based transfer rate limit
Archive for the ‘System Tuning’ category
Nginx: UserAgent based transfer rate limit
January 28th, 2010Dell PE2950 LCD Message explained
January 22nd, 2010Dell PowerEdge 2950 control dashboard LCD provides status messages to signify when its physical system is operating well or when needs some attention. The LCD lights blue to indicate a normal operating condition, and lights amber to indicate an error condition.
The LCD scrolls a message that includes a status code followed by descriptive text. The following section lists the LCD status messages that can occur and the probable cause for each message. » Read more: Dell PE2950 LCD Message explained
Rename a Vserver step by step
January 6th, 2010Suppose you made a mistake on the Vserver name when creating it. After finished the installation, you might want to rename your Vserver. This can be accomplished by renaming the config directory and the root for the vserver in question, then modifying some symlinks to match. » Read more: Rename a Vserver step by step
Update CentOS 4 to CentOS 5 remotely
December 31st, 2009I just successfully updated my Dell PowerEdge 1850 from CentOS 4.8 to CentOS 5.4, luckily the issues I faced were not so rare. The steps I used are listed below, may it helpful for you as well! Although this post is mainly intended for CentOS it should work on RHEL systems as well.
Before you start, A word of advice i believe most experienced RHEL/CentOS users will show you regarding what you’re thinking:
Upgrade between minor versions (i.e. CentOS 5.2 -> 5.3 -> 5.4, or even 5.0 -> 5.4) YES
Upgrade between major system versions (i.e. CentOS 4.8 to CentOS 5.4) NO » Read more: Update CentOS 4 to CentOS 5 remotely
Failover Firewalls with OpenBSD and CARP
December 30th, 2009Warning – this post was original created by Jason Dixon some yrs ago, its copyright is fully held by samag.com. I copied it here for a track record, If there’s any issue, please let me know. As the pictures in this post had lost already, it’s suggested to check its PDF version here.
Firewalls are a required component in commercial and residential computer networks. For many installations, the firewall is a single point of failure between client systems and external resources. It can also become a liability when hardware or applications fail, leaving potential customers unable to reach your servers. » Read more: Failover Firewalls with OpenBSD and CARP
Set timezone date and time in Linux
December 13th, 2009Your computer has two timepieces; a battery-backed one that is always running (a.k.a. the hardware, BIOS, or CMOS clock), and another that is maintained by the operating system currently running, it’s called system clock. This document explains how to set your system clock, your timezone, and other stuff related to how linux does its time-keeping. » Read more: Set timezone date and time in Linux
Postfix: Manage transport mapping table
December 9th, 2009I have some web servers running for productive purpose, and they all have to send out mails. So a problem comes, how can I config mail forwardings for these servers with only internal network to send out mails to the public network?
Luckily it’s easy to implement with the help of either sendmail or postfix, the two most common MTAs in Linux world. » Read more: Postfix: Manage transport mapping table
Antispam: Understanding SPF records
December 5th, 2009Email is an extremely powerful and valuable tool for netizen, but only when used in the right way. As such we fully support measures that aim to defend users from unwanted emails.
One way to do this is by participating in the Sender Policy Framework (SPF), which is an open standard method of allowing the senders of emails to verify that they are who they say they are. This is important as most abuse of emails (spam) is generated by people using false addresses. » Read more: Antispam: Understanding SPF records
13th Workshop on High Performance Transaction Systems
November 25th, 2009The 13th international workshop on HPTS held at October 25-28, 2009, Pacific Grove, CA. It’s all about real systems problems for real systems builders! The papers are listed at its official website. These papers are really really very informative, it’s suggested to have a read!
Every two years, HPTS brings together a lively and opinionated group of participants to discuss and debate the pressing topics that affect today’s systems and their design and implementation. » Read more: 13th Workshop on High Performance Transaction Systems
Install Dell OMSA on Redhat Enterprise Linux
November 19th, 2009Here we listed 3 ways on the installation of Dell OpenManage Server Administrator on a Redhat Enterprise Linux, you can follows these steps on CentOS or SLES 10, they would work well.
1, Install from RPM packages
Generally we need these RPM packages, you can search and download them from Google.com.
» Read more: Install Dell OMSA on Redhat Enterprise Linux