Fog::OpenStack
This is the plugin Gem to talk to OpenStack clouds via fog.
The main maintainers for the OpenStack sections are @dhague, @Ladas, @seanhandley, @mdarby and @jjasghar. Please send CC them on pull requests.
Supported OpenStack APIs
See the list of supported OpenStack projects.
Installation
Add this line to your application's Gemfile:
gem 'fog-openstack'
And then execute:
$ bundle
Or install it yourself as:
$ gem install fog-openstack
Usage
Initial Setup
Require the gem:
require "fog/openstack"
Checklist:
- Before you can do anything with an OpenStack cloud, you need to authenticate yourself with the identity service, "Keystone".
- All following examples assume that
@connection_paramsis a hash of valid connection information for an OpenStack cloud. - The
:openstack_usernameand:openstack_api_keykeys must map to a valid user/password combination in Keystone. - If you don't know what domain your user belongs to, chances are it's the
defaultdomain. By default, all users are a member of thedefaultdomain unless otherwise specified. - Keystone endpoints are version less. Version 3 is the default as v2.0 is deprecated. Meanwhile Keystone V3 still supports v2.0 for backward compatibility. Therefore passing a tenant instead of a project (along with a domain) makes Keystone provide v2.0 token. Connection parameters:
@connection_params = {
openstack_auth_url: "http://devstack.test:5000",
openstack_username: "admin",
openstack_api_key: "password",
openstack_project_name: "admin",
openstack_domain_id: "default"
}
If you're using Keystone V2, you don't need to supply domain details but ensure to either provide a tenant name (openstack_tenant)
or a tenant id (openstack_tenant_id). Alternatively you can use :openstack_identity_api_version parameter with 'v2.0'.
@connection_params = {
openstack_auth_url: "http://devstack.test:5000",
openstack_username: "admin",
openstack_api_key: "password",
openstack_tenant: "admin"
}
If you're not sure whether your OpenStack cloud uses Keystone V2 or V3 then you can find out by logging into the dashboard (Horizon) and navigating to "Access & Security" under the "Project" section. Select "API Access" and find the line for the Identity Service. If the endpoint has "v3" in it, you're on Keystone V3, if it has "v2" then (surprise) you're on Keystone V2.
If you need a version of OpenStack to test against, get youself a copy of DevStack.
Networking Gotcha
Note that tenants (aka projects) in OpenStack usually require that you create a default gateway router in order to allow external access to your instances.
The exception is if you're using Nova (and not Neutron) for your instance networking. If you're using Neutron, you'll want to set up your default gateway before you try to give instances public addresses (aka floating IPs).
Compute (Nova)
Initialise a connection to the compute service:
compute = Fog::OpenStack::Compute.new(@connection_params)
Get a list of available images for use with booting new instances:
p compute.images
# => <Fog::OpenStack::Compute::Images
# filters={},
# server=nil
# [
# <Fog::OpenStack::Compute::Image
# id="57a67f8a-7bae-4578-b684-b9b4dcd48d7f",
# ...
# >
# ]
# >
List available flavors so we can decide how powerful to make this instance:
p compute.flavors
# => <Fog::OpenStack::Compute::Flavors
# [
# <Fog::OpenStack::Compute::Flavor
# id="1",
# name="m1.tiny",
# ram=512,
# disk=1,
# vcpus=1,
# ...
# >,
# <Fog::OpenStack::Compute::Flavor
# id="2",
# name="m1.small",
# ram=2048,
# disk=20,
# vcpus=1,
# ...
# >,
# ...
Now we know the id numbers of a valid image and a valid flavor, we can instantiate an instance:
flavor = compute.flavors[0]
image = compute.images[0]
instance = compute.servers.create name: 'test',
image_ref: image.id,
flavor_ref: flavor.id
# Optionally, wait for the instance to provision before continuing
instance.wait_for { ready? }
# => {:duration=>17.359134}
p instance
# => <Fog::OpenStack::Compute::Server
# id="63633125-26b5-4fe1-a909-0f44d1ab3337",
# instance_name=nil,
# addresses={"public"=>[{"OS-EXT-IPS-MAC:mac_addr"=>"fa:16:3e:f4:75:ab", "version"=>4, "addr"=>"1.2.3.4", "OS-EXT-IPS:type"=>"fixed"}]},
# flavor={"id"=>"2"},
# host_id="f5ea01262720d02e886508bc4fa994782c516557d232c72aeb79638e",
# image={"id"=>"57a67f8a-7bae-4578-b684-b9b4dcd48d7f"},
# name="test",
# personality=nil,
# progress=0,
# accessIPv4="",
# accessIPv6="",
# availability_zone="nova",
# user_data_encoded=nil,
# state="ACTIVE",
# created=2016-03-07 08:07:36 UTC,
# updated=2016-03-07 08:07:52 UTC,
# tenant_id="06a9a90c60074cdeae5f7fdd0048d9ac"
# ...
# >
And destroy it when we're done:
instance.destroy
# => true
You'll probably need your instances to be accessible via SSH. Learn more about SSH keypairs.
