[libvirt] [PATCH 3/3] virNetServerRun: Notify systemd that we're accepting clients
Michal Privoznik
mprivozn at redhat.com
Fri Feb 21 12:32:37 UTC 2014
Systemd does not forget about the cases, where client service needs to
wait for daemon service to initialize and start accepting new clients.
Setting a dependency in client is not enough as systemd doesn't know
when the daemon has initialized itself and started accepting new
clients. However, it offers a mechanism to solve this. The daemon needs
to call a special systemd function by which the daemon tells "I'm ready
to accept new clients". This is exactly what we need with
libvirtd-guests (client) and libvirtd (daemon). So now, with this
change, libvirt-guests.service is invoked not any sooner than
libvirtd.service calls the systemd notify function.
Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
configure.ac | 2 ++
daemon/libvirtd.service.in | 1 +
m4/virt-systemd-daemon.m4 | 34 ++++++++++++++++++++++++++++++++++
src/Makefile.am | 4 ++--
src/libvirt_private.syms | 1 +
src/rpc/virnetserver.c | 7 +++++++
src/util/virsystemd.c | 12 ++++++++++++
src/util/virsystemd.h | 2 ++
8 files changed, 61 insertions(+), 2 deletions(-)
create mode 100644 m4/virt-systemd-daemon.m4
diff --git a/configure.ac b/configure.ac
index 9e76353..f30ac76 100644
--- a/configure.ac
+++ b/configure.ac
@@ -239,6 +239,7 @@ LIBVIRT_CHECK_SANLOCK
LIBVIRT_CHECK_SASL
LIBVIRT_CHECK_SELINUX
LIBVIRT_CHECK_SSH2
+LIBVIRT_CHECK_SYSTEMD_DAEMON
LIBVIRT_CHECK_UDEV
LIBVIRT_CHECK_YAJL
@@ -2773,6 +2774,7 @@ LIBVIRT_RESULT_SANLOCK
LIBVIRT_RESULT_SASL
LIBVIRT_RESULT_SELINUX
LIBVIRT_RESULT_SSH2
+LIBVIRT_RESULT_SYSTEMD_DAEMON
LIBVIRT_RESULT_UDEV
LIBVIRT_RESULT_YAJL
AC_MSG_NOTICE([ libxml: $LIBXML_CFLAGS $LIBXML_LIBS])
diff --git a/daemon/libvirtd.service.in b/daemon/libvirtd.service.in
index dc2433a..e1f2a07 100644
--- a/daemon/libvirtd.service.in
+++ b/daemon/libvirtd.service.in
@@ -13,6 +13,7 @@ Documentation=man:libvirtd(8)
Documentation=http://libvirt.org
[Service]
+Type=notify
EnvironmentFile=-/etc/sysconfig/libvirtd
ExecStart=@sbindir@/libvirtd $LIBVIRTD_ARGS
ExecReload=/bin/kill -HUP $MAINPID
diff --git a/m4/virt-systemd-daemon.m4 b/m4/virt-systemd-daemon.m4
new file mode 100644
index 0000000..8516e41
--- /dev/null
+++ b/m4/virt-systemd-daemon.m4
@@ -0,0 +1,34 @@
+dnl The libsystemd-daemon.so library
+dnl
+dnl Copyright (C) 2012-2013 Red Hat, Inc.
+dnl
+dnl This library is free software; you can redistribute it and/or
+dnl modify it under the terms of the GNU Lesser General Public
+dnl License as published by the Free Software Foundation; either
+dnl version 2.1 of the License, or (at your option) any later version.
+dnl
+dnl This library is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+dnl Lesser General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU Lesser General Public
+dnl License along with this library. If not, see
+dnl <http://www.gnu.org/licenses/>.
+dnl
+
+AC_DEFUN([LIBVIRT_CHECK_SYSTEMD_DAEMON],[
+ LIBVIRT_CHECK_PKG([SYSTEMD_DAEMON], [libsystemd-daemon], [0.27.1])
+
+ old_CFLAGS="$CFLAGS"
+ old_LIBS="$LIBS"
+ CFLAGS="$CFLAGS $SYSTEMD_DAEMON_CFLAGS"
+ LIBS="$LIBS $SYSTEMD_DAEMON_LIBS"
+ AC_CHECK_FUNCS([sd_notify])
+ CFLAGS="$old_CFLAGS"
+ LIBS="$old_LIBS"
+])
+
+AC_DEFUN([LIBVIRT_RESULT_SYSTEMD_DAEMON],[
+ LIBVIRT_RESULT_LIB([SYSTEMD_DAEMON])
+])
diff --git a/src/Makefile.am b/src/Makefile.am
index 6d21e5d..6ef32ee 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -958,11 +958,11 @@ libvirt_util_la_SOURCES = \
libvirt_util_la_CFLAGS = $(CAPNG_CFLAGS) $(YAJL_CFLAGS) $(LIBNL_CFLAGS) \
$(AM_CFLAGS) $(AUDIT_CFLAGS) $(DEVMAPPER_CFLAGS) \
$(DBUS_CFLAGS) $(LDEXP_LIBM) $(NUMACTL_CFLAGS) \
- -I$(top_srcdir)/src/conf
+ $(SYSTEMD_DAEMON_CFLAGS) -I$(top_srcdir)/src/conf
libvirt_util_la_LIBADD = $(CAPNG_LIBS) $(YAJL_LIBS) $(LIBNL_LIBS) \
$(THREAD_LIBS) $(AUDIT_LIBS) $(DEVMAPPER_LIBS) \
$(LIB_CLOCK_GETTIME) $(DBUS_LIBS) $(MSCOM_LIBS) $(LIBXML_LIBS) \
- $(SECDRIVER_LIBS) $(NUMACTL_LIBS)
+ $(SECDRIVER_LIBS) $(NUMACTL_LIBS) $(SYSTEMD_DAEMON_LIBS)
noinst_LTLIBRARIES += libvirt_conf.la
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 0896287..21c6b66 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1826,6 +1826,7 @@ virSystemdCreateMachine;
virSystemdMakeMachineName;
virSystemdMakeScopeName;
virSystemdMakeSliceName;
+virSystemdNotifyStartup;
virSystemdTerminateMachine;
diff --git a/src/rpc/virnetserver.c b/src/rpc/virnetserver.c
index 8907768..be27913 100644
--- a/src/rpc/virnetserver.c
+++ b/src/rpc/virnetserver.c
@@ -38,6 +38,7 @@
#include "virnetservermdns.h"
#include "virdbus.h"
#include "virstring.h"
+#include "virsystemd.h"
#ifndef SA_SIGINFO
# define SA_SIGINFO 0
@@ -1085,6 +1086,12 @@ void virNetServerRun(virNetServerPtr srv)
goto cleanup;
}
+#ifdef WITH_SYSTEMD_DAEMON
+ /* We are accepting connections now. Notify systemd
+ * so it can start dependent services. */
+ virSystemdNotifyStartup();
+#endif
+
VIR_DEBUG("srv=%p quit=%d", srv, srv->quit);
while (!srv->quit) {
/* A shutdown timeout is specified, so check
diff --git a/src/util/virsystemd.c b/src/util/virsystemd.c
index 9247c92..8adf209 100644
--- a/src/util/virsystemd.c
+++ b/src/util/virsystemd.c
@@ -21,6 +21,10 @@
#include <config.h>
+#ifdef WITH_SYSTEMD_DAEMON
+# include <systemd/sd-daemon.h>
+#endif
+
#include "virsystemd.h"
#include "virdbus.h"
#include "virstring.h"
@@ -304,3 +308,11 @@ cleanup:
VIR_FREE(machinename);
return ret;
}
+
+void
+virSystemdNotifyStartup(void)
+{
+#ifdef WITH_SYSTEMD_DAEMON
+ sd_notify(0, "READY=1");
+#endif
+}
diff --git a/src/util/virsystemd.h b/src/util/virsystemd.h
index d9845e1..7fed456 100644
--- a/src/util/virsystemd.h
+++ b/src/util/virsystemd.h
@@ -46,4 +46,6 @@ int virSystemdTerminateMachine(const char *name,
const char *drivername,
bool privileged);
+void virSystemdNotifyStartup(void);
+
#endif /* __VIR_SYSTEMD_H__ */
--
1.9.0
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