Tag Archives: SysAdmin

Use sed to delete lines between text phrases

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

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

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?

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

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

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…

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

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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Installing & configuring Cacti for 1 Minute 64bit Graphing

The “Interface – Traffic (bit/sec…)” Cacti Graph Templates need to be edited to set this “Upper Limit” value (confirmed that ‘0’ works fine here) and save that change, for each of the bit/sec Traffic Graph Templates you use (“Interface – … Continue reading

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Helping customers wrt DNS Amplification DDOS Attacks

There’s been a new wave of these Name Server exploits to cause global “DNS Amplification” DDOS Attacks and some customers are asking for information and help in stopping their Name Servers being utilised for this undesirable network activity. We’re available … Continue reading

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