孙松 sunsongxp

Terraform, CoreOS, and Digital Ocean

Let's use Terraform to easily get a CoreOS cluster up on Digital Ocean. In this example we will get a 5 node CoreOS cluster up and running on the Digital Ocean 8GB size.

Install Terraform

Grab a copy of Terraform for your platform from http://www.terraform.io/downloads.html. Follow the instructions at http://www.terraform.io/intro/getting-started/install.html by getting Terraform in your PATH and testing that it works.

Digital Ocean API Key

omnibus-ansible

Install latest Ansible via pip + dependencies via a shell script

This file is used to install ansible in test kitchen when you set in the kitchen.yaml file

require_ansible_omnibus: true

By default test kitchen will always download and use the latest version of this install file.

WARNING: AS SOON AS YOU MERGE CODE HERE IT IS INSTANTLY AVAILABLE TO EVERYONE DOING OMNIBUS KITCHEN ANSIBLE INSTALLS:

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

Install and use pip on macOS without sudo / admin access

Most recently tested on macOS Sierra (10.12.6)

Download the installation script; curl https://bootstrap.pypa.io/get-pip.py -o ~/Downloads/get-pip.py
Run the installation, appending the --user flag; python ~/Downloads/get-pip.py --user. pip will be installed to ~/Library/Python/2.7/bin/pip
Make sure ~/Library/Python/2.7/bin is in your $PATH. For bash users, edit the PATH= line in ~/.bashrc to append the local Python path; ie. PATH=$PATH:~/Library/Python/2.7/bin. Apply the changes, source ~/.bashrc.
Use pip! Remember to append --user when installing modules; ie. pip install <package_name> --user

Note

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.

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

	if ($request_method = 'OPTIONS') {

	add_header 'Access-Control-Allow-Origin' $http_origin;

	#

	[Unit]
	Description=Live Syncing (Mirror) Daemon
	After=network.target

	[Service]
	Restart=always
	Type=simple
	Nice=19
	#EnvironmentFile=-/etc/default/lsyncd
	#ExecStart=/usr/bin/sh -c 'eval `/usr/bin/lsyncd -nodaemon $LSYNCD_OPTIONS /etc/lsyncd/lsyncd.conf.lua`'

	#!ipxe

	# To access this file via http use following redirection:
	# http://preseed.panticz.de/ipxe/menu.livecd.ipxe

	menu LiveCD
	item --gap Ubuntu:
	item live_ubuntu_16.04 Ubuntu Trusty 16.04 LiveCD
	item live_ubuntu_14.04 Ubuntu Trusty 14.04 LiveCD
	item live_ubuntu_12.04 Ubuntu Precise 12.04 LiveCD

	#!ipxe
	#dhcp
	echo Starting Ubuntu x64 installer for ${hostname}
	set base-url http://archive.ubuntu.com/ubuntu/dists/trusty/main/installer-amd64/current/images/netboot/ubuntu-installer/amd64
	kernel ${base-url}/linux
	initrd ${base-url}/initrd.gz
	imgargs linux auto=true fb=false priority=critical preseed/locale=en_GB kbd-chooser/method=gb preseed/url=http://172.16.195.128/ubuntuPreseed.cfg
	# DEBCONF_DEBUG=5
	boot \|\|
	# If everything failed, give the user some options

	1. Open regedit

	2. Navigate to "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"

	3. Change IPEnableRouter to 1

	4. Run services->Routing and Remote->start

	(reboot may be nessesary)