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@stephenhardy
stephenhardy / git-clearHistory
Created April 26, 2013 22:14
Steps to clear out the history of a git/github repository
-- Remove the history from
rm -rf .git
-- recreate the repos from the current content only
git init
git add .
git commit -m "Initial commit"
-- push to the github remote repos ensuring you overwrite history
git remote add origin git@github.com:<YOUR ACCOUNT>/<YOUR REPOS>.git
@npearce
npearce / install-docker.md
Last active May 9, 2024 18:42
Amazon Linux 2 - install docker & docker-compose using 'sudo amazon-linux-extras' command

UPDATE (March 2020, thanks @ic): I don't know the exact AMI version but yum install docker now works on the latest Amazon Linux 2. The instructions below may still be relevant depending on the vintage AMI you are using.

Amazon changed the install in Linux 2. One no-longer using 'yum' See: https://aws.amazon.com/amazon-linux-2/release-notes/

Docker CE Install

sudo amazon-linux-extras install docker
sudo service docker start
@denji
denji / http-benchmark.md
Last active May 9, 2024 13:04
HTTP(S) Benchmark Tools / Toolkit for testing/debugging HTTP(S) and restAPI (RESTful)

Requirements

There are 18 questions in total. You will need five RHEL 8 (or CentOS 😎 virtual machines to be able to successfully complete all questions.

Optional Automatic Exam Setup Available

Here is an automated exam environment deployment for Mac/Linux/Windows that deploys the practice exam environment for you, including IPA server/client installation and configuration. You can also use your own lab environment. Navigate to the respective repo you wish to use for this practice exam and follow the README instructions:

https://github.com/rdbreak/rhce8env, https://github.com/rdbreak/ansible27env, https://github.com/rdbreak/ansible8env.

@pirate
pirate / docker-compose-backup.sh
Last active May 3, 2024 13:42
Backup a docker-compose project, including all images, named and unnamed volumes, container filesystems, config, logs, and databases.
#!/usr/bin/env bash
### Bash Environment Setup
# http://redsymbol.net/articles/unofficial-bash-strict-mode/
# https://www.gnu.org/software/bash/manual/html_node/The-Set-Builtin.html
# set -o xtrace
set -o errexit
set -o errtrace
set -o nounset
set -o pipefail
@denji
denji / nginx-tuning.md
Last active May 3, 2024 03:57
NGINX tuning for best performance

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.

@reachlin
reachlin / prometheus.yml
Created April 19, 2017 07:06
sample prometheus configuration explained
// For all the confusing Prometheus configuration and
// regular expressions,
// explained in examples.
// Remember, there are default values for each item if it's missing.
// regex is (.*),
// replacement is $1,
// separator is ;
// ,and action is replace
@ck-on
ck-on / ocp.php
Last active March 25, 2024 09:30
OCP - Opcache Control Panel (aka Zend Optimizer+ Control Panel for PHP)#ocp #php #opcache #opcode #cache #zend #optimizerplus #optimizer+
<?php
/*
OCP - Opcache Control Panel (aka Zend Optimizer+ Control Panel for PHP)
Author: _ck_ (with contributions by GK, stasilok)
Version: 0.1.7
Free for any kind of use or modification, I am not responsible for anything, please share your improvements
* revision history
0.1.7 2015-09-01 regex fix for PHP7 phpinfo
0.1.6 2013-04-12 moved meta to footer so graphs can be higher and reduce clutter
@sergeyklay
sergeyklay / journalctl-cheatsheet.md
Last active March 20, 2024 21:45
Journalctl Cheat Sheet

Journalctl Cheat Sheet

Configuration

Permissions

To see messages from other users and the system as well as performing various log operations from a regular user add it to the group:

sudo usermod -aG systemd-journal $USER
@baojie
baojie / hello_multiprocessing.py
Created July 21, 2013 07:04
Python multiprocessing hello world. Split a list and process sublists in different jobs
import multiprocessing
# split a list into evenly sized chunks
def chunks(l, n):
return [l[i:i+n] for i in range(0, len(l), n)]
def do_job(job_id, data_slice):
for item in data_slice:
print "job", job_id, item