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Hey guys and welcome back. Now in the previous nugget we had talked about Grubb Legacy and

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we did mention and I suppose the name will give you a little bit of a hint that Grubb

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Legacy is Legacy and it's not the most updated version. We now have Grubb 2 and this is really

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what we're going to be seeing on modern Linux based systems. Now the reason why is that it

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does bring with it several improvements. One of the improvements it brings is the fact that it

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has UUID support which makes things much much easier and it handles our Grubb configuration

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file and the generation of that configuration file any more programmatic way. Simply put,

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Grubb 2 just is easier to use and much better designed. Now with respect to Grubb 2 we do

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have some particular locations that we do want to be aware of. Now the first location we want to

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check out is in the Etsy directory and in the Grubb.D directory within that. What you're going to

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find within this directory right here are a whole bunch of templates and another very important

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file is also within the Etsy directory but it's going to be Etsy defaults forward slash Grubb. Now

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one thing to note here is that see this file right here in conjunction with the templates and the

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Etsy GrubbD directory. They are actually used together to generate a Grubb.Cfg file. So with the

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Grubb legacy you would just go in and modify the Grubb.Cfg file directly. In this case here we do

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not modify the Grubb.Cfg itself. If we want to make changes to what will ultimately be our Grubb

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configuration file we want to do it via modification of those templates within the Etsy Grubb.D

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directory or the Etsy default Grubb file which contains some very particular settings. So let

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me actually show you the templates as well as our settings file that will be used to generate this

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Grubb configuration file. Okay so if we go in to the Etsy directory and then into Grubb.D if we do

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an LS we're actually going to see these configuration template files. Now we can actually go in and

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look at these if we so choose. Let's go into maybe say Debian theme so 05 and hit enter and we can see

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what we have in here. This is ultimately a long bash script. Okay so if we escape out notice we

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have these custom templates. Now these are the files we would like to be editing. If we want to

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create some custom menu entries remember we talked about the Grubb menu file earlier on and the

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previous nuggets. If we want to generate new entries we could do so by amending to this custom

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file right here this custom template so to speak. Now this is just one location that we have to

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check like I say we also want to be looking at the default directory and within here we will have

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this Grubb file. Okay so let me go in here so nano Grubb and we can see here this is a settings

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file and like I say this is going to be used in conjunction with the templates we see in the

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Etsy Grubb.D directory. Now what we are actually looking at here is not too dissimilar to what we

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talked about in the previous nuggets. Remember we talked about a default value with respect to the

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options within our Grubb menu. The 0 being the option at the very top and if we happen to change

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this to the number 1 that would mean we were choosing the second from the top. This is the same

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type of deal this time though for Grubb 2 so we use the Grubb underscore default option and if we

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want to automatically select the option at the top once that timer has elapsed we would leave

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that value at the value 0. However if we wanted to choose the second from the top by default once

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the timer elapses we would change that to the value 1 so on so forth. Now the next value we

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can see here is the Grubb timeout style we have the value hidden. This is similar to what we saw

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before when we talked about the hidden menu option with respect to the Grubb legacy. When we have

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the Grubb timeout style set to hidden the title menu is not going to be displayed during the actual

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timeout countdown. Now the Grubb timeout we have right here again we can change this value if we

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choose this is how many seconds should we wait before we actually boot to the default. Now right

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now we have the value at 0 which means that we're not going to wait at all. If we wanted to modify

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this we could change this to 5 which would be 5 seconds or 30 which would be 30 seconds or if we

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so choose we could actually set the value to negative 1. Now what this would actually mean is

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that we would wait forever we would actually not count down and then load in a default option instead

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we would actually require that the user is explicit and chooses the option because quite simply we

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would just wait and wait and wait until they did so. Now we can see some other options here we can

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see Grubb command line Linux this is if we want to pass in additional parameters to the kernel

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such as the RHGB option that we talked about in the previous nuggets which would be the red hat

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graphical boots and if we wanted to use this with the quiet option we could also pass in the value

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quiet and we can also see the Grubb command line Linux defaults and as we can see here we're passing

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the values quiet and splash so quiet to suppress the output splash to actually get that splash menu.

