README: more skyflake

README.md

@@ -148,8 +148,8 @@ Infrastructure to run NixOS MicroVMs on a cluster. Our setup unifies
 networking with one bridge per VLAN. Persistent storage is replicated
 with Glusterfs.
 
-Recognize MicroVMs for Skyflake by modules containing
-`self.nixosModules.cluster-options`.
+Recognize nixosConfiguration for our Skyflake deployment by the
+`self.nixosModules.cluster-options` module being included.
 
 ## User interface
 
@@ -161,19 +161,29 @@ MicroVMs without name clashes.
 
 ### Deploying
 
-Push our repo to any machine in the cluster, preferably to Hydra
-because it just builds stuff and probably has most packages already in
-store.
+**git push** this repo to any machine in the cluster, preferably to
+Hydra because there building won't disturb any services.
 
 You don't deploy all MicroVMs at once. Instead, Skyflake allows you to
-select NixOS systems by the branches you push to.
+select NixOS systems by the branches you push to. **You must commit
+before you push!**
 
-**Example:** deploy hosts `mucbot` and `sdrweb`
+**Example:** deploy nixosConfigurations `mucbot` and `sdrweb` (`HEAD` is your
+current commit)
 
 ```bash
 git push c3d2@hydra.serv.zentralwerk.org:config HEAD:mucbot HEAD:sdrweb
 ```
 
+This will:
+1. Build the configuration on Hydra, refusing the branch update on
+   broken builds (through a git hook)
+2. Copy the MicroVM package and its dependencies to the binary cache
+   that is accessible to all nodes with Glusterfs
+3. Submit one job per MicroVM into the Nomad cluster
+
+*Deleting* a nixosConfiguration's branch will **stop** the MicroVM in Nomad.
+
 ### Updating
 
 **TODO:** how would you like it?