Fedora :: F15, Diskless Node Went Into Emergency Mode

Aug 31, 2011

I made a diskless image against Fedora15, during the boot I found it displayed the following error message and went into emergency mode.

The error message:

Starting Relabel all filesystems, if necessary ^[[1;31maborted^[[0m because a dependency failed.^M
[ 107.607155] systemd[1]: Job fedora-autorelabel.service/start failed with result 'dependency'.^M
Starting Mark the need to relabel after reboot ^[[1;31maborted^[[0m because a dependency failed.^M


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General :: Emergency Mode Can Mount HDD With FS Error / Not In Rescue Or Single User-mode

Dec 1, 2010

My linux workstation recently crashed. After rebooting, Linux (Red Hat 5.3) will not boot properly and automatically went into emergency mode or recovery mode i think. I can still see my /home/user/ and all the files inside.I boot from CD to rescue mode and tried mounting read-only the /dev/sd5 which contains the files in the crashed hard disk to try to copy out my files but mounting was unsuccessful (invalid argument). I checked the filesystem type using fsck -N /dev/sda5 and shows it to ext2. i tried to mount another known working hdd and was successful.

My question is why in emergency mode, the crashed hdd is able to be mounted automatically as read-only but cannot be done in rescue mode thru a bootable CD?Is there any special mount options used in emergency mode?I also cannot copy out in emergency mode booting from the crashed hard disk as everything is read only.

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Red Hat :: Boot In Emergency Mode (not Single User Mode)

Mar 10, 2011

I need boot in emergency mode (not single user mode), from docs:


in red hat enterprise 5 it's ok, not in red hat 6.

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Red Hat :: Unable To Boot Into Emergency Mode

Feb 11, 2011

I'm trying to boot into emergency mode but i'm having no joy. I can boot to single user mode (by adding s or single at the end of the kernel line in grub) and I can also boot to init=/bin/sh mode by using the same method, but emergency is not working. I'm using RHEL6 x64

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Debian :: Emergency Mode After Update - Md0 Failed

Jan 15, 2016

I have a Debian 8 system here running off an SSD with a five-drive RAID5 array (md0). I can reboot this machine just fine until I do an apt-get update and upgrade, at which point it fails to boot. I get the following:

A start job is running for /media/Storage (the mount point for md0)

Afterwards it dumps me into emergency mode. journalctl shows me these worrisome lines:

Timed out waiting for device dev-md0.device.
Subject: Unit dev-md0.device has failed.

Now, I have a backup image of this installation from right before running apt-get update and upgrade. If I restore that image, Debian boots fine and mounts the array successfully every time. Until I update and upgrade again. I've seen it happen three times now.

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Debian :: How To Rebuild FSTAB From Emergency Mode

Jun 19, 2015

I used a clonezilla live cd to clone a working updated install to another SSD of the exact make and model. Something went terribly wrong, and the new system booted to emergency mode. I then went back to my working laptop I cloned from and it did the exact same thing when booted, into emergency mode. After a couple of days trying to figure out how to rebuild the FSTAB on the once working machine, I finally figured out how to mount the root partition and copied all my important stuff off. WHEW!

Before I was able to mount the root partition, I had a heck of a time trying to mount it, getting errors about unable to read superblock, etc. I used testdisk that I installed on a debian live cd (on a flash drive) and it did something, not sure, but after that, and rebooting, I no longer had sda1,sda2, and sda5. I only had 1 and 5. sda2 was the root partition (extended, ext2) and I thought all was lost. But after running fdisk -l, I noticed two other devices... dm-0 and dm-1. I noticed that dm-0 was my root partition and read that it has something to do with LVM. I mounted it, and grabbed all my important stuff.

Now I am stuck at rebuilding my fstab so my boot, root, and swap partitions are properly mounted. Again, I do not have anything to copy and paste yet. I guess I got lazy since a lot of my work on this system is via Putty and SSH from a windows machine. It certainly looks like the partitions are there and ok, just not sure where to go from here.

