Fog Tweaks

Tweaks

• The following sections are devoted to strictly performance. If there are always pros and cons when tweaking to read carefully. All Pros/Cons should be added.
• ALL these Settings must be changed by the FOG User. If tested continuously and fully approved then these may make it into the Default Setup of fog.
• DO AT YOUR OWN RISK
• Pros description of the good
• Cons description of the bad
• PvC A rating scale of 1 to 10, 1 being the ALL Con and 10 being ALL Pro
• Dev. Approved One or multiple developers of Fog has approved this setting to be used in most if not all installations of FOG. ✔ Approved or ✖ Denied

---

Persistent DB Connection

• Use a Persistent DB Connection. This uses the already established connection to get the data, rather than reopening the socket or TCP link
  1. Open this file /var/www/fog/lib/fog/Config.class.php
  2. Go to line:

     define('DATABASE_HOST',         'localhost');

  3. Change to:

     define('DATABASE_HOST',         'p:127.0.0.1');

  4. Restart mysql:

     service mysql restart

  5. Open this file /opt/fog/.fogsettings (so updates/upgrades to overwrite the settings above)
  6. Go to line:

     snmysqlhost="";

  7. Change to:

     snmysqlhost="p:127.0.0.1";

• If your DB is on another server, use p:[ipaddress of DB server].

---

PHP Session Purging

• Known bug in Ubuntu's config. It's running fuser for each PHP session file easily racking up thousands of processes.
• Look for and purge old sessions better
  1. Open this file /etc/cron.d/php5
  2. Go to line:

     09,39 *    * * *    root  [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir fuser -s {} 2>/dev/null \; -delete

  3. Change to:

     09,39 *    * * *    root  [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) -delete

  4. Restart apache

     service apache2 restart

---

Updating Script

• For Beta and frequent updaters ONLY!
• ✖ Denied due to this only applying to a small select group.
• In Fog v1.3.0-r2759+ the init's and kernels are downloaded at install thus "slowing" the install process.
• When doing constant updates a quicker means to update would be to copy the files you need.

• 1. Step one make a backup of the original:
  2. Run this script:

• Ubuntu/Debian installs

 sudo cp /var/www/fog/lib/fog/Config.class.php ~/Config.class.php #backup  current config file.
 sudo rm -rf /var/www/fog.prev #removes the original previous folder if it exists.
 sudo mv /var/www/fog /var/www/fog.prev #moves the current into fog.prev for backup
 cd /loc/of/svn/folder/trunk; svn up #update the trunk to the latest
 sudo cp /loc/of/svn/folder/trunk/packages/web /var/www/fog #copy the new svn gui to the system.
 sudo chown -R www-data:www-data /var/www/fog; sudo chown -R fog:www-data /var/www/fog/service/ipxe; #change permissions to appropriate values.
 sudo cp ~/Config.class.php /var/www/fog/lib/fog/Config.class.php #copy back config

• RedHat installs

 cp /var/www/html/fog/lib/fog/Config.class.php ~/Config.class.php #backup  current config file.
 rm -rf /var/www/html/fog.prev #removes the original previous folder if it exists.
 mv /var/www/html/fog /var/www/html/fog.prev #moves the current into fog.prev for backup
 cd /loc/of/svn/folder/trunk; svn up #update the trunk to the latest
 cp /loc/of/svn/folder/trunk/packages/web /var/www/html/fog #copy the new svn gui to the system.
 chown -R apache:apache /var/www/html/fog; sudo -R fog:apache /var/www/html/fog/service/ipxe; #change permissions to appropriate values.
 cp ~/Config.class /var/www/html/fog/lib/fog/Config.class.php #copy back config

---

Bonding Multiple NICs

• Setup a bond where multiple network cards are combined to look like a single NIC for increased throughput and redundancy.
• Bonding Multiple NICs
• ✖ Denied due to only working with some hardware
• Constant bug complains in Ubuntu for this setting

---

Results

Option	Pros	Cons	PvC	Dev. Approved
Persistent DB Connection	Speed in Web GUI response time	Connection is always open	9	✔
PHP Session Purging	Purges Old sessions Better	None	10	✔
Updating Script	Updates FOG without Kernels and init downloads	May not have most up-to-date Kernels and init	9	✖
Bonding Multiple NICs	Increases Redundancy or Throughput	Only works with some hardware	5	✖