Fedora Servers :: Creating The Initial Device Nodes?
Sep 16, 2009
I'm putting a server together and have run into a boot up problem. (I thought about putting this in the server forum, but it might be a more generic problem that others have seen and know how to rectify.) The install seems to have gone just fine. I have the /boot partition on an internal IDE drive. The rest of that drive and another are mirrored in a Raid0 configuration (using the Linux software to do that) for data storage. The swap partition is a part of the Raid5 SCSI array that also has the / (root) partition on it.
After installation it would not finish the booting process. I suspected that GRUB didn't like all the Raid arrays and such, but it seems to be fine. I can say that because the machine will boot into rescue mode with the GUI splash screen and I have access to the whole directory tree. I have already searched on-line and following prudent advice, ran the yum update while in the chroot /mnt/sysimage mode. That only took overnight to download and most of this morning to complete. Still no dice. Used vim to delete the rhgb quiet commands in the grub.conf file so I could see where the kernel seems to be hanging.
So right after the "Creating initial device nodes" is a line about my generic PS2 wheel mouse. So I tried a USB mouse. Got more output so tried swapping out to a USB keyboard. Got a little further with more information about input devices, but still stops. Also, I tried a PCI video card just to make sure the onboard video wasn't the problem - no change. So, if someone in the Fedora community knows what loads up or is configured right after the mouse and keyboard, I might be able to figure out what's causing the computer to hang during the boot process.
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Dec 3, 2010
Are there any prerequisites which much be met in order for udev to create /dev/usb/hiddev* nodes?
I have two Slack 13.0 systems, each connected to a APC UPS via USB, one of which creates a hiddev0 node and the other doesn't. apcupsd can't find the UPS unless this node is present.
The "working" system has been stable in its current configuration for so long that I honestly can't remember if I had to tweak anything in this regard. I've verified that it doesn't use any local udev rules to create this node, and to the best of my knowledge there are no external scripts or processes which would create it either.
The non-working system has a similar configuration - no local rules and/or scripts which touch usb devices or nodes.
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Jun 22, 2011
I'm having a problem with NFS. I'm trying to mount /home, which is on the server, to the client nodes. The server is currently running FC14 (64 bit) and I'm in the process of updating all the clients nodes to the same OS. Currently, all the client nodes are running FC8 (32 bit) and are capable of mounting /home on the server. However, the one client node that I have updated to FC14 is having problems mounting /home. I can ssh to the node with no problem however I get the following message:
Could not chdir to home directory /home/myuserid: Permission denied. Now, if I excute the following command: "sudo mount -a" I get no errors and now I can see my home directory.
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Dec 1, 2010
i have installed ns2.33 and added mobiwan , i tried to run tcl script after modifyng simple tcl which i have got along mobiwan patch, but the problem is after creating some nodes and setting their positions in the tcl, according to my topology, i tried to run , but the command i have included in tcl , which sets the positions for mobile nodes, has no effect , which means that the positions of the mobile nodes is already fixed , trough tcl i am not able to change , and also each time when i run nam , different positions mobile nodes taking, and also the mobile node is not moving , even if i have given mobility to it, at different time , i have given different destinations.this is part of tcl in which i have set positions mobile node.
Code:
set cn_ [create-router 0.0.0]
set router_ [create-router 1.0.0]
set bs1_ [create-base-station 1.1.0 1.0.0 200 200 0]
set bs2_ [create-base-station 1.2.0 1.1.0 200 600 0]
set bs3_ [create-base-station 1.3.0 1.2.0 600 200 0]
code....
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Aug 17, 2010
I'm running 10.04 64-bit diskless on ESXi, installed as a minimal virtual machine. I want this server to access an iSCSI drive. The machine can view the iSCSI shares with iscsiadm, and can even log into the drive. When I do an iSCSI login, this appears in /var/log/messages:
Aug 17 11:08:21 ubuntutest kernel: [1123295.329972] scsi4 : iSCSI Initiator over TCP/IP
So, it appears that open-iSCSI is working correctly. But no new /dev/sd* nodes appear, and nothing new appears in /dev/disk/by-path. I'd expect to see /dev/disk/by-path/ip-XXXXXXXXX. fdisk -l shows nothing but the boot drive. My guess is that the "minimal kernel" doesn't include some necessary module or driver.
