How to fix error can’t ping any hostname on Linux
How to fix error can’t ping any hostname on Linux? But you can ping IP. So strange! How to fix this error? Simple, you only…
Month: December 2018
Understanding ps aux output in Linux
When use command ps aux we get this output: What does each column of the output mean? USER = user owning the process PID =…
How to fix error can’t ping AWS EC2 instance IP
Open inbound traffic for AWS EC2 instance Step 1: open EC2 dashboard -> Instances Click current security group to edit Step 2: Click Inbound then…
How to use AWS EC2 Linux with Putty and Bitvise Tunnelier
After create instance you have a pem key like vps1.pem and some information like: Public DNS (IPv4) ec2-54-169-145-222.ap-southeast-1.compute.amazonaws.com Convert your private key Step 1: open…
The Open Graph protocol for video
Introduction The Open Graph protocol enables any web page to become a rich object in a social graph. For instance, this is used on Facebook…
How to flush DNS cache on CentOS
Flush caching BIND server DNS cache A caching BIND server obtains information from another server (a Zone Master) in response to a host query and…
Clear RAM cache and swap space on Linux
Clear RAM Cache on Linux 1. Clear PageCache only. 2. Clear dentries and inodes. 3. Clear PageCache, dentries and inodes. Clear swap space on Linux…
GIT: how to clone a specific branch
You can use this command: or Example 1: Example 2:
How to use memcached with replication on CentOS
Repcached is memcached which implemented multi master asynchronous replication feature. Download source code. Repcached key features Multi master replication. Asynchronous data repliacation. Support all memcached…
How to install telnet client on Windows Server 2008
Step 1: go to Start->Control Panel Step 2: choose Programs and Features Step 3: click Turn Windows features on or off Step 4: click Features->Add…