Linux VPS Hosting

Linux VPS hosting services are seen as the next upgrade for users who are outgrowing their Linux shared web hosting plan and require either larger resource assignments that can’t be had with shared web hosting services or added indepence and reliability. Linux VPS servers come with full root access via SSH enabling you to manage your VPS server directly, although if you require a control panel of some sort then most web hosting providers are able to offer the cPanel control panel with their Linux VPS hosting services. As you have full root access you are able to configure your Linux VPS server to function in the way that you want it to, for example you may want to make certain configuration changes; this also means that you can install any applications of your choice. Linux VPS servers are ideal for the hosting of PHP and MySQL based websites which require third-party components or applications to function correctly, and in some cases users are forced to consider Linux VPS hosting for this exact reason. Linux VPS servers are usually the cheapest VPS servers around, the reason for this being that web hosting providers don’t have to factor in any further costs such as operating system license fees.

Linux VPS hosting may seem daunting for some users to have never managed Linux servers properly before; in such a case you can always consider managed Linux VPS server hosting. Although Linux VPS server hosting may seem daunting at first when you consider the management that is needed as well as how much you will have to pay for a VPS, the benefits that you will recieve in the long term make it good value for money. You are normally able to choose between Linux VPS servers that are based on either Virtuozzo, OpenVZ or Xen; for the best performance you should consider Virtuozzo VPS hosting, but if you don’t want to pay much for your web hosting service then you should consider OpenVZ and Xen VPS hosting solutions.

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Virtuozzo vs. Hyper-V

Hyper-V and Virtuozzo are both popular VPS platforms used by a large number of web hosting providers for the provisioning of Windows VPS server hosting services, with Virtuozzo being favoured for Windows Server 2003 VPS hosting and Hyper-V being the most reliable solution for Windows Server 2008 VPS hosting services. When the two virtualization platforms are compared they don’t share that much in common, with Virtuozzo being designed more or less specifically for use in web hosting whilst Hyper-V has been designed with larger corporations in mind rather than for commercial purposes. Some users may have their own preferences when it comes to which virtualization system their VPS servers are based on; however, the virtualization platform that your web hosting providers uses is unlikely to have any kind of effect on how your Windows VPS server functions.

Virtuozzo and Hyper-V both offer reliable Windows VPS servers, regardless of the Windows operating system version that you will be running, although the fact that Hyper-V is part of the operating system and isn’t a third-party application or component means that it is likely to be more reliable in certain circumstances than Virtuozzo. The main feature that differentiates the two virtualization platforms is that Virtuozzo comes with a web based interface that offers users an alternative way to manage their VPS server, and this is known as the Parallels Power Panel; although Hyper-V doesn’t come with this sort of feature as standard, web hosting providers are able to use third-party applications such as DotNetPanel (DNP) to achieve a similar system. As Hyper-V is mainly used to power Windows Server 2008 VPS servers, Hyper-V VPS hosting services are going to be slightly more expensive than Virtuozzo Windows VPS hosting services - Virtuozzo tends to be used to power Windows Server 2003 VPS servers, although it is also used for Linux VPS hosting as well.

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Hyper-V VPS Web Hosting

Previously a majority of web hosting providers had used the Virtuozzo VPS hosting platform to offer Windows Server 2003 based VPS hosting solutions, but with the release of Windows Server 2008 web hosting providers no longer need to make use of third party applications in order to offer Windows VPS hosting services. With Windows Server 2008 comes the Hyper-V virtual machine platform, and as this is included with Windows Server 2008 web hosting providers are able to offer Windows Server 2008 VPS hosting services at a low cost. Hyper-V VPS hosting services allow Windows web developers to make the most of what Windows Server 2008 has to offer, such as the IIS 7 web server. Although Hyper-V itself doesn’t offer consumers any form of web based control panel that they can use to manage their virtual machine, some web hosting providers are making use of the features that DotNetPanel has to offer which will allow users to manage their Hyper-V VPS servers using a web based control panel.

