Tag Archives: SysAdmin

SysAdmin Assistance for customers with 2 or more VPS

Posted on June 30, 2015 by richard

During July and August 2015 we’re offering customers with 2 or more VPS “a few hours” of our SysAdmin time and effort, available to do what you’d like on your Network Presence VPS. This is equivalent to a free “SysAdmin … Continue reading →

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Bashism: Convert the case of a variable

Posted on June 24, 2015 by richard

Following on with more Bash version 4 Shell coding notes, here’s a way (as always with Bash, there’s so many ways to do anything) to ensure a variable is all lowercase characters (or all uppercase): a=Hello echo ${a,,} hello You … Continue reading →

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Use sed to delete lines between text phrases

Posted on June 19, 2015 by richard

How to remove lines from stdin between and including the 2 lines as fields in a sed expression: sed “/textline1/,/textline2/d” This will delete from the input all lines between a line containing the text ‘textline1’ and ‘textline2’. If you have … Continue reading →

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Varnish tools & command-lines for performance checks

Posted on April 20, 2015 by richard

Varnish is a popular Web Load Balancer and here’s some commands that are useful to help diagnose your website’s performance, and give some stats and metrics about the response time and activity of your website as Varnish sees it: // … Continue reading →

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Info on using IPv6 at Network Presence

Posted on January 17, 2015 by richard

We’ve provided IPv6 connectivity for our VPS and Colo customers for many years (5+) now and here’s some information on how to use and configure your IPv6 connectivity on your VPS at Network Presence. Firstly, our network does auto-assignment of … Continue reading →

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Need help with AWS/EC2 Cloud use?

Posted on December 19, 2014 by richard

Though we run competing infrastructure and services ourselves, we know that some customers and businesses must (for various valid reasons) run their Servers or Cloud in Amazon Web Service (AWS or EC2) for their VPS requirements. That said, AWS can … Continue reading →

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How to install PHP 5.4 on CentOS 6

Posted on December 11, 2014 by richard

First to get PHP 5.4 on CentOS 6 you need to install and enable the EPEL and Remi 3rd party Software Repositories with these commands as root from a shell: wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm rpm -Uvh remi-release-6*.rpm epel-release-6*.rpm Then run … Continue reading →

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Using GECOS & PAM for custom umask settings, incl via Chroot SFTP

Posted on October 14, 2014 by richard

The PAM module “pam_umask” (installed by default in latest Debian Linux) is very useful for setting user-by-user umask permissions that even work in the constrained/restrictive (for settings) “SFTP Chroot” environment. The chroot environment of SFTP as provided by SSH is … Continue reading →

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We’ve updated our Varnish Appliance VPS for Varnis…

Posted on September 19, 2014 by richard

We’ve updated our Varnish Appliance VPS for Varnish 4 on latest CentOS 6. Fully managed Varnish Web Cache/Proxy VPS. networkpresence.com.au/hosting/applia…

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Quick Android VPN Client Setup How To

Posted on September 5, 2014 by richard

This quickly describes how to setup the Android L2TP/IPSec VPN client. On your Android screen, go to: Settings -> Wireless & Networks -> VPN Settings Select Add VPN – > Add L2TP/IPSec PSK VPN In the Add VPN Settings, enter: … Continue reading →

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