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Commit7d17e68

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Add support for systemd service notifications
Insert sd_notify() calls at server start and stop for integration withsystemd. This allows the use of systemd service units of type "notify",which greatly simplifies the systemd configuration.Reviewed-by: Pavel Stěhule <pavel.stehule@gmail.com>
1 parentac7238d commit7d17e68

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8 files changed

+147
-0
lines changed

8 files changed

+147
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lines changed

‎configure

Lines changed: 49 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -709,6 +709,7 @@ with_libxml
709709
XML2_CONFIG
710710
UUID_EXTRA_OBJS
711711
with_uuid
712+
with_systemd
712713
with_selinux
713714
with_openssl
714715
krb_srvtab
@@ -830,6 +831,7 @@ with_ldap
830831
with_bonjour
831832
with_openssl
832833
with_selinux
834+
with_systemd
833835
with_readline
834836
with_libedit_preferred
835837
with_uuid
@@ -1518,6 +1520,7 @@ Optional Packages:
15181520
--with-bonjour build with Bonjour support
15191521
--with-openssl build with OpenSSL support
15201522
--with-selinux build with SELinux support
1523+
--with-systemd build with systemd support
15211524
--without-readline do not use GNU Readline nor BSD Libedit for editing
15221525
--with-libedit-preferred
15231526
prefer BSD Libedit over GNU Readline
@@ -5694,6 +5697,41 @@ fi
56945697
{$as_echo"$as_me:${as_lineno-$LINENO}: result:$with_selinux">&5
56955698
$as_echo"$with_selinux">&6; }
56965699

5700+
#
5701+
# Systemd
5702+
#
5703+
{$as_echo"$as_me:${as_lineno-$LINENO}: checking whether to build with systemd support">&5
5704+
$as_echo_n"checking whether to build with systemd support...">&6; }
5705+
5706+
5707+
5708+
# Check whether --with-systemd was given.
5709+
iftest"${with_systemd+set}" =set;then:
5710+
withval=$with_systemd;
5711+
case$withvalin
5712+
yes)
5713+
5714+
$as_echo"#define USE_SYSTEMD 1">>confdefs.h
5715+
5716+
;;
5717+
no)
5718+
:
5719+
;;
5720+
*)
5721+
as_fn_error$?"no argument expected for --with-systemd option""$LINENO" 5
5722+
;;
5723+
esac
5724+
5725+
else
5726+
with_systemd=no
5727+
5728+
fi
5729+
5730+
5731+
5732+
{$as_echo"$as_me:${as_lineno-$LINENO}: result:$with_systemd">&5
5733+
$as_echo"$with_systemd">&6; }
5734+
56975735
#
56985736
# Readline
56995737
#
@@ -10473,6 +10511,17 @@ fi
1047310511

1047410512
done
1047510513

10514+
fi
10515+
10516+
iftest"$with_systemd" = yes;then
10517+
ac_fn_c_check_header_mongrel"$LINENO""systemd/sd-daemon.h""ac_cv_header_systemd_sd_daemon_h""$ac_includes_default"
10518+
iftest"x$ac_cv_header_systemd_sd_daemon_h" = xyes;then:
10519+
10520+
else
10521+
as_fn_error$?"header file <systemd/sd-daemon.h> is required for systemd support""$LINENO" 5
10522+
fi
10523+
10524+
1047610525
fi
1047710526

1047810527
iftest"$with_libxml" = yes;then

‎configure.in

Lines changed: 13 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -699,6 +699,15 @@ PGAC_ARG_BOOL(with, selinux, no, [build with SELinux support])
699699
AC_SUBST(with_selinux)
700700
AC_MSG_RESULT([$with_selinux])
701701

702+
#
703+
# Systemd
704+
#
705+
AC_MSG_CHECKING([whether to build with systemd support])
706+
PGAC_ARG_BOOL(with, systemd, no, [build with systemd support],
707+
[AC_DEFINE([USE_SYSTEMD], 1, [Define to build with systemd support. (--with-systemd)])])
708+
AC_SUBST(with_systemd)
709+
AC_MSG_RESULT([$with_systemd])
710+
702711
#
703712
# Readline
704713
#
@@ -1249,6 +1258,10 @@ if test "$with_pam" = yes ; then
12491258
[AC_MSG_ERROR([header file <security/pam_appl.h> or <pam/pam_appl.h> is required for PAM.])])])
12501259
fi
12511260

