Trying to update BIOS on Dell PowerEdge server running CentOS Linux may fail to complete with no further explanation even if all software requirement has been met do do the upgrade from the OS. This is because Dell does not recognize CentOS (which is a 100% RedHat binary compatible) as a supported OS (such as… Read More »
To increase (or decrease) the size of allowed uploaded file size with PHP, using php.ini or .htaccess file, just add or edit the following values : php_value upload_max_filesize <VALUE> php_value post_max_size <VALUE> Just add the amount instead the <VALUE> tag. Let’s assume you want to allow 300 megabyte file size to be uploaded to the… Read More »
When installing and configuring Zimbra for the first time on RHEL/CentOS 6, it return that LDAP failed to initialize and then the config script exit. The log file probably indicate the following error : Initializing ldap… *** Running as zimbra user: /opt/zimbra/libexec/zmldapinitsudo: sorry, you must have a tty to run sudo IO::Socket::INET: connect: Connection refused… Read More »
VMware Server performance can be improved in so many ways… there are some recomendation that I’ve discovered when I was using this product at large before moving them to ESXi : Use preallocated virtual disk Use as less virtual hardware as possible – do not add unneeded hardware Use ext4 or XFS filesystem (if host… Read More »
VMware allow four type of virtual disk (vmdk) : 0 : single growable virtual disk 1 : growable virtual disk split in 2Gb files 2 : single preallocated virtual disk 3 : preallocated virtual disk split in 2Gb files vmware-vdiskmanager -r <source-disk> -t <type> <target-disk> Now, if you want to convert your growable disk into… Read More »
Do the following to find and replace text string in a whole file using the Vi text editor : 1. Enter in command mode by typing ” : ” 2. Your command should look like this : :%s/search_for_text/replace_with_this_text/g NOTE : To search & replace a string containing slashes ” / “, use a coma ”… Read More »
In some rare circumstances, your system may boot without network interface and you discover the following message in dmesg : udev: renamed network interface eth0 to eth1 Since RHEL6, kudzu is no longer available since the kernel and udev take care of hardware changes. So, you need to modify using udev to get back you’re… Read More »
To add a static route in Mac OSX, do the following as root in the terminal : route -n add “network/prefix” “gateway” Example : route -n add 10.0.0.0/8 10.16.1.1 To print the routine table, use the following command : netstat -nr
MacOSX run a local named caching server. In some reason you may need to refresh it manually to get a resent updated DNS record. Under Mac OSX 10.8 and above, use the following command using the terminal : sudo killall -HUP mDNSResponder Under Mac OSX 10.5 and 10.6, use : sudo dscacheutil -flushcache Under Mac… Read More »
To permanently disable local dns server on a MacOSX Server simply run the following command as root : sudo /bin/launchctl unload -w /System/Library/LaunchDaemons/org.isc.named.plist You will be prompted to enter the administrative password next and you’re done!