amhammett

Interact with VirtualBox directly

# List Running VMs
VBoxManage list runningvms

# Save State
VBoxManage controlvm <name|uuid> savestate

# Power-off with possible data loss

amhammett

The following command creates a relatively strong (as of 2018) certificate for the domain example.com that is valid for 3650 days (~10 years). It saves the private key into example.key and certificate into example.crt.

openssl req -x509 -newkey rsa:4096 -sha256 -nodes -keyout example.key -out example.crt -subj "/CN=example.com" -days 3650

source: @vog https://stackoverflow.com/a/41366949/8207662 https://stackoverflow.com/questions/10175812/how-to-create-a-self-signed-certificate-with-openssl

amhammett

node('foo') {
  step('bar') {
    println 'if [foobar] is not avaible, continue'
    
    try {
      foobar('me')
    } catch (NoSuchMethodError _) {
      echo "foobar task available with foobar plugin."
    }
  }

amhammett

---
- name: Adding elements to Arrays and Dictionaries
  hosts: localhost

  connection: local

  vars_files:
    - ./vars/common.yml

  tasks:

amhammett

suppose you have a file

'foo':
'1.12'
'bar':
'4.3'

and you want to end up with the following without manually updating each file

'foo': '1.12'

amhammett

if your var has stdout_lines, prettier output is fairly easy

- debug: msg="{{foo.stdout_lines}}"

if your var doesn't, you can still have pretty output

- debug: msg="foo.stderr.split('\n')"

amhammett

ref: ansible/ansible#6006

sometimes you need have three levels of quoting.

you are unable to do the following

- name: is the application running?
  debug: msg="''{{lookup('pipe', 'ps aux | grep [f]oo.js -c')}}'' != '0'"

this is a lie, the example doesn't work but shows how double-single quotes can be used.

amhammett

ref: ansible/ansible#15575

Problem: Horrible dev code requires secrets to be set via environment variables.

- name: show SECRETS environment variable
  debug: msg="{{lookup('env','SECRETS')|default('foo')}}

amhammett

defaulting unset attributes

Suppose you have some json/object which could have one of the following states.

# lookup success
{
	"applications": [{
		"id": 26097190
 }