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Now like I say this settings file in conjunction with the templates found in our Grubb.d directory is

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going to allow us to generate this Grubb.cfg.config file now as it stands right now if I just do

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a clear and I go to my boot directory we do an LS I have this directory here called Grubb now some

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distributions may actually have a directory called Grubb2 but on my Ubuntu machine or my

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Zubuntu machine this directory is just called Grubb now within here this is where the Grubb.cfg

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file is going to be located so if I actually go in and look at this file right here notice this

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file looks much much different from the configuration file I talked about in the previous nuggets this

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is much more programmatic and like I say it's going to be pulling from what we find within that Grubb.d

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directory and the settings in our XA default Grubb file now what if we wanted to change this Grubb.cfg

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file ie we wanted to modify some of the values within this directory here our configuration

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templates or we wanted to modify the actual settings within this file right here how would we

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actually generate that new file well let me show you what I can do here okay so like we can see

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here we do have this Grubb configuration file if we wanted though to generate a new configuration

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file from our templates and from our settings file how could we do such a thing well first we

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would make a modification that we wanted to implement either within one of our template files right

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here or alternatively we could go into our settings file right here so let's say I would change the

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Grubb default value from 0 to 1 and maybe the timeout will change it to 5 seconds so I'll save

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this and I'll push X so now what I will do is I will actually go to my boot menu so here we are

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and I have a command that I can use to generate this configuration file now be careful this

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command is actually different if you're using a Debian based system or a Red Hat based system if

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we are using a Debian based system the command is going to be Grubb-MKconfig and if you're on a Red

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Hat based system that would actually be Grubb2-MKconfig but like I say I happen to be on Ubuntu

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which is derived from Debian so I will use Grubb-MKconfig and I'll just say dash 0 to specify

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the output file that I'm going to generate and I'll just call this my new Grubb stuff touch CFG

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and if I enter now nothing is going to happen because I have to run this as root of course so I'll

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try this again and now we're going to generate this new configuration file if I do an LS we can see

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here we have now generated this new file here again pulling from those two different locations so now

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I could go in and have a look at this file that I have generated we can see all this programmatic

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stuff has been automatically generated okay let's go back and what I would do is I would actually

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move this file into the same directory as my Grubb configuration file which is in this directory

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here this might be Grubb2 for you okay so I've moved it in I go into this directory now we can see

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the Grubb configuration file and my newly generated one ultimately I would back this one up and I

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would rename this one the new one Grubb.Cfg and if I wanted to install this I could use my Grubb

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install command and then specify the location of where I want to install this now one thing I really

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do want to get to though and what I'll do is I'll actually terminate my SSH session right here and

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I'll just go directly to my virtual machine now what I'm going to do here is to restart my system

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and I'm going to try to access the Grubb menu now depending on whatever system you're using the way

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you do this may vary on my Windows machine the key the time going to press is the escape key you might

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be on a system whereby you might have to press the shift key so if you're having trouble doing this

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like I say there may be some variation you may have to do a little bit of googling to get the

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correct key for your system so what I will do here is I'll press restart and I'll press restart and

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I'll hit the escape key so now this brings me to this menu right here okay now what I'm going to do

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is I'm actually going to choose advanced options for Ubuntu and click this now if I try to full

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screen this it's not going to show the full screen unfortunately so I'm just going to change the view

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to scaled mode so it might look a little bit pixelated I do apologize now down the bottom here

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we can see we have these different options if I press the letter C this is going to bring me into

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a command line interface and as we can see here this is a minimal bash like interface and this is

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a prompt you may be presented with if you happen to have a severe issue on your machine now if I

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do the command ls we're actually going to see information relating to our disk so I can see

