From: Bruce Momjian <bruce@momjian.us>
Date: Tue, 11 Apr 2006 19:28:03 +0000 (+0000)
Subject: Add documentation about running postmasters in FreeBSD jails (use
X-Git-Url: http://waps.l3s.uni-hannover.de/gitweb/?a=commitdiff_plain;h=cdc4c9a7ceda9b917230831066b4769f2ed5f720;p=users%2Fbernd%2Fpostgres.git

Add documentation about running postmasters in FreeBSD jails (use
separate users).
---

diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 1af5032f29..2130bb4639 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -766,6 +766,18 @@ options "SEMMNS=240"
         setting <literal>kern.ipc.shm_use_phys</literal>.
        </para>
 
+       <para>
+        If running in FreeBSD jails by enabling <application>sysconf</>'s
+        <literal>security.jail.sysvipc_allowed</>, <application>postmaster</>s
+        running in different jails should be run by different operating system
+        users.  This improves security because it prevents one jail from
+        interfering with shared memory or semaphores in another, and it
+        allows the PostgreSQL IPC cleanup code to function properly.  
+        (In FreeBSD 6.0 and later the IPC cleanup code doesn't properly detect
+        processes in other jails, preventing the running of postmasters on the
+        same port in different jails.)
+       </para>
+
        <para>
         <systemitem class="osname">FreeBSD</> versions before 4.0 work like 
         <systemitem class="osname">NetBSD</> and <systemitem class="osname">