Ubuntu For Dummies

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Sending Bulk Emails On A Budget

Ubuntu Server and Postfix produce aquitereputable, light-weight and flexiblecombination for sending bulk e mail and when configured properlythey willsimply match an ESP's service. Even on a domestic 8MB ADSL connection it'sfeasible to deliver tens of a large number of emails per hour. My goal for this publish is tell youhow toachieve this with minimal expense. I will not go in to theprecise clicks and instructions (it is not a dummies guide) but itis going to be a good snapshot of my extremelyeffective model.

First of all, you need an ISP which isready to offer you a number of static IPs. BeThere give 16 static IPs for all-around £42 each monthincluding the ADSL connection. You getone WAN IP and 15 alias IPs. You will also need a trusted router able of dealing witha number of DMZs - I advocate the Draytek Vigor 2820.

Principally the architecture comprises a ratherimpressive server that acts as being adedicated virtual machine (VM) host by using VMWare ESXi server. The machine hosts 11 Ubuntu Servers (10 dedicated Postfix emailing servers, 1committed DNS server) just about every only needing the minimal RAM (256MB) and minimalvery difficult drive area (8GB). Each and every virtual machine is given a regional static IP (e.g. 192.168.1.10 - 192.168.1.21) and each and every Postfix server positioned individually within a DMZ. The end result is 10 devoted mailing servers, every sending from a devotedexternal IP (e.g. 84.252.220.200 - 84.252.220.210). Configure your company's domain to have a corresponding subdomain for every IP (e.g. email1.domain.com has an A document to 84.252.220.200, email2.domain.com has an A report to 84.252.220.201 and many others). Ask your ISP's DNS staff to configure the correct corresponding reverse IP (84.252.220.200 to email1.domain.com and so on). Develop an SPF reportusing the openspf challengeweb-site and utilize it for your domain's DNS server (you mightought to ask your domain's internet hostingcompany if they are able todo that).

Download ESXi server from VMWare's web site and signup to obtain the licence critical. It'san incrediblybasicinstall (assuming your machine is compatible). Subsequent, install an Ubuntu VM with default settings (naming it e.g. email1.domain.com) and set up Postfix (yet again default settings). Configure a static IP, DomainKeys / DKIM and export the public keyto your domain's DNS server. Use telnet from your linux terminal to verifyyou cansend emails which might be DomainKeys/DKIM signed and SPF authenticated. Acquiring all these to purposewith each otheraccuratelycould be abit of a nightmare so the Ubuntu neighborhood guides are priceless. Afteryou might beprepared tocheck, Google Mail is quiteuseful for viewing an email's completesupply and will allow you to verify the IP it originated from (e.g. 84.252.220.200), its corresponding domain title (email1.domain.com), whether or not the DomainKeys/DKIM signature handed and no matter whether your SPF file is setup appropriately.

SPF, DKIM and DomainKeys passing Gmail

Congratulations! You now have adedicated Ubuntu Postfix mailing server. Now, create a 2nd Ubuntu server virtual machine and install BIND, this will be the committed DNS server (named e.g. emaildns). Configure the forward lookup to no matter whatyou want (I use OpenDNS) and check its abilitiesemploying nslookup. Reconfigure your devoted emailing server's (email1 or no matter what you named it) default DNS server to emaildns. We want all our Ubuntu Postfix mailing servers querying here so our network isn't really bogged down with time and bandwidth consuming DNS lookups.

Whenyou happen to becontent everything's workingsince itreally shouldyou mayboth shutdown email1 and copy the files 9 instances to clone the VM or manually install it 9 extraoccasions. Cloning VMs can deliver up challenges like duplicate NICs and in my knowledgewhenyou have setup onee-mail server the other folkstake a fraction in the time. Ensure all possess thesimilar DomainKeys/DKIM privatecrucial!

When you'refinishedyou'll have 10 devoted Ubuntu Postfix servers desperate to deliver your mail from 10 separate exterior IPs. What everprogramyou happen to beutilizingto create and send your emails ought tofind a way to tackle 10 SMTP servers; Campaign Enterprise undoubtedly can that has asmallerquantity of configuration.

