Archive for the ‘centos’ Category

How to change the timezone on CentOS/RHEL

May 23rd, 2011 by @HKw@! | No Comments | Filed in centos, Fedora, RedHat

I noticed that my Centos Server logs is not on the correct time. I tried to check the time from the command line and found that the timezone is pointing to the wrong timezone

root@thundercat ~]# date
Mon May 23 00:21:56 EDT 2011

How to change it? There are two ways to change the timezone on CentOS. (more…)

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How to limit SSH access by IP Address

May 9th, 2011 by @HKw@! | No Comments | Filed in centos, Debian, Fedora, Linux, RedHat, Ubuntu
To Secure your Linux server and prevent attacks, you can limit SSHd to certain IP addresses by modify the /etc/hosts.allow and /etc/host.deny files

Below are the few steps :-

1) Open /etc/hosts.allow

Use the following command to open the hosts.allow file:

vi /etc/hosts.allow

Once this file is open, add the following line:

SSHD : ipaddress : ALLOW

2) Open /etc/hosts.deny

Use the following command to open the hosts.deny file:

vi /etc/hosts.deny

Once it opens, add the following line to the file:

SSHD : ALL : DENY

Save and exit, and you have successfully limited SSH access by IP address.

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How to upgrade Centos 5.5 to Centos 5.6

April 15th, 2011 by @HKw@! | No Comments | Filed in centos, Linux

Latest version of Centos (Centos 5.6) has been released and it available for download.

Below are the major changes in Centos 5.6

The CentOS team is pleased to announce the availability of CentOS 5.6. Major changes in CentOS 5.6 compared to CentOS 5.5 include:

ext4 is now a fully supported file system
libvirt was updated to 0.8.2
bind was updated to 9.7 and supports NSEC3 now.
ebtables was added
php53 is available as a php replacement.
System Security Services Daemon (SSSD) has been added.

Other upgrades include newer version of several wireless drivers, Samba3x, ghostscript, LVM, mod_nss, subversion and gcc, plus others. (more…)

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