Byobu is similar to Screen. It is popular in Ubuntu, to install Byobu on CentOS, we need to compile it from source. Download Byobu from: https://launchpad.net/byobu/+download
Untar the file
Go to the byobu directory and install from source:
To use byobu, type
Press F9 to show help menu:
Highlight: Ubuntu + Nginx + PHP-FPM + Varnish for WordPress site
The current site is hosted on CentOS 6 using Apache in home lab server, so you may experience slowness due to network limitation. When I was using Apache Bench tool to test the site performance, it can only server 10 requests per second. I’ve tried using Memcache and APC, the performance gain is minimum. After use Varnish in front of Apache server, the site can server over 10,000 requests per second. Here, I am going to setup another test server using Nginx + Varnish to compare with current setup. With Nginx only, it can serve 60 requests per second. That’s 6 times faster than Apache without any cache program. Now, let’s see how much performance Nginx can gain by using Varnish compare to Apache.
Rackspace recently released Private Cloud software which you can obtain from http://www.rackspace.com/cloud/private/openstack_software/. Just fill in your contact info, then you will receive a download link in your email.
For evaluation purposes, I installed both Controller and Computer nodes to one VM on my ESXi homelab. Rackspace has an article showing how to install the software
The instruction is clear, but I run into an error after boot the VM. It keeps telling me that the hardware virtualization is not enabled. This is because by default ESXi automatically detect software/hardware Virtualization. You can fix this by:
Edit VM Settings >> Options >> Advanced >> CPU/MMU Virtualization >> Chose “Use Intel VT-x/AMD-V for ….”. Also, make sure on Options tab, change the Guest Operating System to Other – VMWare ESXi 5.x as I couldn’t find this when I use automatic for CPU Virtualization. Reboot the VM, you will be able to install the software.
Source – Rachael King
Companies are turning increasingly to IT outsourcing as a means of supplementing and, in some cases, replacing internal hires. That’s especially true of application hosting. About 35% of companies say they’ll outsource more in this area during the next year to 18 months, according to a new report from global consulting firm Bluewolf. Cloud computing is partially driving this growth, as more companies use applications from the likes of Salesforce, Google and Workday.
Companies spend nearly half of their outsourcing budgets on application services including development, hosting and maintenance. Bluewolf predicts that as more companies rely on cloud providers, the outsourcing of applications will grow, whether it’s to providers who offer niche services or larger companies like Google or Microsoft.
W3 Total Cache support many page cache methods. For VPS or Dedicated server, it’s better to use Opcode than disk. The Alternative PHP Cache will be built into PHP6, so it’s a good to try it now.
“APC is a free, open, and robust framework for caching and optimizing PHP intermediate code.”
On CentOS, you can install it though:
# pecl install apc
Or manually install it
# wget http://pecl.php.net/get/APC-3.1.6.tgz
# tar -xvzf APC-*.tgz
# cd APC-*
# make install
I’ve see the following error when to install APC through pecl. To solve the problem, just install pcre-devel package first
# yum install pcre-devel
/root/tmp/pear/APC/apc.c:369: error: expected specifier-qualifier-list before 'pcre' /root/tmp/pear/APC/apc.c: In function 'apc_regex_compile_array': /root/tmp/pear/APC/apc.c:430: error: 'apc_regex' has no member named 'preg' /root/tmp/pear/APC/apc.c:430: error: 'apc_regex' has no member named 'preg' /root/tmp/pear/APC/apc.c:431: error: 'apc_regex' has no member named 'nreg' /root/tmp/pear/APC/apc.c:431: error: 'apc_regex' has no member named 'nreg' /root/tmp/pear/APC/apc.c: In function 'apc_regex_match_array':
mod_pagespeed is an open-source Apache module that automatically optimizes web pages and resources on them. It does this by rewriting the resources using filters that implement web performance best practices. Webmasters and web developers can use mod_pagespeed to improve the performance of their web pages when serving content with the Apache HTTP Server.
First, check which Linux distribution you are using by this command:
cloudtech ~: uname -aLinux cloudtech 18.104.22.168-x86_64-linode10 #1 SMP Tue Nov 10 16:29:17 UTC 2009 x86_64 x86_64 x86_64 GNU/Linux
Second, download the package at this link: mod_pagespeed latest version
Here I am using 64 bits CentOS Linux system, so i ‘ve downloaded mod_pagespeed 64-bit .rpm (CentOS/Fedora)
Third, install the package
rpm -i mod-pagespeed-*.rpm
or follow the instruction in official site. If you cannot install it, try this:
Install and import Google key into RPM, then you can install mod_pagespeed package using yum localinstall command:
wget https://dl-ssl.google.com/linux/linux_signing_key.pub rpm --import linux_signing_key.pub
yum localinstall mod-pagespeed-*.rpm
Check which files you just installed:
cloudtech ~: rpm -ql mod-pagespeed-beta /etc/cron.daily/mod-pagespeed /etc/httpd/conf.d/pagespeed.conf /usr/lib64/httpd/modules/mod_pagespeed.so /var/www/mod_pagespeed/cache /var/www/mod_pagespeed/files
Last, restart Apache to load the new module
cloudtech ~: service httpd restart
Download the latest versionyum localinstall mod-pagespeed-*.rpm to install
Visit your site without mod_pagespeed
Visit your site with mod_pagespeed
Without mod_pagespeed, my site score is 73/100.
With mod_pagespeed, my site score is 81/100.
You can also test your site at ModPageSpeed.com