APC for PHP better performance:

APC is a op-code caching for PHP. Once PHP code is run, APC caches the complied PHP code so for next time, time for compiling PHP will be reduce and gives faster performance. APC caches files in memory so performance of PHP code improves significantly.

Installing APC:

Make sure PHP is installed first 🙂 . we need to install few pre-requist for PHP.

$ yum install php-pear php-devel httpd-devel pcre-devel gcc make

$ pecl install apc

Configuring APC:

Open APC config file and make sure you have atlest following configuration:

vi /etc/php.d/apc.ini

Enable APC for php.

 extension=apc.so
 apc.enabled=1

The number of seconds a cache entry is allowed to idle in a slot before APC dumps the cache.

 apc.ttl=72000
 apc.user_ttl=72000
 apc.gc_ttl=3600

Size of memory for apc ( 1024 M)

apc.shm_size=1024M

Enable apc stats.

apc.stat=1

Enable APC for command line php operations.

apc.enable_cli=1

Allow 2 seconds after a file is created before it is cached. This will prevent premature PHP pages to get cached.

apc.file_update_protection=2

Maximum size of single file that apc can store.

apc.max_file_size=1M

Maximum number of files APC can store ( rotation).

apc.num_files_hint=200000

Maximum number of users data entries that APC can store.

apc.user_entries_hint=20000

You can put your configuration in php.ini file but i prefer to have separate file like above for configuration. Values mentioned above are for demonstration purpose, different values for APC can be set which depends on number of PHP pages, size of memory in server, number of page hits e.t.c

Restart httpd server:

service httpd restart

APC installation comes with apc.php file, which can be use to monitor APC performance. This file can be found inside APC package OR can be download from http://pecl.php.net/package/APC ( unzip and look for apc.php file).

Once apc.php is downloaded copy it to your domain so that you can assess it.

Now from browser, you can go to http://domain.com/apc.php. I prefer to wait for a day to see the APC performance so we can have clear idea how well our configuration did.

Sample output of APC:

apc1
Here, we clearly see that APC is not performing very well as we have 44% misses. To optimize this we can reduce the memory and also we can increase max_file_size and also TTL time so that more can be cached in APC. Normally when missed rate is more than 10% , its better to reconfigure the settings of APC.

Well tuned APC will look like below:

How add ftp users to folder or Apache server?

In this example we will create ftp group , ftp user and add it to the new or existing folder for ftp.

Step 1: If we already have group then we can skip this or lets start by creating a group, and lets call it ftpgroup

$ groupadd ftpgroup

Step 2: Create a user called ftpuser and add it to the group and also assign it with the folder. If folder is not assign default folder will be assigned which is normally /home/username

$ useradd userftp -p your-password -g ftpgroup -d /home/ftpfolder -s /bin/false

Normally ftp users dont need shell access so -s /bin/false.

Step 3: Set ownership.

chown ftpuser:ftpgroup /home/ftpuser

And you are done.

If we need more user to be added to already existing ftp folder then we can do as follows:

Add new user to existing ftp group:

$   useradd newftpuser -p your-password -g gtpgroup -d /home/ftpfolder -s bin/false

Note: we can modify user anytime with the usermod eg:

$ usermod - d /home/differentlocation

When we add new user to the group, we need to logout and login to the system, otherwise new user will not able to do ftp. If we dont want to logout/login then we can run following command to the folder.

chmod -R ugo+rw /home/ftpfolder

Extra: Limiting ftp users to their permitted folders:

To limit ftp users not able to go to top level folder we can do..sdfsdfdsf

if ftp server is vsftpd then make you have following un -commented or set.

vi /etc/vsftpd/vsftpd.conf

set :

chroot_local_user = yes

local_enable = Yes

and don’t forget to restart

service vsftpd restart

FTP users for web server like Apache:

If you are creating ftp for web users then make user user group is also apache else files uploaded by users will not be run by apache. So we can add multiple group to the users as follows:

usermod -a -G apache,group2 ftpuser

This step should work, but still you may not able to edit/create files because
When adding a user to a new group, that won’t be applied in any currently-running processes, only new ones. You need to log out and then log back in.
To fix this you can either logout and login or do the following command for your directory.

 chmod -R ugo+rw sit3

this will give access to the group / user to read /write to the folder.

How To Tutorials

PHP, ASP, .Net, Linux, SEO

Apache

How to install APC in centos for PHP better performance ( opcode)

APC for PHP better performance:

Installing APC:

Configuring APC:

Restart httpd server:

Linux: How to create ftp user?

How add ftp users to folder or Apache server?

If we need more user to be added to already existing ftp folder then we can do as follows:

FTP users for web server like Apache:

APC for PHP better performance:

Installing APC:

Configuring APC:

Restart httpd server:

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How add ftp users to folder or Apache server?

If we need more user to be added to already existing ftp folder then we can do as follows:

FTP users for web server like Apache:

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