Hyper-V Windows Server 2008 VPS hosting servers will come with the same set of features that you would find with a standard Windows VPS server; this includes administrator access via Remote Desktop and guaranteed assignments of disk space, RAM and bandwidth, but because of the nature of Windows Server 2008 the likelihood is that you will have to pay more for a basic VPS server because of the extra resources that are needed. Hyper-V works differently to other VPS platforms that are available as it is part of the operating sytem which will allow for better performance, whereas alternatives such as Virtuozzo are installed on top of the operating system as regular applications. Although Hyper-V VPS hosting may cost more than your average Windows Server 2003 based VPS server, the advantages you get in terms of the performance increase and the fact that you will be able to make use of Windows Server 2008 justify the cost for most people.

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VPS Server Hosting

Web hosting providers are able to offer consumers Windows VPS hosting and Linux VPS hosting web hosting services as alternatives to dedicated server hosting services for users who need the power of a dedicated server but are unable to afford the high costs that are associated with dedicated web hosting. In order to offer reliable VPS hosting services, a majority of web hosting providers make use of the Virtuozzo VPS platform which will enable them to offer both Windows VPS servers and Linux VPS servers using the same system; this can make management for both consumers with multiple VPS servers and web hosting providers much easier.

VPS server hosting is seen as the next step up from shared web hosting services, and this is reflected in what you get for your money as well as the pricing of most VPS servers; VPS servers can also offer a level of power and reliability similar to that of dedicated servers but at a much lower cost. VPS servers can be used for a number of different things, and since you are provided with root/administrator access to your own dedicated environment you will be able to install any applications of your choice on your VPS server; the only limits with what you can install on a VPS server are the amount of disk space and bandwidth you have available as well as the amount of guaranteed RAM that you have assigned to your VPS server. In order to make the most of VPS server hosting you should purchase a high end VPS server which will fulfill your needs for the time being and the future, meaning that you won’t have to upgrade your VPS server for a long time to come; after all, it is always a good idea to give your website a bit of growing space so that you don’t end up with any nasty surprises (such as your VPS crashing because your website has become too resource intensive).

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Plesk vs. DNP (Dot Net Panel)

Plesk and Dot Net Panel (sometimes abbreviated to DNP) are both Windows web hosting control panels that offer users an easy way to manage their Windows web hosting account whilst still being able to manage their web hosting account in other ways such as via FTP. Although Plesk has been the most popular Windows web hosting control panel around for a long time, DNP is now a strong competitor and is being taken up by many web hosting providers to replace their Plesk Windows web hosting servers.

Dot Net Panel has many features which Plesk lacks, such as support for Hyper-V VPS server hosting services as well as Microsoft Exchange Server 2007 email hosting services; this effectively leads Plesk in the dust when it comes to which web hosting control panel is the most feature rich, although Plesk still has a lot to offer when it comes to basic server management and Windows shared hosting services. However, because the Virtuozzo VPS daemon that is popular with many web hosting providers for offering their VPS hosting services, Plesk still has a strong case when it comes to VPS hosting; many VPS hosting providers offer the Plesk web hosting control panel for free with their Windows VPS servers because they are able to get licenses at a reduced cost due to their use of Virtuozzo. Both Plesk and DNP offer users with an easy to use interface that makes it easy for both clients and server managers to manage their own side of the deal; however, Dot Net Panel’s interface is a lot smoother and quicker to load than the interface which is offered by Plesk. The main thing to remember is that both Plesk and DNP are able to run smoothly on Windows based web hosting servers, however it is recommended that you only run either web hosting control on a mid to high-end Windows VPS server or dedicated server.

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Hello,

If you are getting following error  with wordpress while uploading images.

The uploaded file could not be moved to  /home/username/public_html/wordpress/wp-content/uploads

then please make sure that

safe_mode_gid=ON  (in php.ini)

and check the permission of upload directory it should be 777 , if it is something different then change it to 777 with following command

chmod 777 wp-content/uploads
and issue will get resolved.