The UltimateResult

Now you could havetendevoted Ubuntu Postfix email servers, all verymodest, lightweight installations that requireextremelytiny CPU load with their very ownexternal IPs (and hostnames) setup to queryexactly the same DNS server.

The most effectivecomponent? I accomplishmarketamounts of deliverability by using this model and together with the exception of the server and ADSL contract it'sfree of charge! I've even lately had a call from Return Route asking no matter if I needed any help. Following discussing my stats they concluded they couldn'tenable! Great.

Now, to genuinely optimize your server's mailing performance, see my publish on Overall performance Tuning Postfix for sending bulk electronic mail.

About the Author


ubuntu for dummies part 2


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Idiots Guide To Linux

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how do i run linux on my tungsten e?

i came across a youtube video of a tungsten e running linux. i would appreciate an 'idiot's/dummies' type of guide on linux, how to install it etc. i also want to know where i can find programs that i can use once linux is installed in my tunsgten. thank you.

http://www.handhelds.org/moin/moin.cgi/PalmTungstenE2HowTo

This isn't exactly an "Idiot's Guide", as it wasn't not intended to be something that a "newbie" would understand (though I understand most of it). But it mostly seems to be just executing a couple commands in the console, and "compiling", where most of the work is done for you.

(Apple) Idiots Guide To Switching - Part 1


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Firewalls For Dummies

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Storage Area Networks For Dummies

A Storage Area Network (SAN) is a collection of storage devices that are tied together via a high-speed network to create one large storage resource that can be accessed by multiple servers. SANs are typically used to store, share and access enterprise data in a more secure and efficient manner compared to traditional dedicated storage models. With dedicated storage, each server is equipped with, and uses an attached storage capability. A SAN meanwhile basically acts as a common, shared storage resource for multiple servers. The storage devices in a SAN can include disk arrays, tapes and optical jukeboxes all of which can be accessed and shared by all of the attached servers.

How a Storage Area Network Works

In a storage area network, the pooled storage resources and the servers that access this storage are separated by a layer of management software. The software allows IT administrators to centralize and manage multiple storage resources as if it were one consolidated resource. Because of the software, each of the servers sees just one storage device, while each of the storage devices in the SAN sees just one server. Data can be moved at will to any of the devices on a SAN.

Factors Driving SAN Adoption

A variety of factors have been driving enterprise adoption of SAN architectures over the past few years. One of the biggest factors has been increased cost-efficiencies. Storage area networks allow companies to optimize the utilization of their storage resources. With an attached storage disk, any extra storage capacity on that disk would remain unused because no other server could use it. With a SAN on the other hand, all memory resources are pooled, resulting in better usage of existing capacity. Since SAN's allow data to be moved freely, enterprises can also move old and outdated data to inexpensive storage devices while freeing up the more costly devices for more important data.

Storage area networks make it easier for companies to expand their storage capacity, add resources on the fly, allot additional resources to an application, and maintain systems far more easily than traditional storage technologies. In addition, SANs allow companies to swap out a disk or tape-drive more easily and enable faster data replication. Importantly, SAN architectures allow storage devices from multiple vendors to be tied together into a common shared storage pool. Another advantage of SAN architectures is that they allow the storage network to be located at long distances away from the server hardware, thereby enabling greater disaster recoverability.

SAN Security a Big Concern

Despite such benefits, there are some caveats associated with the implementation of SAN architectures. Storage area network security is by far the biggest issue that companies need to do deal with when moving to a SAN storage model. With a SAN, companies are literally putting all of their most important data in one central resource. As a result the need for security controls such as firewalls, intrusion detection systems, SAN encryption and network monitoring are greatly heightened.

About the Author

Nexstara specializes in implementing Compellent's Storage Center because of its ability to virtualize data. They believe it's the best Storage area network security out there. More information about SAN encryption available in the site.

NetEvents Keynote Nir Zuk CTO Palo Alto Networks - inventor of the Firewall


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Tcp Ip For Dummies

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What is the technical term for the domain extension .com or .org?

I borrowed TCP/IP for Dummies and it said that new domain extensions were going to become available of the type that we now buy a single name from, so instead of ikea buying www.ikea.com they could buy the extension ikea and put computers on the web answering to www.america.ikea, www.britain.ikea or simply "ikea". It's going to be expensive at about $150,000US a pop but I know of one i would like to buy.

