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-There's a lot of reasons to not deploy code to production on a Friday.
-If something goes wrong, you might end up spending your Friday night, or
-worst, your entire weekend, fixing some issue. But there's no reasons
-Friday should be different from any other day. It's not OK to spend a
-night during the week fixing an issue in production.
-
-To be in a place where you can deploy code at any time requires a few
-things: tools, automation and culture.
-
-In my team, every body is on call: SWEs and SREs. We all share the same
-responsibilities. There's no rule saying that deploying on Friday is
-forbidden. We don't do continuous deployment, and we also don't have a
-schedule saying which days of the week we deploy.
-
-Artifacts are build by our build system and pushed to some archives. We
-don't deploy artifacts that we build on a developer laptop.
-
-Before deploying an artifact to production, we usually run it as a a
-canary on some shards. Depending of the service, it can be for a few
-hours up to a couple of weeks. Once we are confident in this artifact,
-after reviewing our dashboards, we know it's going to be safe to deploy
-it.
-
-We communicate with the team (and outside the team) before doing a
-deployment. A deploy starts with a ticket in Jira, saying what we are
-going to deploy, how long it will take, and what are the steps to
-validate, and do a rollback. At least one another person need to review
-the ticket and give his consent. If that person has some concerns, the
-deploy is pushed back, and we figure out what's wrong. On-call has to
-ACK the procedure before starting too.
-
-Our deployments are hooked with our alerts. If something goes wrong, the
-deployment is paused, or roll backed.
-
-Once it becomes easy to build test deploy and rollback, then there's no
-reasons to not deploy code on Friday.