openstack-dach-2015-orchestration

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openstack-dach-2015-orchestration

Presentation slides from OpenStack DACH Day 2015

On Github hastexo / openstack-dach-2015-orchestration

OpenStack

Orchestration

and

Automation

Inside and Out

Florian Haas, florian@hastexo.com

A few

words

to start with

You should

know

OpenStack

- This talk assumes familiarity with basic OpenStack concepts. - It is not for OpenStack novices.

You're welcome to

follow along

https://github.com/fghaas/openstack-dach-2015-orchestration

- All examples given in this talk are available from GitHub so you can follow along.

You'll

need

an OpenStack environment

- Following along requires that you currently have access to an OpenStack cluster via its Keystone, Nova, Glance and Neutron APIs (first part) and also via the Heat API (second part).

If you're

not able

or

not inclined

to follow along,

that's OK.

Just listen and participate in the discussion.

- If you do not have access to your own cluster right now, you can still follow along, ask questions, poke holes in my templates, and try the material next time you're back at the office.

Let's talk about

Automation

How

can we automate

virtual systems

in OpenStack?

Nova

user data

nova boot \
  --image trusty-server-cloudimg-amd64 \
  --key_name mykey \
  --flavor m1.small \
  --user-data userdata.txt \
  --nic net-id=4f0dcc21-4b6c-47db-b283-591fdb9aa5a7 \
  test0

This

is what user-data

typically

looks like:

#!/bin/sh -e

# Frobnicate a newly booted box

initialize_box
for foo in frobnications; do
  frobnicate_machine $foo || break
done

exit $?

Nope

You can do

better

Enter

cloud-config

cloud-config

enables you to

bootstrap

a newly booted VM

cloud-config is 100%

YAML

cloud-config is OpenStack's most

underrated

feature

cloud-config is Ubuntu's most

underrated

feature

What can we

do

with cloud-config?

package_update

package_upgrade

Update system on first boot

#cloud-config

package_update: true
package_upgrade: true

users

Configure users and groups

users:
- default
- name: foobar
  gecos: "Fred Otto Oscar Bar"
  groups: users,adm
  lock-passwd: false
  passwd: $6$rounds=4096$J86aZz0Q$To16RGzWJku0
  shell: /bin/bash
  sudo: "ALL=(ALL) NOPASSWD:ALL"

ssh_pwauth

Enable/disable SSH password authentication

ssh_pwauth: true

write_files

Write arbitrary files

write_files:
- path: /etc/hosts
  permissions: '0644'
  content: |
    127.0.0.1 localhost
    ::1       ip6-localhost ip6-loopback
    fe00::0   ip6-localnet
    ff00::0   ip6-mcastprefix
    ff02::1   ip6-allnodes
    ff02::2   ip6-allrouters

    192.168.122.100 deploy.example.com deploy
    192.168.122.111 alice.example.com alice
    192.168.122.112 bob.example.com bob
    192.168.122.113 charlie.example.com charlie

puppet

Configure a VM's Puppet agent

puppet:
 conf:
   agent:
     server: "puppetmaster.example.org"
     certname: "%i.%f"
   ca_cert: |
     -----BEGIN CERTIFICATE-----
     MIICCTCCAXKgAwIBAgIBATANBgkqhkiG9w0BAQUFADANMQswCQYDVQQDDAJjYTAe
     Fw0xMDAyMTUxNzI5MjFaFw0xNTAyMTQxNzI5MjFaMA0xCzAJBgNVBAMMAmNhMIGf
     MA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCu7Q40sm47/E1Pf+r8AYb/V/FWGPgc
     b014OmNoX7dgCxTDvps/h8Vw555PdAFsW5+QhsGr31IJNI3kSYprFQcYf7A8tNWu
     SIb3DQEBBQUAA4GBAH/rxlUIjwNb3n7TXJcDJ6MMHUlwjr03BDJXKb34Ulndkpaf
     +GAlzPXWa7bO908M9I8RnPfvtKnteLbvgTK+h+zX1XCty+S2EQWk29i2AdoqOTxb
     hppiGMp0tT5Havu4aceCXiy2crVcudj3NFciy8X66SoECemW9UYDCb9T5D0d
     -----END CERTIFICATE-----

chef

Configure a VM's Chef client

chef:
 install_type: "packages"
 force_install: false
 server_url: "https://chef.yourorg.com:4000"
 node_name: "your-node-name"
 environment: "production"
 validation_name: "yourorg-validator"
 validation_key: |
     -----BEGIN RSA PRIVATE KEY-----
     YOUR-ORGS-VALIDATION-KEY-HERE
     -----END RSA PRIVATE KEY-----
 run_list:
  - "recipe[apache2]"
  - "role[db]"
 initial_attributes:
    apache:
      prefork:
        maxclients: 100
      keepalive: "off"

packages

Install packages

packages:
  - ansible
  - git

Running

arbitrary commands

bootcmd

Run commands early in the boot sequence

bootcmd:
- ntpdate pool.ntp.org

runcmd

Run commands late in the boot sequence

runcmd:
  - >
    sudo -i -u training
    ansible-pull -v -i hosts 
    -U https://github.com/hastexo/academy-ansible 
    -o site.yml

Heat

(not an acronym)

Heat

enables you to deploy

complete

virtual environments

Heat

supports two distinct

formats

CFN

Amazon CloudFormation compatible template

HOT

Heat Orchestration Template

HOT is 100%

YAML

What can we

do

with Heat?

OS::Nova::Server

Configures Nova guests

resources:
  mybox:
    type: "OS::Nova::Server"
    properties:
      name: mybox
      image: trusty-server-cloudimg-amd64
      flavor: m1.small
      key_name: mykey

Now we could just

create

this stack

heat stack-create -f stack.yml mystack

But as it is,

it's not very

flexible

Let's add some

parameters

parameters:
  flavor:
    type: string
    description: Flavor to use for servers
    default: m1.medium
  image:
    type: string
    description: Image name or ID
    default: trusty-server-cloudimg-amd64
  key_name:
    type: string
    description: Keypair to inject into newly created servers

And some

intrinsic functions

resources:
  mybox:
    type: "OS::Nova::Server"
    properties:
      name: mybox
      image: { get_param: image }
      flavor: { get_param: flavor }
      key_name: { get_param: key_name }

And now we can

set

these parameters

heat stack-create -f stack.yml \
  -P key_name=mykey
  -P image=cirros-0.3.3-x86_64 \
  mystack

How about we add some

network connectivity

Wouldn't that be nice?

OS::Neutron::Net

OS::Neutron::Subnet

Defines Neutron networks

  mynet:
    type: "OS::Neutron::Net"
    properties:
      name: management-net

  mysub_net:
    type: "OS::Neutron::Subnet"
    properties:
      name: management-sub-net
      network: { get_resource: management_net }
      cidr: 192.168.122.0/24
      gateway_ip: 192.168.101.1
      enable_dhcp: true
      allocation_pools: 
        - start: "192.168.101.2"
          end: "192.168.101.50"

get_resource

Cross-reference between resources

Automatic dependency

OS::Neutron::Router

OS::Neutron::RouterGateway

OS::Neutron::RouterInterface

Configures Neutron routers

parameters:
  public_net:
    type: string
    description: Public network ID or name

resources:
  router:
    type: OS::Neutron::Router
  router_gateway:
    type: OS::Neutron::RouterGateway
    properties:
      router: { get_resource: router }
      network: { get_param: public_net }
  router_interface:
    type: OS::Neutron::RouterInterface
    properties:
      router: { get_resource: router }
      subnet: { get_resource: mysub_net }

OS::Neutron::Port

Configures Neutron ports

  mybox_management_port:
    type: "OS::Neutron::Port"
    properties:
      network: { get_resource: mynet }

  mybox:
    type: "OS::Nova::Server"
    properties:
      name: deploy
      image: { get_param: image }
      flavor: { get_param: flavor }
      key_name: { get_param: key_name }
      networks:
        - port: { get_resource: mybox_management_port }

OS::Neutron::SecurityGroup

Configures Neutron security groups

  mysecurity_group:
    type: OS::Neutron::SecurityGroup
    properties:
      description: Neutron security group rules
      name: mysecurity_group
      rules:
      - remote_ip_prefix: 0.0.0.0/0
        protocol: tcp
        port_range_min: 22
        port_range_max: 22
      - remote_ip_prefix: 0.0.0.0/0
        protocol: icmp
        direction: ingress

  mybox_management_port:
    type: "OS::Neutron::Port"
    properties:
      network: { get_resource: mynet }
      security_groups:
        - { get_resource: mysecurity_group }

OS::Neutron::FloatingIP

Allocates floating IP addresses

  myfloating_ip:
    type: "OS::Neutron::FloatingIP"
    properties:
      floating_network: { get_param: public_net }
      port: { get_resource: mybox_management_port }

outputs

Return stack values or attributes

outputs:
  public_ip:
    description: Floating IP address in public network
    value: { get_attr: [ myfloating_ip, floating_ip_address ] }

heat output-show \
  mystack public_ip

Integrating

Heat

with

cloud-init

  mybox:
    type: "OS::Nova::Server"
    properties:
      name: deploy
      image: { get_param: image }
      flavor: { get_param: flavor }
      key_name: { get_param: key_name }
      networks:
        - port: { get_resource: mybox_management_port }
      user_data: { get_file: cloud-config.yml }
      user_data_format: RAW

OS::Heat::CloudConfig

Manages cloud-config directly from Heat

resources:
  myconfig:
    type: "OS::Heat::CloudConfig"
    properties:
      cloud_config:
        package_update: true
        package_upgrade: true

  mybox:
    type: "OS::Nova::Server"
    properties:
      name: deploy
      image: { get_param: image }
      flavor: { get_param: flavor }
      key_name: { get_param: key_name }
      networks:
        - port: { get_resource: mybox_management_port }
      user_data: { get_resource: myconfig }
      user_data_format: RAW

Now we can also

set

cloud-config parameters

directly from Heat

parameters:
  # [...]
  username:
    type: string
    description: Additional login username
    default: foobar
  gecos:
    type: string
    description: Additional user full name
    default: ''

  myconfig:
    type: "OS::Heat::CloudConfig"
    properties:
      cloud_config:
        package_update: true
        package_upgrade: true
        users:
        - default
        - name: { get_param: username }
          gecos: { get_param: gecos }
          groups: "users,adm"
          lock-passwd: false
          passwd: '$6$WP9924IJiLSto8Ng$MSDwCvlT28jM'
          shell: "/bin/bash"
          sudo: "ALL=(ALL) NOPASSWD:ALL"
        ssh_pwauth: true

Congrats!

You've just built a Heat/cloud-config enabled stack!

More

information

http://cloudinit.readthedocs.org/

http://bazaar.launchpad.net/~cloud-init-dev/cloud-init/trunk/files/head:/doc/examples/

http://docs.openstack.org/hot-reference/

http://hastexo.github.io/openstack-dach-2015-orchestration

http://hastexo.github.io/openstack-dach-2015-orchestration

https://www.hastexo.com/openstack

http://hastexo.github.io/openstack-dach-2015-orchestration