Install guest additions

- [Instructor] VirtualBox Guest Editions are pieces of software installed on the guest's operating system that gives the guest OS a direct communication path to VirtualBox. This allows the guest to take advantage of faster drivers, better screen resolutions, and better integration between the guest and the host. I highly recommend installing Guest Editions, as it makes the virtual experience smoother. When running a VM, you may notice if you press Host plus F to go into full screen mode that CentOS doesn't fill the entire screen. Installing Guest Additions will fix this, among other things. There are a few prerequisites for installing VirtualBox Guest Additions. All CentOS system updates have to be done and the VM has to be rebooted to ensure CentOS is using the latest kernel. Also, the network needs to be functional. To update the system's software, open a terminal in your VM by selecting Applications, Favorites, and Terminal. I'm going to make mine full screen. I'm going to bump my font size. Now type in sudo space yum space dash y space update and hit Enter. Then type in your password. There's a chance that the yum database may be currently logged. If so, you need to kill the other yum process, which is listed in the error output. In this case, you'd type in sudo space kill space dash nine and the process ID listed in the error output, and then you'd run the yum update command again. In my case, the update is going well, and I only have one package to update, which is the kernel. When the updates are done, reboot by typing in sudo space reboot, and hit Enter. Type in your password. Once the VM has rebooted, log back in and open a terminal. Now let's install the development tool software group by typing in sudo space yum space group space install space dash y space dash dash setopt equals group underscore command equals objects space double quote Development Tools double quote, and hit Enter. Type in your password. Hit Enter again. Due to a change in the way software groups are handled in CentOS 7, we need to add the dash dash setopt option listed above. In your case, it may work without it. We need the double quote so yum knows we're installing one software group called Development Tools. When that's done, we'll need to install the kernel source. Type in sudo space yum space install space dash y space kernel dash devel, and hit Enter. After yum has finished installing the kernel source, we can close the terminal window. Now let's go to the Virtual Machine menus. If you're in full screen mode like I am, then you'll need to press the Host key to release your mouse pointer and then hover it over the bottom of the screen. The menu bar should show up. If you're not in full screen mode, you'll need to press your Host key and then click on the menu at the top of the window. Select Devices and Insert Guest Additions CD Image. Once the dialogue pops up, click on Run. Type in your password. Once we've authenticated, it will start installing Guest Additions. The installer is taking the development tool software and is compiling a module for the Linux kernel and then installing it, which should finish in a few moments. Now that the Guest Additions software is installed, reboot your VM again by going to the top right hand menu and selecting the power button. Then click Restart. Once it has rebooted, log in and you should be able to go into actual full screen mode by pressing Host key plus F. If your VM rebooted okay and your Guest Additions installed successfully, you'll want to create a new snapshot. With our VM running, press Host plus T to create a new snapshot. We'll call this snapshot Guest Additions and hit Enter. You'll want to follow the same procedure for each of your Virtual Machines.