Valeriy Bratkevich vbratkev

Find the original here article here: Devops Best Practices

DevOps started out as "Agile Systems Administration". In 2008, at the Agile Conference in Toronto, Andrew Shafer posted an offer to moderate an ad hoc "Birds of a Feather" meeting to discuss the topic of "Agile Infrastructure". Only one person showed up to discuss the topic: Patrick Debois. Their discussions and sharing of ideas with others advanced the concept of "agile systems administration". Debois and Shafer formed an Agile Systems Administrator group on Google, with limited success. Patrick Debois did a presentation called "Infrastructure and Operations" addressing

Normally, when you diff an [Ansible vault][], all you see is gibberish.

$ git diff -- group_vars/all/vault.yml
diff --git a/group_vars/all/vault.yml b/group_vars/all/vault.yml
index 245ccf4..90bf9ee 100644
--- a/group_vars/all/vault.yml
+++ b/group_vars/all/vault.yml
@@ -1,111 +1,111 @@
 $ANSIBLE_VAULT;1.1;AES256

Linux NetFilter, IP Tables and Conntrack Diagrams

IPTABLES TABLES and CHAINS

IPTables has the following 4 built-in tables.

1) Filter Table

Filter is default table for iptables. So, if you don’t define you own table, you’ll be using filter table. Iptables’s filter table has the following built-in chains.

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.

People

`:bowtie:`	😄 `:smile:`	😆 `:laughing:`
😊 `:blush:`	😃 `:smiley:`	☺️ `:relaxed:`
😏 `:smirk:`	😍 `:heart_eyes:`	😘 `:kissing_heart:`
😚 `:kissing_closed_eyes:`	😳 `:flushed:`	😌 `:relieved:`
😆 `:satisfied:`	😁 `:grin:`	😉 `:wink:`
😜 `:stuck_out_tongue_winking_eye:`	😝 `:stuck_out_tongue_closed_eyes:`	😀 `:grinning:`
😗 `:kissing:`	😙 `:kissing_smiling_eyes:`	😛 `:stuck_out_tongue:`

	--- PSQL queries which also duplicated from https://github.com/anvk/AwesomePSQLList/blob/master/README.md
	--- some of them taken from https://www.slideshare.net/alexeylesovsky/deep-dive-into-postgresql-statistics-54594192

	-- I'm not an expert in PSQL. Just a developer who is trying to accumulate useful stat queries which could potentially explain problems in your Postgres DB.

	------------
	-- Basics --
	------------

	-- Get indexes of tables

	#!/bin/bash

	name=$RANDOM
	url='http://localhost:9093/api/v1/alerts'

	echo "firing up alert $name"

	# change url o
	curl -XPOST $url -d "[{
	\"status\": \"firing\",

	client
	dev tun
	remote example.com
	resolv-retry infinite
	nobind
	persist-key
	persist-tun
	ca [inline]
	cert [inline]
	key [inline]

	# alias to edit commit messages without using rebase interactive
	# example: git reword commithash message
	reword = "!f() {\n GIT_SEQUENCE_EDITOR=\"sed -i 1s/^pick/reword/\" GIT_EDITOR=\"printf \\\"%s\\n\\\" \\\"$2\\\" >\" git rebase -i \"$1^\";\n git push -f;\n}; f"

	# aliases to change a git repo from private to public, and public to private using gh-cli
	alias gitpublic="gh repo edit --accept-visibility-change-consequences --visibility public"
	alias gitprivate="gh repo edit --accept-visibility-change-consequences --visibility private"

	# delete all your repos using gh-cli (please do not run this unless you want to delete all your repos)
	gh repo list --limit 300 --json url -q '.[].url' \| xargs -n1 gh repo delete --yes

	*.img
	*.raw