phonglh79’s gists

phonglh79 / gist:e1a63db04b421cddb2f1bf7a9759c6ff

Created June 23, 2017 03:39 — forked from bobuss/gist:6515517

Tuning the Linux Kernel for many tcp connections

(from http://www.metabrew.com/article/a-million-user-comet-application-with-mochiweb-part-1)

Save yourself some time and tune the kernel tcp settings before testing with lots of connections, or your test will fail and you’ll see lots of Out of socket memory messages (and if you are masquerading, nf_conntrack: table full, dropping packet.)

Here are the sysctl settings I ended up with - YMMV, but these will probably do:

$ cat /etc/sysctl.conf
# General gigabit tuning:
net.core.rmem_max = 16777216

phonglh79 / Bcache Tutorial

Created September 4, 2017 07:37 — forked from TheAnonymous/Bcache Tutorial

Making a SSD working as a Cache for a HDD with bcache.

	There are 3 Methods for using a SSD as cache.
	dm-cache, bcache,enhance-io all three should be avaliable in Kernel Version 3.10.
	Performance differenceses are discussed here => http://lkml.indiana.edu/hypermail/linux/kernel/1306.1/01246.html
	In this tutorial I will use bcache since dm-cache didn't worked for me.
	At the moment there is only an rc5 candidate for kernel 3.10.0
	How to compile it is explained below. If you have a newer kernel than 3.10 and it is bcache enabled you dont need to compile it by yourself. In this case just jump over the kernel-compile-exlanation. If your kernel is compiled with bcache support you can test with "modprobe bcache". If that doesnt throw an error it should work :)
	I will link to the tutorials I used. If you found better ones please paste a link in the comments

	How to compile a kernel by yourself is explained at:
	=> http://bodhizazen.net/Tutorials/kernel

phonglh79 / cors-nginx.conf

Created September 6, 2017 03:39 — forked from alexjs/cors-nginx.conf

Slightly tighter CORS config for nginx


	#
	# Slightly tighter CORS config for nginx
	#
	# A modification of https://gist.github.com/1064640/ to include a white-list of URLs
	#
	# Despite the W3C guidance suggesting that a list of origins can be passed as part of
	# Access-Control-Allow-Origin headers, several browsers (well, at least Firefox)
	# don't seem to play nicely with this.
	#

phonglh79 / cors-nginx.conf

Created September 6, 2017 03:39 — forked from michiel/cors-nginx.conf

Wide-open CORS config for nginx

	#
	# Wide-open CORS config for nginx
	#
	location / {

	if ($request_method = 'OPTIONS') {

	add_header 'Access-Control-Allow-Origin' '*';

	#

phonglh79 / nginx.conf

Created September 7, 2017 04:46 — forked from plentz/nginx.conf

Best nginx configuration for improved security(and performance). Complete blog post here http://tautt.com/best-nginx-configuration-for-security/

	# to generate your dhparam.pem file, run in the terminal
	openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048

phonglh79 / nginx.conf

Created September 22, 2017 08:13 — forked from kmjones1979/nginx.conf

Example NGINX configuration to route based on country code using GeoIP

	# load dynamic modules
	load_module /etc/nginx/modules/ngx_http_geoip_module.so;

	user nginx;
	worker_processes auto;
	error_log /var/log/nginx/error.log info;
	pid /var/run/nginx.pid;
	events { worker_connections 1024; }

	http {

phonglh79 / Setup GeoIP with NginX & PHP

Created September 22, 2017 08:40 — forked from sureshsaggar/Setup GeoIP with NginX & PHP

Setup GeoIP with NginX & PHP

	On my Ubuntu machine I located the GeoIP.dat file. If not available then download/intall the same.

	root@localhost:~# locate GeoIP.dat
	/usr/share/GeoIP/GeoIP.dat

	Open Nginx configuration (/etc/nginx/nginx.conf) and specify <geoip_country> <path to GeoIP.dat>
	line under the "http" block. Example block:

	http {
	# SS - meant to find country code from the client IP

phonglh79 / gist:1438b5152629c8ee200d8cffb56bb378

Created October 17, 2017 06:56 — forked from dmsimard/gist:2737832d077cfc5eff34

Ceph Benchmarks

The tests

fio full write:

fio --name=writefile --size=100G --filesize=100G --filename=/dev/sdX --bs=1M --nrfiles=1 --direct=1 --sync=0 --randrepeat=0 --rw=write --refill_buffers --end_fsync=1 --iodepth=200 --ioengine=libaio

fio random read:

fio --time_based --name=benchmark --size=100G --runtime=30 --filename=/dev/sdX --ioengine=libaio --randrepeat=0 --iodepth=128 --direct=1 --invalidate=1 --verify=0 --verify_fatal=0 --numjobs=4 --rw=randread --blocksize=4k --group_reporting

phonglh79 / Install ScaleIO Centos 7 barebones

Created December 28, 2017 07:21 — forked from nctiggy/Install ScaleIO Centos 7 barebones

	yum -y update
	yum -y install net-tools
	echo kernel.shmmax=209715200 >> /etc/sysctl.conf
	yum -y install libaio numactl sysfsutils unzip wget
	cd /opt/
	wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u112-b15/jdk-8u112-linux-x64.tar.gz"
	tar xzf jdk-8u112-linux-x64.tar.gz
	cd /opt/jdk1.8.0_112/
	alternatives --install /usr/bin/java java /opt/jdk1.8.0_112/bin/java 2
	alternatives --config java

phonglh79 / mongodb-s3-backup.sh

Created January 11, 2018 03:19 — forked from eladnava/mongodb-s3-backup.sh

Automatically backup a MongoDB database to S3 using mongodump, tar, and awscli (Ubuntu 14.04 LTS)

	#!/bin/sh

	# Make sure to:
	# 1) Name this file `backup.sh` and place it in /home/ubuntu
	# 2) Run sudo apt-get install awscli to install the AWSCLI
	# 3) Run aws configure (enter s3-authorized IAM user and specify region)
	# 4) Fill in DB host + name
	# 5) Create S3 bucket for the backups and fill it in below (set a lifecycle rule to expire files older than X days in the bucket)
	# 6) Run chmod +x backup.sh
	# 7) Test it out via ./backup.sh

PhongLe phonglh79