Installation :: Use Multiple Ramdisks ?
May 12, 2009
Im in trouble with my ramdisk, because its to small for my application i want to cross-compile for an embedded system. in fact i have only a precompiled kernel and cant change the settings of the kernel. the kernel is configured for ramdisks with a maximum size of 20MB. i have a montavista toolchain but dont have a montavista distribtion, because its a way too expensive.
So .. the question. i want to try if its possible to use multiple ramdisks for my embedded linux. one ramdisk as root i already have. and the other as partitions or sth. if i start the kernel with exec 0x01600000 -c ".. root=/dev/ram initrd=.." it only boots with the given ramdisk. whre can i apply a second ramdisk to use as extra filesystem to gain more usable space? is this possible?
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May 2, 2010
I use two ramdisks one mounted in /tmp the other mounted as /ramdisk /tmp is used as a temp store for apps which need temp space /ramdisk is used to store copies of read only databases for processing. Files in here can be 10-500Mb in size.
I suspect that the O/S may be caching the files stored in /tmp and /ramdisk and thus is not efficient. How can I check if the O/S is caching ramdisk files and if this is the case how can I prevent it? Is there an option to say 'dont cache /tmp' ?
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Dec 30, 2010
I know that an initial ramdisk contains drivers and modules required for accessing hardware before the root partition can be mounted. If the initial ramdisk is stored on the root partition, then how is it accessed, if the initial ramdisk is required to mount the root partition? Wouldn't statically compiling the drivers required for accessing the root partition defeat the purpose of the initial ramdisk?
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Mar 8, 2011
Using Linux, when I boot I automatically have 16 16MB ramdisks, however, I would like to create one really large ramdisk to test some software.I found that I can adjust the size of the ramdisks already on the system with the kernel boot parameter ramdisk_size however, this makes all 16 ramdisks (/dev/ram0 - /dev/ram15) the size that is specified. So if I want to create a 1GB ramdisk, I would need 16GB of memory.Basically, I want to create one 10GB ramdisk which would be /dev/ram0. How would I go about doing that? I assume there is a kernel boot parameter, but I just haven't found it.
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Oct 26, 2010
I'm trying to connect one computer to two others in an ad-hoc infrastructure.
[computer 1] ---- [computer 2] ---- [computer 3]
computer 2 is running Linux and has a single NIC wlan0. I want to it to connect to both computer 1 and computer 3 so each computer can talk to the other. No switch is available so it needs to be an ad-hoc setup.
[Code]...
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Aug 23, 2010
I am to rename all the files within a directory (which contains multiple subdirectories) recursively without invalid characters.
I tried the coding posted above.
find . -type f -printf '%p
' | while read file; do
oldfile=$(basename "$file")
newfile=$(echo "$oldfile" | sed 's/[^A-Za-z0-9_.]/_/g')
if [ ! "$newfile" == "$oldfile" ]; then
echo mv "$file" "${file%$oldfile}$newfile"
code....
but I get an error on both of them stating "find: bad option -printf find: [-H | -L] path-list predicate-list"
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Jun 4, 2010
I'm starting to have A LOT of opened windows in my machine. Sometimes within a project, I have e-mail/task management/personal e-mail/twitter, and a lot of different opened applications/terminals in my Linux workstation.Sometimes it would be interesting to have different workspaces to projects instead of this configuration I have nowadays that are classes of work (bad name, I know, but I think you got the idea).I'm starting to think about using two monitors: one with Corporate Management, Work and Personal. The second monitor is only the development state: each workspace here is about a project being worked on instead of groups of works like before. A workspace may be implementing different classes for example.
My question is: I just want to change to a second monitor using the mouse. I want to still be able to change workspaces in the same monitor using keyboard shortcuts. The keyboard shortcuts wouldn't change monitors, just worskpaces on the same monitor. All the tutorials I read (like this one) only tells how to use multiple monitors but doesn't answer my question about keyboard shortcuts.Does Linux (Ubuntu 10.04 Lucid Lynx or Debian 5.0.5 Lenny) support this envisioned setup (Different workspaces in a way that keyboard workspace switching only works in the current monitor) ? If so, how?I haven't tested this setup, that's why I'm asking. In this question the user says it works exactly how I want it to behave, can someone else confirm it?
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Aug 4, 2010
We are working on a project to create a display wall of 8 monitors arranged as 2 high by 4 wide. Each monitor is connected to a single machine and all machines are networked with a master machine with its own, seperate monitor.
