Amazon EC2: components interaction

amazon_web_services_ec2

After first weeks with AWS you’re starting to understand what is the main Amazon service. And, of course, it’s Elastic Compute Cloud (shortly EC2). EC2 instances – virtual machines running on demand. It’s necessary to know how services connect to instances and interact with each other.

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Cheatsheet: Linux system variables

Many people think that the problem of application performance, security and networking lies in supported services. Like Nginx is proxying too slow or remote DBMS cannot see my network. Frequently the problem in OS. Default values of system settings can restrict our environment to make the service jobs quick and simple. The best way to change your system configuration – change the system variables.

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Cheatsheet: iptables

iptables is Linux firewall standard. You can easily open and close network connections through it. Actually it’s pretty easy, but sometimes we can’t remember any flags and commands to create firewall rules. Here is a cheatsheet table constituted by all necessary iptables rules for novices. I’ll try to update it once in a while.

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