Linux

Some devices will favour IPv6 when configured, which is great, however there are sometimes that you want a device to only resolve either the v4 or v6 addresses.

It’s sometimes useful to be able to match ports on a system to those on a switch from both sides.

What is Openhab?

Frequently in my line of work I’ll be asked about filtering of outbound traffic from application servers.

SSL Certificates are a source of huge amounts of confusion.

With some customers solutions I’ve seen a common requirement to do loadbalancing decision based on the actual application server serving the content, this obviosuly introduces a few issues if you’re using a single base URL for this

Using inotify and the ‘swift’ client tools it is possible to automatically upload files to cloudfiles as they are written to disk.

After starting to use the Yubikey for LastPass and various other online servers I’ve started also using my yubikey for SSH access to my server(s).

As the need for Two factor authentication is a requirement for PCI-DSS (Payment Card Industry standard) and SSH Key with password is not always deemed to be an acceptable form of Two factor authorisation there is now a surge in different forms of two factor auth, all with their own pros and cons.

A common requirement for PCI-DSS is for all commands run by a user who has admin privileges to be logged.