The Book of Postfix by Ralf Hildebrandt and Patrick Koetter
Anyone who has tried to run an e-mail server knows that mail isn't a polite relay race any more. It's a game of smash-mouth football. Nine out of ten times someone opens an SMTP connection to you, it's not with something you want. And as if coping with spammers, viruses and other people's misconfigured mail software wasn't enough, now e-mail is a mission-critical company IT service and is expected to plug in to the LDAP directory. We can't blame you if you decide to outsource mail entirely.
If you do decide to stay on as postmaster@ and fight it out, whatever you do, don't try it with one of last decade's mail books. Although any of the current mail servers, correctly configured, can put up a good fight against the spammers and other bad people, The Book of Postfix by itself is a good reason to make Postfix your mail server of choice. Look here for a good explanation of the SMTP protocol, essential for any mail admin, along with enough detail on the architecture of Postfix to help you really understand the config files. It also offers real-world advice for putting together a mail server setup that is reliable in the face of the spam and virus blitz.
Postfix offers you a lot of choice in where to add filters, sanity checks and other protective countermeasures to your mail server. For example, do you want to set up a content_filter or an smtpd_proxy_filter? Besides offering a cookbook for each solution, The Book of Postfix helps you consider the pros and cons of each feature you're considering. A helpful plus is diagrams illustrating where exactly countermeasures fit into the Postfix architecture.
Postfix is complicated enough on its own, as it divides functionality among multiple processes for security. In order to add spam-fighting tools and have everything work, you need a good understanding of what plugs in to what and how, and this book is a great way to get it.
Downloadable scripts and errata, some of which could save you a late night of troubleshooting, are available at www.postfix-book.com.
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
- 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)
- Parsing an RSS News Feed with a Bash Script
- Google's SwiftShader Released
- Doing for User Space What We Did for Kernel Space
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