Bowlero » Linux

Phpmyadmin Problem! Internal Server Error

noel — Tue, 10 Mar 2009 08:11:46 +0000

I encountered this problem. I was using phpmyadmin and I keep on getting “Internet Server Error” whenever I browse records.

I tried resetting mysql service using “service mysqld restart”, it didn’t work. I tried rebooting the mysql server but it didn’t work either.

I later on found out that clearing your browser’s cookies will do the trick. So try clearing your cookies and see if it works for you.

How to find the largest files or directories in Linux?

noel — Mon, 08 Sep 2008 01:23:53 +0000

My VPS disk usage is already 96% so I have to find a way to search for the largest files/directories in Linux and check if they should be deleted or not. Â I’m sure I can find files such as web log files which I can delete.

There isn’t any 1 linux command to do this but you can string a couple of commands to do the job. Here’s what I use.
# du -a /home | sort -n -r | head -n 300

du : Estimate file space usage
sort : Sort lines of text files or given input data
head : Output the first part of files i.e. to display first 10 largest file

Better yet, you can run it in your background using this

# du -a /home | sort -n -r | head -n 300 > spacehog.txt &

This will create a text file called spacehog.txt which you can review later after the background process finished.

How to Send Mail from PHP via SMTP

noel — Thu, 24 Jul 2008 03:04:42 +0000

I was working on a project and needed to send mails via php using an SMTP server. Â Â It seems that Fedora doesn’t have this built in when I installed my linux box.Â Â So anyway, for those people who are searching for information on how to send mail from php via SMTP,Â below are the steps.

Step # 1: DownloadÂ Pear Packages for Mail, Net_SMTP, and Net_Socket


# cd /tmp

# wget http://download.pear.php.net/package/Mail-1.1.14.tgz

# wget http://download.pear.php.net/package/Net_SMTP-1.2.10.tgz

# wget http://download.pear.php.net/package/Net_Socket-1.0.8.tgz
Untar all files:
# tar -zxvf Mail-1.1.14.tgz

# tar -zxvf  Net_SMTP-1.2.10.tgz

# tar -zxvf  Net_Socket-1.0.8.tgz
 Step#2:Â  Copy the files to /usr/share/pear
# cd /usr/share/pear

# mkdir Net

# cd Net

# cp /tmp/Net_SMTP-1.2.10/SMTP.php .

# cp  /tmp/Net_Socket-1.0.8/Socket.php .

# cd ..

# cp -avr /tmp/Mail-1.1.14/Mail/  .

# cp -avr /tmp/Mail-1.1.14/Mail.php .
You're Done!
Now to test, try this small php program.

include("Mail.php");

/* mail setup recipients, subject etc */

$recipients = "yournamehere@domain.com";

$headers["From"] = "from@yourdomain.com";

$headers["To"] = "receipient@theirdomain.com";

$headers["Subject"] = "test via smtp";

$mailmsg = "Hello, This is a test.";

/* SMTP server name, port, user/passwd */

$smtpinfo["host"] = "smtp.yourserver.com";

$smtpinfo["port"] = "25";

$smtpinfo["auth"] = true;

$smtpinfo["username"] = "test";

$smtpinfo["password"] = "test";

/* Create the mail object using the Mail::factory method */

$mail_object =& Mail::factory("smtp", $smtpinfo);

/* Ok send mail */

$mail_object->send($recipients, $headers, $mailmsg);

?>


Now check your email and see if it worked!



Fedora Core 9 Alpha Now Available
noel — Wed, 06 Feb 2008 15:48:20 +0000
Fedora Core 9 Alpha is now available.  Note that this isn’t the final FC9 release.  This is the Alpha release.
Some of highlights of Fedora 9 Alpha:

GNOME 2.21 Development Release
KDE 4.0
Firefox 3 Beta 2
Support for resizing ext2, ext3 and NTFS partitions during install
Support for creating and installing to encrypted filesystems
PackageKit
Kernel 2.6.24

