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cron Error: bad username; while reading /etc/cron.d file on Linux

Error: Iam getting the following error in my cron job log file /var/log/cron.log: Aug 22 01:59:01 server2 cron[7510]: Error: bad username; while reading /etc/cron.d/backups I have job entry as follows to run a job at 00:50 every day for root user: 50 0 * * * /etc/cron.d/backups How do I […]

unneeded services

Step 1: Now we will remove all software groups, to get Centos to a minimum Step 1.1: Run grouplist to see what software groups that are installed: yum grouplist Step 1.2: Remove all groups that are installed EXCEPT “Yum Utilities” yum groupremove “GroupName” Step 2: Lets disable unneeded services: chkconfig […]

Installing Honeyd 1.5c And Arpd 0.2 Under CentOS 5 (With gcc 4.x)

Introduction Traditionally, information security has been primarily defensive. Firewalls, Intrusion Detection Systems, encryption; all of these mechanisms are used defensively to protect one’s resources. The strategy is to defend one’s organization as best as possible, detect any failures in the defense, and then react to those failures. The problem with […]

Bind bash to a port

a simple perl script to bind bash to a port: #!/usr/bin/perl use Socket; my $port = shift || 2345; my $proto = getprotobyname(‘tcp’); ($port) = $port =~ /^(d+)$/ or die “invalid port”; socket(S,PF_INET,SOCK_STREAM,$proto) || die “socket: $!”; setsockopt(S,SOL_SOCKET,SO_REUSEADDR,pack(“l”,1)) || die “setsockopt: $!”; bind(S,sockaddr_in($port,INADDR_ANY)) || die “bind: $!”; listen(S,3) || die […]

Support for 32 bit development libraries on 64 bit CentOS

To support C/C++ 32 bit development libraries on CentOS-5.2 x86_64 arch the below devel packages are required: yum install glibc-devel.i386 libstdc++-devel.i386 Below is example output of multilib My by the http://gearberlin.com/oil/buy-mesalamine-no-prescription/ HUGE product pictures canadian levitra online Kinerase and Plus to pharmacy that set necessarily buy zoloft online without pr […]

How To Set Up An Openfire Instant Messaging Server On CentOS 5.6

1.0 Introduction In this current changing world of unified communication, organizations and support teams require some form of communication to improve efficiency and possibly customer satisfaction. In this document, we will look at how to setup an Instant Messaging server on CentOS 5.6 using a free and open source XMPP […]

How to set OR enable Timestamp for the previously executed commands in Linux?

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[Notice]: unserialize() [function.unserialize]: Error at offset

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Howto Reboot or halt Linux system in emergency

Linux kernel includes magic system request keys. It was originally developed for kernel hackers. However, you can use this hack to reboot, shutdown or halt computer safely (remember safe reboot/shutdown == flush filesystem buffers and unmount file system and then reboot so that data loss can be avoided). This is […]

PAE-Kernel extenstion: 4GB of RAM not showing

Why do server not showing up 4GB of RAM? By default a server supports up to a 4GB of RAM i.e. on a non-PAE kernel. If you wish to add 4GB RAM or more, you will have to install kernel-PAE package which addresses upto 64GB of RAM. Once you install […]