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Snippets for yer computer needs

Cloud Hosting Providers

Dreamhost

Ruby on Rails

Phusion Passenger

https://www.phusionpassenger.com/library/admin/apache/

CLI:

# Get overall status
passenger-status
# current requests
passenger-status --show=requests
# restart app
passenger-config restart-app

Hiding Version Headers:

# Apache
LoadModule headers_module modules/mod_headers.so # if not already loaded
Header always unset "X-Powered-By"
Header always unset "X-Runtime"
# nginx (in http context)
passenger_show_version_in_header off;

Restarting Passenger

touch ~/example.com/tmp/restart.txt

Django (WSGI)

import sys, os
 
sys.path.append(os.getcwd())
sys.path.append(os.path.join(os.getcwd(), 'project'))

# Prepend virtualenv to path so that it's loaded first
sys.path.insert(0,'/home/user/example.com/venv/bin')
sys.path.insert(0,'/home/user/example.com/venv/lib/python2.6/site-packages/Django-1.4.3-py2.6.egg-info')
sys.path.insert(0,'/home/user/example.com/venv/lib/python2.6/site-packages')
	 
os.environ['DJANGO_SETTINGS_MODULE'] = "project.settings"
import django.core.handlers.wsgi
application = django.core.handlers.wsgi.WSGIHandler()

Heroku

Mac install

brew tap heroku/brew && brew install heroku

CLI

# Creating a new heroku site
heroku create

# Renaming a site
# TODO

Linode

# Install CLI
brew tap linode/cli
brew install linode-cli

AWS

ELB certs

# Upload a new cert
aws iam upload-server-certificate --server-certificate-name my-server-certificate  --certificate-body file://my-public-key-file.pem --private-key file://my-private-key-file.pem --certificate-chain file://my-certificate-chain-file.pem

IAM

Create a user

aws iam create-user --user-name <user>

Create an access key

aws iam create-access-key --user-name <user>

Attaching IAM roles to an instance

aws ec2 associate-iam-instance-profile --instance-id YourInstanceId --iam-instance-profile Name=YourNewRole-Instance-Profile

Signing Certificates

aws iam upload-signing-certificate --user-name user-name --certificate-body file://path/to/certificate.pem
aws iam list-signing-certificates --user-name user-name

Server certificates

# get cert names
aws iam list-server-certificates
# get cert details
aws iam get-server-certificate --server-certificate-name NAME
# upload cert
aws iam upload-server-certificate --server-certificate-name NAME --certificate-body file://public_key_cert_file.pem --private-key file://my_private_key.pem --certificate-chain file://my_certificate_chain_file.pem
# delete a cert
aws iam delete-server-certificate --server-certificate-name NAME

Cloudsplaining

https://github.com/salesforce/cloudsplaining

cloudsplaining download
cloudsplaining scan --input-file default.json --exclusions-file exclusions.yml

Resource-level permissions

Some permissions can’t be narrowed to something like a tag. This is an easy trip-up when you’re dealing policy creation, as they’ll need to be slightly different statements.

EC2

Get instance metadata from within VM

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html

curl http://169.254.169.254/

# Get list of IAM roles
curl http://169.254.169.254/latest/meta-data/iam/security-credentials/

# Get role credentials
curl http://169.254.169.254/latest/meta-data/iam/security-credentials/ROLE_NAME
# You'll likely want AccessKeyID, SecretAccessKey, and Token

Hypervisors

http://www.brendangregg.com/blog/2017-11-29/aws-ec2-virtualization-2017.html

Nitro

Nitro virtualization (YT)

Xen

IPv6

https://aws.amazon.com/blogs/aws/new-ipv6-support-for-ec2-instances-in-virtual-private-clouds/

EC2 AMIs

Get CentOS AMIs

aws --region us-east-1 ec2 describe-images --owners aws-marketplace --filters Name=product-code,Values=aw0evgkw8e5c1q413zgy5pjce

https://cloud.centos.org/centos/7/images/ https://wiki.centos.org/Cloud/AWS

Creating AMIs

VM Import

# Import an image
aws ec2 import-image --description "example-ami" --disk-containers file://ami_containers.json

# See progress of image imports
aws ec2 describe-import-image-tasks

https://docs.aws.amazon.com/vm-import/latest/userguide/vmimport-troubleshooting.html https://docs.aws.amazon.com/vm-import/latest/userguide/vmimport-image-import.html

S3

# Get object ACL
aws s3api get-bucket-acl --bucket BUCKET --key KEY

# Give bucket owner full permissions on the file
aws s3api put-bucket-acl --bucket BUCKET --key KEY --acl bucket-owner-full-control

s3cmd

set new ACL

s3cmd setacl s3://BUCKET/OBJECT --acl-grant=[read|write|read_acp|write_acp|full_control|all]:USER_CANONICAL_ID [--recursive]

Scout2

python Scout2.py --region REGION --force --no-browser

Secrets Manager

# Get secret
aws secretsmanager get-secret-value --secret-id NAME_or_ARN --version-stage AWSCURRENT
# Get resource policy
aws secretsmanager get-resource-policy --secret-id NAME_or_ARN

Transit Gateways

Cloud-agnostic management

Terraform

Syntax

# This is a comment
variable "ami" {
  description = "the AMI to use"
}

CLI

# taint/untaint a resource
terraform taint RESOURCE
terraform untaint RESOURCE

Using chef-vault

provisioner "chef" {

  # add instance to chef-vault
  vault_json = <<EOF
{
  "databag": [
    "item1",
    "item2"
  ]
}
EOF
}

https://www.terraform.io/docs/extend/writing-custom-providers.html

TF on Azure

Sentinel

https://docs.hashicorp.com/sentinel/downloads/

Cloud Custodian

https://github.com/cloud-custodian/cloud-custodian