The APC(Alternative PHP Cache) can be installed using PECL on linux cpanel server 1) Just execute following command from shell as root user pecl install apc and select the options as per the requirement. 2) Update global php.ini with the apc extension extension=â€apc.so†3) Restart apache service Steps to install APC on Linux server manually using tarball 1) Login to the server as root from shell and go to #cd /usr/local/src 2) Go to https://pecl.php.net/package/APC and copy the download link #wget https://pecl.php.net/get/APC-3.1.19.tgz 3) Extract the archive #tar -xzf APC-3.1.19.tgz cd APC-3.1.19 phpize ./configure –enable-apc –enable-apc-mmap –with-apxs –with-php-config=/usr/local/bin/php-config make make install 4) Check the PHP file location by # php -i | grep php.ini 5) Add the extension in php.ini extension=â€apc.so†6) Restart Apache 7) Check the PHP modules Note: If the OS is Centos 5.5 then install pcre module if not present # yum install pcre-devel