General :: How To See The Content Of The Initrd Image
Feb 8, 2010
i am using rhel5 and i just wanted to see the contents of the initrd image. I have copied that from /boot/grub and saved in /tmp directory. Then i did the following
when i gave that, it says "mount: you must specify the filesystem type" Then i included "-t ext2" option in the mount command. Now it says,
mount: wrong fs type, bad option, bad superblock on /dev/loop0,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
Then i created a ext2 filesystem and did the same thing. But there is no difference.
i am using linux for couple of years. suddenly i a question arises in my mind. Before loading kernel during booting linux box initrd image loads necessary real mount point, file system, modules etc. but how initrd loads them ?? is there predefined modules list stored in initrd image or something else....what is the background procedure of it
But i would like to move to cpio, because with dd, if you add something new, you might need to change the count. Also cpio is used in distro's like Fedora and Ubuntu.
Im trying to build an initrd image for my livecd using cpio -o -H newc, but the livecd can't boot. If I create the initrd image using mkfs.ext2 then it works.
I am attempting to run ssmtp from an initrd image to send an e-mail, via Gmail MTA, upon reboot of the machine. I have already successfully installed and configured ssmtp on the running box (in other words, ssmtp successfully runs after completion of the boot cycle). When attempting to mail something via `echo "Test" | ssmtp username@gmail.com`, I receive the following error message:
I tried compiling linux kernel 2.6.37-rc2 (mainline), Compilation and installation of kernel and modules went fine. After that while trying to make initrd image, I used the following command :-
W: Possible missing firmware /lib/firmware/2.6.37-rc2/radeon/RV610_me.bin for module radeon W: Possible missing firmware /lib/firmware/2.6.37-rc2/radeon/RV610_pfp.bin for module radeon W: Possible missing firmware /lib/firmware/2.6.37-rc2/radeon/R600_me.bin for module radeon W: Possible missing firmware /lib/firmware/2.6.37-rc2/radeon/R600_pfp.bin for module radeon
Actually, "2.6.37-rc2" folder is missing in "firmware".
I install fedora on my usb-hdd. Sometimes i boot it from real machine, sometimes i boot from virtual machine (kvm). When I boot from real machine, hdd driver is usb-storage, when i boot from virtual machine hdd drivers are ata_generic and pata_acpi.
Everytime i update kernel, mkinitrd only create initrd image contains only hdd driver current running, and I must recreate initrd manual with all preload hdd driver. How to config fedora to everytime update kernel, mkinitrd can make initrd image with all hdd driver I need?
I am using find to search for .tgz files modified more than 7 days ago and delete them.find /directory/ -iname backup*.tgz -daystart -mtime +7 -exec rm -rf {} My problem is that find will go through the content of tarball as well and list all content. I want to only search main tarball and delete it if older than 7 days.
When I compile a custom kernel with this command: make-kpkg --initrd kernel_image kernel_headers and then install the .deb, there's no initrd in /boot and I have to create it manually. I've thought that the --initrd option should take care about this, but somehow it doesn't.
It behaves like this for about two years at least (since I've compiled my first kernel). Of course, it's no big deal to create it manually, I was just wondering whether do I do anything wrong or whether should I fill a bug report..
If you have the value 100 in File1 and the value 5 in File2, how do you write a script to divide the 100 in File1 by the 5 in File2 in Linux Bash Shell?The operating system I am using is Ubuntu 10 and object is to write a script to accomplish this task.
I have installed "open-SUSE 11.4" on a "500GB Free Agent External Hard Drive". I didn't have any problem in booting since last week that I booted it from my laptop. Also I did it before several times from then when I try to boot it e.g. from an "Intel(R) Core(TM)2 Quad CPU Q9400 @ 2.66GHz" PC the time between loading INITRD and starting boot sequence messages lasts nearly 30 minutes!(i didn't actually measure it but it take a long time in the same order). after starting boot sequence which is showed on monitor everything looks normal. e.g copy of files would be done by speeds between 2MB/s to 30 MB/s depending on the targets.I used to use the external hard derive to boot from different laptops and PC's from start but I didn't have such a problem anytime.
I have compiled the linux kernel. My bzImage is 1,14 mb big
Anyway. It's only 2 programs i need and it's Python and Busybox. I have compiled python and busybox and put them together in a folder. Busybox is 146 kb and pyton is 4,4 mb.
But how do i make an initrd file of them? Or should a make an initrd file of them?
I get this error when a runt with a compiled busybox to gz format as initrd, and without initrd.
Quote:
VFS: Cannot open root device "sda1" or unknow-block(0,0) Please append a correct "root=" boot option; here are the available partions: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)Pid: 1, comm: swapper Not tainted 2.6.38.3 #1
Why use nash instead of busybox in initrd and initramfs? I'm just looking for pros and cons of both really (and any other applications with similar functionality). I'm currently leaning towards busybox being the better option, why redhat and fedora use nash in their initrd.
I would like to modify my init.gz and add udp-sender to this image. After copying the program compiled on my system to init image I have error when I try run udp-sender: udp-sender not found When I checked ldd I saw that the some libraries are missing. I copied them from my system but still got the same error. how can I compile program for my init.gz?
I run alot of Linux running in memory. Mainly by PXE booting a kernel and the entire OS as the "initrd" file.
I have a RHEL6 image running as a VirtualBox guest and the entire OS (minimal) is contained withing 1GB of disk. I wan't to boot the entire /dev/sda1 "/" (its the only partition on the drive, no swap) as the initrd file and run everything from memory. But grub won't let me. So before I try and re-invent the wheel I thought to post here first.
Details. RHEL 6 as guest in VIrtual BOX. configured with 3Gb memory. HD is single partition and known as /dev/sda1.
But the grub windows just freezes. Apparently it doesn't like the fact that I've referenced the entire partition (hd0,0) as the initrd. Any thoughts? Or any better boot loader like SYSLINUX?
BTW, I am not worried about the /etc/fstab mentioning /dev/sda1 at this point, I have a fix for that already. I would like to see grub load up the partition as an initrd.
After installing numerous stuff on my Slackware system, I notice I am running out of hard-drive space. I see that /tmp/SBo has about 1G of staff that I recently installed --- may I safely delete this staff?
In Iran there is a famous "access denied page" that redirects you to a strange page with a lot of HTML errors and lol, telling you RTFM about ridiculous Internet laws.I want to filter the contents of the page, because the page IP, URL, ... are all unknown.I don't know much about squid configuration scripts.I can read but cannot write
I'm developing some small application runs on tomcat 6This web application just query data from MySQLBut I'm concern about performanceHow can I check how many request It can serve as well ?I'm thinking about to change the application to runs on httpd (will write in PHP)Normally, how many request httpd can handle for simple database query ?
i had installed alfresco 3.4 server .previously we are working with alfreso version 1 .how i can moved the database content of alfresco 1 version content in alfresco 3.4 content.whether i had to migrate mysql of 3.1 directly to 3.4 alfresco server are else i had to just put the content in alf_data content store and content deleted table alone is enough .
We copied the directories/files from one filesys1 to filesys2 and since that initial copy have further added more directories/files to filesys2 from another source. How can we compare filesys1 to filesys2 to make sure all files/directories were copied successfully to filesys2? I would like a way to check filesys1 against filesys2 and only show/output when something is missing from filesys2 that exists in filesys1 and not report the additional/extra directroies/files that have been copied to filesys2.
