SIMULATION
Configure NTP.
Configure NTP service, Synchronize the server time, NTP server: classroom.example.com

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Create a collaborative directory/home/admins with the following characteristics:
Group ownership of /home/admins is adminuser
The directory should be readable, writable, and accessible to members of adminuser, but not to any other user.
(It is understood that root has access to all files and directories on the system.) Files created in /home/admins automatically have group ownership set to the adminuser group

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How does Vagrant run virtual machines?

• A.Vagrant ships with an embedded version of VirtualBox.
• B.Vagrant generates virtual machine images but does not provide a mechanism to run them.
• C.Vagrant uses so-called provides which control external hypervisors such as VirtualBox.
• D.Vagrant has to be run within a running virtual machine which is not controlled by Vagrant.
• E.Vagrant uses a vagrant-specific hypervisor called VagrantVM.

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Open kmcrl value of 5 , and can verify in /proc/ cmdline

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Upgrade the kernel, start the new kernel by default. kernel download from this address:
ftp://server1.domain10.example.com/pub/update/new.kernel

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