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Technical Notes

Submitted by siteadmin on Thu, 01/03/2008 - 21:46

These notes are my personal online notebook of useful commands and "how-to's". You are welcome to make use of them if you find them helpful. They obviously don't come with any warranty! Click on one of the category tags above for the notes in any category.

Upgrading CentOS 6 to PHP 5.4 (or 5.5)

Submitted by siteadmin on Sat, 11/07/2015 - 21:32
  • SCL is the way to go since it has RedHat’s blessing

Note that it is the .conf file that controls which version of php is used. For some reason this does not seem to be available for php55.

Moving from CentOS 6 to 7

Submitted by siteadmin on Sat, 08/09/2014 - 19:02

KVM: setting up bridged mode

systemctl disable NetworkManager
systemctl enable network
systemctl stop NetworkManager
systemctl start network
  • The only problem with the above is that network does not seem to start on boot.
chkconfig --list network    # shows that it should be running
systemctl start network     # the

Setting up NFS4 on CentOS

Submitted by siteadmin on Fri, 06/27/2014 - 23:53

First: install server software and start it

yum install nfs-utils nfs-utils-lib system-config-nfs
yum install nfs-utils nfs4-acl-tools portmap
chkconfig nfs on
chkconfig portmap on
service nfs start
echo 'portmap:ALL' >> /etc/hosts.deny
echo 'portmap:192.168.1.0/24' >> /etc/hosts.allow
service portmap start

run the firewall gui and turn on NFS4 (2049)

NNTP time updates on CentOS

Submitted by siteadmin on Mon, 12/23/2013 - 15:11 
yum install ntp ntpdate ntp-doc
chkconfig ntpd on
ntpdate pool.ntp.org
/etc/init.d/ntpd start
date

from: www.cyberciti.biz/…erver-clock

Install/Upgrade owncloud on CentOS

Submitted by siteadmin on Mon, 06/11/2012 - 15:05

A new way of creating a website is using what is sometimes called a “headless” site, with the front end being served by an MVC framework (Model View Controller).

Headless Drupal means using Drupal purely for content creation and management and feeding all the data in JSON format to a JavaScript front end.

Installing rdiff-backup on CentOS 6 or 7

Submitted by siteadmin on Fri, 06/08/2012 - 23:54
  • Install LAMP stack
apt -y install openssh-server
apt -y install tasksel
tasksel install lamp-server
  • Some basic stuff

Upgrading CentOS 5 from PHP 5.1 to 5.3

Submitted by siteadmin on Thu, 12/15/2011 - 04:22
  • see what is installed (assuming php-mcrypt & php-mhash are installed
yum list installed | grep php | cut -d' ' -f1
typical result:
php.x86_64
php-cli.x86_64
php-common.x86_64
php-devel.x86_64
php-gd.x86_64
php-imap.x86_64
php-ldap.x86_64
php-mbstring.x86_64
php-mcrypt.x86_64
php-mhash.x86_64
php-mysql.x86_64
php-odbc.x86_64
php-pdo.x86_64
php-pear.noarch
php-xml.x86_64
php-xmlrpc.x86_64
  • removes the 16 packages above (make sure there is nothing above you want to keep)
    • Check that only the packages above are listed before you press yes
yum remove php php-*

Protecting websites using .htaccess

Submitted by siteadmin on Tue, 08/17/2010 - 20:09

Resources:
http://www.reallylinux.com/docs/htaccess.shtml
http://www.javascriptkit.com/howto/htaccess3.shtml

upgrading phpMyAdmin

Submitted by siteadmin on Tue, 08/17/2010 - 16:16

Recent exploits that use phpMyAdmin highlight the need to keep this code up to date. For more info, see:
http://seclists.org/fulldisclosure/2011/Oct/690
http://www.dslreports.com/forum/r24640843-Botnet-Trend-phpMyAdmin-SSH-At...

#first set up the basic info.
#find latest version here: http://sourceforge.net/projects/phpmyadmin/files/
#pma directory--could be: mydir=/usr/share
# using ln -sfn /usr/share/phpmyadmin/ /var/www/html/phpMyAdmin

mydir=/var/www/html  
phpMyAdmin=phpMyAdmin  #could be: phpMyAdmin=phpmyadmin
version="3.5.1"
#test with:
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