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HD 0 here that denotes the first disk ms-dOS 5 this is actually my partition information this is

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going to be sda5 so to speak this happens to be where my file system is mounted and this part here

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this is where my boot is mounted so if I actually happen to do ls and I select my root file system

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so I'll do HD and I can select ms-dOS 5 but I can just select the value 5 okay if I hit enter here

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it tells me the file system type ext we get the uuid as well as some basic partition information

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now if I happen to choose the forward slash for the root file system watch what happens see this

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this is just like what we see on our Linux base system here are all of our folders see this lost

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and found boot swap file say for example home so if I arrow up and I choose home we can see the IPv0

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folder so I can go into IPv0 we can see all my downloads and desktop folders so on so forth so

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we can still navigate our file system now you may recall when we talked about our grub legacy

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configuration file let me just bring this back up do you remember these settings here roots kernel

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and knit rd well we want to ultimately do a similar thing right here but there is a little bit

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of variation one thing to note here is that this option here kernel this is going to look a little

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bit different when we're using grub 2 the value is going to be the word linux not the word kernel

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so I'm going to say set root and give it a particular value but as opposed to saying set kernel I'm

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going to say linux and then give the name of the kernel as well as where the root file system should

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be mounted whereas the init rd value this is going to be the exact same so the only real variation

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here is going to be this value here kernel will be instead the word linux so if we want to see what

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our values are right now we can just type the command set and this will show everything that we have

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already set so we can see here the roots right here is the hd0 ms dos 5 that is the disc and the

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partition and if we actually want to be able to see this a little bit better I will just set the

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pager value to 1 and I'll now say set now I can just spacebar down so we can see the very top and

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hit spacebar to scroll down okay so let's actually type in these three values the root value the linux

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value as well as the init rd value so I'll just say set roots equal to and I'll just say hd0 and I

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can say ms dos 5 but I'll just leave it at 5 so if I hit enter that would be that value set now like

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I say I'm actually not changing any particular values the values I have happen to be working I'm

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just showing how you could actually change these values if you needed to now like I say we have to

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specify where the kernel is and where we should mount the root file system we're not going to use

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the command kernel instead we're going to use the command linux now whereabouts is the kernel image

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found it's found within the boot directory and all the images are going to start with vm lin if I do

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vm lim and hit tab we're going to see all the options the one that I'm going to choose is the one I'm

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already using right now which is vm linux 5 13028 and I can tab this out and I have to specify where

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the root file system is going to be I'm going to say root is equal to forward slash dev forward slash

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sda5 so if I hit enter here that is going to set that value the third value is going to be the init

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rd value now remember just like we talked about the version number here has to match okay so 5

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13028 I have to use the same init rd image so I'll say init rd boot and the image will be init

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rd and I can hit tab we can see I have 5 11 027 that is not the one I want I wanted to match

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this one right here so 5 13028 which is this one right here so I will say 5 dot 13 I can

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tab this out and to enter so that is my three values now set my root value my linux value and my

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init rd value I will just hit boots and now it should begin booting up and if you just give it a

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minute I'm now able to log in to my machine so I'll type in my username and then my password

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and there we go so I can just log in and now I have full access back to my system

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I can do a uname dash r we can see this is the kernel I had I didn't actually change anything

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we're going to see debuts to an ls and we can see here this was the image I used for the kernel

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and correspondingly this was the image I used for my init rd again notice that the numbers

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happen to match 5 13028 and 5 13028 matching correctly so clearly I happen to force myself

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into the grub menu but if you happen to find yourself in that unfortunate situation where

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you try to boot up and it automatically loads in you know the settings that you can use to try

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to boot back into your system you want to specify your linux value pointing to the correct kernel

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image as well as the correct corresponding init rd image once you do that you can use the boot

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command and hopefully if all is successful you should be able to boot back into your machine

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okay dox I hope this has been informative for you and I'd like to thank you for viewing