Can anyone tell me what the name of this field of a domain name is so i can search out when they are going to start selling?
thanks read this old piece if you are interested.

http://www.slate.com/id/2222408/

The last part of a domain address, like .com or .org, is called a top-level domain, or TLD.

The TCP/IP Stack - For Dummies - No Cats Special Edition!


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Unix For Dummies

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Can you help me with a "UNIX for Dummies" type question regarding a RegExp query?

All I want to do is search for an EXACT PHRASE in zipped files in a UNIX database, and have the querry return all instances of the exact phrase. (UNIX instruction manuals are too confusing!)

So, if I wanted to search a bunch of zipped files in a UNIX database for files containing the phrase
"the more details you provide", case insensitive - what exactly would I enter? I've used the GREP commands before, but don't really know what I'm doing. I'll really appreciate your help!
Thanks, Nicey and Publicident! if the files to search were UNzipped - what would the syntax be?

(Its a long complicated story as to why I haven't just bit the bullet and asked a coworker)

And yes, Mypublicident, I'll check out that link you suggested.

Anyone other suggestions for UNIX guides for the "mentally challenged" would be great. Thanks!

What you are asking for, regex searching in blobs is tough enough, but to add the fact that the files in the blobs are zipped really adds a wrench into the mix.

Ideally, you might index the files before they are zipped. Then though an olap cube you could wrench the data out that you need. If this isn't feasable, then the solution depends on your database. For example, in oracle, you can use java to extract the files, unzip to memory, then run regex queries on each file. Expect your queries to be mighty slow and processor intensive.

Worst case scenario you select a single blob at a time, unzip it, run grep -e or other regex utility on it, store the results, then move on to the next file. Something like this will take quite a while to run.

My suggestion is to work out a way to index the files based on what you think the regex expressions would be. Then run your queries against the indexed data for quick results.

I'm going to hate myself for saying this, but check out Kimball's book on data wharehousing. A bit more info than you'll need, but it'll provide a decent start for you.

Linux? EP 033 : Part 4 : Linux for Dummies?


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Linux For Dummies

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A dummy's question about C language?

Dear friends,

I have no knowledge of C language. I have used QBasic for my purposes, but I want to use a more "user-friendly" and "visual" language. I have considered Visual Basic, but it seems outdated; I am using Linux and I would like to learn C syntax and programming principles first, then jump to C++.

Which editor/programming medium shall I use?

Thank you for your responses.
Thank you very much for your interest. I caused a misunderstanding; I used to work with QBasic in a Windows operating system, but I uninstalled windows from my desktop computer right now, I am using my laptop with Windows installed, if I need a QBasic program. I am writing small Basic programs for over 10 years, so I think I am familiar with "programming" algorithms. I suppose that the only thing I must learn is the syntax and the main principle behind C to jump C++.

You should learn C, and ignore the people who are telling you that you are not ready for it. I would even recommend C as a first programming language to anyone.

There are several IDEs (Integrated Development Environments) for C and C++ in Linux. I recommend Code::Blocks which you can get from codeblocks.org, and it's completely free. There are also Anjuta and KDevelop but I don't think that they are so great (they're good for beginners, though).

To learn the language, get a book. There are plenty of free ones in freecomputerbooks.com !
If you need help during your studies feel free to ask here :)

TosCast 3 Ubuntu Linux For Dummies


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Droid For Dummies Book

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Where can I find a 'droid for dummies'?

I just got a Droid Eris and I need help! I've figured out some things but I have some other questions like, everytime I listen to my music it locks my phone up. Is it an app that I can deleter and get a new one, or do I have to leave it on my phone? I don't know what I'm doing. The book that came with it is not very good. And when I try to read on the internet I have no idea any of the terminology they're using. Help!

You could go to HTCs site to get the full user manual, but in a verizon store is where you're gonna get the most help. you could ask me some questions if you want but since I cant actually see the phone, idk how much help I'd be. I have the motorola one so I can definitely help with that one if you have any questions

Evo 4G Phone Full Review


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