Author: markj
Date: Thu May 30 15:17:35 2019
New Revision: 348427
URL: https://svnweb.freebsd.org/changeset/base/348427
Log:
MFC r348082:
Provide an example of using dhclient-script(5) to configure netdump.
Modified:
stable/12/sbin/dumpon/dumpon.8
Directory Properties:
stable/12/ (props changed)
Modified: stable/12/sbin/dumpon/dumpon.8
==============================================================================
--- stable/12/sbin/dumpon/dumpon.8 Thu May 30 15:15:47 2019
(r348426)
+++ stable/12/sbin/dumpon/dumpon.8 Thu May 30 15:17:35 2019
(r348427)
@@ -28,7 +28,7 @@
.\" From: @(#)swapon.8 8.1 (Berkeley) 6/5/93
.\" $FreeBSD$
.\"
-.Dd November 17, 2018
+.Dd May 21, 2019
.Dt DUMPON 8
.Os
.Sh NAME
@@ -283,6 +283,49 @@ Note that the live kernel might be at a different path
which can be examined by looking at the
.Va kern.bootfile
.Xr sysctl 8 .
+.Pp
+The
+.Nm
+.Xr rc 8
+script runs early during boot, typically before networking is configured.
+This makes it unsuitable for configuring
+.Xr netdump
+when the client address is dynamic.
+To configure
+.Xr netdump
+when
+.Xr dhclient
+binds to a server,
+.Xr dhclient-script
+can be used to run
+.Xr dumpon .
+For example, to automatically configure
+.Xr netdump
+on the vtnet0 interface, add the following to
+.Pa /etc/dhclient-exit-hooks .
+.Bd -literal
+case $reason in
+BOUND|REBIND|REBOOT|RENEW)
+ if [ "$interface" != vtnet0 ] || [ -n "$old_ip_address" -a \\
+ "$old_ip_address" = "$new_ip_address" ]; then
+ break
+ fi
+ if [ -n "$new_routers" ]; then
+ # Take the first router in the list.
+ gateway_flag="-g ${new_routers%% *}"
+ fi
+ dumpon -c $new_ip_address -s $server $gateway_flag vtnet0
+ ;;
+esac
+.Ed
+.Pp
+Be sure to fill in the server IP address and change the interface name if
+needed, and to configure
+.Pp
+.Dl dumpdev="NO"
+.Pp
+in
+.Pa /etc/rc.conf .
.Sh SEE ALSO
.Xr gzip 1 ,
.Xr kgdb 1 ,
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