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I set up a virtual machine with Ubuntu Server edition.
When I boot it up, the output from the console appears on VirtualBox's virtual screen. This means the machine is wasting resources trying to display output on a screen. It's just a text terminal, I know, but it still requires resources. Why waste them when I'm going to only access remotely through PuTTY?
I know that VirtualBox can start a virtual machine in "headless" mode, but I fear it will just disable VirtualBox's output window, with no real impact on the virtual machine itself.
My questions are:
Will my virtual machine still detect a monitor attached when it runs in headless mode?
If so, how big is the performance impact of this situation? Is there any way to avoid it?
It does not require any additional resources. Just a tty device and a blocking getty process which requires no CPU resources and which has would both have been created anyway. (Every Linux system that I know starts 6 ttys by default).
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My Kali machine is a t2.micro and is responsive when i ssh into it and am able to open it on VNC viewer and is responsive and all, until i open firefox and it becomes practically unresponsive/frozen, and doesnt take any input until many minutes afterwards. Ive seen answers to where i need to update firefox but it is so unresponsive, it is practically impossible. is there a way to fix it or update it through the command line when ssh-ing into it? any help would be greatly appreciated, thank you.
I just want to browse to hackthebox.com for a school assignment, and it wont even allow me to click anything after the web browser opens, it freezes up.
This is probably a resource issue as t2.micro only has 1gb of ram and firefox can hog cpu / memory resources.
I'd try a more robust ec2 instance or you can run through these troubleshooting steps firefox has.
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I installed Ubuntu-20.10 on my computer. So now there are two operating systems on my computer, Ubuntu and Windows 10. But I turned on the computer and found that the computer automatically entered the Windows operating system without entering the selection interface of operating system. And there is no Ubuntu startup item on the boot option in the BIOS.
My guess would be the installer didn't make a boot partition. Could be allot of reasons.
Does your bios have UEFI ? some bios will launch a usb installer not from UEFI with can screw up the installer. other times it's just a wrong button pressed.
usually people have the opposite problem. Make sure your bios is up to date and when installing again check the partition summer before you hit install to make sure its making a bootable partition or including it somewhere.
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Can two linux pc can be use as one signle screen (half in first pc and second half in another pc).Basically can 2 pc's used to see a single movie at same time.
Your screen is controlled by your operating system. So there is no standard way to let on screen be shared by to different OS.
But if you manage a remote connection on your main OS to your seconds OS, for instance by ssh, you can use them with one screen.
Visual tools like TeamViewer, VNC or the Remote Desktop protocol would also enable you to bring the output of a second system to your single monitor.
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i am newbie in network administrator..
One week ago, my server work perfectly. My Server can serves 600++ users at the same time and only use 40% cpu.
Today there is something wrong with my server. My server shows 100% cpu usage when it serves 100 users at the same time.
After i check, i found a process /boot/.IpTables that use high cpu.
What happen with my server? Is my server hacked or what?
This is SS my server process :
OK, looks like your system has been had. I did some googling for /boot/.Iptables, and it appears to be malware.
https://askubuntu.com/questions/407457/help-my-server-has-been-hacked-iptables-and-iptablex-in-boot
https://www.centos.org/forums/viewtopic.php?f=17&t=46704
My personal recommendation would be to take the machine of the network immediately, clone the drive to a USB disk, and re-install (preferably w/ a new set of passwords, and all available patches applied).
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I've installed Ubuntu in a virtual enviroment using Oracle VM VirtualBox Manager and it works great.
However I'd like to enable multiple cores - as seen in the image below my Windows machine has 2 cores:
Now when I run the lscpu in Ubunto I get the following info revealing that only 1 core is being utilized:
I've tried changing the settings of the virtual box to enable multiple processors but it won't allow me to do so as shown in the image below:
How do I enable multiple cores (processors) in my virtual enviroment?
If your VM is currently running (or "Saved") you can't change that value.
Apart from that several sources like this one suggest, that you need need to enable "VT-x" under the Acceleration tab to get this working. I couldn't reproduce that, it works for me without having VT-x enabled.