One of the most powerful tools that Fastly offers is worldwide, instant purge. Come learn the ins and outs of how HTTP invalidation works in general and how purge and surrogate keys can be used to improve your site's delivery and get even more value from Fastly. This talk will also cover the purge blast radius Surrogate Keys are an amazing way to purge your content from cache, but they can be a bit scary when you aren't sure how many URLs this surrogate key is tied to or what kind of affect this will have on origin. Join the USA Today Network as we explain how we leverage big data tools, Go APIs, New Relic, and Sumo Logic to provide our users a suite of tools for purging content from Fastly. Developers love knowing the blast radius of their surrogate keys, while our engineers love the real-time metrics and notifications we get when developers are hard-purging content.

1. Fastly Purge Control
at the

3. Kris Vincent
Manager - Developer Solutions
Platform Engineering
Go developer, manager, CDN evangelist, Jeep off-roader, rock climber,
and party parrot contributor.
Soon Kayla Bridget Zach Raghu

4. What is a surrogate key?
mobile
3-23-2018
animation
life
video-3-23

5. Do you even Surrogate?
1000s of Surrogate Keys
From Origin & Custom VCL Rules
Date Based
10-12-2018 | 10-2018
Site Based
indystar | tallahassee
Content Based
elections | olympics

6. How we log surrogate keys
gcslogging {
name = "gannett-product-development"
email = "${var.FASTLY_GCS_EMAIL}"
bucket_name = "gannett-fastly-logs-development"
secret_key = "${var.FASTLY_GCS_SECRET_KEY}"
gzip_level = 3
message_type = "blank"
response_condition = "no_logging"
}
HashiCorp
Terraform

7. How we log surrogate keys
sub vcl_log {
declare local var.temp STRING;
set var.temp = regsuball(req.http.Surrogate-Key, " ", "|");
log "syslog " req.service_id " gannett-product-development :: {"
{""service_id":""} req.service_id {"", "}
{""surrogates":""} "|" var.temp "|" {"", "}
{""host":""} req.http.host {"", "}
{""url":""} req.url {"""}
"}";
#FASTLY log

8. Dataflow
Fastly
GCS
Pub/Sub
Memory
Store
Google Big Data Pipeline
BigQuery

9. Can I hard purge {surrogateKey}?
How impactful would this be?
Purge surrogate key… "elections"
GET /v1/blastRadius/{serviceID}/{surrogateKey}
{ "key": "elections", "URLs": 123044 }

10. Fronting Fastly’s purge API
~for fun and profit~
CDN-Obliviate

11. Fronting Fastly’s purge API
~for fun and profit~
Announcements
Metrics
Protection
Logging
POST
/v1/purge/{serviceID}/{surrogateKey}

12. Fronting Fastly’s purge API
~for fun and profit~
x-surrogate-date-start: 10-1-2018
x-surrogate-date-end: 10-7-2018
-- or --
x-surrogate-month-start: 10-2018
x-surrogate-month-end: 11-2018
-- or --
x-surrogate-custom-prepend: explainer-
x-surrogate-custom-start: explainer-1
x-surrogate-custom-end: explainer-20
x-wait-between-batches
x-batch-size
POST
/v1/rolling-purge/{serviceID}

13. What else can we do with this data?

14. Pre-Warming the Cache
POST
/v1/prewarm/{serviceID}/{surrogateKey}/{duration}
{ "warmId": "1cak2kva", "key": "elections",
"URLs": 123040, "URLsPerMin": 2050 }
User-Agents
Desktop
Mobile - Android
Mobile - iPhone
Other modifiers
Language
Location

15. Slack
Active Directory Group Membership
Purge Dialog
{serviceSelect} - Sourced List of Services
{surrogateKey} - Enter Key
Blast Radius
Ephemeral message:
{surrogateKey} will purge 120433 URLs

16. • Tools to make everything easier
• Better Understanding
• Accountability &
Communication
• Fewer mistakes
What has this changed?

17. ?
Questions
@kbvincent1990 /in/krisvincent/ @krisvincent