How To Block All Traffic From China Using iptables and ipset on Amazon Linux

Author: , October 24th, 2019

All credit to Matt Wilcox for this excellent article, for which this post is based – thank you, Matt! https://mattwilcox.net/web-development/unexpected-ddos-blocking-china-with-ipset-and-iptables/ All commands run as root!

Do this once only:

Then add blockchina to the root cron

How To Sync Box to S3 Using rclone

Author: , October 3rd, 2019

To sync various cloud resources, use the excellent cli tool rclone from https://rclone.org/docs/ For this use case, the need was to sync from Box to an AWS S3 bucket. Install rclone:

Configure both S3 and Box – for remote name labels I just used “S3” and “Box”:

Validate Access and Functionality:

Perform […]

10 Reasons Why Tungsten Clustering Beats the DIY Approach for Geo-Distributed MySQL Deployments

Author: , August 29th, 2019

Why does the DIY approach fail to deliver vs. the Tungsten Clustering solution for geo-distributed MySQL multimaster deployments? Before we dive into the 10 reasons, note why commercially-supported enterprise software is less risky and in fact less costly.

How To Upgrade PHP on AWS Linux

Author: , August 22nd, 2019

As root:

~or~

THEN:

Be sure to restart your web server!!

How To List Running AWS Instances in all Regions Sorted by LaunchTime and Email in a Monospaced Font

Author: , July 1st, 2019

How To Obtain a Public Key from an AWS .pem Private Key on Linux and Mac

Author: , February 4th, 2019

Use the ssh-keygen command on a computer to which you’ve downloaded your private key .pem file; for example: First, ensure permissions will allow ssh-keygen to work: chmod 600 /path/to/the/file/your-key-pair.pem Then generate an RSA public key: ssh-keygen -y -f /path/to/the/file/your-key-pair.pem > your-key-pair.pub

How To Locate Attached Disk Devices in Linux

Author: , April 24th, 2018

https://linux.die.net/man/8/lsblk # lsblk -a

How To Upgrade MySQL from 5.5 to 5.7 on CentOS/AWS Linux

Author: , December 7th, 2017

START: Server version: 5.5.54-log MySQL Community Server (GPL) FINISH: Server version: 5.7.20-log MySQL Community Server (GPL)

How To Block an Entire TLD in Postfix

Author: , September 13th, 2016

Step 1. Execute the following two commands: postconf -e smtpd_sender_restrictions=pcre:/etc/postfix/rejected_domains postconf -e reject_unauth_destinations=pcre:/etc/postfix/rejected_domains If that doesn’t work, you may hand-edit main.cf and add/edit these lines:

Step 2. Create the regex filter file: vim /etc/postfix/rejected_domains

Step 3. Signal Postfix to reread the config: postfix reload NOTE: Do NOT use the postmap command for the […]

How To Install and Use the screen Command on AWS Linux

Author: , August 12th, 2016

Install it: yum install screen Start it up: screen Detach from the session: Control-a d Re-attach to the session later on: screen -r This is a good reference guide: https://www.rackaid.com/blog/linux-screen-tutorial-and-how-to/