Make the journald to syslog forwarding more robust

by increasing the maximum datagram queue length from 10 to 512.

Closes: #762700

debian/changelog

@@ -18,6 +18,10 @@ systemd (215-14) UNRELEASED; urgency=medium
   * boot-and-services, display-managers autopkgtests: Add missing python3 test
     dependency.
 
+  [ Christian Seiler ]
+  * Make the journald to syslog forwarding more robust by increasing the
+    maximum datagram queue length from 10 to 512. (Closes: #762700)
+
  -- Michael Biebl <biebl@debian.org>  Sat, 28 Mar 2015 09:27:07 +0100
 
 systemd (215-13) unstable; urgency=medium

debian/extra/systemd-setup-dgram-qlen.service

+[Unit]
+Description=Increase datagram queue length
+DefaultDependencies=no
+Before=syslog.socket
+ConditionPathIsReadWrite=/proc/sys/net/unix/max_dgram_qlen
+
+[Service]
+Type=oneshot
+ExecStart=/sbin/sysctl -w net.unix.max_dgram_qlen=512
+StandardOutput=null
+RemainAfterExit=yes

debian/patches/series

@@ -196,3 +196,4 @@ cgroup-don-t-trim-cgroup-trees-created-by-someone-el.patch
 core-don-t-fail-to-run-services-in-user-instances-if.patch
 PrivateTmp-shouldn-t-require-tmpfs.patch
 sysv-generator-add-support-for-etc-insserv-overrides.patch
+syslog-Increase-max_dgram_qlen-by-pulling-in-systemd.patch

debian/patches/syslog-Increase-max_dgram_qlen-by-pulling-in-systemd.patch

+From: Michael Biebl <biebl@debian.org>
+Date: Sun, 29 Mar 2015 20:55:32 +0200
+Subject: syslog: Increase max_dgram_qlen by pulling in
+ systemd-setup-dgram-qlen.service
+
+Closes: #762700
+---
+ units/syslog.socket | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/units/syslog.socket b/units/syslog.socket
+index e6e9cf8..457c4e8 100644
+--- a/units/syslog.socket
++++ b/units/syslog.socket
+@@ -15,6 +15,9 @@ Before=sockets.target shutdown.target
+ # Don't allow logging until the very end
+ Conflicts=shutdown.target
+ 
++# Increase max_dgram_qlen to a more reasonable value
++Wants=systemd-setup-dgram-qlen.service
++
+ [Socket]
+ ListenDatagram=/run/systemd/journal/syslog
+ SocketMode=0666

debian/rules

@@ -183,7 +183,11 @@ override_dh_install:
 		debian/systemd/lib/lsb/init-functions.d/40-systemd
 	install --mode=644 debian/tmpfiles.d/debian.conf \
 		debian/systemd/usr/lib/tmpfiles.d/
-	install --mode=644 debian/debian-fixup.service debian/ifup@.service debian/extra/getty-static.service debian/extra/hwclock-save.service \
+	install --mode=644 debian/debian-fixup.service \
+		debian/ifup@.service \
+		debian/extra/getty-static.service \
+		debian/extra/hwclock-save.service \
+		debian/extra/systemd-setup-dgram-qlen.service \
 		debian/systemd/lib/systemd/system/
 	install -D --mode=644 debian/extra/network-pre.conf \
 		debian/systemd/lib/systemd/system/networking.service.d/network-pre.conf