Verifying downloaded ISO images for integrity

After getting ISO images either from mirror sites or from torrent or from on of your friend’s PC, you need to verify the iso image to – ensure that the ISO is complete – ensure that files inside has not be altered – ensure that the ISO is a legitimate one

1) Verifying ISO image . . . → Read More: Verifying downloaded ISO images for integrity

How to install and setup tripwire in CentOS 6

1) Install epel (Extra Package for Enterprise Linux) repo # rpm -ivh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-5.noarch.rpm

2) Install tripwire package # sudo yum -y install tripwire

3) Run “tripwire-setup-keyfiles”. It will generate site-key-phassphrase and local-key-passphrase and also create below files inside /etc/tripwire folder: site.key ==> site key to encrypt tripwire cfg file and policy file hostname-local.key ==> local . . . → Read More: How to install and setup tripwire in CentOS 6

How to setup pptpd VPN server in CentOS 6 ?

1) Install poptop repository. Note the directory contains “rhel6″ for “centos 6″.

# rpm -ivh http://poptop.sourceforge.net/yum/stable/rhel6/pptp-release-current.noarch.rpm

2) Install pptpd and ppp package

# yum –enablerepo=poptop-stable install pptpd ppp

. . . → Read More: How to setup pptpd VPN server in CentOS 6 ?

Permissions in cron

cron permission with cron.allow and cron.deny . . . → Read More: Permissions in cron

mount.nfs operation not permitted after upgrading to centos 6.0

I had a backup script which would mount backup disk from centralised backup server via nfs and then copy the mentioned files with rsync tool. After upgrading one server to centos 6.0, then the script stopped working and started to generate error like this : rsync: chown “” failed: Invalid argument (22)

After querying, I . . . → Read More: mount.nfs operation not permitted after upgrading to centos 6.0

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