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Oct 14, 2010
When i create a new event device (/dev/input/event) it is automatically grabbed by Xorg:
Code:
(II) config/udev: Adding input device Keypad Emulation Driver (/dev/input/event7)
(**) Keypad Emulation Driver: Applying InputClass "evdev keyboard catchall"
[code]....
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Apr 15, 2010
I'm a starter here in linux, I have written a driver code and in that, I register my character devices by passing 0 for the major number.
To set up I used to use mknod command from terminal to create node,
Is there any method to create node dynamically from driver code during initialization and delete them at cleanup time?
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Mar 13, 2011
Early in the boot process, system generates message "Creating nodes with udev." After a pause, CPU timeout dumps are listed on the display. Likely it is related to wthe display driver (Intel 845G) as the system can be brought up in failsafe mode. /etc/X11.conf is intact. The system was apparently successfully upgraded online from 11.3 using the zypper method. This issue has appeared a day following the upgrade, after restarting the 11.4 system.
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Mar 3, 2010
I'm trying to work with a project manager and some hardware guys and all of us are trying to get a grasp on the UEC.
1. Can a VM span multiple nodes?
2. If a website scales beyond 100% CPU on a node, does it automatically spill over to another node and start using processing power there?
3. Do I have to rewrite the code of my web app (such as WordPress) so that it works in a private cloud?
4. Does KVM support virtual memory such that when I run out of RAM it uses paging?
5. How is UEC any different than me bringing up several servers with several VMs inside, and then moving VMs around as I need? Is it really a cloud where the VMs exist in a cloud, not necessarily a node?
6. If I power off a node while it's hot, how can I assure myself that the data will be okay?
7. Do I want to use SCSI attached RAID, or NAS, or NFS? We're simply trying to host thousands of blogs and LAMP sites in a way that we can handle spike loads.
8. Do I attach the disk volumes to the cluster controller and then run a command such that the nodes can mount those virtual volumes?
9. Do I need to run another command on the VMs to mount volumes that the nodes can see?
10. What is the role of the storage controller and how is it separate from the cluster controller?
11. How many systems, minimum, do we need to get this tested out?
12. For testing purposes, can I install UEC on an Intel P4 server and then a node on Intel P3 server -- even with some limitations?
13. Let's imagine I have 5 node servers, and one catches fire and is a total loss. Can I get those VMs back and get that data back? What would have to be the proper config to make that happen?
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Mar 11, 2010
I want to connect two systems in clustering concept. am new for clustering configuration. I have installed ubuntu 9.10 server edition in two system. what do to the next step to configure clustering in ubuntu 9.10 server edition.
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Jul 19, 2011
So I cant seem to be able to install fedora 15. I think it is the disk. I have windows 7 already installed (and would like to keep it) It was installed on the end of the hard drive leaving a 100 GB chunk in the center of the drive open and unformatted (this may be the problem). Anyway I used the live cd and tried to format the unformatted partition to exf but it gives me this error
Code:
Error creating partition: helper exited with exit code 1: In part_add_partition: device_file=/dev/sda, start=105906176, size=104752742400, type=EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
Entering MS-DOS parser (offset=0, size=500107862016)
MSDOS_MAGIC found
found partition type 0xee => protective MBR for GPT
Exiting MS-DOS parser
Entering EFI GPT parser
GPT magic found
partition_entry_lba=2
num_entries=128
size_of_entry=128
Leaving EFI GPT parser
EFI GPT partition table detected
containing partition table scheme = 3
got it
got disk
new partition
added partition start=105905664 size=512
committed to disk
Error doing BLKPG ioctl with BLKPG_ADD_PARTITION for partition 2 of size 105905664 at offset 512 on /dev/sda: Device or resource busy
Do I have to reinstall windows for this to work or is there something I can try to do.