1261+
if test "$with_systemd" = yes ; then
1262+
AC_CHECK_HEADER(systemd/sd-daemon.h, [], [AC_MSG_ERROR([header file <systemd/sd-daemon.h> is required for systemd support])])
1263+
fi
1264+
12521265
if test "$with_libxml" = yes ; then
12531266
AC_CHECK_HEADER(libxml/parser.h, [], [AC_MSG_ERROR([header file <libxml/parser.h> is required for XML support])])
12541267
fi

‎doc/src/sgml/installation.sgml

Lines changed: 16 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -812,6 +812,22 @@ su - postgres
812812
</listitem>
813813
</varlistentry>
814814

815+
<varlistentry>
816+
<term><option>--with-systemd</option></term>
817+
<listitem>
818+
<para>
819+
Build with support
820+
for <application>systemd</application><indexterm><primary>systemd</primary></indexterm>
821+
service notifications. This improves integration if the server binary
822+
is started under <application>systemd</application> but has no impact
823+
otherwise; see <xref linkend="server-start"> for more
824+
information. <application>libsystemd</application> and the
825+
associated header files need to be installed to be able to use this
826+
option.
827+
</para>
828+
</listitem>
829+
</varlistentry>
830+
815831
<varlistentry>
816832
<term><option>--without-readline</option></term>
817833
<listitem>

‎doc/src/sgml/runtime.sgml

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Original file line numberDiff line numberDiff line change
@@ -369,6 +369,41 @@ fi
369369
<filename>contrib/start-scripts/linux</filename> in the
370370
<productname>PostgreSQL</productname> source distribution.
371371
</para>
372+
373+
<para>
374+
When using <application>systemd</application>, you can use the following
375+
service unit file (e.g.,
376+
at <filename>/etc/systemd/system/postgresql.service</filename>):<indexterm><primary>systemd</primary></indexterm>
377+
<programlisting>
378+
[Unit]
379+
Description=PostgreSQL database server
380+
Documentation=man:postgres(1)
381+
382+
[Service]
383+
Type=notify
384+
User=postgres
385+
ExecStart=/usr/local/pgsql/bin/postgres -D /usr/local/pgsql/data
386+
ExecReload=/bin/kill -HUP $MAINPID
387+
KillMode=mixed
388+
KillSignal=SIGINT
389+
TimeoutSec=0
390+
391+
[Install]
392+
WantedBy=multi-user.target
393+
</programlisting>
394+
Using <literal>Type=notify</literal> requires that the server binary was
395+
built with <literal>configure --with-systemd</literal>.
396+
</para>
397+
398+
<para>
399+
Consider carefully the timeout
400+
setting. <application>systemd</application> has a default timeout of 90
401+
seconds as of this writing and will kill a process that does not notify
402+
readiness within that time. But a <productname>PostgreSQL</productname>
403+
server that might have to perform crash recovery at startup could take
404+
much longer to become ready. The suggested value of 0 disables the
405+
timeout logic.
406+
</para>
372407
</listitem>
373408

374409
<listitem>

‎src/Makefile.global.in

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -184,6 +184,7 @@ with_python= @with_python@
184184
with_tcl= @with_tcl@
185185
with_openssl= @with_openssl@
186186
with_selinux= @with_selinux@
187+
with_systemd= @with_systemd@
187188
with_libxml= @with_libxml@
188189
with_libxslt= @with_libxslt@
189190
with_system_tzdata = @with_system_tzdata@

‎src/backend/Makefile

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -45,6 +45,10 @@ LIBS := $(filter-out -lpgport -lpgcommon, $(LIBS)) $(LDAP_LIBS_BE)
4545
# The backend doesn't need everything that's in LIBS, however
4646
LIBS :=$(filter-out -lz -lreadline -ledit -ltermcap -lncurses -lcurses,$(LIBS))
4747

