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// https://ip-ranges.amazonaws.com/ip-ranges.json
var k = {
	"syncToken": "1482877149",
	"createDate": "2016-12-27-22-19-09",
	"prefixes": [
		{
			"ip_prefix": "13.32.0.0/15",
			"region": "GLOBAL",
			"service": "AMAZON"
		},

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docker logs nginx 2>&1 | grep "127." 

# ref: http://stackoverflow.com/questions/34724980/finding-a-string-in-docker-logs-of-container

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eb ssh <eb environment name>

sudo docker ps

sudo docker exec -it <id of GitHub web hook container> sh

cd app && git pull

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http://stackoverflow.com/questions/36327096/vscode-linter-es6-es7-babel-linter/36327097#36327097

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# list running instances.
sudo docker ps

# show logs of a particular instance: 5b51cb779326
sudo docker logs 5b51cb779326

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# most restrictive for pem file.
chmod 400 path/to/your/.pem

# to add your .pem file to ~/.ssh/
ssh-add path/to/your/.pem

# e.g: login to gobike-api-dev environment, it reads from your /.ssh dir
eb ssh gobike-api-dev

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# to start laravel webserver.
artisan serve

# to start laravel schedulling.
artisan schedule:run

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#INTRODUCTION
# Vagrant is a virtual machine manager, it allows you to script the virtual machine configuration as well as the provisioning. 

# add 'laravel/homestead' to vm/virtual-box via vagrant, ref: https://laravel.com/docs/5.3/homestead#first-steps
vagrant box add laravel/homestead -c

# up and running, do it in ~/.homestead
vagrant init hashicorp/precise64
vagrant up

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# start mysql instance
mysql.server start


# performance_schema'.'session_variables' has the wrong structure
mysql_upgrade -u root -p --force
mysql.server restart #restart after this.

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{
   "containerDefinitions": [ 
      { 
         "command": [ "string" ],
         "cpu": number,
         "disableNetworking": boolean,
         "dnsSearchDomains": [ "string" ],
         "dnsServers": [ "string" ],
         "dockerLabels": { 
            "string" : "string"