Allow TCP traffic through port 22:
security_group = compute.security_groups.create name: "Test SSH",
description: "Allow access to port 22"
# => <Fog::OpenStack::Compute::SecurityGroup
# id="e5d53d00-b3f9-471a-b90f-985694b966ed",
# name="Test SSH",
# description="Allow access to port 22",
# security_group_rules= <Fog::OpenStack::Compute::SecurityGroupRules
# [
# ]
# >,
# tenant_id="06a9a90c60074cdeae5f7fdd0048d9ac"
# >
compute.security_group_rules.create parent_group_id: security_group.id,
ip_protocol: "tcp",
from_port: 22,
to_port: 22
key_pair = compute.key_pairs.create name: "My Public Key",
public_key: "/full/path/to/ssh.pub"
# => <Fog::OpenStack::Compute::KeyPair
# name="My Public Key",
# ...
# user_id="20746f49211e4037a91269df6a3fbf7b",
# id=nil
# >
Now create a new server using the security group and keypair we created:
instance = compute.servers.create name: "Test 2",
image_ref: image.id,
flavor_ref: flavor.id,
key_name: key_pair.name,
security_groups: security_group
# => <Fog::OpenStack::Compute::Server
# id="e18ebdfb-e5f5-4a45-929f-4cc9926dc2c7",
# name="Test 2",
# state="ACTIVE",
# tenant_id="06a9a90c60074cdeae5f7fdd0048d9ac",
# key_name="My Public Key",
# >
# (some data omitted for brevity)
Finally, assign a floating IP address to make this instance sit under a world-visible public IP address:
pool_name = compute.addresses.get_address_pools[0]['name']
floating_ip_address = compute.addresses.create pool: pool_name
instance.associate_address floating_ip_address.ip
p floating_ip_address
# => <Fog::OpenStack::Compute::Address
# id="54064324-ce7d-448d-9753-94497b29dc91",
# ip="1.2.3.4",
# pool="external",
# fixed_ip="192.168.0.96",
# instance_id="e18ebdfb-e5f5-4a45-929f-4cc9926dc2c7"
# >
Now you can SSH into the instance:
$ ssh [email protected]
The authenticity of host '1.2.3.4 (1.2.3.4)' can't be established.
RSA key fingerprint is SHA256:cB0L/owUtcHsMhFhsuSZXxK4oRg/uqP/6IriUomQnQQ.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '1.2.3.4' (RSA) to the list of known hosts.
$ pwd
/home/cirros
Volume (Cinder)
Create and attach a volume to a running instance:
compute = Fog::OpenStack::Compute.new(@connection_params)
volume = compute.volumes.create name: "Test",
description: "Testing",
size: 1
# => <Fog::OpenStack::Compute::Volume
# id="4a212986-c6b6-4a93-8319-c6a98e347750",
# name="Test",
# description="Testing",
# size=1,
# availability_zone="Production",
# created_at="2016-03-07T13:40:43.914063",
# attachments=[{}]
# >
flavor = compute.flavors[3]
image = compute.images[0]
instance = compute.servers.create name: "test",
image_ref: image.id,
flavor_ref: flavor.id
instance.wait_for { ready? }
volume.reload
instance.attach_volume(volume.id, "/dev/vdb")
Detach volume and create a snapshot:
instance.detach_volume(volume.id)
volume.reload
compute.snapshots.create volume_id: volume.id,
name: "test",
description: "test"
# => <Fog::OpenStack::Compute::Snapshot
# id="7a8c9192-25ee-4364-be91-070b7a6d9855",
# name="test",
# description="test",
# volume_id="4a212986-c6b6-4a93-8319-c6a98e347750",
# status="creating",
# size=1,
# created_at="2016-03-07T13:47:11.543814"
# >
Destroy a volume:
volume.destroy
# => true
Image (Glance)
Download Glance image:
image = Fog::OpenStack::Image.new(@connection_params)
image_out = File.open("/tmp/cirros-image-download", 'wb')
streamer = lambda do |chunk, _, _|
image_out.write chunk
end
image.download_image(image.images.first.id, response_block: streamer)
Create Glance image from file or URL:
cirros_location = "http://download.cirros-cloud.net/0.3.4/cirros-0.3.4-x86_64-disk.img"
image_out = File.open("/tmp/cirros-image-#{SecureRandom.hex}", 'wb')
streamer = lambda do |chunk, _, _|
image_out.write chunk
end
Excon.get cirros_location, response_block: streamer
image_out.close
image_handle = image.images.create name: "cirros",
disk_format: "qcow2",
container_format: "bare"
# => <Fog::OpenStack::Image::V2::Image
# id="67c4d02c-5601-4619-bd14-d2f7f96a046c",
# name="cirros",
# visibility="private",
# tags=[],
# self="/v2/images/67c4d02c-5601-4619-bd14-d2f7f96a046c",
# size=nil,
# disk_format="qcow2",
# container_format="bare",
# id="67c4d02c-5601-4619-bd14-d2f7f96a046c",
# checksum=nil,
# self="/v2/images/67c4d02c-5601-4619-bd14-d2f7f96a046c",
# file="/v2/images/67c4d02c-5601-4619-bd14-d2f7f96a046c/file",
# min_disk=0,
# created_at="2016-10-31T03:38:28Z",
# updated_at="2016-10-31T03:38:28Z",
# protected=false,
# status="queued",
# min_ram=0,
# owner="6b9ec8080b8443c5afe2267a39b9bf74",
# properties=nil,
# metadata=nil,
# location=nil,
# network_allocated=nil,
# base_image_ref=nil,
# image_type=nil,
# instance_uuid=nil,
# user_id=nil
# >
image_handle.upload_data File.binread(image_out.path)
