Why bind to LiveCD /proc before building initramfs ?
Imagine I have an unbootable system where I need to update the kernel image using
.
I have seen numerous examples online which show the following
After that we chroot into the broken OS and then execute the command to update the initramfs.
My questions are as follows-:
Are we binding the /proc and /dev of the Live CD to the broken system ? Or are we binding the /proc and /dev of the broken system to the live cd ?
If building the initramfs is dependent on the information of the OS for which the initramfs is built then won't it contain erroneous information if we build for the Live CD ? That is use the /proc and /dev of the LiveCD ?
Last edited by rbatte1; 08-07-2017 at 09:47 AM..
Reason: Tidied up numbered list
Hi, I just download FreeBSD LiveCD and burn it to the CDROM (Because I want to learn UNIX). But when I boot the computer from the CDROM, it display the username and password. I type "root" and the password blank. But it does not allow me to login. I try many user name and password that I guest but... (3 Replies)
What's the correct way to change the initramfs file that's used during boot?
I know that it's a gzipped cpio archive, but when I gunzip, extract, re-archive (without changing any files), and gzip, then the result is that the system does not boot any more. And I even set the cpio archive type.
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Thanks much! (0 Replies)
Hi,
I am trying to calculate the CPU Usage by getting the difference between the idle time reported by /proc/stat at 2 different intervals. Now the 4th entry in the first line of /proc/stat will give me the 'idle time'. But I also came across /proc/uptime that gives me 2 entries : 1st one as the... (0 Replies)
hey,
I am build an operating system but i cant seem to get it to boot. I am using GRUB as the boot loader, but I'm not sure if I have all the files need, on the CD, to load the operating system. So can anyone tell me what files I need in order for GRUB to load my OS.
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Long story short, I had a ps3 with both Lenny and Sid repositories. Knowing this is a bad idea and that Lenny is being deprecated I decided I wanted to move everything to Sid. I changed my repos and ran apt-get-update, upgrade, dist-upgrade. Had one warning during the apt-get upgrade that... (0 Replies)
Discussion started by: Azrael
0 Replies
LEARN ABOUT PLAN9
consolefs
CONSOLEFS(4) Kernel Interfaces Manual CONSOLEFS(4)NAME
consolefs, C - file system for console access
SYNOPSIS
aux/consolefs name dev [ name dev ... ]
C system
DESCRIPTION
To ease administration of multiple machines one might attach many serial console lines to a single computer. Consolefs is a file system
that lets multiple users simultaneously access these console lines. Each name/dev pair represents the name of a console and the serial
line device associated with it. Consolefs presents a single level directory with two files per console: name and namectl. Writes of name
are equivalent to writes of dev and reads and writes of namectl are equivalent to reads and writes of devctl. Consolefs broadcasts any-
thing it reads from dev to all readers of name. Therefore, many users can con(1) to a name, see all console output, and enter commands to
the console.
To keep users from inadvertently interfering with one another, notification is broadcast to all readers whenever a user opens or closes
name. For example, if user boris opens a console that users vlad and barney have already opened, all will read the message:
[+boris, vlad, barney]
If vlad then closes, boris and barney will read:
[-vlad, boris, barney]
Consolefs posts the client end of its 9P channel in /srv/consolefs; mount (see bind(1)) this file to see the consoles. An example of 2
consoles complete with console logging is:
% aux/consolefs bootes /dev/eia0 fornax /dev/eia1
% mount /srv/consoles /mnt/consoles
% ls -p /mnt/consoles
bootes
bootesctl
fornax
fornaxctl
% cat /mnt/consoles/fornax >> /sys/log/fornax &
% cat /mnt/consoles/bootes >> /sys/log/bootes &
The rc(1) script C automates this procedure. It uses import(4) to connect to /mnt/consoles on the machine connected to all the consoles,
then uses con(1) to connect to the console of the machine system. The script must be edited at installation by the local administration to
identify the system that holds /mnt/consoles.
FILES
/srv/consoles
Client end of pipe to server.
SOURCE
/sys/src/cmd/aux/consolefs.l
/rc/bin/C
CONSOLEFS(4)