Our goal is to get the 8 machines to share a single desktop, with the master machine acting as the server. We have looked at using Xinerama or NMM, but we are unsure about how to get started configuring the multi-machine, multi-head display.
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Sep 24, 2010
My ubuntu 10.04 has two monitors connected both being treated as individual desktops.But only one desktop is showing the wifi network icon in the notification area.Is it possible to have more than one wifi icon going at one time?
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Jan 12, 2011
I'm using Ubuntu 10. I want to apply different themes for desktops.. I want to apply windows 7 theme,ubuntu, mac os themes for my multiple desktops
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Jun 14, 2011
have a large amount of 7z files in multiple folders which I need to extract.The directory structure is like this:
/main-folder/
multiple subfolders/
1 or more 7z files per subfolder
I would like to get the output of this action in one separate folder, all together in 1 folder.How can I do this?
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Aug 20, 2011
I often use the rpl command to make changes to multiple html files at once. For example:
rpl -R '<br />' '<br /><br />' mydirectory However, I haven't been able to figure out how to change multiple lines. For example, let's say I want to change all occurrences of :
<br />
<br />
to:
<br />
I've tried
rpl -R '<br />
<br />' '<br />' mydirectory
but that didn't work. how to do this with rpl or some other way?
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May 20, 2010
I have an old pentium 3 computer that has ~7 NICs installed. These NICs are attached to modems and other networking equipment. According to the linux ping page on computerhope.com, it seems that one could send a ping from a certain specified NIC. How would one go about this?
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Feb 7, 2011
I'm looking at setting up a couple automated systems: Here are a few examples:
* Internal accounting system to download and process emails
* Public web server to visit
I could put each system on its own separate box -- for example, it's generally good practice to separate anything that external users have access to (such as a webserver) from internal processes such as accounting. Now, rather than dishing out the money for two separate servers, could I get away with just installing new instances of VMWare on the same box for each system?
To give you an idea, these are not large scale computationally sensitive systems. The accounting one is simply downloading and tallying emails, and the latter is just a webserver with maybe 5 hits per day on a good day. I could definitely pick up a new box for say $50, but I wanted to know the general practice of using VMWare on the same box versus two separate boxes.
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Dec 16, 2010
How to search multiple words in multiple lines, inside a directory including sub-directory? Pls. give easy example. I want to search the files (in /xx folder and all subfolders) that have header.h included and used x() function. I tried $grep -r "header.h" | grep -r "x(" /Folder/subfolder/ > search.log
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Jun 16, 2009
I have a CentOS 5.3 box with three network interfaces in it. Each interface is attached to a separate VLAN and I want traffic to stay on each network segment.What I can�t figure out is why I cannot get each interface to have its own gateway and everything gets sent through the default gateway.The basically takes my possible 3Gb total bandwidth and throws it down a single 1Gb pipe.Then on top of that, if I take down the interface (ifdown) that has the current default gateway,I loose contact to the other two interfaces.When I look at the routes, each one of the interfaces shows the gw as 0.0.0.0 and defers to the default route. So I delete the route and try to add a new route with:
[root@testsan ~]# ip route add 10.1.15.0/24 via 10.1.15.1 dev eth2
but end up with the error:
RTNETLINK answers: Network is unreachable
[root@testsan sysconfig]# cat network
NETWORKING=yes
NETWORKING_IPV6=no[code].....
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Oct 4, 2015
What is the best way to setup for a number of very different distributions of Linux on a single machine/HD? Can multiple systems use the same oot partition? That seems to be the bottleneck. Only 3 primary partitions possible on a single HD, allowing for all other partitions under an extended partition.
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Jun 16, 2009
My system already has Winxp, Vista and Ubuntu. I'd like to try F11 on my system with about 50 GB free space. How do I set up the installer so that it will install F11, configure the boot loader to recognize all (multiple Oss) so I can load any one of them? I know Fedora has no problem to boot winxp and Vista, but how to set things up so it can also boot other Linux OS on the same system?
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Mar 18, 2009
i am new in Linux. i have two drives one IDE and other SATA in my computer.i want to keep windows XP , WIndows 2003 server on one drive and two flavours of linux on the other drive, let say oopen suse and redhat.please help me how i install these sofwares to make multi boot the machine.
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Feb 26, 2015
I installed Ubuntu recently and decided I didn't like it so I went back to Debian. One problem is I now have 2 Grubs installed. One is Ubuntu's that comes up first and then the Debian Grub. To bypass the Ubuntu one I hit F9 (I have an HP computer) which takes me to OS selection. Debian is the only OS installed but the Ubuntu Grub still lingers. This person had a similar problem: [URL] ....., but didn't receive info to get rid of Ubuntu's Grub....
