[libvirt] [PATCH 08/14] Enable systemd socket activation with virtlockd
Daniel P. Berrange
berrange at redhat.com
Tue Dec 11 20:41:42 UTC 2012
From: "Daniel P. Berrange" <berrange at redhat.com>
This enhancement virtlockd so that it can receive a pre-opened
UNIX domain socket from systemd at launch time, and adds the
systemd service/socket unit files
* daemon/libvirtd.service.in: Require virtlockd to be running
* libvirt.spec.in: Add virtlockd systemd files
* src/Makefile.am: Install systemd files
* src/locking/lock_daemon.c: Support socket activation
* src/locking/virtlockd.service.in, src/locking/virtlockd.socket.in:
systemd unit files
* src/rpc/virnetserverservice.c, src/rpc/virnetserverservice.h:
Add virNetServerServiceNewFD() method
* src/rpc/virnetsocket.c, src/rpc/virnetsocket.h: Add virNetSocketNewListenFD
method
Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
---
libvirt.spec.in | 6 ++++
src/Makefile.am | 51 ++++++++++++++++++++++++++--
src/locking/lock_daemon.c | 73 ++++++++++++++++++++++++++++++++++++++--
src/locking/virtlockd.service.in | 13 +++++++
src/locking/virtlockd.socket.in | 8 +++++
5 files changed, 147 insertions(+), 4 deletions(-)
create mode 100644 src/locking/virtlockd.service.in
create mode 100644 src/locking/virtlockd.socket.in
diff --git a/libvirt.spec.in b/libvirt.spec.in
index e12fca4..aebece3 100644
--- a/libvirt.spec.in
+++ b/libvirt.spec.in
@@ -1499,6 +1499,7 @@ done
%else
if [ $1 -eq 1 ] ; then
# Initial installation
+ /bin/systemctl enable virtlockd.socket >/dev/null 2>&1 || :
/bin/systemctl enable libvirtd.service >/dev/null 2>&1 || :
fi
%endif
@@ -1526,8 +1527,10 @@ fi
%else
if [ $1 -eq 0 ] ; then
# Package removal, not upgrade
+ /bin/systemctl --no-reload disable virtlockd.socket > /dev/null 2>&1 || :
/bin/systemctl --no-reload disable libvirtd.service > /dev/null 2>&1 || :
/bin/systemctl stop libvirtd.service > /dev/null 2>&1 || :
+ /bin/systemctl stop virtlockd.service > /dev/null 2>&1 || :
fi
%endif
%else
@@ -1545,6 +1548,7 @@ fi
/bin/systemctl daemon-reload >/dev/null 2>&1 || :
if [ $1 -ge 1 ] ; then
# Package upgrade, not uninstall
+ /bin/systemctl try-restart virtlockd.service >/dev/null 2>&1 || :
/bin/systemctl try-restart libvirtd.service >/dev/null 2>&1 || :
fi
%endif
@@ -1659,6 +1663,8 @@ fi
%if %{with_systemd}
%{_unitdir}/libvirtd.service
+%{_unitdir}/virtlockd.service
+%{_unitdir}/virtlockd.socket
%else
%{_sysconfdir}/rc.d/init.d/libvirtd
%{_sysconfdir}/rc.d/init.d/virtlockd
diff --git a/src/Makefile.am b/src/Makefile.am
index f0a9a03..8dbb6a5 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1611,6 +1611,53 @@ virtlockd.init: locking/virtlockd.init.in $(top_builddir)/config.status
+EXTRA_DIST += locking/virtlockd.service.in locking/virtlockd.socket.in
+
+if WITH_LIBVIRTD
+if LIBVIRT_INIT_SCRIPT_SYSTEMD
+
+SYSTEMD_UNIT_DIR = /lib/systemd/system
+
+BUILT_SOURCES += virtlockd.service virtlockd.socket
+
+install-systemd: virtlockd.init install-sysconfig
+ mkdir -p $(DESTDIR)$(SYSTEMD_UNIT_DIR)
+ $(INSTALL_SCRIPT) virtlockd.service \
+ $(DESTDIR)$(SYSTEMD_UNIT_DIR)/
+ $(INSTALL_SCRIPT) virtlockd.socket \
+ $(DESTDIR)$(SYSTEMD_UNIT_DIR)/
+
+uninstall-systemd: uninstall-sysconfig
+ rm -f $(DESTDIR)$(SYSTEMD_UNIT_DIR)/virtlockd.service
+ rm -f $(DESTDIR)$(SYSTEMD_UNIT_DIR)/virtlockd.socket
+else
+install-systemd:
+uninstall-systemd:
+endif
+else
+install-systemd:
+uninstall-systemd:
+endif
+
+virtlockd.service: locking/virtlockd.service.in $(top_builddir)/config.status
+ $(AM_V_GEN)sed \
+ -e "s!::localstatedir::!$(localstatedir)!g" \
+ -e "s!::sbindir::!$(sbindir)!g" \
+ -e "s!::sysconfdir::!$(sysconfdir)!g" \
+ < $< > $@-t && \
+ chmod a+x $@-t && \
+ mv $@-t $@
+
+virtlockd.socket: locking/virtlockd.socket.in $(top_builddir)/config.status
+ $(AM_V_GEN)sed \
+ -e "s!::localstatedir::!$(localstatedir)!g" \
+ -e "s!::sbindir::!$(sbindir)!g" \
+ -e "s!::sysconfdir::!$(sysconfdir)!g" \
+ < $< > $@-t && \
+ chmod a+x $@-t && \
+ mv $@-t $@
+
+
if HAVE_SANLOCK
lockdriverdir = $(libdir)/libvirt/lock-driver
lockdriver_LTLIBRARIES = sanlock.la
@@ -1848,7 +1895,7 @@ endif
endif
EXTRA_DIST += $(SECURITY_DRIVER_APPARMOR_HELPER_SOURCES)
-install-data-local: install-init
+install-data-local: install-init install-systemd
if WITH_LIBVIRTD
$(MKDIR_P) "$(DESTDIR)$(localstatedir)/lib/libvirt/lockd"
$(MKDIR_P) "$(DESTDIR)$(localstatedir)/run/libvirt/lockd"
@@ -1901,7 +1948,7 @@ if WITH_NETWORK
$(DESTDIR)$(sysconfdir)/libvirt/qemu/networks/autostart/default.xml
endif
-uninstall-local:: uninstall-init
+uninstall-local:: uninstall-init uninstall-systemd
if WITH_LIBVIRTD
rmdir "$(DESTDIR)$(localstatedir)/lib/libvirt/lockd" ||:
rmdir "$(DESTDIR)$(localstatedir)/run/libvirt/lockd" ||:
diff --git a/src/locking/lock_daemon.c b/src/locking/lock_daemon.c
index 3c007f1..7727deb 100644
--- a/src/locking/lock_daemon.c
+++ b/src/locking/lock_daemon.c
@@ -496,8 +496,69 @@ virLockDaemonSetupSignals(virNetServerPtr srv)
return 0;
}
+
static int
-virLockDaemonSetupNetworking(virNetServerPtr srv, const char *sock_path)
+virLockDaemonSetupNetworkingSystemD(virNetServerPtr srv)
+{
+ virNetServerServicePtr svc;
+ const char *pidstr;
+ const char *fdstr;
+ unsigned long long procid;
+ unsigned int nfds;
+
+ if (!(pidstr = getenv("LISTEN_PID"))) {
+ VIR_DEBUG("No LISTEN_FDS from systemd");
+ return 0;
+ }
+
+ if (virStrToLong_ull(pidstr, NULL, 10, &procid) < 0) {
+ VIR_DEBUG("Malformed LISTEN_PID from systemd %s", pidstr);
+ return 0;
+ }
+
+ if ((pid_t)procid != getpid()) {
+ VIR_DEBUG("LISTEN_PID %s is not for us %llu",
+ pidstr, (unsigned long long)getpid());
+ return 0;
+ }
+
+ if (!(fdstr = getenv("LISTEN_FDS"))) {
+ VIR_DEBUG("No LISTEN_FDS from systemd");
+ return 0;
+ }
+
+ if (virStrToLong_ui(fdstr, NULL, 10, &nfds) < 0) {
+ VIR_DEBUG("Malformed LISTEN_FDS from systemd %s", fdstr);
+ return 0;
+ }
+
+ if (nfds > 1) {
+ VIR_DEBUG("Too many (%d) file descriptors from systemd",
+ nfds);
+ nfds = 1;
+ }
+
+ unsetenv("LISTEN_PID");
+ unsetenv("LISTEN_FDS");
+
+ if (nfds == 0)
+ return 0;
+
+ /* Systemd passes FDs, starting immediately after stderr,
+ * so the first FD we'll get is '3'. */
+ if (!(svc = virNetServerServiceNewFD(3, 0, false, 1, NULL)))
+ return -1;
+
+ if (virNetServerAddService(srv, svc, NULL) < 0) {
+ virObjectUnref(svc);
+ return -1;
+ }
+ return 1;
+}
+
+
+static int
+virLockDaemonSetupNetworkingNative(virNetServerPtr srv, const char *sock_path)
{
virNetServerServicePtr svc;
@@ -728,6 +789,7 @@ int main(int argc, char **argv) {
mode_t old_umask;
bool privileged = false;
virLockDaemonConfigPtr config = NULL;
+ int rv;
struct option opts[] = {
{ "verbose", no_argument, &verbose, 1},
@@ -913,7 +975,14 @@ int main(int argc, char **argv) {
goto cleanup;
}
- if (virLockDaemonSetupNetworking(lockDaemon->srv, sock_file) < 0) {
+ if ((rv = virLockDaemonSetupNetworkingSystemD(lockDaemon->srv)) < 0) {
+ ret = VIR_LOCK_DAEMON_ERR_NETWORK;
+ goto cleanup;
+ }
+
+ /* Only do this, if systemd did not pass a FD */
+ if (rv == 0 &&
+ virLockDaemonSetupNetworkingNative(lockDaemon->srv, sock_file) < 0) {
ret = VIR_LOCK_DAEMON_ERR_NETWORK;
goto cleanup;
}
diff --git a/src/locking/virtlockd.service.in b/src/locking/virtlockd.service.in
new file mode 100644
index 0000000..a9f9f93
--- /dev/null
+++ b/src/locking/virtlockd.service.in
@@ -0,0 +1,13 @@
+[Unit]
+Description=Virtual machine lock manager
+Requires=virtlockd.socket
+After=syslog.target
+
+[Service]
+EnvironmentFile=-/etc/sysconfig/virtlockd
+ExecStart=@sbindir@/virtlockd
+ExecReload=/bin/kill -HUP $MAINPID
+# Loosing the locks is a really bad thing that will
+# cause the machine to be fenced (rebooted), so make
+# sure we discourage OOM killer
+OOMScoreAdjust=-900
diff --git a/src/locking/virtlockd.socket.in b/src/locking/virtlockd.socket.in
new file mode 100644
index 0000000..0589a29
--- /dev/null
+++ b/src/locking/virtlockd.socket.in
@@ -0,0 +1,8 @@
+[Unit]
+Description=Virtual machine lock manager socket
+
+[Socket]
+ListenStream=/var/run/libvirt/virtlockd/virtlockd.sock
+
+[Install]
+WantedBy=multi-user.target
--
1.7.11.7
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