diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 09e6dfc..2426dfe 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -695,6 +695,23 @@ include 'filename'
       </listitem>
      </varlistentry>

+     <varlistentry id="guc-cluster-name" xreflabel="cluster_name">
+      <term><varname>cluster_name</varname> (<type>string</type>)</term>
+      <indexterm>
+       <primary><varname>cluster_name</> configuration parameter</primary>
+      </indexterm>
+      <listitem>
+       <para>
+        Sets the cluster name that appears in the process title for all
+        processes in this cluster.  No name is shown if this parameter is set
+        to the empty string <literal>''</> (which is the default).  The
+        process title is typically viewed by the <command>ps</> command, or in
+        Windows by using the <application>Process Explorer</>.
+        This parameter can only be set at server start.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-tcp-keepalives-idle" xreflabel="tcp_keepalives_idle">
       <term><varname>tcp_keepalives_idle</varname> (<type>integer</type>)
       <indexterm>
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 6902c23..c9dbb4c 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -443,6 +443,7 @@ int			temp_file_limit = -1;

 int			num_temp_buffers = 1024;

+const char *cluster_name = "";
 char	   *data_directory;
 char	   *ConfigFileName;
 char	   *HbaFileName;
@@ -3090,6 +3091,17 @@ static struct config_string ConfigureNamesString[] =
 	},

 	{
+		{"cluster_name", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
+			gettext_noop("Sets the name of the cluster that appears in 'ps' output."),
+			NULL,
+			GUC_IS_NAME
+		},
+		&cluster_name,
+		"",
+		NULL, NULL, NULL
+	},
+
+	{
 		/*
 		 * Can't be set by ALTER SYSTEM as it can lead to recursive definition
 		 * of data_directory.
diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample
index d109394..e4e0411 100644
--- a/src/backend/utils/misc/postgresql.conf.sample
+++ b/src/backend/utils/misc/postgresql.conf.sample
@@ -74,6 +74,8 @@
 					# (change requires restart)
 #bonjour_name = ''			# defaults to the computer name
 					# (change requires restart)
+#cluster_name = ''			# visible in ps output if set
+					# (change requires restart)

 # - Security and Authentication -

diff --git a/src/backend/utils/misc/ps_status.c b/src/backend/utils/misc/ps_status.c
index 3aeceae..471d890 100644
--- a/src/backend/utils/misc/ps_status.c
+++ b/src/backend/utils/misc/ps_status.c
@@ -29,6 +29,7 @@
 #include "libpq/libpq.h"
 #include "miscadmin.h"
 #include "utils/ps_status.h"
+#include "utils/guc.h"

 extern char **environ;
 bool		update_process_title = true;
@@ -264,15 +265,24 @@ init_ps_display(const char *username, const char *dbname,
 	 * apparently setproctitle() already adds a `progname:' prefix to the ps
 	 * line
 	 */
-	snprintf(ps_buffer, ps_buffer_size,
-			 "%s %s %s ",
-			 username, dbname, host_info);
+#define PROGRAM_NAME_PREFIX ""
 #else
-	snprintf(ps_buffer, ps_buffer_size,
-			 "postgres: %s %s %s ",
-			 username, dbname, host_info);
+#define PROGRAM_NAME_PREFIX "postgres: "
 #endif

+	if (*cluster_name == '\0')
+	{
+		snprintf(ps_buffer, ps_buffer_size,
+				 PROGRAM_NAME_PREFIX "%s %s %s ",
+				 username, dbname, host_info);
+	}
+	else
+	{
+		snprintf(ps_buffer, ps_buffer_size,
+				 PROGRAM_NAME_PREFIX "%s %s %s %s ",
+				 cluster_name, username, dbname, host_info);
+	}
+
 	ps_buffer_cur_len = ps_buffer_fixed_size = strlen(ps_buffer);

 	set_ps_display(initial_str, true);
diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1493d2c..d3cdf68 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -224,6 +224,7 @@ extern int	temp_file_limit;

 extern int	num_temp_buffers;

+extern const char *cluster_name;
 extern char *data_directory;
 extern char *ConfigFileName;
 extern char *HbaFileName;