Server – VPS – Web Hosting Info
Techno Babble
E-mail Alert on Root SSH Login
Mar 27th
Want to be notified instantly when someone logs into your server as root?
No problem, check out this nice tutorial on email notification for root logins. Keeping track of who logs into your server and when is very important, especially when you’re dealing with the super user account. We recommend that you use an email address not hosted on the server your sending the alert from
Turbo charging MySQL by setting up the query cache
Mar 27th
To make sure MySQL uses the query cache, there are a few variables you need to set in the configuration file . Usually its my.cnf or my.ini so check on your server with the shell command locate , in our case we are running on a CentOS 5.2 distro and to its my.cnf located in /etc so we opened it by using : nano /etc/my.cnf
Moving mySQL DBs between servers
Mar 27th
Moving mySQL DBs from one server to another:
mysqldump -uUSER -pPASSWORD txp_database > txp_database.sql
puts the entire thing in one nicely portable text file.
on a new server it takes
mysql -uUSER -pPASSWORD txp_database < txp_database.sql
to import it.
Linux Cron Jobs Explained
Mar 27th
Cron allows users to automate repetitive system administration tasks such as tape backups, database reorganization, and general file cleanups (such as emptying log files and queues).
The Crontab File’s Syntax
To tell cron what you want it to run, and how often you want it to run it, you need to create a crontab file. A crontab file is just a text file with the following syntax:
Taking backup of mysql database using cron
Mar 27th
Taking backup of mysql database using cron
Create a file called database_backup.sh and also an empty directory called mysql_backup. The database_backup.sh script should have the following info :
PRM (Process Resource Monitoring) in Linux Servers
Mar 26th
The great people from R-FX Networks are bringing us a number of powerfull tools for the Linux Server enviroment
PRM (Process Resource Monitoring) monitors the process table on a given system and matches process id’s with set resource limits in the config file or per-process based rules. Process id’s that match or exceed the set limits are logged and killed; includes e-mail alerts, kernel logging routine and more…
The old JavaScript cPanel Server exploit
Mar 20th
The Javascript exploit has been an old saga on a few Linux distros running cPanel and Plesk .
The compromise is at the root level and a rootkit has been installed. This rootkit will attach to several syscalls within the kernel and begin serving malicious javascript to random web visitors.
This root compromise is not related to cPanel directly, as it has been reported on many different control panels on many different servers. The compromise is at the system level, and only Redhat 4, CentOS 4, and FC6 appear to be vulnerable at this time. We are actively researching this issue and will have an in-depth analysis of current information posted soon. More >
CentOS 5.1 Server Setup: LAMP, Email, DNS, FTP, ISPConfig (a.k.a. The Perfect Server)
Feb 26th
This tutorial shows how to set up a CentOS 5.1 based server that offers all services needed by ISPs and web hosters: Apache web server (SSL-capable), Postfix mail server with SMTP-AUTH and TLS, BIND DNS server, Proftpd FTP server, MySQL server, Dovecot POP3/IMAP, Quota, Firewall, etc. This tutorial is written for the 32-bit version of CentOS 5.1, but should apply to the 64-bit version with very little modifications as well.
How to install mod_gzip on a Linux server
Jan 27th
This guide will show you how to install mod_gzip on your Linux server
mod_gzip – what’s that, anyway?
mod_gzip – serving compressed content by the Apache webserver
mod_gzip is an external extension module for the WWW’s most popular web server Apache, created in autumn, 2000.
Its implementation allows for using the compression method gzip for a significant reduction of the volume of web page content served over the HTTP protocol.
How to check and stop if DDoS attack is going on.
Sep 20th
Distributed denial-of-service attacks
In a distributed attack, the attacking computers are often personal computers
with broadband connections to the Internet that have been compromised by viruses
or Trojan horse programs. These allow the perpetrator to remotely control machines
to direct the attack, and such an array of computers is called a botnet. With
enough such slave or zombie hosts, the services of even the largest and most well-connected
websites can be disrupted.
Downgrading MySQL5 to MySQL4.1 in cPanel
Aug 25th
For whatever reason , some people still want to run the old version of MySQL4.1 in there new cPanel servers, which seems a little issue , as the default database version in new cPanel server installs is MySQL5.
Here are the simple steps to downgrade the database (this should only be done on a new server without any account on it yet)
MD5 password generator
Aug 22nd
Easyapache failing on CentOS server
Jul 20th
Had an issue with one on our CentOS cPanel servers running 64 bit and cPanels easyapache upgrade. The folks at cPanel helped out with their usual professional response
How to find MAC address in CentOS
Jul 19th
Open SSH and type the following and press Enter:
/sbin/ifconfig | grep -i hwaddr
The sequence of hexadecimal digits that appears to the right of eth0 HWAddr (e.g. 08:00:27:ED:DA:8b) is
your network card’s MAC Address
Problems with CenotOS5 – cPanel and BIND
Jun 22nd
If you have issues with cPanel running CentOS5 with BIND then the easiest way is to downgrade BIND to 9.2.4
The reason you’re having trouble is because CentOS 5 uses bind-9.3 and CentOS 4 uses bind-9.2 – The changes between these versions is significant enough that cPanel won’t work with it properly.
For instance by default there is no /etc/named.conf file created when bind-9.3 is installed and the default named.conf file for bind-9.3 is significantly different than in older versions.
Until the code is updated to work with bind-9.3, I have found the workaround to be to remove bind-9.3 packages and install bind-9.2 packages as follows:
kernel yum upgrade
Jun 21st
check what kernel you are running at the moment
uname -a
and to upgrade your kernel
yum update \kernel*
check if your kernel is added to grub
cat /boot/grub/grub.conf
and then reboot
shutdown -rf now
Installing SSH public key for extra security on your Linux server
Jun 21st
Log into SSH
mkdir $HOME/.ssh
chmod -R og= $HOME/.ssh
cd .ssh
nano authorized_keys2
Add your key you created with PuttyGen , make absolutly sure you r key is in one line ONLY , otherwise it wont work!
Adjust your sshd_config
nano /etc/ssh/sshd_config
to
RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys2
Installing and configuring Windows CDP Agents
Jun 19th
R1Soft CDP is a easy to install and use continous data protection system, primarily targeted at the hosting market. It backups up multiple servers to a central backup server; multiple backup windows can be performed per day, and files or even the whole disk can be restored from the image. This tutorial will show you how to install the Windows Agent on a server which you want to be backed up, and how to configure it.
More >
Recover broken systems with SystemRescueCD
Jun 17th
SystemRescueCD is a powerful, expansive live cd which is useful for recovering broken systems. This tutorial will guide you through how to get it up and running and how to perform some basic recovery procedures.
Installing and configuring Linux CDP Agents
Jun 17th
R1Soft CDP is a easy to install and use continous data protection
system, primarily targeted at the hosting market. It backups up
multiple servers to a central backup server; multiple backup windows
can be performed per day, and files or even the whole disk can be
restored from the image. This tutorial will show you how to install the Linux Agent on a server which you want to be backed up, and how to
configure it.
