Imminent Web Services

$ sudo -s

# mkdir -p /mnt/disk

# mount -o loop disk1.iso /mnt/disk

# cd /mnt/disk

# ls -l

Reference: http://www.mikerubel.org/computers/rsync_snapshots/

Below is a backup script for backing up /home to /mnt/usb1/backup using rsync.

This article on ubuntugeek gives a nice tutorial on how to rip DVD audio to mp3 or ogg.

Besides apt-get, the packages lsdvd and transcode are available in yum and portage as well.

We were not able to install the CPAN module Net::Packet. The error messages indicated that it could not find Net::Libdnet module.

Next, we tried to install Net::Libdnet, but got the error "Libdnet.xs:37:18: error: dnet.h: No such file or directory". That means, we are missing a libdnet.

So, we installed libdnet through yum (from "epel" repos):

# yum install libdnet libdnet-devel

("epel" repos is the Fedora extra package repos).

This blog http://gfwrev.blogspot.com has some study result on GFW. It's in Chinese. Maybe oneday we will find some time and translate some of it into English.

This discussion http://www.perlmonks.org/?node=108244 explains nicely that we need to do shutdown and close after we are done with a socket:

shutdown on a socket is similar to close on a pipe in what information it gives to the program on the other side. But it does not close the file handle.

If you use Firefox/Thunderbird in Mac OS, you still need to untrust the CNNIC certs follow the steps in Screenshot: Remove CNNIC from Firefox and Thunderbird.

In Mac OS X: Click Applications -> Utilities -> Keychain Access -> Certificates -> (expand with V button below) -> System Roots -> (Unlock, top left) -> Double-click the cert -> Trust -> When using this Certificate -> Never Trust.

Instead of removing CNNIC certificates from your system, we should mark them as "untrusted". This way, when your system updates its cerficates, they will not slip in. As a precaution, you might need to form the habit of checking the trusted certficates installed in your system periodically.

I tried to install this module WWW::Curl via cpan, but failed on both Centos 4 and Centos 5. Instead of digging for the fix, I just enabled rpmforge repository, and installed through yum:

# yum install perl-WWW-Curl

Mozilla and Microsoft have added CNNIC root CA to the browser's Authorities and CA directory. Chinese users are in a rush removing them from their computers. Here is a post on how to do it (in Chinese).

Discussions can be found here: