LinuxHostingSupport

“phpMyAdmin: Cannot start session without errors” is a common error while accessing phpmyadmin on a cPanel server. The problem relates to either of the following listed issues OR both

a) session.save_path parameter is not set properly in the phpMyAdmin configuration.
b) Ownership of the ‘phpmyadmin’ directory is incorrect.

1) To set “session.save_path”,  edit the phpMyAdmin configuration file

# pico /usr/local/cpanel/base/3rdparty/phpMyAdmin/config.inc.php

Search for the parameter and set the value to /tmp

session.save_path =  /tmp

2) To correct the ownership of the directory, goto /var/cpanel/userhomes directory and execute

# chown cpanelphpmyadmin.cpanelphpmyadmin cpanelphpmyadmin -R

Once the issues are corrected, open phpMyAdmin in a different window ( to eliminate cache problem) and it should work fine.

How to add multiple IPs on an Ethernet network interface card i.e. eth0? OR

How to add additional IPs on a Linux server?

People find it rather hard to add the IPs manually on a Plain server. Following are the steps you can follow to add a range of IPs on a CentOS server:

1 ) Change directory to /etc/sysconfig/network-scripts/ using the ‘cd’ command:

cd /etc/sysconfig/network-scripts/ (this directory contains Interface configuration files)

2) Create a file ifcfg-eth0-range0 using your favorite text editor like ‘pico’

pico ifcfg-eth0-range0

3) Add the following lines to the file:

IPADDR_START=1.1.1.10
IPADDR_END=1.1.1.20
CLONENUM_START=1

where,

IPADDR_START is the first IP in the range.
IPADDR_END is the last IP in the range.
CLONENUM_START=1, where 1 will start adding IPs from eth0:1

4) Save and exit the file.

5) You now need to execute “ifup-aliases” script for the range of IPs to take affect. Execute the following command:

./ifup-aliases eth0

This will add the IPs on eth0 and will bring all the virtual interfaces up. You can view all the interfaces using the “ifconfig” command.