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Shawn Sorichetti

Logging Into Multiple AWS SSO Sessions at Once

·2 mins
Aws Cli Productivity

I use Granted for per-terminal AWS credential assumptions — it’s great for switching between the multiple work accounts I juggle throughout the day. But I have SSO configured across more than one organization, and every morning I was logging into each one manually, one at a time, like a chump.

Turns out aws sso login has a --sso-session flag that targets a named session block from ~/.aws/config. So logging into multiple orgs is just two commands:

aws sso login --sso-session org-a
aws sso login --sso-session org-b

Each command opens a browser tab, you approve it, done. Both sessions are authenticated and ready for Granted to assume roles from — whichever account you need next.

The named sessions come from [sso-session <name>] blocks in your config:

[sso-session org-a]
sso_start_url = https://org-a.awsapps.com/start
sso_region = us-east-1

[sso-session org-b]
sso_start_url = https://org-b.awsapps.com/start
sso_region = us-west-2

Individual profiles then reference these with sso_session = org-a (or org-b), which is how Granted knows which upstream session to use when you switch profiles mid-day.

This doesn’t replace Granted at all — Granted still handles the per-tab assume step. This is just the upstream SSO login step, and knowing you can target named sessions directly makes the multi-org case a lot less tedious.

I’d been running aws sso login without the flag, which defaults to… something, and it wasn’t always obvious which org it was logging me into. The explicit --sso-session flag is strictly better.

via Perrotta.dev

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