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Linux

Dist Switch

by on Jul.26, 2011, under CentOS, Linux

Switched to CentOS 6 as my primary Linux OS.  Fedora is getting the boot after many, many, years of use.  Fedora 15 just has too many things that are wrong with it.  In all fairness, some of the issues are with the path Gnome and Linux has taken in general.  It was a good run.

 

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TPVMLPD: Device type not supported

by on Jun.28, 2011, under Linux, VMware

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2001254
Linux virtual machine reports the error: TPVMLPD: Device type not supported

Symptoms

  • Virtual machine running Linux reports the error:TPVMLPD: Device type not supported

Resolution

This error is reported when the TPVMLPD process is running on the Linux virtual machine. TPVMLPD is a thinprint daemon that is installed with VMware Tools.
 
To resolve this issue, you must stop the TPVMLPD daemon by modifying the vmware-tools startup script.
 
To modify the vmware-tools startup script:
  1. Take a backup of the vmware-tools startup script using the command:cp /etc/init.d/vmware-tools /etc/init.d/vmware-tools.backup
  2. Open the /etc/init.d/vmware-tools script using a text editor. For example, to open the script using the vi editor, run this command:vi /etc/init.d/vmware-tools
  3. Comment this entry:#/usr/bin/tpvmlpd
  4. Run this command to restart VMware Tools:/etc/init.d/vmware-tools restart


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Google Toolbar Disabled by Firefox 5

by on Jun.27, 2011, under Linux, Windows

How to re-enable the Google Toolbar in Firefox 5.

Solution: Change maxVersion in the install.rdf file to 5.*. Do a search if your not sure where the file is located.

Linux:

– Edit ~user/.mozilla/firefox/mhznvz4j.default/extensions/\{3112ca9c-de6d-4884-a869-9855de68056c\}/install.rdf

– Change <em:maxVersion>4.*</em:maxVersion> to <em:maxVersion>5.*</em:maxVersion> and save.

– Start Firefox. Toolbar should start normally.

Windows:

The same ./extensions/\{3112ca9c-de6d-4884-a869-9855de68056c\}/install.rdf file can be edited in Windows to restore the Google Toolbar.

Or:
about:config
nightly.disableCheckCompatibility=false
extensions.checkCompatibility=false

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Move LVM Volume Group To New Larger Drive

by on May.09, 2011, under Linux

Shutdown server and add new drive to system, then after power on:

fdisk /dev/sdb # set partion type to 8e
pvcreate /dev/sdb1
vgextend Volume00 /dev/sdb1
pvmove -n /dev/mapper/Volume00-external /dev/sda2 /dev/sdb1
lvextend -L +47G /dev/mapper/Volume00-external
ext2online /dev/mapper/Volume00-external

sdb=New Drive, Volume00=Volume Group, Volume00-external=Logical Volume
Support Commands: lvdisplay, vgdisplay sfdisk -s, df

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Create Additional Swap Space

by on May.05, 2011, under Linux

Use a File for Additional Swap Space

If you don’t have additional disk, you can create a file on your filesystem, and use the file for swap space.

Using dd, create a swap file with the name “swap_file” under /root directory with a size of 4096MB (4GB).

# dd if=/dev/zero of=/root/swap_file bs=1M count=4096
4096+0 records in
4096+0 records out
4294967296 bytes (4.3 GB) copied, 136.328 s, 31.5 MB/s

# ls -lh /root/swap_file
-rw-r–r– 1 root root 4.0G May 5 14:43 swap_file

Change the permission of the swap file so that only root can access it.

# chmod 600 /root/swap_file

Mark this file as a swap file using the mkswap command.

# mkswap /root/swap_file
Setting up swapspace version 1, size = 4194300 KiB no label, UUID=982c0db9-d522-4f08-a072-29168de28c64

Enable the newly created swapfile.

# swapon /root/swap_file

To make this swap file available as a swap area even after the reboot, add the following line to the /etc/fstab file.

# grep swap_file /etc/fstab
/root/swap_file swap swap defaults 0 0

Verify whether the newly created swap area is available for your use.

# swapon -s
Filename Type Size Used Priority
/dev/dm-1 partition 1048572 9272 -1
/root/swap_file file 4194300 0 -2

# free
total used free shared buffers cached
Mem: 508772 492700 16072 0 39384 311016
-/+ buffers/cache: 142300 366472
Swap: 5242872 9272 5233600

Note: In the output of swapon -s command, the Type column will say “file” if the swap space is created from a swap file.

If you don’t want to reboot to verify whether the system takes all the swap space mentioned in the /etc/fstab, you can do the following, which will disable and enable all the swap partition mentioned in the /etc/fstab.

# swapoff -a
# swapon -a

To increase swap by extending a Logical Volume:

# cat /proc/swaps
Filename Type Size Used Priority
/dev/mapper/Volume00-lv_swap partition 16777208 208 -1

# swapoff /dev/Volume00/lv_swap
# lvextend -L +900M /dev/Volume00/lv_swap
# mkswap /dev/Volume00/lv_swap
# swapon /dev/Volume00/lv_swap

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