WordPress MultiSite Admin Slow

After upgrading from 3 -> 4 the admin panel became utterly unusable. 20-30 seconds on any action.

Found - https://wordpress.org/support/topic/admin-back-end-slowfront-end-good#8

And for me :

Manually run /wp-admin/upgrade.php

UPDATE 25/1/2015 - Also had to do this for 4.0 -> 4.1 Upgrade

RaspberryPI / Motion & Multiple USB Cameras

Playing around with Motion on Raspian.  Motion was simple to setup with a single camera but when I added a second and switched to the thread config files I started to get :

Unable to query input 1 VIDIOC_ENUMINPUT: Invalid argument

Tracked it to a setting in the default thread2.conf

# The video input to be used (default: 8)
# Should normally be set to 1 for video/TV cards, and 8 for USB cameras
input 1

Change the input to 8 and all is well

CentOS 7 Missing ifconfig command

CentOS 7 no longer ships with the command/s.  You can install via yum

sudo yum install net-tools