On most heavy usage servers, you probably need to override the maximum open file descriptors in order to handle the load! Do not play with this setting blindly, make sure you know what you’re doing! In most case, you will be warned in log wit message like this : Too many open files You may… Read More »
You may get into trouble if you didn’t remove folder synchronization on network server before deleting a user account or unlink a computer from domain… File synchronization still effective even if the user is no longer on the computer or Active Directory. The only way to get rid of old entries, is to do it… Read More »
Inside system logs (/var/log/messages), you may see some message like this on a system running a RAID controller (this one is from a PERC 5/i on a Dell PowerEdge server) : mptbase: ioc0: WARNING – IOC is in FAULT state (1600h)!!! mptbase: ioc0: WARNING – Issuing HardReset from mpt_fault_reset_work!! mptbase: ioc0: Initiating recovery mptbase: ioc0:… Read More »
Need to show full hardware contained inside a Linux machine (board, cpu, memory, pci slots, etc.) such as you do on Windows with AIDA, Sandra, etc? Hardware Lister (lshw) is the answer. http://ezix.org/project/wiki/HardwareLiSter [official site : external link] You can shot the full output using the command lshw Or redirect the listing in a plain… Read More »
Here is how to change the default display name format for user and contact objects in Active Directory. By default, it display “Last name and First name”. We want to revert this to “First name, Last name”. Before doing this step, make sure your user is a member of either “Enterprise Admins” or “Domain Admins”… Read More »
Windows 7 Home Premium doesn’t have the “Local Security Policy” console (aka : secpol.mmc). In order to access SMB share running the old protocol version, you need to enable the Authentication LAN Manager directly inside the registry. Open the registry editor (Start > Run) : regedit Browse to : HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa Create a new DWORD value… Read More »
This tutorial is about partitioning a USB external hard drive as good for internal drive. First, list devices on your system using one of the following commands : dmesg (USB drive should appear as SCSI drive) fdisk -l | grep ‘^Disk’ Now, assuming your new drive is “sdb”, use the following command to invoke the… Read More »
Working in Active Directory Users and Computers (ADUC) trying to delete an Organizational Unit (OU), you get the following error : Active Directory Domain Services You do not have sufficient privileges to delete < Organizational Unit >, or this object is protected from accidental deletetion. By default, you need to uncheck the box “Protect object… Read More »
This tutorial is about generating a SSL certificate to secure POP3 and IMAP communications between clients (MUA) and Qmail server (MTA). 1. Go to Qmail config directory : cd /var/qmail/control 2. Generate key : openssl genrsa -des3 -out servercert.key.enc 2048 3. Decrypt the key (get rid of the passphrase) : openssl rsa -in servercert.key.enc -out… Read More »
Having this issue on Linux machine trying to run command as a user who require /proc filesystem (such as top or htop) ? [user@server ~]$ top top: /proc is not mounted, required for output data [user@server ~]$ htop Error: could not read procfs (compiled to look in /proc). This usually happen because /proc lose… Read More »