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Jun 25, 2015
I have given up (for now, at least) the idea of a raid solution but I will still have 2-3 hard disks available for my workstation. If I choose to reinstall from scratch,can I have essentially two different homes?
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May 8, 2010
so I get my t410 today. the hdd is 250g with three primary partitions: 1) 1.17g 2) 221g win7os and 3) recovery 9.7g. I plan to install a windows vista, opensuse 11.2 and fedora 12. I know first to shrink the partition to make room. but i still don't know exactly. say, i shrink win7os partition to 40g and create an extended partition of 221-40 =181g, and then add partiton /boot, /swap, /home, /... and a number of partitons for vista and a number of similar partitions for fedora. But I doubt I wouldn't be able to install vista when opensuse installation is done.
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Nov 22, 2010
I installed Fedora 14 in a dual boot with Windows 7 (Win 7 came preinstalled on my Vaio, I freed up 30 GB on a hard disk drive and installed Fedora in it).The first reboot took me straight to Windows. I could not find a way to get multiple Operating systems, so I tried looking on the net a bit, and installed EasyBCD. This gave me the option of choosing the boot up OS. But when I choose Fedora in the options, the screen changes to GRUB4DOS which lists Fedora and Other as my two boot options.Selecting either one of these options results in Error 22 No partition found.
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Mar 17, 2010
After I messed up badly with my netbook I have to reinstalll the OS, it is a government property netbook that came up with Edubuntu 7.04 insalled on it. I shouldn't mess with the filesystem but I did and now I have to install Edubuntu from the beginning, but I must be sure that everything will just like I have done no change, so I am afraid that I can make some mistakes at this pointThe first thing that I want to know is: Why there are multiple kernels listed at the GRUB (v 1.5)...this is the full list:
Ubuntu, kernel 2.6.28.9 Default
Ubuntu, kernel 2.6.28.9 Default (recovery mode)
Ubuntu, kernel 2.6.28.9
[code]....
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Mar 24, 2010
I need to test my code under different versions of GCC. At leat GCC 3.4 in addition to the default. I was hoping I could simply do the switch from CodeBlocks's build settings... Of course, it's not that simple.
By the way, GCC 3.4 is not even in synaptic manager. I suppose some apt-get install command can do it.
ideally I'd like to be able to switch between versions. I've heard of ccontrol, but I'm cautiously posting here before for any advice before blowing up my set up.
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Mar 27, 2010
I want to be able to install multiple operating systems on a disk setup with LVM. I am uncertain as to how to go about this.I read somewhere that you can do it, but that only one /boot partition should used for all systems(they are all linux).get going on this? Do I boot from an installation disk and follow that path some how...or is there some other method I should be following? And how do I use one boot partition for all OS's? I had a problem with this once before..so need to ask, especially with the LVM thrown in the mix.
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Apr 24, 2010
I dual boot multiple distros of Ubuntu and I'm trying to use my /home from 9.10 for 10.04 also.Is this possible? If not, does anyone know if I can copy sections of my 9.10 Crossover files to my 10.04 /home. Biggest thing is for WoW which takes forever to load each new distro I upgrade to.
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May 10, 2010
I have (after upgrading from 9.10 to 10.04) several packages who are installed with multiple versions.
e.g. Python
dpkg -l | grep python2
ii libpython2.6 2.6.5-1ubuntu6 Shared Python runtime library
[code]....
I guess I only need the newest one .. The other ones have status "RC" Or am I wrong here, and do I need to keep these old versions ?So how do I get rid off 2.4 and 2.5 and just keep version 2.6.How can I easily remove these "old" packages. I tried aptitude purge, aptitude clean, aptitude autoclean. But they don't do the trick.I am looking for an easy way, because python is only an example. Else I could just delete them be using their name.... (of course)
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Oct 18, 2010
I'm currently running Ubuntu 9.10 on my server and I want to install a new 10.04 from scratch in a second bootable partition to be able to boot it up and test the new version before putting it into production (without tampering with my old version). I have an empty partition on my drive already
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Nov 16, 2010
I have a 1 tera byte disk with windows xp nad a 120gb disk with ubuntu 7.10. I used install CD to install 10.04.
Now two versions of ubuntu are running and is creating confusion. How to remove the old version?
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