How to boot into recovery mode on mac without holding Command + R Key on keyboard ?

Generally well known method to boot the mac into recovery mode is by holding the Command + R on keyboard while mac is turned on. However you can force the mac to boot into recovery mode upon next reboot by changing the nvram setting. To do that, Run below command.

sudo nvram "recovery-boot-mode=unused"

sudo reboot

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How to find firmware or boot ROM version in Mac OS X

Firmware and boot ROM version of your mac can be found in two ways. Way 1 : 1. From "Apple" menu , choose "About This Mac" menu item. 2. Click " More Info " to open "System Profiler" application. 3. Under Contents -> Select Hardware Tree item. On the right side panel Under hardware overview section, we can see Boot ROM Version and SMC (Firmware) Version. Way 2 : Run the below command in terminal to get boot ROM version and SMC(firmware) version : $ system_profiler SPHardwareDataType | grep -i "Version" | awk -F ':' '{print $1 $2}'

How to enable root login in gnome on Debian 6 or 7

Root user login in gnome is disabled on Debian system by default for security reasons. If you want to enable it for specific reasons then follow the below steps : 1. Login into Debian system 2. launch the Root Terminal from Applications -> Accessories. 3. Authenticate with password to launch the Root Terminal. 4. Open "/etc/pam.d/gdm3" with vi. #vi /etc/pam.d/gdm3 5. Look for "auth required pam_succeed_if.so user != root quiet_success" , comment it out as below. #auth required pam_succeed_if.so user != root quiet_success 6. Save the modification with Esc+w+q+Enter keystroke. 7. Restart or reboot Debian system. 8. Login with root user in gnome. You should be now able to login successfully.

How to setup Redhat cluster and GFS2 on RedHat Enterprise Linux 6 on Vmware ESXi

1) Installing RHEL6 on Vmware esxi with clustering packages . a) Creating a RedHat Enterprise Linux 6.0 Virtual image. i) Open vSphere Client by connecting to a Vmware ESXi Server. ii) Login into your vSphere Client iii) Goto File -> New -> Virtual Machine (VM). iv) Select Custom option in Create New Virtual Machine Window and click Next v) Give a name to the virtual machine(VM) ( In my case name of my virtual machine is – RHEL6-ClusterNode1) and click next. vi) Select a resource pool where you want your VM to reside ( In my case , I have created a resource pool named RHEL6-Cluster.) and click Next. vii) Select a datastore to store your VM files and Click Next. viii) Select VM version which is suitable for your environment.( In my case VM version is 7) and click Next. ix) Specify ...

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