PHP

Installing php-mbstring on RHEL6

Submitted by John on Tue, 2011-03-01 10:00

I wanted to install the mbstring PHP extension on Red Hat Enterprise Linux 6. But to my surprise, it wasn't there:

# yum install php-mbstring
Loaded plugins: rhnplugin
Setting up Install Process
No package php-mbstring available.
Error: Nothing to do

That's because the package is in the RHEL Server Optional repository.

I went into RHN and enabled the repository:

After doing yum update I could do yum install php-mbstring with no problems.

Topic: 
PHP
RHEL6

Installing PHP 5.2 (or 5.3) on RHEL5 the easy way

Submitted by John on Mon, 2010-11-08 08:27

Just replace the stock PHP with one from the IUS Community project.

wget http://dl.iuscommunity.org/pub/ius/stable/Redhat/5.5/x86_64/ius-release-1.0-6.ius.el5.noarch.rpm
rpm -Uvh ius-release-1.0-6.ius.el5.noarch.rpm
yum install yum-plugin-replace
rpm -qa | grep php
yum replace php --replace-with php52
/sbin/service httpd restart

Done!

Topic: 
PHP
RHEL5

Performance presentation, Des Moines Web Geeks

Submitted by John on Tue, 2009-09-22 09:07

Matt Nuzum, the webmaster of ubuntu.com, invited me to speak at the Des Moines Web Geeks meeting last night. The venue, Impromptu Studios, was a bit hard to find. There were no signs for Impromptu Studios, but after lurking in dark alleyways for a while I eventually discovered what should have been obvious from the beginning: enter the furniture store with the "Closed" sign on the front and go up the stairs past the disused lavatory with a sign on the door saying "Beware of the Leopard."

The group was great and we talked for about an hour and half about bottlenecks and optimization. I even went home with a Django book!

Since this was a diverse group I tried to talk about things that everyone has to deal with (bottlenecks for storage, network, memory and CPU) rather than anything Drupal-specific.

As promised, last night's slides: Performance, Scalability on the Server Side (PDF, 1MB).

Topic: 
Drupal
FreeBSD
PHP
CentOS5

Installing APC on RHEL5

Submitted by John on Tue, 2008-08-12 16:13

Here's how to install APC on RHEL5.

# yum install php-pear php-devel httpd-devel
# pecl install apc
# echo "extension=apc.so" > /etc/php.d/apc.ini
# service httpd restart

Check for the apc section in your phpinfo() page. If it's not there:

# tail /var/log/httpd/error_log
[Tue Aug 12 15:43:59 2008] [notice] Digest: done
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php/modules/apc.so' - /usr/lib/php/modules/apc.so: cannot open shared object file: Permission denied in Unknown on line 0

SELinux is preventing the extension from loading, I'll bet. Let's check:

# tail /var/log/messages
Aug 12 15:42:40 mybox yum: Installed: httpd-devel - 2.2.3-11.el5_1.3.i386
Aug 12 15:44:01 mybox setroubleshoot: SELinux is preventing the httpd from using potentially mislabeled files (./apc.so). For complete SELinux messages. run sealert -l 9e4bbfa8-327b-4bb2-94df-f154045a1ef1

Let's view the security contexts for our PHP extensions:

# ls -Z /usr/lib/php/modules
-rwxr-xr-x  root root root:object_r:tmp_t              apc.so
-rwxr-xr-x  root root system_u:object_r:textrel_shlib_t dbase.so
-rwxr-xr-x  root root system_u:object_r:textrel_shlib_t gd.so
...

Yup. Notice how the security context is missing (it's tmp_t for apc.so). Let's fix that.

# restorecon /usr/lib/php/modules/apc.so
]# ls -Z /usr/lib/php/modules
-rwxr-xr-x  root root system_u:object_r:textrel_shlib_t apc.so
-rwxr-xr-x  root root system_u:object_r:textrel_shlib_t dbase.so
-rwxr-xr-x  root root system_u:object_r:textrel_shlib_t gd.so
...

Now let's try again:

# service httpd restart

Yay!

P.S. On x86_64, apc.so is in /usr/lib64/php/modules.

Topic: 
PHP
CentOS5
RHEL5

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