To install OpenCV use Jay Rambhia’s install script. And to install SimpleCV, follow the directions on the SimpleCV GitHub page.

Start a new session with:

tmux new

Detach your session with:

tmux detach

Reattach your session after detaching or having your SSH session die:

tmux attach -d

Read more on Josh Clayton’s blog.

If you run into a problem with the lock screen rejecting your password then you can fix it with it:

sudo chown root:shadow /sbin/unix_chkpwd
sudo chmod 2755 /sbin/unix_chkpwd
sudo chown root:shadow /etc/shadow
sudo chmod g+r /etc/shadow

bash -s stable < <(curl -s https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer )

To configure the VPN connection, from the network manager icon in the top right corner click: “VPN Connections” > “Configure VPN…”. Use a PPTP VPN, enter the gateway, set the username and password, and then under “Advanced…” check “Use Point-to-Point encryption (MPPE)”

If you’re running under VirtualBox then you’ll need to update the “Network” tab to use the attached to “Bridged Adapter” setting instead of the default “NAT”.

You’ll first need to put the ISO in your lockbox, which you can find details for from the hardware page for your instance:

benmccann@mongo2:~$ wget http://releases.ubuntu.com/12.04/ubuntu-12.04.1-server-amd64.iso
benmccann@mongo2:~$ ftp lockbox01.service.softlayer.com
Name (lockbox501.service.softlayer.com:benmccann): SLLBXXXXXX-X
331 Password required for SLLBXXXXXX-X
Password:
230 User SLLBXXXXXX-X logged in
ftp> put ubuntu-12.04.1-server-amd64.iso

Next you’ll need to mount the image on your instance. Go to the hardware page for the instance you’re using and click the “IPMI address” link. Connect to the PPTP VPN and then paste the “Remote Mgmt IP” in the URL bar of your browser and enter the accompanying username and password. Go to “Virtual Media” > “CD-ROM Image”. Ping your lockbox to get its IP address since the DNS name will not work here.

$ ping lockbox01.service.softlayer.com
PING lockbox01.service.softlayer.com (10.1.194.50) 56(84) bytes of data.

Enter the details making sure to use the IP address instead of hostname and to include the lockbox username in your path:

Share host: 10.1.194.50
Path to image: \SLLBXXXXXX-X\ubuntu-12.04.1-server-amd64.iso
User: SLLBXXXXXX-X
Password: ********

At this point you’ll need to file a ticket with SoftLayer to change the boot order of your machine to boot off the CD instead of the hard drive. You should probably go ahead and try the next step, but then just be aware if the machine boots up without giving you the option to install the new OS then the support ticket will be required.

From the page where you got the IP address, username, and password for the IPMI web console, you can get instructions for downloading IPMIView and connecting to your instance. Do “File” > “New…” > “System” and after you connect click on the “KVM Console” tab then “Launch KVM Console”. Now click to the “IPM Device” tab and reset the machine. At this point you should see your machine in the KVM window and you can install your OS.

{
	"_id" : 4,
	"name" : "55.55.55.55:27017",
	"health" : 1,
	"state" : 3,
	"stateStr" : "RECOVERING",
	"uptime" : 502511,
	"optime" : {
		"t" : 1340841938000,
		"i" : 5028
	},
	"optimeDate" : ISODate("2012-06-28T00:05:38Z"),
	"lastHeartbeat" : ISODate("2012-08-22T22:47:00Z"),
	"pingMs" : 0,
	"errmsg" : "error RS102 too stale to catch up"
},

The MongoDB wiki has some instructions on resyncing a very stale replica. I chose to go the simplest route of doing a full resync. To do this I had to figure out where the data was stored, so I looked in /etc/mongodb.conf to see that the dbpath was set to /var/lib/mongodb. Stopping the node, deleting the data directory, and then restarting the node solved the problem. You’ll need the key file (if you’re using auth) and the data directory to both exist with the proper ownership and permissions to bring the node back up.

• Open regedit
• Navigate to: HKEY_CURRENT_USER\Software\Google\Google Talk Plugin
• Change the audio-flags value data to 1

The audio-flags registry key is not there on a clean install of Windows, but will show up once you change the Google video chat settings in GMail.  Note that if you ever change the video chat settings in GMail then it will override the registry settings and you will need to set this flag again.

You can then restore the backup with:

$ xtrabackup --prepare --datadir=/var/lib/mysql --target-dir=/path/to/BACKUP-DIR/
$ sudo service mysql stop
$ sudo mv /var/lib/mysql ~/dbbackup
$ sudo mv /path/to/BACKUP-DIR /var/lib/mysql
$ sudo chown -R mysql:mysql /var/lib/mysql
$ sudo service mysql start
$ mysql -u root -p
mysql> GRANT ALL PRIVILEGES ON *.* TO 'debian-sys-maint'@'localhost' IDENTIFIED BY 'password from /etc/mysql/debian.cnf' WITH GRANT OPTION;