If you want to change few php values for your Linux VPS web hosting server then you will have to edit /etc/php.ini file on your VPS. As a VPS server Administrator you would be having root access to your server thus you have access to php.ini file of your server. You can easily change all required PHP settings/value such as post_max_size, memory_limit, asp_tags, upload_max_filesize etc…… for your server through php.ini file.

For example : If you want to turn register_globals ON, you will need to change the line from your php.ini file. just search for register_globals = Off and change it to register_globals = On. Thus by amending your PHP.ini file you will turn ” register_globals ON ” for every domain hosted on your VPS unless a domain has a different value specified in its vhost.conf file.

Bzip2 is great utility which you can use with your VPS server. if you want to install it on your server just follow the following instructions.

# cd ..
# wget bzip.org/1.0.3/bzip2-1.0.3.tar.gz
# Type: tar zxvf bzip2-1.0.3.tar.gz
# Type: cd bzip2-1.0.3
# Type: make install

With APT:
# apt-get update
#Type: apt-get install bzip.

thats all, you can use Bzip on your server.

[Fri Oct 10 00:11:01 2008] [warn] pid file /usr/local/apache/logs/httpd.pid overwritten — Unclean shutdown of previous Apache run?
semget: No space left on device

This error occurred because there is no more space left in Semaphore Arrays for Apache.

You can check semaphore arrays on your server using the following command .

# ipcs -s

If you see too many of them, run the script as given below

#for i in `ipcs -s | awk ‘{print $2}’`; do ipcrm -s $i;done

Now restart Apache services

# service httpd startssl

Now Fixed….

PHP and Apache are not being able to track which users are sending out mail through the PHP mail function from the nobody user causing leaks in formmail scripts and malicious users to spam from your server without you knowing who or where.

Monitiring exim_mainlog doesn’t exactly help, you see th email going out but you can’t track from which user or script is sending it. This is a quick and dirty way to get around the nobody spam problem on your Linux server

If you check out your PHP.ini file you’ll notice that your mail program is set to: /usr/sbin/sendmail and 99.99% of PHP scripts will just use the built in mail(); function for PHP - so everything will go through /usr/sbin/sendmail
Requirements:

We assume you’re using Apache 1.3x, PHP 4.3x and Exim. This may work on other systems but we’re only tested it on a Cpanel/WHM Red Hat Enterprise system.

Step 1:

Login to your server with root.

Step 2:
Turn off exim before proceeding
service exim stop

Step 3:
Take the Backup of your original /usr/sbin/sendmail file

mv /usr/sbin/sendmail /usr/sbin/sendmail_bak

Step 4:

You need to Create the spam monitoring script for the new sendmail.
pico /usr/sbin/sendmail

Paste in the following:

#!/usr/local/bin/perl

# use strict;
use Env;
my $date = `date`;
chomp $date;
open (INFO, “>>/var/log/spam_log”) || die “Failed to open file ::$!”;
my $uid = $>;
my @info = getpwuid($uid);
if($REMOTE_ADDR) {
print INFO “$date - $REMOTE_ADDR ran $SCRIPT_NAME at $SERVER_NAME n”;
}
else {

print INFO “$date - $PWD - @infon”;

}
my $mailprog = ‘/usr/sbin/sendmail.hidden’;
foreach (@ARGV) {
$arg=”$arg” . ” $_”;
}

open (MAIL,”|$mailprog $arg”) || die “cannot open $mailprog: $!n”;
while (<STDIN> ) {
print MAIL;
}
close (INFO);
close (MAIL);

save and close

Step 5:
Now change the new sendmail permissions
chmod a+x /usr/sbin/sendmail

Step 6:

Create a new log file to keep a history of all mail going out of the server using web scripts
touch /var/log/spam_log

chmod 0777 /var/log/spam_log

Step 7:
Start Exim up again.
/etc/init.d/exim start

Step 8:
You can Monitor your spam_log file for spam, try using any formmail or script that uses a mail function - a message board, a contact script.
tail - f /var/log/spam_log

Reference taken from : webhostgear.com