drop_caches

Writing to this will cause the kernel to drop clean caches, dentries and inodes from memory, causing that memory to become free.

To free pagecache:

echo 1 > /proc/sys/vm/drop_caches

To free dentries and inodes:

echo 2 > /proc/sys/vm/drop_caches

To free pagecache, dentries and inodes:

echo 3 > /proc/sys/vm/drop_caches

Source : http://www.linuxinsight.com/proc_sys_vm_drop_caches.html

I increase the “file_uploads” to 150MB. When I try upload 18MB file use my application it’s just show me a blank page without any error, then I look error log file and found something

POST Content-Length of 18248964 bytes exceeds the limit of 8388608 bytes in Unknown on line 0

I found that I also need increase the ‘post_max_size’ to 150MB on php.ini. Yup my application work fine now, glad to see this

reference : http://codeigniter.com/forums/viewthread/127502/

Today I re-check the BIOS configuration, under System Setting the only option of SATA drive is “configure SATA as IDE” and I try change the mode from “Compability Mode” to “Native Mode”. I save the BIOS configuration and reboot the server, and the result is very fantastic, now my two harddrive detected as SATA, it recognized as sda and sdb , I am very right now. I test with “hdparam” the speed impressive

/dev/sda:
Timing cached reads:   27160 MB in  1.99 seconds = 13620.52 MB/sec
Timing buffered disk reads:  338 MB in  3.02 seconds = 112.07 MB/sec

These day I just realized that my cache HIT is limited so my Mikrotik count the cache HIT. On Mikrotik 2.9 we use TOS for packet mangle and it’s value is 0×30 (Hexadeciamal) or 48 in decimal. I watched the data packet for cache hit mangle and the value to small rather when I saw on squid log HIT.

After googling , I found that on Mikrotik 4.x, the TOS value is not same as Mikrotik 2.9 even on Mikrotik 4.x also written as DSCP (TOS).  So I start search the algorithm converting TOS on Mikrotik 2.9 to DSCP (TOS) on Mikrotik 4.x. So here’s the table :

DSCP TOS

0        0
1         4
2        8
3        12
4        16
5       20

Source : http://forum.mikrotik.com/viewtopic.php?f=1&t=19826

Just divide the TOS from Mikrotik 2.9 by 4 and insert the value on DSCP (TOS) on Mikrotik 4.x , you mangle rule will work like a charm

Finally I know, when on asterisk installation process, it change user who run httpd / webserver to user asterisk from user apache. So this will make  of trouble of permission . Then the solution I change the ownership of web file from apache to asterisk. The application seem working perfect now, puiff …..

1. Use ulimit to make Red5 server start normaly , event it use high performance
2. During this installation I found interesting command for linux , sync; echo 3 > /proc/sys/vm/drop_caches , it will clear RAM cache, if we need to clear linux memcache
3. After access install page process (http://host:5080/openmeetings/install) we need to change the database and table char set to UTF-8 that already created automatically by hibernate process.
4. The method of char set changing, I export the database to SQL file, change the charset to UTF-8 using text editor, I drop the table that already created then I import modified SQL file to database.

Running on Linux
Starting Red5
Error occurred during initialization of VM
Could not reserve enough space for object heap
Could not create the Java virtual machine.

After hour searching I found that the system limit memory usage, so the Red5 that based on java won’t start. Use ulimit command will resolve it, ah then we go to next step

ulimit -n 4096 -u 14335 -m unlimited -d unlimited -s 8192 -c 1000000 -v unlimited 2>/dev/null

This solution may be used for other application that give same error message

http://mirror.centos.org/centos/5/os/i386/CentOS/perl-URI-1.35-3.noarch.rpm

Install it manually using rpm -ivh perl-URI-1.35-3.noarch.rpm

After it finish, then we can install svn by using this command

yum install subversion

Yup , that’s it

Mail sent by user nobody being discarded due to sender restrictions in WHM->Tweak Settings

After couple time trying, I found the error was generated when I use ‘mail’ PHP function. When we use mail() function to send email, we got “Sender: Nobody <nobody@yourhosting.com>” in email header. And that’s why my email always discarded by my hosting mailer.

I change the email send method by using SMTP ( using fsockopen() ). Because I use CodeIgniter , the email send code will be like this :

$this->load->library('email');
$config['useragent'] = 'Code-Igniter-Mailer-^^'
$config['mailtype'] = 'text'
$config['validate'] = TRUE;
$config['protocol'] = 'smtp'
$config['smtp_host'] = 'localhost'
$config['newline'] = "\r\n";
$this->email->initialize($config);

$this->email->initialize($config);
$this->email->from('youremail@yourdomain.com', 'Your Name');
$this->email->reply_to('youremail@yourdomain.com', 'Your Name');
$this->email->to('someemail@somedomain.com');
$this->email->subject('Email Subject');
$this->email->message('Your Message Here.');
$this->email->send();