sandip's blog

These are some notes I had taken down during the installation of Bugzilla on a server with ISPConfig hosting control panel:

Requirements:

Create Site:

Site was created via the ISPConfig control panel with "web6_bugs" as the admin user and "web6" as the group.

Install:

Apache with mod_perl need the below directives in httpd.conf:

Runs a lot faster, but is a memory hog. Suggested to turn off KeepAlive in apache when running mod_perl.

Crontab Entry:

Place the snippet of code in an index.php file to pull up a different web page for each domain pointed to the same web-space.

Notes on installing Alternative PHP Cache (APC):

1. Download and istall:
   
   $ wget http://pecl.php.net/get/APC-3.0.14.tgz
$ tar -xvzf APC-3.0.14.tgz
$ cd APC-3.0.14
$ phpize
$ ./configure --enable-apc
$ make
# make install
2. Add the below lines to the php.ini:
   
     extension=/path/to/apc.so
  apc.enabled=1
  apc.shm_segments=1
  apc.optimization=0
  apc.shm_size=128
  apc.ttl=7200
  apc.user_ttl=7200
  apc.num_files_hint=1024
  apc.mmap_file_mask=/tmp/apc.XXXXXX
  apc.enable_cli=1
3. Restart apache:
   
   # service httpd restart
4. Check phpinfo() to see if APC is enabled.
   
5. Copy the "apc.php" admin file in the source directory to a password protected web site directory. Edit "apc.php" top line to change password to something different from default.

Latest Compile with pdo drivers for mysql along with mod_security.

NOTE:
Remove the MySQL-shared rpm else openssl will not work.

Here's a quick bash script that I wrote to add adsense code just before the closing body tag in several accounts with the same file name. Could be modified to take the file names as the last argument if different.

Note: replace the UA-####### with your particular ID number assigned by adsense.

Allows for easy sharing of internet connection to an internal network with dynamic IP range.

1. Create RAID-1 level array with 2 active devices and 1 spare:
   
   # mdadm -C /dev/md0 -l 1 -n 2 /dev/hda{8,9} -x 1 /dev/hda10

   Note: RAID-1 provides for redundancy and needs a minimum of 2 partitions and any number of spares.

2. Show details:
   
   # mdadm --detail /dev/md0
3. Mark Faulty:
   
   # mdadm --manage /dev/md0 -f /dev/hda8

   Note: When partition is marked faulty, the spare quickly replaces it in RAID 1 array.

4. Remove:
   
   # mdadm --manage /dev/md0 -r /dev/hda8

   Note: Only faulty partitions can be removed.

5. Add:
   
   # mdadm --manage /dev/md0 -a /dev/hda8

   Note: Only removed partitions can be added.

6. Stop RAID:
   
   # mdadm --stop /dev/md0
7. Run RAID:
   
   # mdadm --assemble /dev/md0 /dev/hda{8,9,10}

   Note: Before assembling, check on the UUID of the devices. They should all be the same and show only one array:
   

   mdadm --examine --scan /dev/hda{8,9,10}

8. Remove the md signature from disk
   
   # mdadm --zero-superblock /dev/hda{8,9,10}
9. Scan md superblock
   
   # mdadm --examine --scan
10. Scan currently active arrays
    
    mdadm --detail --scan
11. Monitor RAID:
    
    # nohup mdadm --monitor --mail=root --delay=300 /dev/md0 &

If the below produces lm (long mode) flags, then the cpu has support for x86_64 architecture.

I have seen quite a few dedicated servers with support for x86_64 architecture, but i386 installed instead.

When doing a `uname -a`, the output misleads you to think that x86_64 is not supported. Such machines do not fully utilize the hardware resources and decreases performance of you box.

You might come across a disc image in the BIN/CUE format. BIN/CUE files can be directly burned to CD via K3B, however if you want to convert to an iso, a command line application called bchunk can be used.