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+# Bastion
+
+Bastion is an EC2 deployed in the `us-west-1` AWS region,
+used to access other servers inside our VPC.
+
+You can learn more about what a bastion is on
+[Wikipedia](https://en.wikipedia.org/wiki/Bastion_host)
+
+It is managed in the
+[terraform/bastion](https://github.com/rust-lang/simpleinfra/blob/master/terraform/bastion/README.md)
+module.
+
+## Versions
+
+We need to keep the Ubuntu version of the EC2 up-to-date.