amit

> cp -P

Xuggler uses ffmpeg to convert any media files to any media files. /usr/local/xuggler/bin/ffmpeg -y -threads 2 -i  source.avi -vcodec libx264 -fpre   video-high.ffpreset         ‘output.mp4’

e2label /dev/sdc1 /backupDisk

ls /sys/class/scsi_host replace the host below with the output of above command. echo "- - -" > /sys/class/scsi_host/<strong>host#</strong>/scan<br></br> fdisk -l<br></br> tail -f

Force Apache to use https : RequestHeader set X_FORWARDED_PROTO 'https'

Putty (Stores Session in a Folder ) [https://www.amitnepal.com/content/images/2011/08/ntputty.exe] Windows 7 Background Changer [https://www.amitnepal.com/content/images/2011/08/Win7LogonBackgroundChanger.exe]

Verify that sshd is not infected : strings /usr/sbin/sshd | grep %s:%s -A2 -B2 |head -3 If this outputs any file name, then check the filename if it has any passwords on that file. Verify that ssh, sftp etc.. are not infected : rpm -Vv openssh openssh-server openssh-clients | egrep -v

Tcp wrappers add an additional layer of security. Tcp Wrappers use two files namely : /etc/hosts.allow and /etc/hosts.deny hosts.allow file has precedence over hosts.deny . So it is a better idea to allow selectively in hosts.allow file and then deny all in the hosts.deny

> for user in $(cut -f1 -d : /etc/passwd); do crontab -u $user -l; done

rpm –import http://dev.centos.org/centos/RPM-GPG-KEY-CentOS-testing cd /etc/yum.repos.d wget http://dev.centos.org/centos/5/CentOS-Testing.repo yum install –disablerepo=* –enablerepo=c5-testing

Master – Master Replication Between two MySQL Servers The most important thing to consider in MySQL Master-Master replication is the auto increment field. In order to avoid getting data for a single field from both servers which breaks replication with the error message : duplicate entry. It is always good idea to

instmodsh

Rsyslog V 5 supports TLS / SSL for sending and receiving logs. Download the source from here :http://www.rsyslog.com/rsyslog-5-8-4-v5-stable/ Steps : Do this on both client and server 1. cd /usr/src 2. wget http://www.rsyslog.com/rsyslog-5-8-4-v5-stable/ 3. tar -zxvf  rsyslog-5-8-4-v5-stable 4. cd rsyslog-5-8-4 5. yum install

A new slave can be added to an existing replication without stopping the master. Setup the new slave by making a copy of existing slave. Dont forget to change the server-id value . To copy an existing slave : 1. Stop the slave : >mysqladmin shutdown 2. Copy the data directory from

The following steps are to be followed to setup replication of an existing MySQL Database : 1. Login To the Existing mysql database and issue the following command : > reset master; > FLUSH TABLES WITH READ LOCK; > Master Show Status; Note the Binary Log Position and the Binary Log name

It is good idea to turn of MySQL server at start. So that if the master goes down it does not start by itself when it comes back up. Follow these steps on the slave : Note: The Slave also has to be setup with binary logging enabled. In order to

> !/bin/sh # # Startup script for the Apache Web Server # # chkconfig: 345 85 15 # description: Apache is a World Wide Web server. It is used to serve \ # HTML files and CGI. # processname: httpd # pidfile: /var/run/httpd.pid # config: /etc/httpd/conf/httpd.conf # Source function library. . /etc/rc.d/

apxs -i -a -c modules/filters/mod_deflate.c http://httpd.apache.org/docs/current/dso.html

The following script can help uninstall perl module > !/usr/bin/perl -w use ExtUtils::Packlist; use ExtUtils::Installed; $ARGV[0] or die “Usage: $0 Module::Name\n”; my $module = $ARGV[0]; my $inst = ExtUtils::Installed->new(); foreach my $item (sort($inst->files($module))) { print “Removing $item\n”

To view what packages are installed from which repo : rpm -qa --qf '%{NAME} %{VENDOR}\n' Display RPM Architecture Just one line in ~/.rpmmacros will save all sorts of trouble later. echo "%_query_all_fmt %%{name}-%%{version}-%%{release}.%%{arch}" >> ~/.rpmmacros

This command will show you the list of last failed login attempts : last -f /var/log/btmp This file can get huge, so you might want to rotate this file : > /var/log/btmp { monthly minsize 1M create 0600 root utmp rotate 1 } You can put this in logrotate.conf

Force Log Rotation : logrotate /etc/logrotate.d/file_to_be_rotated or `logrotate -v -f /etc/logrotate.d/firewall           (v = verbose, f = force even if not required) ``` In order to rotate a log file you can add an entry to #/etc/logrotate.conf or you can create a custom separate

cannot find lltdl : libtool-ltdl-devel

Create an alias email from postfixadmin and set go to to be  pipe_handler@hostname eg. set support@xyz.com to go to supporthandler@hostname.com Edit aliases file : vi /etc/postfix/aliases Add the following line at the end: supporthandler: “| php -q /path/to/handler.php” save the file

You can have your server log files sent to an email address. Edit the logwatch configuration file : vi /etc/logwatch/conf/logwatch.conf ( if this file is empty , edit the following file) vi /usr/share/logwatch/default.conf/logwatch.conf find mailto and put the email address there. Or you