I read that I need to get the UUID's from the partitions, then rebuild the fstab using those. I figured out pretty quickly that using /dev/sda1, 2, and 5 did not work. And the UUID's are pretty long. Without copy and paste, I am not sure how to use those without manually keying them in. I tried shelling into my laptop via putty while it is in emergency mode but failed.

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Debian Configuration :: Stuck In Emergency Mode

Feb 21, 2016

I cloned my disk that have dual boot in it clone the disk remove the old one put the new one so far okay. But when i put with the new disk to linux it goes to the emergency mode:

run fstab and this is my fstab results:

# <file system> <mount point> <type> <options> <dump> <pass>
# / was on /dev/sda1 during installation
UUID=cd9637db-0479-4ef0-90fd-481a50e23060 / ext4 errors=remount-ro 0 1
# swap was on /dev/sda5 during installation
UUID=df29ffb9-91a8-48d7-91cd-5e671b55677d none swap sw 0 0
/dev/sr0 /media/cdrom0 udf,iso9660 user,noauto 0 0
UUID=696FF92C4C532245 /media/Windows ntfs defaults,x-gvfs-name=Windows,x-gvfs-icon=%2Fhome%2Fdarkangel%2FDownloads%2Fwindows_hdd_icon.png,x-gvfs-show 0 0

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Debian Configuration :: Boots On Emergency Mode After Crash

Aug 8, 2015

First of all, my computer is running Debian Jessie. uname -a gives me this output: Code: Select allLinux felix-PC 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt11-1+deb8u3 (2015-08-04) x86_64 GNU/Linux

So today I updated my system with aptitude update and aptitude upgrade, and there was few paquages that were updated. Among them was one "linux-image" or "linux-headers". I believe that it is linked to this security update: [URL].... .

During the time aptitude upgrade was running, I was simply surfing on Iceweasel. However, it seems that my system suddenly restarted, without asking me the permission or without notifying me. It really looked like I pressed the restart key, but I actually didn't. My computer battery was full charged and plugged in. So, I do believe that it is my system that rebooted himself after the aptitude upgrade was completed (or even during the upgrade, I don't know).

So my computer restarts, and brings me to GRUB menu: I boot Debian and then I get the usual [ OK ] ***** lines telling that the system boots normally. But this time, I get some errors:

Code: Select all[FAILED] Failed to set up automount Arbitrary Executable file format file system Automount point
[FAILED] Failed to start load kernel module
[FAILED] Failed to mount /boot/efi
[DEPEND] Dependency failed for Local File Systems

I arrive then in Emergency mode with this message:
Code: Select all Welcome to emergency mode! After logging in, type "journalctl -xb" to view
system logs, "systemctl reboot" to reboot, "systemctl default" to try again
to boot into default mode.
Give root password for maintenance
(or type Control-D to continue):

I tried systemctl default but it doesn't boot my system normally. I also tried Control-D but it just reprints the same message. And finally I typed journalctl -xb, which gives me a long log file (855 lines) that I do not understand.

I would give this log file, but it seems that my internet connexion is broken (because of the kernel, I mean), even with an Ethernet cable. So I can't connect with ssh to the computer I use at the moment, and I can't either send it to myself by mail. I tried to mount an usb key, but it seems that any key won't be mounted because of a kernel problem.

An obvious solution to my problem may be to come back to an older kernel version. However, only the lasted kernel version (x86_64 Linux 3.16.0-4-amd64) is installed. dpkg --list | grep linux-image gives me indeed:

Code: Select alliF linux-image-3.16.0-4-amd64 3.16.7-ckt11-1+deb8u3 amd64 Linux 3.16 for 64-bit PCs
ii linux-image-amd64 3.16+63 amd64 Linux for 64-bit PCs (meta-package)

I do not know how to come back to an older kernel, as far as I haven't any internet connection and as far as I seem to not be able to load an usb key.

