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Kief Morris
kief@thoughtworks.com
INFRASTRUCTURE
IS
TERRIBLE
BUILD
RUN
EVOLVE
Kief Morris - Infrastructure is terrible
Languages
Testing
Architecture
Refactoring
😱
INFRASTRUCTURE
LANGUAGES
ARE
TERRIBLE
We want
Code that is:
EASY TO UNDERSTAND
EASY TO MAINTAIN
EASY TO IMPROVE
We get
HORRIFIC CODE
resource "aws_subnet" "private" {
count = "${length(split(",", var.availability_zones))}"
cidr_block = "${cidrsubnet(var.vpc_cidr, 8, count.index + length(split(",",
var.availability_zones)) + var.private_subnets_offset)}"
availability_zone = "${element(split (",", var.availability_zones), count.index)}"
}
resource "aws_route_table_association" "private" {
count = "${length(split(",",var.availability_zones))}"
subnet_id = "${element(aws_subnet.private.*.id, count.index)}"
route_table_id = "${aws_route_table.private.id}"
}
😱
History of
Infrastructure As Code
PART I:
PROCEDURAL SCRIPTS!
import 'cloud-api-library'
app_server = CloudApi.find_server($MY_SERVER_NAME)
if(app_server == null) {
network_segment = CloudApi.find_network_segment('private')
app_server = CloudApi.create_server(
name: $MY_SERVER_NAME,
image: 'base_linux',
cpu: 2,
ram: '2GB',
network: network_segment
)
while(app_server.ready == false) {
wait 5
}
app_server.provision(
provisioner: ansible,
role: tomcat_server
)
}
Logic ("how") overwhelms
what we're actually
interested in ("what")
Too much code is just
scaffolding
😢
😢
History of
Infrastructure As Code
PART II:
DECLARATIVE DSL!
server:
name: ${MY_SERVER_NAME}
image: 'base_linux'
cpu: 2
ram: 2GB
network: private_network_segment
provision:
provisioner: ansible
role: tomcat_server
The tool handles the
"undifferentiated heavy
lifting"
The language models
the infrastructure
Our code focuses on
what we care about
🙂
🙂
🙂
History of
Infrastructure As Code
PART III:
PROCEDURAL CODE!
DECLARATIVE DSLs
FOR INFRASTRUCTURE
ARE
TERRIBLE?
It's not really "code!"
🤓
😡 😫
😭
"Serverless"
uses servers!
"Immutable"
infrastructure
can change!
🤫
🤫
IDEs don't support
infrastructure DSLs
very wellSyntax
highlighting Code
refactoring😢 😢
- name: add several users
user:
name: "{{ item.name }}"
state: present
groups: "{{ item.groups }}"
fail:
msg: "The command ({{ item.cmd }}) did not have a 0 return code"
when: item.rc != 0
loop:
- { name: 'testuser1', groups: 'wheel' }
- { name: 'testuser2', groups: 'root' }
Mixing procedural and
declarative code is horrible
Separate concerns, and
language styles
[Procedural
Code]
[Declarative
Code]
[Procedural
Code]
server:
name: ${MY_SERVER_NAME}
base_image: ${our_linux_server_image}
provision:
provisioner: ansible
network:
vpc_id: ${base_vpc.id}
subnet_id: ${private_subnet.id}
route: ${route.appserver_inbound}
vip: ${load_balancer.appserver.vip}
firewall: ${inbound.firewall.rule.allow_https}
outbound: ${gateways.nat_1}
ssh_key: ${ssh_keys.ops}
roles: ${iam_role.appserver}
Infrastructure code is too
verbose
MODULES?
🤔
LIBRARIES!
😀
👍
Let's provision
infrastructure from
our application code!!
<table>
<tr><th>Name:</th><th>Job Title:</th><tr>
<%
db = database.connect('dbhost.mydomain.com')
rows = db.select('SELECT name, title FROM users')
for row in rows %>
<tr>
<td><%= row.name %></td><td><%= row.title %></td>
</tr>
</table>
<% db.close %>
NO.
JUST ...
NO.
😱
😡
🤬
IS TERRIBLE
INFRASTRUCTURE
CODE
Classic test pyramid
UNIT TESTS
INTEGRATION
TESTS
JOURNEY
TESTS
BROADERSCOPE
FASTERFEEDBACK
Infrastructure test pyramid??
UNIT(?) TESTS
STACK
TESTS
SYSTEM
TESTS
Often low
value, high
maintenance
Testing declarative code?
Prove that the tool works
Prove that the
cloud API works
Validate
contracts &
policies
Validate
combinations of
declared code
Validate
design
constraints
subnet:
name: private_A
address_block: 192.168.0.0/16
assert:
subnet("private_A").exists
assert:
subnet("private_A").address_block == "192.168.0.0/16"
OFFLINE
What can we test:
ONLINE
Server configuration
Syntax and formatting
(Some) logical things
Interactions of multiple
cloud elements
Functionality of cloud
elements
Swiss cheese testing model
OFFLINE
TESTS
STACK
TESTS
SYSTEM
TESTS
MONITOR-
ING
RISKS
https://dobetterascode.com
Good testing
requires
good design
Small,
loosely
coupled
pieces
IS TERRIBLE
INFRASTRUCTURE
We want:
To update and change
EASILY and SAFELY
Monolithic infrastructure
is hard to change
Decomposing infrastructure into
multiple stacks is a good step
But dependencies create risk
and friction for making changes
Goal: Minimize coupling in our
infrastructure designs and implementation
[code that
declares
a thing]
[code that
uses the
thing]
Coupling at the code level
😢
You need to know
how I've written my
code
If I change my code, I
may break your code
You need to run my
stuff in order to test
your stuff
Coupling to a tool's data
structures (e.g. statefiles) 😢
Coupled to the tool
and its data
structure formats
Integrate using a registry
Coupled on named
parameters, and
registry product
Goal: deploy and test a standalone
instance of your stuff
Mock
Test it in
isolation
Can swap out
dependencies
Kief Morris - Infrastructure is terrible
Provisioning a new
instance of
infrastructure is one
thing
Changing infrastructure
that's in use is another
Expand and contract
Expand and contract
v101
Expand and contract
v101
Expand and contract
v101
Expand and contract
v102
Expand and contract
v102
Expand and contract
v102
Closing Thoughts
Separate concerns
Find good conventions
Test based on risk
THANK YOU
Kief Morris
kief@thoughtworks.com

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