Destroy image:
cirros = image.images.get("4beedb46-e32f-4ef3-a87b-7f1234294dc1")
cirros.destroy
Identity (Keystone)
List domains (Keystone V3 only):
identity = Fog::OpenStack::Identity.new(@connection_params)
identity.domains
# => <Fog::OpenStack::Identity::V3::Domains
# [
# <Fog::OpenStack::Identity::V3::Domain
# id="default",
# description="",
# enabled=true,
# name="Default",
# >
# ]
# >
List projects (aka tenants):
identity.projects
# => <Fog::OpenStack::Identity::V3::Projects
# [
# <Fog::OpenStack::Identity::V3::Project
# id="008e5537d3424295a03560abc923693c",
# domain_id="default",
# description="Project 1",
# enabled=true,
# name="project_1",
# >,
# ...
# ]
# On Keystone V2
identity.tenants
# => <Fog::OpenStack::Identity::V2::Tenants
# [ ... ]
List users:
identity.users
# => <Fog::OpenStack::Identity::V3::Users
# [ ... ]
Create/destroy new user:
project_id = identity.projects[0].id
user = identity.users.create name: "test",
project_id: project_id,
email: "[email protected]",
password: "test"
# => <Fog::OpenStack::Identity::V3::User
# id="474a59153ebd4e709938e5e9b614dc57",
# default_project_id=nil,
# description=nil,
# domain_id="default",
# email="[email protected]",
# enabled=true,
# name="test",
# password="test"
# >
user.destroy
# => true
Create/destroy new tenant:
project = identity.projects.create name: "test",
description: "test"
# => <Fog::OpenStack::Identity::V3::Project
# id="423559128a7249f2973cdb7d5d581c4d",
# domain_id="default",
# description="test",
# enabled=true,
# name="test",
# parent_id=nil,
# subtree=nil,
# parents=nil
# >
project.destroy
# => true
Grant user role on tenant and revoke it:
role = identity.roles.select{|role| role.name == "_member_"}[0]
# => <Fog::OpenStack::Identity::V3::Role
# id="9fe2ff9ee4384b1894a90878d3e92bab",
# name="_member_",
# >
project.grant_role_to_user(role.id, user.id)
project.revoke_role_from_user(role.id, user.id)
Networking (Neutron)
Set up a project's public gateway (needed for external access):
identity = Fog::OpenStack::Identity.new(@connection_params)
tenants = identity.projects.select do |project|
project.name == @connection_params[:openstack_project_name]
end
tenant_id = tenants[0].id
neutron = Fog::OpenStack::Network.new(@connection_params)
network = neutron.networks.create name: "default",
tenant_id: tenant_id
subnet = network.subnets.create name: "default",
cidr: "192.168.0.0/24",
network_id: network.id,
ip_version: 4,
dns_nameservers: ["8.8.8.8", "8.8.4.4"],
tenant_id: tenant_id
external_network = neutron.networks.select(&:router_external)[0]
router = neutron.routers.create name: 'default',
tenant_id: tenant_id,
external_gateway_info: external_network.id
neutron.add_router_interface router.id, subnet.id
Further Reading
- See the documentation directory for more examples.
- Read the OpenStack API documentation.
- Also, remember that reading the code itself is the best way to educate yourself on how best to interact with this gem.
Development
$ git clone https://github.com/fog/fog-openstack.git # Clone repository
$ cd fog-openstack; bin/setup # Install dependencies from project directory
$ bundle exec rake test # Run tests
$ bundle exec rake spec # Run tests
$ bin/console # Run interactive prompt that allows you to experiment (optional)
$ bundle exec rake install # Install gem to your local machine (optional)
You can also use a docker image for development and running tests. Once you have cloned the repository, it can be run with:
$ docker-compose up test
$ docker-compose up ruby # Start a container with the ruby environment
In order to release a new version, perform the following steps:
- Update version number in
version.rb. - Run
bundle exec rake release, which will create a git tag for the version. - Push git commits and tags.
- Push the
.gemfile to rubygems.org.
Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/fog/fog-openstack. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.
License
The gem is available as open source under the terms of the MIT License.