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General :: Make A DRBD Node Start Itself As A Primary Node Automatically?

Jan 28, 2010

I've set up DRBD on 2 machines, 1 of them is the master, another is the slave.

After each bootup, I need to run the following on the master machine:

drbdadm -- --overwrite-data-of-peer primary all

Do we need to specify which machine should be the primary node every time? Is there any method to make the machine "know" it's itself the primary node?

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Programming :: KSH Script Behaving Differently On An HACMP Cluster Node (prod) & A Single Node (UAT)?

Dec 16, 2010

I have created a simple menu driven script for our Operations to take care of the basic monitoring and managing of our production application from the back-end. Now, the script when tested in UAT environment was fine, but when deployed to production it kind of behaved oddly.hen the Operator chooses an option from the menu he is given the output and at the end is prompted to return to the main menu by using ctrl+c. In production, this return does not occur for some strange reason and the program just sits there.The session becomes unresponsive after that and I'm forced to terminated it by closing the PuTTY.I tried enabling the debug mode too (set -x) and still was not able to find any useful hints/trails as to why.

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CentOS 5 Networking :: Setup The Cluster To Automatically Failover The Service To Another Node Case One Node Fails?

Mar 1, 2011

I am familiar with windows 2008 cluster servers, and I just started testing with centos cluster. I am creating a simple 2-node cluster, for a simple ping test.

Node 1:
Node 2:
Virtual ip:

So far, I can ping a virtual ip, and manually relocate it between the nodes, but I didn't figure out, how to do this automatically. So this is my question: How can I setup the cluster, to it automatically failover the a service to another node case one node fails?

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Server :: Node Failover And Another Node Take Over Resources On HA Cluster?

Oct 27, 2010

I don't have much experience in clustering. And I'm deploying a cluster system on CentOS.But I don't know how long a node failover and another node take over those resouces to continue running service is good, fast or slow? 1s, 10s or

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Fedora Networking :: Diskless Boot Not Working

Jan 4, 2011

I have followed everything in the fedora 14 documenation about setting up a diskless pxe boot and I can get past initialization. The kernel and initrd load fine from the tftp server. The kernel starts, then hangs after probing USB devices. The messages show that initrd does not have support for nfsroot. I think I need to better understand how to add this in when I run dracut to build the initramfs image.

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Fedora Networking :: Nfs Permission Error On Diskless Environment

Dec 9, 2010

I'm trying to set-up a diskless environment on my home network, based on a F12 server and one FC14 client and I have a problem that I think is related to NFS, but googling around I cannot find any solution.
Basicly the client boots correctly, gdm fires up showing the login window, but the system doesn't let me in, if I switch to console (CTRL+ALT+F2) I cannot login with both standard and super user getting a "permission denied" error.

I tryed to mount the exported fs on another computer and ls -l on the mounted dir shows both user and group set to nobody.

If i mount the exported dir on server side (i.e. mount -t nfs localhost:/...) permissions user and group shows correctly

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Fedora Servers :: Creation Of Diskless Workstation As A Citrix Client?

May 22, 2009

I am currently working on a Diskless Fedora10 based PXE image that should auto login and then launch the ICA client without launching the desktop (so normal autostart will not cut it)I have got the image up and running, the clients boot correctly, autologin etc, but still launch KDE, and I was hoping replace the desktop with the ICA Client.

