IP Bandwidth Management
In our setup, we have two virtual web servers on a single Linux machine. The setup script (Listing 1) includes some commented sample IP-aliasing examples using the supplied ip utility. The ip utility is feature-loaded and not in the scope of this article. IP addresses 10.0.0.10 and 10.0.0.11 are attached (aliased on) to device eth0 in the example.
To test, use ftp to get to another machine on the network. First, use ftp to get to IP address 10.0.0.10, where you should observe a rate of approximately 1Mbps. Quit that ftp session and start another one to 10.0.0.11, where you should observe a throughput of approximately 3Mbps.
These are very exciting times for Linux. As far as I know, Linux is the most sophisticated QoS-enabled OS available today. The closest second is probably BSD's ALTQ, which lags quite a bit behind the sophistication, flexibility and extensibility found in Linux TC. I am not aware of any such functionality in Microsoft products (perhaps someone could provide pointers if they exist). Sun Solaris does have a CBQ and RSVP combo they sell as a separate product. I predict a huge increase in the use of Linux servers as a result of the many features available with TC. Alexey has taken Linux to a new level.
Support for the IETF diffserv features is also in Linux. The work extends the TC to add the most flexible diffserv support known today. Diffserv support was made possible through efforts by Werner Almesberger (who also wrote LILO, Linux-ATM and more) and myself. For more details, see http://lrcwww.epfl.ch/linux-diffserv/.
All listings referred to in this article are available by anonymous download in the file ftp.linuxjournal.com/pub/lj/listings/issue62/3369.tgz.
Jamal Hadi Salim (firstname.lastname@example.org) is a hacker wannabe. He spends a fair amount of his spare time staring at Linux networking code. Jamal was the original author of the Sendmail-UUCP HOWTO and is the CASIO digital diary serial driver/application author, which he still maintains. He also has sent the occasional patches to many things, including the kernel, biased towards networking issues. Currently, his efforts are focused mainly in the network scheduling code where he co-authored the Linux diffserv code with Werner Almesberger.
Practical Task Scheduling Deployment
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
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|The Firebird Project's Firebird Relational Database||Jul 29, 2016|
|Stunnel Security for Oracle||Jul 28, 2016|
|SUSE LLC's SUSE Manager||Jul 21, 2016|
|My +1 Sword of Productivity||Jul 20, 2016|
|Non-Linux FOSS: Caffeine!||Jul 19, 2016|
|Murat Yener and Onur Dundar's Expert Android Studio (Wrox)||Jul 18, 2016|
- The Firebird Project's Firebird Relational Database
- Stunnel Security for Oracle
- My +1 Sword of Productivity
- Non-Linux FOSS: Caffeine!
- SUSE LLC's SUSE Manager
- Managing Linux Using Puppet
- Murat Yener and Onur Dundar's Expert Android Studio (Wrox)
- Doing for User Space What We Did for Kernel Space
- Google's SwiftShader Released
- SuperTuxKart 0.9.2 Released
With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide