[docs] Add more information to reconfigurator-dev-guide (#8228)

Author: karencfv

docs/reconfigurator-dev-guide.adoc

@@ -954,7 +954,7 @@ Prerequisite: you must already have an _unpacked_ TUF repo.  You could <<task-do
 For testing SP updates, we don't need the host OS and control plane images, which are by far the largest files in the repo.  You can delete them with:
 
 ```
-$ rm -f repo/targets/*.host* repo/targets/*.trampoline-* repo/targets/*.control-plane-*
+$ rm -f repo/targets/*.host* repo/targets/*.trampoline-* repo/targets/*.control_plane-*
 ```
 
 Then copy this directory tree over to the switch zone.
@@ -1289,6 +1289,24 @@ For a4x2: copy this binary to the switch zone and run it from there.  You'll nee
 
 For `omicron-dev run-all`, you can run this command from the same system where you're running `omicron-dev`.  Instead of `--interface`, you need to use the `--sp-sim-addr IPV6_ADDR:PORT` option to point `faux-mgs` at the simulated SP.  Unfortunately, the easiest way to find the address and port of the simulated SP is in the log file whose path is printed out by `omicron-dev run-all`.
 
+You can find the necessary addresses for each interface during the initial SP discovery phase:
+
+```
+$ cat /tmp/omicron-dev-omicron-dev.20224.2.log | grep "SP discovery" | looker
+01:08:25.680Z DEBG 645532bc-27f9-4602-bd3a-cff17d678bde (ManagementSwitch): attempting initial SP discovery
+    discovery_addr = [::1]:36109
+    interface = fake-switch0
+01:08:25.680Z DEBG 645532bc-27f9-4602-bd3a-cff17d678bde (ManagementSwitch): attempting initial SP discovery
+    discovery_addr = [::1]:47800
+    interface = fake-switch1
+01:08:25.680Z DEBG 645532bc-27f9-4602-bd3a-cff17d678bde (ManagementSwitch): attempting initial SP discovery
+    discovery_addr = [::1]:55043
+    interface = fake-sled0
+01:08:25.680Z DEBG 645532bc-27f9-4602-bd3a-cff17d678bde (ManagementSwitch): attempting initial SP discovery
+    discovery_addr = [::1]:50632
+    interface = fake-sled1
+```
+
 ---
 
 However you get `faux-mgs` running, you can use it to inspect state and https://github.com/oxidecomputer/meta/blob/master/engineering/mupdate/manual-rot-sp-updates.adoc[perform updates by hand].  (If you follow those linked instructions, note that they use `pilot sp exec -e CMD SERIAL`.  This is a thin wrapper that finds the right interface for the host with serial `SERIAL` and then runs `faux-mgs --interface INTERFACE CMD`.  You can just do this transformation yourself.)
@@ -1343,4 +1361,13 @@ Sled SimGimlet00
 ...
 ```
 
+If you're running `omicron-dev run-all`, you'll need to use the `--dns-server` flag to specify
+the DNS server `omdb` will use. You can find this information within the `omicron-dev run-all` output:
+
+```
+...
+omicron-dev: internal DNS:          [::1]:63673
+...
+```
+
 This is a handy summary, but it only gets updated when inventory is collected.  This is more cumbersome than `faux-mgs` when you only need to get one piece of information and need it to be up-to-date.