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Jun 23, 2010
Now that Ubuntu is at a LTS stage with Lucid and is easier to install PV in XenServer, I have been wanting to drop my current debian VM nodes in favor of Ubuntu 10.04. So far I have DRBD8 and OCFS2 all working nicely as primary/primary and I am on the next stage of my setup by installing ldirectord and heartbeat. Can anyone shed some light on heartbeat-gui (hb_gui) as it no longer seems to be in the repositories (since Jaunty)?[URL].. I understand that Lucid now uses pacemaker as part of a clustering suite but I have no idea if I really need it. I really liked being able to run hb_gui and logging into the heartbeat cluster to manage resources via point and click so if anyone has any hints on replacements or newer preferred methods to accomplish the same tasks via point-n-click,
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Apr 19, 2011
[i use Ubuntu linux 10.04 LTS - the Lucid Lynx] i tried to print a document and i got the following message from the "document print status (my jobs)": "There was a problem processing document 'take it easy' (job 400)" i tried to print other things but i got the same error. after any print request i sent the printer asked me to release the paper it took, and when i release it, it printed this:"Unable to open the initial device, quitting." i have "HP Device Manager" installed on my computer, and lately i tried to install a wireless printer (officejet 4500 g510n-z) through it, and it failed because the connection between the printer and my computer disconnected before the terminal finished the installation. i didn't try to print with the deskjet right after it but now when i try- it doesn't work, so it might have something to do with my current problem... also when i looked at the HP Device Manager i saw the deskjet printer icon marked with X so i used this program's option "Setup Device" and the X mark disappeared.. and it still doesn't work.
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Nov 15, 2010
There seem to be a number of people that believe the junk that NetworkManager is buggy.As I believe the opposite, I want to offer more detailed instructions on how to create the initial connection, and how to troubleshoot the process. Once readers of this group have commented on this draft, I plan to ask the moderators to make it a sticky.
This description will be specific to the KDE desktop. The steps will be similar for Gnome, but the details may be different.
Step 1: Do you have a Network Manager applet in the system tray? If not, use YaST =>
Network Devices => Network Settings. Under the "Global Options" tab, click on the "User Controlled with Network Manager" button. If it is already set, you will get a warning box when "Network Settings" starts.
Step 2: Now you should see the NM applet. Click on it and check the popup. If the "Enable Wireless" checkbox is inactive (gray), there are several possibilities: (1) Your wireless device driver is not loaded, (2) the necessary firmware is not available, or (3) an rfkill switch/button is wrong. For (1), check "hwinfo --network" and check the "Driver" line. If it is blank, then you need to run the command "/sbin/lspci -nn" if the device is connected to a PCI bus, or "lsusb" if a USB device. Post the results on the Wireless forum. For (2), look at the output of "dmesg | grep firmware", which will list the name of the file(s) to be loaded.
For Broadcom devices that use either b43 or b43legacy, the firmware is obtained by using the command "/usr/sbin/install_b43xx_firmware". You will need a wired connection to complete this step. For (3), you will also need a wired connection and install the
"rfkill" package using the command "sudo zypper in rfkill". The interrogate the current settings with "/usr/sbin/rfkill list". If any device is "Hard blocked", then wireless will be disabled.
Step 3: Once the "Enable Wireless" checkbox is active, check it and click on "Manage
Connections". Choose the Wireless tab and click on Add. Enter the name for this connection. You will probably want to check the "Connect Automatically" box. Next click on the Scan button. If you do not see your Access Point (AP) in the map, you will not be able to get a connection. Click on the AP you want, and click OK. The (E)SSID should be in the SSID box. The other boxes on this screen should be OK as is. If you have several APs with the same SSID, but you wish to restrict the connection to only one of them, then you should enter its MAC address in the BSSID box.
This usage is rare. Next click on the "Wireless Security" tab and enter any encryption secrets. The correct type should have been selected. For WEP encryption, you will need to use the hex key, not a passphrase. Once this is complete, click OK to close this screen, and the configure screen. During this process, a popup should appear offering to use a
wallet to store the connection secret. If you use a password on this wallet, you will need to enter that password each time you log in. If you set no password on the wallet, the security level is lowered, but entering a password is avoided.
