Archive for the ‘Troubleshot’ Category


Plain and simple of how to extend a volumn group in RHEL

Amusing you already added a Virtual disk and its presented to the server . If not check my this post.

[root@aurhel05 ~]# fdisk /dev/sdb

The number of cylinders for this disk is set to 3916.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): p

Disk /dev/sdb: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System

Command (m for help): n
Command action
e   extended
p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-3916, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-3916, default 3916):
Using default value 3916

Command (m for help): p

Disk /dev/sdb: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1        3916    31455238+  83  Linux

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
[root@aurhel05 ~]# fdisk -l

Disk /dev/sda: 32.2 GB, 32259548160 bytes
255 heads, 63 sectors/track, 3922 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1         131     1052226   83  Linux
/dev/sda2             132         784     5245222+  83  Linux
/dev/sda3             785        1437     5245222+  83  Linux
/dev/sda4            1438        3918    19928632+   5  Extended
/dev/sda5            1438        1698     2096451   83  Linux
/dev/sda6            1699        1959     2096451   82  Linux swap / Solaris
/dev/sda7            1960        2220     2096451   82  Linux swap / Solaris
/dev/sda8            2221        2481     2096451   83  Linux
/dev/sda9            2482        2612     1052226   83  Linux
/dev/sda10           2613        3918    10490413+  83  Linux

Disk /dev/sdb: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1        3916    31455238+  83  Linux

[root@aurhel05 ~]# mkfs.ext3 /dev/sdb1

mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
3932160 inodes, 7863809 blocks
393190 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
240 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000

Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 25 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

Extending the Volume VolGroup00-mysqldb by another 30GB :

1. Create a physical volume from a free disk or partition (e.g. /dev/sdb1 as a partition)
# pvcreate /dev/sdb1

2. Extend the volume group
# vgextend VolGroup00 /dev/sdb1

3. Extend the logical volume
# lvextend -L +30G /dev/mapper/VolGroup00-mysqldb

4. Extend an ext2/3/4 filesystem on the logical volume.
# resize2fs /dev/mapper/VolGroup00-mysqldb

 

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Was trying to kickstart a RHEL5 this morning from CDROM in a VM but it was comming up with the following error

“Could not find kernel image : linux ”

Solution :

with some time spent  I came accross with the following solution for temporary . Hope this helps.

vmlinuz initrd=initrd.img ks=cdrom:/rhel5-liab-server-x86_64.cfg cdrom


Problem :

I dont use CUPS for printing that much but I have to set it up for some of our development guys . It was working ok and I am kinda start loving it 😦 . Hence one of the server is comming up with error while printing . It is basically comming as “Segmentation Fault”

I got more error from the following location .

/var/log/cups

localhost – root [05/Aug/2010:11:05:06 +1000] “POST /printers/AUHOPRN01 HTTP/1.1” 200 18602 Print-Job client-error-not-possible
localhost – root [05/Aug/2010:11:05:06 +1000] “POST /classes/AUHOPRN01 HTTP/1.1” 200 18601 Print-Job client-error-not-possible

Solution :

Tried to restart Cups to get rid of the problem but it was failing each time .Then I have cleared the queue  with: sudo lprm – and it starts working ok .

Still need to find out more . This is for a heads up.


Problem :

I added one of no use syntax in /etc/fstab and  after reboot to single mode and then use vi to edit /etc/fstab that display this file
is read-only mode, so I cannot edit it ….. now I cannot go back to  normal boot up.

Solution :

In Single user mode type the following ,

mount -o remount,rw /

Then vi /etc/fstab and then you will be able to amend the file again .