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Add documentation about running postmasters in FreeBSD jails (use

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separate users).
This commit is contained in:
Bruce Momjian 2006-04-11 19:26:42 +00:00
parent fac2ba5da3
commit ba60acf17e
1 changed files with 13 additions and 1 deletions
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14
doc/src/sgml/runtime.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.366 2006/04/03 23:35:02 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.367 2006/04/11 19:26:42 momjian Exp $ -->
<chapter Id="runtime">
<title>Operating System Environment</title>
@ -763,6 +763,18 @@ 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">