Step 4: At this point, you will need to disconnect the wire. Whenever the computer can make a hard-wired connection, it will supersede any wireless option. The wireless connection should then occur automatically.
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Feb 12, 2009
I am looking into creating a web caching server for myself using fedora 10. I believe I need to use squid for this but it seems to have a lot of features. Basically, all I want for now is to be able to cache web pages that I and my network users use the most, increasing access time and lowering the load on my internet connection. Can squid do this and can someone point in the right direction on an article on how to configure such a thing?
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Feb 28, 2010
I'm working on setting up a new subversion server and getting an error I'm not having much luck resolving.
I'm attempting to create the repository in /home/svn/foo with the command svnadmin create /home/svn/foo while in /home/svn.
I am greeted with the error: svnadmin: SQLite compiled for 3.6.20, but running with 3.6.17
I installed subversion via yum install subversion
I've installed SQLite 3.6.22 from source and removed/installed subversion with no change.
What gives? I wasn't really wanting to install subversion from source. Seems a bit excessive.
Environment stuff:
[root@COS svn]# yum repolist
Loaded plugins: presto, refresh-packagekit
repo id repo name status
fedora Fedora 12 - i386 enabled: 15,366
updates Fedora 12 - i386 - Updates enabled: 4,731
repolist: 20,097
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Feb 7, 2011
I need to create a lot of users locally on my server.I have these info:username:GID:UID.How I can make a "for cycle" for make a multiple useradd? (useradd -u UID -g GID -m /home/USERNAME -s /bin/bash USERNAME)I tried to do this:
touch userlist.txt (UID:GID:USERNAME)
100:110:user1
200:210:user2
[code]...
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Mar 23, 2010
I've installed mailman on 9.10, using apt-get, have apache2 setup already. However I'm getting 403 forbidden issues when trying to access [URL] I may have mucked something up as initially i jumped straight in and created a virtualhost and played around with the URL redirects. but as far as I can see, it's back to its default and it's still not working... When I try to access the page, in my apache error.log, i get this:
Quote:
[Wed Mar 24 02:36:37 2010] [error] [client 192.168.1.1] attempt to invoke directory as script: /usr/lib/cgi-bin/mailman/
I've tried check_perms, it does give this error:
Quote:
root@babel:/etc/apache2# check_perms
/var/lib/mailman/templates bad group (has: root, expected list)
/var/lib/mailman/bin bad group (has: root, expected list)
/var/lib/mailman/cgi-bin bad group (has: root, expected list)
[code]....
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Aug 12, 2010
if I want to print a regular document from the main tray, no problem. If I want to print an 8x11 photo from the main tray. slight problem (might be ink related, still researching that side). But if I want to print a 4x6 or a 5x7 from Linux massive problem Printer: HP Photosmart D5460. Will not print from the Gimp at all, I get the following when I try to print a photo using the Gimp: A page from the main tray with text similar to this:
"****Unable to open the initial device, quitting"
Actually for the last several years under OpenSuSE I have never been able to print a photo from the Gimp. It always prints some text error then quits OR will print the error at the top of every sheet in the tray until the printer either is manually unplugged / turned off OR it runs out of paper. The printer I have is listed as working perfectly according to Open Printing dot org. But none of my applications seem to be able to get the printer tray to operate for the smaller photos. Currently I have to copy the images to a card in the printer then print from the card. Unacceptable if you ask me.[URL]... what photo capable printer out there actually works 100% with OpenSuSE? And I mean I can access all the trays from all the applications I could possibly use, as well as monitor ink levels, perform maintenance and so forth.
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Mar 6, 2009
I'm using FC10 and I want to create a symlink to my movies directory in my home folder:
This is what I did:
I created in
/var/www/html
ln -s /home/username/movies movies
Then in /etc/httpd/conf/httpd.conf
DocumentRoot "/var/www/html"
<Directory />
Options FollowSymLinks
AllowOverride None
</Directory>
<Directory "/var/www/html">
Options Indexes FollowSymLinks
AllowOverride None
Order allow,deny
Allow from all
</Directory>
<Directory "/home/username/movies">
Options Indexes FollowSymLinks
Order allow,deny
Allow from all
</Directory>
Restart apache and then the test page is working.
