guardctrl.md

@@ -173,4 +173,14 @@ root@h1guardian1:~#
 If you happen to be cursed with segfaulting processes, here are some things that might help.
 ```shell
 # apt install python-dbg libepics3.15.3-dbg systemd-coredump
+```
+
+### systemd-coredump
+
+`systemd-coredump` is a particularly useful utility in this situation, since it captures and logs core dump files produces by crashing processes under systemd supervision.
+
+NOTE: the coredump files will expire and be cleaned out by 3 days by default.  To completely remove this expiration, creating the following file to override the defaults:
+```shell
+# cat > /etc/tmpfiles.d/00_coredump.conf
+d /var/lib/systemd/coredump 0755 root root -
 ```
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