Install Perl Modules on CentOS 6

sudo yum install perl-CPAN
sudo cpan
say "yes" to everything

I had an error about missing perl-YAML, sudo yum install perl-YAML, as well.

Can't Install Modules and Themes From Drupal Page on CentOS 6

This is the error message that I got.

Run command "sudo setsebool -P httpd_can_network_connect on", it might take a few minutes for it to fully complete.

Setup SSH Option on Drupal Module and Theme Update on CentOS 6

yum -y install php-pear php-devel gcc libssh2-devel
pecl install "channel://pecl.php.net/ssh2-0.12"
echo extension=ssh2.so > /etc/php.d/ssh2.ini
service httpd restart

This is what happens afterwards.

Install VirtualBox Guest Additions for CentOS 6

1) Make sure the computer has network connection
2) mkdir rpm
3) cd rpm

Location of RPMForge for CentOS: http://wiki.centos.org/AdditionalResources/Repositories/RPMForge
Download the rpmforge-release package. Choose one of the two links below, selecting to match your host's architecture. If you are unsure of which one to use you can check your architecture with the command uname -i

i686 http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.i686.rpm
x86_64 http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm

4) wget http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.i686.rpm
5) rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt
6) rpm -i rpmforge-release-0.5.3-1.el6.rf.i686.rpm
7) yum install dkms
8) y
9) Devices -> Insert Guest Additions CD image...
10) mount -t iso9660 /dev/dvd1 /media
11) cd /media
12) sh ./VBoxLinuxAdditions.run
13) It will complain of missing kernel-devel-x..., do a yum install kernel-devel-x... whatever version it is.
14) sh ./VBoxLinuxAdditions.run

Now you can use commands such as, vboxmanage guestcontrol

CentOS 6 Running Out Of Space

Error message: At least 2MB more space needed on the /boot filesystem.

rpm -qa | grep kernel
Resulting grep:
kernel-2.6.32-71.el6.x86_64
kernel-2.6.32-71.29.1.el6.x86_64
kernel-2.6.32-131.0.15.el6.x86_64

Newest one is 2.6.32-504
Remove all except the most recent one
rpm -e kernel-2.6.32-71.el6.x86_64 kernel-2.6.32-71.29.1.el6.x86_64

Update kernel
yum -y update kernel

Update other things (optional)
yum -y update

Reference: http://www.cyberciti.biz/faq/installing-kernel-2-6-32-131-2-1-el6-x86_64-needs-8mb-on-boot-filesystem/

CentOS Web Server Port 80 iptables

Setup Apache on your web server, but webpage does not show.

iptables -I INPUT -p tcp --dport 80 -j ACCEPT
service iptables save

CentOS SSH Port Change

Changed port in /etc/ssh/sshd_config, what else is needed?

iptables -I INPUT -p tcp --dport PORT-NUMBER -j ACCEPT
service iptables save

CentOS 6.6 eth0 network not working

After installing CentOS 6.6, eth0 exists in list running "ifconfig -a", but no inet addr. eth0 is not active

"vi /etc/sysconfig/network-scripts/ifcfg-eth0", change "ONBOOT=no" to "ONBOOT=yes"
esc :wq
"service network restart"