The directory /home/username/movies has following permissions:
drwxrwxrwx 2 apache apache 4096 2009-03-05 23:43 movies
When trying to access my webpage at localhost/movies I get the 403 Forbidden Error.
Ok then, entering:
sudo -u apache ls /var/www/html
> movies
This works, sudo -u /var/www/html/movies returns the permission denied error.
As well sudo -u /home/username/movies
Is the user apache chrooted by default? SELinux is in permissive mode. What can I do?
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Apr 25, 2010
i've installed directory server in a fedora 12 box, i got it running and i can access it using coldfusion to manage users and groups.i hit a snag when creating a user, this because coldfusion cannot generate a password, the directory server needs a certificate and a ssl connection.so i started googling for a way to generate and install a certificate on the server itself and in the directory.s is my administration server and directory(it's novabase directory) not the other one.
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Jun 22, 2010
I have 3 windows computers and just bought linux server. All of them are currently connected to switch. There is also Wireless AP connected to switch and ADSL router connected to switch (yeah, I know its possible to buy a 3in1 but this was bought piecemeal). ADSL is doing the DHCP and I'm not using any other advanced services.
Now, I want to route everything over the linux server. I got the 3 LAN cards for him (one for wireless, one for LAN and one for ADSL) but when I connect everything this way its not working (surprise surprise). I'm following Linux Advanced Routing & Traffic Control HOWTO but its surprisingly sparse on the topic of network setup and i dont know how to proceed now. Since the server will be a choke point I presume I need to setup DHCP server on him? First question is: can I use same netmask on all of these subnets? Ubuntu DHCP server guide uses both static and DHCP and am not sure if I should also use static on some routes or is it ok to use DHCP on all.
Also, when I was installing ubuntu server only one LAN card was used (eth2) so ifconfig shows only lo and eth2, but when I do ifconfig eth0 up and ifconfig eth1 up it doesnt look like its working. Anyway, hope somebody has some tips to point me in the right direction, primarily DHCP server setup and if I missed any steps...
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Feb 10, 2011
Last night I created a fresh install of Ubuntu Server 10.10. I was working through a tutorial to set up a development server for home use, and everything worked perfectly. I was able to install OpenSSH, Apache, MySQL, and PHP (and Vim) with no problems. I was also able to use "ifconfig" to determine the network address of the server and I was able to view web pages on the server from another machine on my home network, using a browser. So, everything was "peachy". [By the way: The server is connected to the router using a CAT5 cable. This is a WIRED connection] I shut the Ubuntu server down at the end of the night and, now that I have rebooted this morning, I have apparently lost the network interface. I cannot ping anything from the server. If I run ifconfig, only the "lo" configuration is listed, with the 127.0.0.1 address.
[Code]...
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Jan 12, 2010
what kind of network between cloud controller and nodes, is required for a proper cloud installation? I mean, Does all machines needs to be in same network, in same lan, or may be in MAN or WAN ? how much should be network throughput? 1Mbit/sec , 10Mbit per sec, or 1Gbit/sec? I ask because I need to know the possibility of running nodes on different locations.
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Aug 7, 2010
This is my first server installation. I am intending to make this a basic web server for educational purposes. I have installed this server in VirtualBox, everything seemed to go fine besides the fact that I accidentally hit the enter button when I was at the opportunity to install the additional software during the initial setup. I figured that it was no big deal as I could just use aptitude to get what I needed later. My first step was to get LAMP setup. Heres where it started to seem to go wrong: I installed Apache2, however, it seems that I am unable to test it (no browser).
Code:
oliver@DrDoak:~$http://localhost/
-bash: http://localhost/: No such file or directory
oliver@DrDoak:~$
I then proceeded to install php5 again I have ran into trouble when trying to open through GEDIT.