48+
ifeq ($(with_systemd),yes)
49+
LIBS += -lsystemd
50+
endif
51+
4852
##########################################################################
4953

5054
all: submake-libpgport submake-schemapg postgres$(POSTGRES_IMP)

‎src/backend/postmaster/postmaster.c

Lines changed: 26 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -87,6 +87,10 @@
8787
#include<dns_sd.h>
8888
#endif
8989

90+
#ifdefUSE_SYSTEMD
91+
#include<systemd/sd-daemon.h>
92+
#endif
93+
9094
#ifdefHAVE_PTHREAD_IS_THREADED_NP
9195
#include<pthread.h>
9296
#endif
@@ -2533,6 +2537,9 @@ pmdie(SIGNAL_ARGS)
25332537
Shutdown=SmartShutdown;
25342538
ereport(LOG,
25352539
(errmsg("received smart shutdown request")));
2540+
#ifdefUSE_SYSTEMD
2541+
sd_notify(0,"STOPPING=1");
2542+
#endif
25362543

25372544
if (pmState==PM_RUN||pmState==PM_RECOVERY||
25382545
pmState==PM_HOT_STANDBY||pmState==PM_STARTUP)
@@ -2585,6 +2592,9 @@ pmdie(SIGNAL_ARGS)
25852592
Shutdown=FastShutdown;
25862593
ereport(LOG,
25872594
(errmsg("received fast shutdown request")));
2595+
#ifdefUSE_SYSTEMD
2596+
sd_notify(0,"STOPPING=1");
2597+
#endif
25882598

25892599
if (StartupPID!=0)
25902600
signal_child(StartupPID,SIGTERM);
@@ -2645,6 +2655,9 @@ pmdie(SIGNAL_ARGS)
26452655
Shutdown=ImmediateShutdown;
26462656
ereport(LOG,
26472657
(errmsg("received immediate shutdown request")));
2658+
#ifdefUSE_SYSTEMD
2659+
sd_notify(0,"STOPPING=1");
2660+
#endif
26482661

26492662
TerminateChildren(SIGQUIT);
26502663
pmState=PM_WAIT_BACKENDS;
@@ -2787,6 +2800,10 @@ reaper(SIGNAL_ARGS)
27872800
ereport(LOG,
27882801
(errmsg("database system is ready to accept connections")));
27892802

2803+
#ifdefUSE_SYSTEMD
2804+
sd_notify(0,"READY=1");
2805+
#endif
2806+
27902807
continue;
27912808
}
27922809

@@ -4916,6 +4933,11 @@ sigusr1_handler(SIGNAL_ARGS)
49164933
if (XLogArchivingAlways())
49174934
PgArchPID=pgarch_start();
49184935

4936+
#ifdefUSE_SYSTEMD
4937+
if (!EnableHotStandby)
4938+
sd_notify(0,"READY=1");
4939+
#endif
4940+
49194941
pmState=PM_RECOVERY;
49204942
}
49214943
if (CheckPostmasterSignal(PMSIGNAL_BEGIN_HOT_STANDBY)&&
@@ -4930,6 +4952,10 @@ sigusr1_handler(SIGNAL_ARGS)
49304952
ereport(LOG,
49314953
(errmsg("database system is ready to accept read only connections")));
49324954

4955+
#ifdefUSE_SYSTEMD
4956+
sd_notify(0,"READY=1");
4957+
#endif
4958+
49334959
pmState=PM_HOT_STANDBY;
49344960
/* Some workers may be scheduled to start now */
49354961
StartWorkerNeeded= true;

‎src/include/pg_config.h.in

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -833,6 +833,9 @@
833833
/* Define to 1 to use Intel SSSE 4.2 CRC instructions with a runtime check. */
834834
#undef USE_SSE42_CRC32C_WITH_RUNTIME_CHECK
835835

836+
/* Define to build with systemd support. (--with-systemd) */
837+
#undef USE_SYSTEMD
838+
836839
/* Define to select SysV-style semaphores. */
837840
#undef USE_SYSV_SEMAPHORES
838841

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