diff --git a/bots/zephyr_mirror.py b/bots/zephyr_mirror.py
index 79db343..f01cd03 100755
--- a/bots/zephyr_mirror.py
+++ b/bots/zephyr_mirror.py
@@ -47,6 +47,8 @@ if options.sync_subscriptions:
 
 if options.forward_class_messages and not options.noshard:
     sys.path.append("/home/humbug/humbug")
+    if options.on_startup_command is not None:
+        subprocess.call([options.on_startup_command])
     from zerver.lib.parallel import run_parallel
     print "Starting parallel zephyr class mirroring bot"
     jobs = list("0123456789abcdef")
diff --git a/bots/zephyr_mirror_backend.py b/bots/zephyr_mirror_backend.py
index 8168ae2..f651ab0 100755
--- a/bots/zephyr_mirror_backend.py
+++ b/bots/zephyr_mirror_backend.py
@@ -890,6 +890,9 @@ def parse_args():
     parser.add_option('--site',
                       default=DEFAULT_SITE,
                       help=optparse.SUPPRESS_HELP)
+    parser.add_option('--on-startup-command',
+                      default=None,
+                      help=optparse.SUPPRESS_HELP)
     parser.add_option('--user',
                       default=os.environ["USER"],
                       help=optparse.SUPPRESS_HELP)
diff --git a/bots/zmirror-renew-kerberos b/bots/zmirror-renew-kerberos
new file mode 100755
index 0000000..3b68808
--- /dev/null
+++ b/bots/zmirror-renew-kerberos
@@ -0,0 +1,2 @@
+#!/bin/sh
+env KRB5CCNAME=/tmp/krb5cc_1000.tmp kinit -k -t /home/humbug/tabbott.extra.keytab tabbott/extra@ATHENA.MIT.EDU; mv /tmp/krb5cc_1000.tmp /tmp/krb5cc_1000