Date: Sun, 11 Jan 2009 18:40:56 +0000 (UTC) From: "Bjoern A. Zeeb" <bz@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r187059 - head/usr.sbin/jail Message-ID: <200901111840.n0BIeuG6035547@svn.freebsd.org>
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Author: bz Date: Sun Jan 11 18:40:56 2009 New Revision: 187059 URL: http://svn.freebsd.org/changeset/base/187059 Log: Add a short section talking about jails and file systems; mention the mountand jail-aware file systems as well as quota. PR: kern/68192 Reviewed by: simon MFC after: 2 weeks Modified: head/usr.sbin/jail/jail.8 Modified: head/usr.sbin/jail/jail.8 ============================================================================== --- head/usr.sbin/jail/jail.8 Sun Jan 11 17:11:01 2009 (r187058) +++ head/usr.sbin/jail/jail.8 Sun Jan 11 18:40:56 2009 (r187059) @@ -33,7 +33,7 @@ .\" .\" $FreeBSD$ .\" -.Dd November 29, 2008 +.Dd January 11, 2009 .Dt JAIL 8 .Os .Sh NAME @@ -480,6 +480,29 @@ pkill -j 3 or: .Pp .Dl "killall -j 3" +.Ss "Jails and File Systems" +It is not possible to +.Xr mount 8 +or +.Xr unmount 8 +any file system inside a jail unless the file system is marked +jail-friendly. +See +.Va security.jail.mount_allowed +in the +.Va "Sysctl MIB Entries" +section. +.Pp +Multiple jails sharing the same file system can influence each other. +For example a user in one jail can fill the file system also +leaving no space for processes in the other jail. +Trying to use +.Xr quota 1 +to prevent this will not work either as the file system quotas +are not aware of jails but only look at the user and group IDs. +This means the same user ID in two jails share the same file +system quota. +One would need to use one file system per jail to make this working. .Ss "Sysctl MIB Entries" Certain aspects of the jail containments environment may be modified from the host environment using @@ -614,6 +637,7 @@ and .Xr pgrep 1 , .Xr pkill 1 , .Xr ps 1 , +.Xr quota 1 , .Xr chroot 2 , .Xr jail 2 , .Xr jail_attach 2 , @@ -626,6 +650,7 @@ and .Xr jexec 8 , .Xr jls 8 , .Xr mount 8 , +.Xr unmount 8 , .Xr named 8 , .Xr reboot 8 , .Xr rpcbind 8 ,
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