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Red Hat / Fedora :: CentOS 5.4 GFS2 - 3 Node Cluster

Feb 19, 2010

I have lack of understanding of CentOS in general. I have looked for a remedy on other forums and google, but haven't been able to find the answer. I have a 3 node cluster that was functioning great until I decided to go offline for awhile. My config is as follows:
node 2: vh1
node 3: vh2
node 4: vh6
All nodes connect to a common shared area on an iscsi device (vguests_root)

Currently vh2 and vh6 connect great, however since putting the machines back online I can no longer connect with vh1. A dmesg command on vh1 reveals the following:
GFS2: fsid=: Trying to join cluster "lock_dlm", "Cluster1:vguest_roots"
GFS2: fsid=Cluster1:vguest_roots.2: Joined cluster. Now mounting FS...
GFS2: fsid=Cluster1:vguest_roots.2: can't mount journal #2
GFS2: fsid=Cluster1:vguest_roots.2: there are only 2 journals (0 - 1) .....

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Red Hat / Fedora :: Setup Two Node HTTP Cluster?

May 5, 2011

I want to setup two node http cluster,

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Red Hat / Fedora :: Change Transmission Range Of A Node From Default 250 To Some Other Value?

Dec 8, 2010

I am working with NS-2, I am facing a situation where I need to re align the transmission range of a particular node. Can I do this by modifying the protocol's source code? I should not change the default value from 250, only few nodes who satisfy a particular criterion should be reset to some other range like 200 or 300. How can I do this?

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Fedora Servers :: Build A 3 Node Web Server Cluster To Run A Php Application ?

Feb 24, 2011

I need to build a 3 node web server cluster to run a php application. Since the app requires users to login (which means a session state is to be maintained), I will be sharing sessions save path, I also need to share the application directory across 3 nodes. I having trouble deciding which cluster file system to select.

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Red Hat / Fedora :: Cluster Suite When Node Power Off The Service Is Not Migrated?

Nov 20, 2009

I am using the Redhat Cluster Suite (luci and ricci) on my centos 5.4. i have 2 nodes in a cluster.I had clustered an apache server.The service is up end running and i can stop,start and switch on all two node.The problem is when i try to simulate a fault for one node.For example:The apache resource stay on the first cluster node.If i power off the first cluster node (not halt or init 0 but take off the eletric power off), the second cluster node not take the resource.With the clustat command, the service still running on the first node.But the service is down. The first node is dead.Only one the first node is join again the cluster the resource goes up on the second node.

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Ubuntu :: Can't Upgrade A Diskless Workstation?

Aug 15, 2010

I have a mythfrontend box that boots diskless - everything works fine. However, when attempting to upgrade the kernel - grub complains about not finding a device, and the upgrade fails.How do I fix this? Other packages upgrade with no problem.

The following partially installed packages will be configured:
grub-pc linux-generic linux-image-2.6.32-23-generic linux-image-2.6.32-24-generic linux-image-generic


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Ubuntu :: How To Make An Emergency Backup

May 30, 2010

So I was doing the update to 10.04 when a freak thunderstorm knocked out the power. I can no longer load onto ubuntu from the HDD. I have been told to either do an emergency back up using the 10.04 live disk. I am not sure what to do when it comes to that. I have also heard I can just repair the boot file on the HDD. I don't know how to do that either. I wouldn't mind I fresh install but I do not want to lose any of my data.

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Networking :: Diskless Thin Clients On Wireless LAN Possible?

Apr 1, 2010

That is, the thin clients will have to get their OS image via TFTP, and their IP address via DHCP on a *wireless card* - is this possible?What spec should I ask for/search for when buying the WiFi card?

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Fedora :: Emacs: Flyspell-mode Not Working In Tex Mode?

Jun 13, 2011

I am an emacs user, and I noticed that on my new machine (running F15, 64bit) flyspell-mode will not work in tex mode.

I get errors that look something like this:

Spell-checking inequality-model.tex using hunspell with default dictionary...
Spell-checking region using hunspell with default dictionary...done
ispell-send-string: Process ispell not running
When done with a buffer, type C-x #

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Ubuntu :: Emergency Command To Kill Processes?

Jun 15, 2010

I'm working with Eclipse and it's starting to misbehave now and then which completely freezes my computer. Is there any emergency command to kill such a misbehaving process so I don't have to reboot my computer?

I already have a emergency xkill icon in my taskbar and a [Ctrl]+[F1] console with "> sudo killall eclipse" pretyped(!) but sometimes it's even to late for this. What I would need is a emergency command/console that gets a guaranteed amount of process time so I can kill these process.

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Ubuntu Installation :: Emergency USB Thumb Drive ?

Jan 25, 2011

I want a USB drive for emergency situations. It will have sensitive information, family photos, etc. stored on it. I want it to have one encrypted portion (TrueCrypt) for the sensitive materials. I want the files to be able to be viewed on a Windows machine first and foremost. If no Windows machine is available I would like to have a bootable version of Ubuntu on the USB drive so I can boot it and also view the files.

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Software :: Emergency Recovery Environment On SD Card?

Oct 2, 2010

I just got a SD to IDE adapter and a 8GB SD card. I am looking to install Parted Magic onto the SD card and have the card permanently installed in the server so I can have an emergency recovery environment if need be... Unfortunately, Parted magic no longer comes with USB editions and the tutorials I found on the web all require windows to proceed with installing PM onto a USB stick or SD card. (What the .... !?!) I never played with syslinux before and I wonder if somebody out here could write a short & simple tutorial on how to install parted magic on a SD card. So far I am thinking of a 200MB bootable partition (sda1) + a 7.16GB (remainder) logical partition (sda5) where I would store some programs and other emergency files I might need. Then I would format the partitions and copy the content of the CD iso (?) to the sda1 and then install syslinux onto sda1 ?

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Networking :: DHCP For Diskless (PXE) Boot - Server Not Responding

Jan 7, 2009

I'm attempting to set up a server for performing diskless boots here. I'm using Gentoo 2008, and have followed the instructions here:


I've gotten to the end of the basic DHCP setup, and I can not get the server to issue addresses. I've confirmed dhcpd loads up OK, and is running in top.

Here's the contents of /etc/dhcp/dhcpd:

# Disable dynamic DNS
ddns-update-style none;
# Assume one default gateway for IP traffic will do


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Server :: An Interesting Challenge Involving Diskless Booting A PC?

May 13, 2010

An interesting challenge involving diskless booting a PC

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Server :: How To Setup Diskless PXE Client On Debian Lenny (HPC)

Aug 8, 2010

I currently have a debian lenny high performance cluster running seamlessly using dhcp and tftpd-hpa. All nodes are completely diskless, and i would like to keep it that way. I now would like to have a client boot over local into a full KDE desktop.

Here's the cache.
1. I would like the client to also be a node. I would like it to handle processing as the other nodes do, but this one with a full desktop, with ALL data and privileges accessible.
2. The client will have its own workstation graphics. It will need to have that driver loaded without slowing the system.
3. Client will need to be able to use its own usb, bd-rom, dvd, audio, etc. even though it will be booting into the HPC.
4. Wireless. I cannot run 70 ft of lan across an apartment. not happening.

The idea is a media center applicable "powerhouse" with high-end power and graphics for easy media editing, 3d creation, and gaming. Will also be used for webcache over all local, file sharing, and other server applications.

HPC specs:
-headnode: hp compaq p4-ht 3.2 ghz, 4x500gb, 4gb mem, gigabit ethernet, wireless-N
-nodes: 4x p4-ht 2.2 ghz, 2gb mem, no-name brand slim desktops; 2x panasonic toughbooks p4-mobile 1.8 ghz, 1.5gb mem; 3x gateway p3 unknown specs; and 1 hp 530 notebook 1.6ghz core2 duo, 1.5gb mem
-client: hp compaq core2 duo 2.13 ghz, 4gb mem, wireless n, bd-rom, 2x dvd-rom, usb 3.0 card, bluetooth, 1gb AGP nvidia geforce 6800 dual-dvi, no hd.
I need to know how to set up this PXE.

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