mraspor

The Proxmox Corosync fallacy

TL;DR Distinguish the role of Corosync in Proxmox clusters from the rest of the stack and appreciate the actual reasons behind unexpected reboots or failed quorums.

ORIGINAL POST The Proxmox Corosync fallacy

A curated list of AWS resources to prepare for the AWS Certifications

A curated list of awesome AWS resources you need to prepare for the all 5 AWS Certifications. This gist will include: open source repos, blogs & blogposts, ebooks, PDF, whitepapers, video courses, free lecture, slides, sample test and many other resources.

Project Title

One Paragraph of project description goes here

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

Prerequisites

SSH forward local port to remote AWS RDS instance

The scenario:

We have connectivity to remote server (EC2 instance) REMOTE_EC2_HOST over SSH.
Connectivity to AWS RDS MySQL instance RDS.ENDPOINT.rds.amazonaws.com from remote server only (due to security group/firewall settings).

# forward requests from 127.0.0.1:6400 -> RDS.ENDPOINT.rds.amazonaws.com:3306
# add [-f] switch to background ssh process
$ ssh -vvvN \
	-L 6400:RDS.ENDPOINT.rds.amazonaws.com:3306 \

Moved to git repository: https://github.com/denji/nginx-tuning

NGINX Tuning For Best Performance

For this configuration you can use web server you like, i decided, because i work mostly with it to use nginx.

Generally, properly configured nginx can handle up to 400K to 500K requests per second (clustered), most what i saw is 50K to 80K (non-clustered) requests per second and 30% CPU load, course, this was 2 x Intel Xeon with HyperThreading enabled, but it can work without problem on slower machines.

You must understand that this config is used in testing environment and not in production so you will need to find a way to implement most of those features best possible for your servers.

	#!/bin/bash
	# This script backs up files using restic and sends emails on success or errors.
	#
	# Files that the script expects:
	# /usr/local/etc/restic/repo.env: shell variables that define the restic repository
	# /usr/local/etc/restic/include.txt: paths to back up
	# /usr/local/etc/restic/exclude.txt: paths to not include in the backup, even if they are in include.txt
	#
	# Inspired by https://gist.github.com/perfecto25/18abbd6cfbaa4e9eb30251470e9b7504

	#!/bin/bash

	mkdir -p /mnt/nextcloud-bucket/{s3backer,filesystem}

	s3backer \
	--listBlocks \
	\
	--blockSize=1M \
	--size=500G \
	\

	http://pl.atyp.us/wordpress/index.php/2009/09/file-transfer-fun/

	File Transfer Fun
	17 September, 2009 8:32 am
	I’ve written before about the extreme usefulness of sshfs for accessing files remotely without having to install server software. It continues to be an important part of my toolbox, as does its cousin CurlFtpFS which – unlike sshfs – I can even use to mount a directory here on my web host. Of course, either becomes even more useful when combined with some easy method of synchronization. You probably have rsync already. You can also use Unison if you need bidirectional synchronization – which you generally will if you’re trying to use a single directory somewhere as a “drop box” to share between multiple machines.

	I just found another sshfs trick today. If the connection between your two machines is already secure – e.g. on the same private network or connected via a secure VPN/tunnel – you might want to avoid an extra round of encryption and decryption by using the “-o directport” option to sshfs. T

	# Author: Zameer Ansari
	# You should look at the following URL's in order to grasp a solid understanding
	# of Nginx configuration files in order to fully unleash the power of Nginx.
	# http://wiki.nginx.org/Pitfalls
	# http://wiki.nginx.org/QuickStart
	# http://wiki.nginx.org/Configuration
	#
	# Generally, you will want to move this file somewhere, and start with a clean
	# file but keep this around for reference. Or just disable in sites-enabled.
	#