Code:
oliver@DrDoak:~$ sudo gedit /var/www/testphp.php
sudo: gedit: command not found
oliver@DrDoak:~$
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Apr 12, 2010
I have a Linux server that runs the Sybase DB. Sybase suggests using character devices to access raw devices rather than O_DIRECT to block devices, or cooked FS's. So, I went ahead and configured /etc/sysconfig/rawdevices as such:
/dev/raw/raw1 /dev/vg01/tempdb
/dev/raw/raw2 /dev/vg01/testdb
/dev/raw/raw3 /dev/vg01/fakedb ...
This works fine. I set 'chkconfig rawdevices on' and all is well. I read that this method is deprecated and went about trying to accomplish the same via Udev rules. I already use udev rules in /etc/udev/rules.d/60-raw.rules to set permissions on these devices, i.e.
ACTION=="add", KERNEL=="raw*", OWNER=="sybase", GROUP=="sybase", MODE=="0660"
That works fine. I even set symbolic links:
KERNEL=="raw1", SYMLINK+="vg01/rtempdb"
KERNEL=="raw2", SYMLINK+="vg01/rtestdb1"
KERNEL=="raw3", SYMLINK+="vg01/rfakedb2"
But I cannot seem to get the actual device creation piece to work within udev (it only works using rawdevices). I've tried:
ACTION=="add", KERNEL=="vg01/tempdb", RUN+="/bin/raw /dev/raw/raw1 %N"
No errors, but nothing happens. The device just doesn't create. I've also tried doing it by passing major and minor numbers. Is it possible to get all of this into udev rules or am I stuck with rawdevices? I'm also utterly confused as to the future of rawdevices... the raw man page said it was deprecated, and now at v5.5 it has that piece taken out. Also RHEL 5.3 dropped support for rawdevices in initscripts only to add itback in 5.4. I'm an admin, not a DBA, so I cannot say if this is a bad or good way, only that it is the way the vendor supports and recommends, so it is the way that I must go... just trying to make it work as "un-deprecated" and cleanly as possible.
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Jan 11, 2010
I am planning on setting up a 4x1TB RAID5 with mdadm under Ubuntu 9.10. I tried installing mdadm using "sudo apt-get install mdadm", all worked fine except for the following error: Code: Generating array device nodes... /var/lib/dpkg/info/mdadm.postinst: 170: /dev/MAKEDEV: not found failed. The end result is the /dev/md0 device has not been created, as can be seen here:
Code: windsok@beer:~$ mdadm --detail /dev/md0 mdadm: cannot open /dev/md0: No such file or directory After googling, I found the following bug which describes the issue: [URL] However it was reported way back in April 2009, and it does not look like it will be fixed any time soon, so I was wondering if anyone knows a workaround for this bug, to get me up and running?
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Apr 27, 2010
I try to configure openvpn under Fedora, using TUN/TAP device. I configured it under windows without the problems. However in windows this device is TAP-WIN32 device with the name VPN-urs. It set set in client.ovpn file as:
Code:
# Windows needs the TAP-Win32 adapter name
# from the Network Connections panel
# if you have more than one. On XP SP2,
# you may need to disable the firewall
[Code]....
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May 21, 2010
I need to prevent udev from creating the /dev/v4l/by-path/* and /dev/v4l/by-id/* files upon connecting my webcam. The problem is that Kopete doesn't want to display the video if these files are present. It works fine if I remove them, but I'd rather not have them created in the first place, since they seem to be completely useless anyway.
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Mar 19, 2011
I just tried creating a raid Device which has both stripping and mirroring i have done as below Quote:
mdadm -C /dev/md00 -l1 -n2 /dev/sda7 /dev/sda8
mdadm -C /dev/md01 -l1 -n2 /dev/sda9 /dev/sda10
mdadm -C /dev/md02 -l0 -n2 /dev/md00 /dev/md01
pvcreate /dev/md02
vgcreate volgroup02 /dev/md02
lvcreate -n orac -L 9G volgroup02
[Code]...
Everything is fine until here but after reboot the device wont mount on /orac it says special device not available i found that that md02 device is not in active state
i tried deleting it and recreating it but no use still it wont persist a reboot
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