And numerous other improvements and enhancements.
The final release is set to happen on April 29, 2008.   Should you want more details of the release schedule of FC9, check this out.
The Alpha release is available both through our mirroring system and

via bittorrent.
In Fedoraproject.org  here’s the download link:
http://fedoraproject.org/get-prerelease
For direct http access to a local mirror:

http://download.fedoraproject.org/pub/fedora/linux/releases/test/9-Alpha/
For a list of mirrors carrying the content and the various protocols

they support:

http://mirrors.fedoraproject.org/publiclist/Fedora/9-Alpha/
For bittorrent:

http://torrent.fedoraproject.org/



Backup and Restore MySQL Database Using Command Line
noel — Tue, 29 Jan 2008 15:35:02 +0000
Method 1   (Long Method)
mysqldump -u USER -pPASSWORD DATABASE > filename.sql
copy the file to the new host and restore using
mysql -u USER -pPASSWORD  DATABASE < filename.sql
Method 2 (short method)
mysqldump –opt –compress –user=USERHERE –password=PWHERE

–host=SOURCE.HOST.HERE SOURCE_DB_NAME | mysql –user=USERHERE

–password=PWHERE –host=TARGET.HOST.HERE -D TARGET_DB_NAME -C

TARGET_DB_NAME



ISPConfig  Conflict with Fedora Core 7 and Fedora Core 8
noel — Tue, 29 Jan 2008 10:08:00 +0000
I was installing ISPConfig to a Fedora Core 7 Installation but when I rebooted,   it shows a black screen with a cursor that appears to be “busy”.     Logging in remotely via ssh seems to be working but when I check out which process was “hanging” by issuing the “top” command,  I see that  gdmgreeter seems to be using up a lot of CPU resource.  About 70% to 90%.
After searching google for  “ISPconfig conflict”   “ispconfig gdmgreeter”   “ispconfig hang” and similar keywords,  the solution I found that worked best was to create/edit  the file called  “/etc/sysconfig/desktop”
vi /etc/sysconfig/desktop
and add the following two lines to the file /etc/sysconfig/desktop
DESKTOP=”GNOME”

DISPLAYMANAGER=”KDE”

After reboot,  everything works properly.    I believe this solution also works for Fedora Core 8.   Leave a comment if it worked for you.



Using HP printers in Linux (Fedora) –  HP linux driver
noel — Fri, 20 Oct 2006 17:22:07 +0000
We’re trying to run an HP4355 all in one fax,scan,copy,print printer in linux (Fedora Core 5).  As you know, one of the biggest challenges with using linux is searching for drivers.
I’ve found a great application in sourceforge that supports many HP printers in linux.  Its called HP Linux Imaging and Printing (http://hplip.sourceforge.net).
Configuring HP for linux was easy using hplip.  You might need to connect your printer to the internet as there is a point where it will download (via yum) development packages from the internet.
You can then use CUPS to add the device and manage the printing.  CUPS has a web management interface at (http://localhost:631).





How to run Xwindows in WinXP
noel — Fri, 20 Oct 2006 17:14:24 +0000
I was playing around with linux today and thought about running an application in a linux box while displaying the window in WinXP.   Yeah doing a ssh from WinXP will work for command line and non-Xwindows applications, but how about if its an Xwindows application? After a few minutes on the internet, I found a good solution. It’s called Cygwin.
Cygwin is a set of powerful tools to assist developers in migrating applications from UNIXÂ®/Linux to the MicrosoftÂ® WindowsÂ®; platform.  Cygwin/X is the port of X Window System to Cygwin.

I downloaded cygwinx and followed the cygwin/X installation guide .  An important note to remember is this…
You may also want to ensure that the inetutils and openssh packages are selected if you wish to use telnet and ssh to connect to remote machines. 
So after installation, I fired up cygwin and I was given a shell prompt.  Here’s what I did next.
1. I started Xwindows (I used the command ‘startx‘), and another window opened up.
2. I typed ssh -Y -l  user remote-ip   to login as user in the remote machine where the Xwindows application resides
3. Once I was able to login,  I just run the application in the linux shell.   You can try running xterm, or xclock and the application will be shown on your Windows Box.
The nice thing about running an application in the linux box is that you don’t use your WinXP’s resources.  Since the  application is running in the linux box, it utilized the linux box’s resources (ie memory, diskspace).
It also allows you to have the freedom to use one machine and manage things remotely.