HappyLife.sg

As I am storing backup remotely, I used GPG to encrypt my stuff on-the-fly using duplicity.

Due to the upgrading of the current machine to a more powerful machine, I need to move my GPG keys too.

Here is how I do it.

List the available GPG key in the store.

 
[root@svr ~]# gpg --list-keys
/root/.gnupg/pubring.gpg
------------------------
pub   1024D/A1FC0247 2011-01-07
uid                  tanfwc <tanfwc @happylife.sg>
sub   2048g/F96387B6 2011-01-07
</tanfwc>

Let’s export the keys accordingly.
Continue reading ‘Migrating GPG keys’ »

As I am installing Cluster Glue, I bump into the following error. I was looking around the Internet and unable to find a answer thus I have to look into what package CentOS build libuuid into

Problem:

./.libs/libplumb.so: undefined reference to `uuid_parse'
./.libs/libplumb.so: undefined reference to `uuid_generate'
./.libs/libplumb.so: undefined reference to `uuid_copy'
./.libs/libplumb.so: undefined reference to `uuid_is_null'
./.libs/libplumb.so: undefined reference to `uuid_unparse'
./.libs/libplumb.so: undefined reference to `uuid_clear'

Solution:

yum install -y e2fsprogs-devel

Hope the above helps someone out there.

WARNING: The following steps will stop your network interface, please ensure that you have KVM-Over-IP before attempting to do it remotely.

If you ever had to change the bonding type while the server is live, follow the steps:

[db2:/root]# ifdown bond0
[db2:/root]# modprobe -r bonding
[db2:/root]# modprobe bonding mode=1 miimon=100
[db2:/root]# ifup bond0
[db2:/root]# cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v3.4.0 (October 7, 2008)
 
Bonding Mode: fault-tolerance (active-backup)
Primary Slave: None
Currently Active Slave: eth2
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0
 
Slave Interface: eth2
MII Status: up
Link Failure Count: 0
Permanent HW addr: 
 
Slave Interface: eth3
MII Status: up
Link Failure Count: 0
Permanent HW addr:

Hope this helps someone out there.

As I am working on a project where I need to play external audio into a application, as you are aware that dealing with audio in Linux can be challenging.

As such, here is a simple solution to it =)

My test environment:
CentOS 5.5 64bit
Creative Blaster S80490 (USB)

yum install -y alsa-utils

Once I installed Advanced Linux Sound Architecture (known as ALSA), I can run the following command to see whether my audio is detected by the system.

[root@localhost src]# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: External [SB Live! 24-bit External], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

I got my audio devices detected by the Linux system. So now, I can move on to the next stage of integrating into my applications now.

Hope this helps someone out there…

Had a friend who want to backup all his files (300GB+) from a Linux server to a laptop harddisk, we hit with a error message that cause Linux unable to mount the shared folder in laptop.

Problem:

[root@localhost ~]# mount -t cifs "//192.168.1.10/abc" -o username=admin,password=1234
ed /mnt/laptop/
mount: Cannot allocate memory

The server has at least 3GB cached RAM available in the memory pool. So that’s not possible with memory issues.

Take a look at dmesg and you should see this error

Oct  3 00:33:18 localhost kernel:  CIFS VFS: Send error in SessSetup = -12
Oct  3 00:33:18 localhost kernel:  CIFS VFS: cifs_mount failed w/return code = -12

If you have the above error, most likely it is due to your Windows 7 machine. Let’s move to the Windows 7 and troubleshoot.
Continue reading ‘Windows 7 cause “mount: Cannot allocate memory”’ »

I was about to head to bed when I receive a disturbing email from my BlackBerry phone.

A email from weekly cron.d send me this:

WARNING: mismatch_cnt is not 0 on /dev/md0

A quick command shows that the RAID array (md0) is the number of
unsynchronized blocks in the raid.

As you can see below, md0 is having 128 count of unsynchronized blocks.

[svr4:/root]# cat /sys/block/md0/md/mismatch_cnt
128
[svr4:/root]# cat /sys/block/md1/md/mismatch_cnt
0

Let’s attempt to fix it.
Continue reading ‘WARNING: mismatch_cnt is not 0 on /dev/md0’ »

Problems:

sd 0:0:0:0: WARNING: (0x06:0x002C): Command (0x2a) timed out, resetting card.
3w-9xxx: scsi0: AEN: INFO (0x04:0x005E): Cache synchronization completed:unit=0.
sd 0:0:0:0: WARNING: (0x06:0x002C): Command (0x28) timed out, resetting card.
3w-9xxx: scsi0: AEN: INFO (0x04:0x005E): Cache synchronization completed:unit=0.

As I am facing soft-reset on my controller card, the latest version of the firmware will fix the problem.
Continue reading ‘3ware Controller soft-reset’ »

To reset lxadmin, you can do through SSH with just two commands.

cd /usr/local/lxlabs/lxadmin/httpdocs
lphp.exe ../bin/common/resetpassword.php master mypassword

Enjoy!

Sometimes if you suspect your file system is corrupted, you might want to run fsck to check against the file system. You just need to create a simple file at the root partition.

touch /forcefsck
reboot

Simple and easy =)

[adserver1:~]# service mysql start
Starting MySQL..Manager of pid-file quit without updating file [FAILED]

A silly mistake by me as I forget to disable the selinux after a fresh installation of a ad server =)

Hope this helps …