Life, The Universe and ... Everything!

Google Maps allows you to view satellite imagery at various resolutions via a web-based interactive display. The maps are transferred as partial tiles, making access quick as it only downloads the parts you need as you to pan and zoom. You can take a snapshot of the screen using your operating system's Print Screen feature, but what if you wanted a high-resolution image that covered an area larger than your screen? And what if you needed the image to be geo-referenced? Google Satellite Ma...

Setting Up a Reverse FTP Proxy Server Problem: You have a server (let's call it the firewall) with a public IP. Users will connect to this public IP using FTP clients. However your actual FTP server is not located on the firewall, but located somewhere else -- behind a DMZ, or through a VPN, or just another "less visible" public IP on the internet. You need the Firewall to act as a reverse-proxy and relay the protocol from your firewall to your actual ftp server. Doing this at the network ...

In ubuntu:sudo dd if=/dev/sr0 of=output.iso

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Situation: I had originally created one of my QEMU/KVM Virtual Machines with a qcow2 format disk image of 25GB. I realised I needed more space on my /data partition. mount: /dev/mapper/vg_icky-lv_data on /data type ext4 (rw) lvscan: ACTIVE '/dev/vg_icky/lv_data' [12.54 GiB] inherit pvscan: PV /dev/vda2 VG vg_icky lvm2 [24.51 GiB / 0 free] The VM's disk resides on the host at: /raiddata/VMRAID/icky.img This is what I did:stop the virtual machine.On the host, execute the following: qemu-im...

MySQL Here are my notes for MySQL on CentOS 5.Install MySQLInstall mysql:sudo apt-get install mysql-server (Ubuntu)yum install mysql mysql-server (CentOS)For cluster systems:Move mysql data folder to shared storage:mv /var/lib/mysql /data/mysqlln -s /data/mysql /var/libFor non-clustered system, start mySQL on boot:chkconfig --level 345 mysqld onStart mysql service. Note that on ubuntu, the service name is "mysql" but on CentOS it is "mysqld":service mysqld startSet initial root passwordRun sc...

Almost everyone around me has a Samsung phone and I got tired of needlessly checking my phone each time someone else received a call or message. I found that someone had put up the MIDI ringtones from the Treo 600 and 650 series of yesteryear, so I decided to Go Retro! You can find download the MIDI files from here: http://forums.crackberry.com/blackberry-ringtones-f15/palm-treo-ringtone-216856/. MIDI files don't record the actual sound played, rather they store the notes played and what i...

Initial PostgreSQL Setup (Ubuntu 12.04)I change the access control porton of the /etc/postgresql/9.1/main/pg_hba.conf to the following:# Database administrative login by Unix domain socket local all postgres peer # TYPE DATABASE USER ADDRESS METHOD # "local" is for Unix domain socket connections only #local all all peer # IPv4 local connections: #host all ...