A few utilities are available to test the disk I/O performance. The easy way to do it without installing anything on the system would be running this simple command : time dd if=/dev/zero of=/tmp/test-hd bs=1M count=1000 Another, more complete tool I recommend is “SysBench”. http://sysbench.sourceforge.net/docs/
Lost your root password for MySQL? Follow this simple procedure to reset it. Of course, you need at least root access level on your operating system to proceed. 1. Stop MySQL database server : /etc/init.d/mysql stop 2. Start MySQL with “skip grant table” option : mysqld_safe –skip-grant-tables & WARNING! This is VERY insecure – while… Read More »
To detect if there is a link or not on network interface without any physical intervention, simply run the following command : cat /sys/class/net/<interface_name>/carrier This command should return ” 0 ” or ” 1 “. Of course, 0 mean disconnected and 1 connected.
Microsoft RDP (Remote Desktop Protocol) use the standard TCP-3389 port. To change this port to non-standard, there is no GUI to achieve this. You need to manually edit the registry to proceed. 1. Open the Registry Editor : Start > Run Enter “regedit.exe” *You may directly type this command in the Search bar at the… Read More »
If you have a full subnet to add on RHEL/CentOS Linux system, there is a short way to achieve this instead of manually create single alias interfaces. 1. Create a script at this location : vi /etc/sysconfig/network-scripts/ifcfg-eth0-range0 (ajust values as needed, according to the interface you would would have the IP subnet binded to an… Read More »
Without any reason, IIS may stop responding and eventually, fail to start manually or automatically. You may notice the following message in the EventViewer : Cannot start a new logon session with an ID that is already in use. This is because a core dll file (qmgr.dll, which is Background Intelligent Transfer Service) is no… Read More »
Basically, we’ll use the “netsh.exe” builtin utility here to achieve theses tasks. Show TCP/IP settings : netsh interface ip show config Set the interface as DHCP : netsh interface ip set address “Local Area Connection” dhcp Set interface DNS server address : netsh interface ip set dns “Local Area Connection” static 0.0.0.0 Export the current… Read More »
Using Xcode on Mac (with MacPort as example) may end up with the following error : Warning: The Command Line Tools for Xcode don’t appear to be installed; most ports will likely fail to build. Once Xcode has been installed, you need to manually install the Command Line Tool from the Xcode Download Component preference… Read More »
You may noticed a foot note near the clock that display something like this : Test Mode Windows Server 2008 R2 Standard Build 7601 There is a workround to get rid of this message (UAC must be disabled to run this command) : bcdedit.exe -set TESTSIGNING OFF After rebooting your machine, Windows won’t boot and… Read More »
If you’ve done a Basic/Minimal OS install on RHEL/CentOS Linux, setuptool (which could be invoked typing “setup” in terminal), this tool is probably missing on your system. To install it via Yum repository, simply type the following command : yum install setuptool system-config-securitylevel-tui authconfig system-config-network-tui ntsysv There is a description of each packages : setuptool… Read More »