It is possible to use CloudWatch to monitor your disk and memory usage. There are very good information on AWS – http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/mon-scripts-perl.html For the impatient, here is how to get it done.
Category: others
Backup to USB drive and power it off when not in use
On Linux, it is possible to power off a USB device using command line. It’s perfect for my USB backup drive. I can power it off after backup every night, and power it on before the job starts. This saves power, reduce heat, and more importantly, prevent accidental or unexpected changes as the device is completely offline.
Leap second 2015-Jul-1
Redhat has provided a couple of excellent articles describing the upcoming leap second as well as how to handle it. Here, I want to demonstrate the behavior of a server not running NTP.
Adding SystemRescueCD to grub2
Adding a bootable ISO image to grub will be very useful for recovering Linux systems. Here we add the systemrescuecd iso to grub2 on Ubuntu 15.04. It’s really easy and I recommend adding it to every Linux systems!
Oracle Database 12c
Check out my latest wiki post on installing Oracle 12c Release 1 on Linux.
Why not Azure
I recently attended a 4-day training on Microsoft’s cloud platform. Quickly I learned why it should not be used if you’re serious about your business.
Recursive programming
This morning I passed by my secondary school campus. It has changed a lot with 2 brand new buildings. I started to learn programing in that school, where they taught me about palindrome and some very basic programming lessons. I don’t even remember what language was used back then. Probably basic. Then I remember learning about OO…
VULTR: First impression
I’s in search for a cheaper cloud service and VULTR is definitely one of them. My first impression isn’t so great as it took more than 20min to provision a CentOS 7 instance. I’m starting to doubt if the instance will ever come up, or they have really really slow SSD, or their provisioning module…
LXC and CentOS 7
LXC has quickly become my favorate test bed. Starting a CentOS 7 container is however slightly complicated.
Helios 44-2
Bought this from taobao and I’m very happy with the spiral bokeh. This lens is extremely cheap considering its unique feature/flaw. Here, I just want to quickly demonstrate the sharpness of this lens. The edges are obviously softer. Here I take a picture off my computer screen. The characters around edges are blurred badly. Don’t…