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Attachment #34714
gentoo-vserver-baselayout.html	text/html	2004-07-03 08:41:10 UTC	7.63 KB	no flags	Details

<HTML>
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  <TITLE>GentooVserverBaselayout</TITLE>
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<div class="content">
Attempt to modify Gentoo-baselayout to make vserver-deployment easier without
breaking the current behaviour and without needing to split the baselayout.
<P>
The modifications outlined below were tested with sys-apps/baselayout-1.9.4-r2
on a vserver-enabled system without trouble; further testing is needed as
failures in baselayout may render the system unbootable.
<P>
sources of information:
<UL CLASS="square">
<LI><A HREF="http://vserver.strahlungsfrei.de/tiki-index.php?page=VServerGentooNew">http://vserver.strahlungsfrei.de/tiki-index.php?page=VServerGentooNew</A>
<LI><A HREF="http://www.linux-vserver.org">http://www.linux-vserver.org</A>
</UL CLASS="square">

<P>
related Gentoo-packages:
<UL CLASS="square">
<LI>sys-kernel/vserver-sources
<LI>sys-cluster/util-vserver
</UL CLASS="square">

<P>
<H4>helper-functions and modification of /sbin/rc and /etc/inittab</H4>
<P>
<UL CLASS="square">
<LI>helper-functions we use:
<PRE CLASS="code">instserv sbin # cat /sbin/vserver-functions.sh
#!/bin/bash
##
## basic function-set for integration in gentoo-baselayout -- this
## should allow save (re-)booting of vservers and root-servers without
## maintaining 2 completely different baselayouts.
## Idea: we simply check if we are on a root- or v-server and react accordingly.
## If there is no "s_context:" at all we have a vanilla (i.e. non-vserver) system
## that is treated like a root-server.

check_context() {
        ## TODO: error-handling? what to do if /proc/$$/status does not exist?
        awk '/^s_context:/ { print $2; }' /proc/$$/status
}

on_rootserver() {
        local ctx=$(check_context)

        if [ "x${ctx}" = "x0" -o "x${ctx}" = "x" ]; then
                ## we are on the root-server or a non-vserver-system:
                return 0
        else
                return 1
        fi
}

on_vserver() {
        on_rootserver &amp;&amp; return 1 || return 0
}
</PRE>
<P>
<LI>modify /sbin/rc to perform a depscan (the "fake-init"-stuff prevents
     /sbin/rc to do it as the runlevel is never "S"!?):
<PRE CLASS="code">instserv sbin # diff -u rc.org  rc
--- rc.org      2004-06-13 13:32:17.000000000 +0200
+++ rc  2004-07-03 15:40:42.000000000 +0200
@@ -10,6 +10,10 @@
 [ -f /sbin/livecd-functions.sh ] &amp;&amp; source /sbin/livecd-functions.sh
 umask 022

+## vserver-support:
+[ -f /sbin/vserver-functions.sh ] &amp;&amp; source /sbin/vserver-functions.sh
+on_vserver &amp;&amp; /sbin/depscan.sh
+
 try() {
        local errstr
        local retval=0
</PRE>
<P>
<LI>create two new runlevel-directories and adjust /etc/inittab: <BR>
     [ "vdefault" may be omitted, see "Plan B" below ]
<PRE CLASS="code">mkdir /etc/runlevels/{vboot,vdefault}
instserv runlevels # diff -u /etc/inittab.org /etc/inittab
--- /etc/inittab.org    2004-06-13 13:32:17.000000000 +0200
+++ /etc/inittab        2004-07-03 15:49:16.000000000 +0200
@@ -17,14 +17,14 @@
 si::sysinit:/sbin/rc sysinit

 # Further system initialization, brings up the boot runlevel.
-rc::bootwait:/sbin/rc boot
+rc::bootwait:/sbin/rc vboot

 l0:0:wait:/sbin/rc shutdown
 l1:S1:wait:/sbin/rc single
 l2:2:wait:/sbin/rc nonetwork
-l3:3:wait:/sbin/rc default
-l4:4:wait:/sbin/rc default
-l5:5:wait:/sbin/rc default
+l3:3:wait:/sbin/rc vdefault
+l4:4:wait:/sbin/rc vdefault
+l5:5:wait:/sbin/rc vdefault
 l6:6:wait:/sbin/rc reboot
 #z6:6:respawn:/sbin/sulogin

</PRE>
<P>
   =&gt; nothing is started up by defaut, to add a service use, e.g.
<PRE CLASS="code">rc-update add sshd vdefault
</PRE>
   =&gt; this does not work as the values in /etc/inittab are not used; they are
   overridden by the "vserver"-tool from "sys-cluster/util-vserver" so that
   always "default" is choosen.
<P>
   <B>Plan B:</B>
<PRE CLASS="code">cd /etc/runlevels; mv default default.org; ln -s vdefault default
</PRE>
   We might as well de-populate the original default-runlevel with "rc-update"
   and omitt the whole "vdefault"-stuff above.
<P>
<LI>prepare a configfile for your vserver on your root-server
     (/etc/vservers/my_vserver.conf).
</UL CLASS="square">

<P>
<H4>modify initscripts</H4>
<P>
We need to <B>modify some initscripts</B> as some operations are not possible
within a vserver and the dependency-tracking of the Gentoo-initsystem is more
than unhappy with failing services (which is the perfectly correct behaviour).
<P>
A vserver "inherits" some of the root-server setup or get's configured from
the root-server. This is the case for, e.g. hardware-clock and
network-configuration.
<P>
List of initscripts that we need to make vserver-aware:
<PRE CLASS="code">hostname
modules
checkfs
localmount
clock
consolefont
serial
net.eth0
net.lo
</PRE>
<P>
We use the same trick as in <CODE>/sbin/rc</CODE>, each initscript gets the following
lines added at the top (directly after the copyright-header):
<PRE CLASS="code">## vserver-support:
[ -f /sbin/vserver-functions.sh ] &amp;&amp; source /sbin/vserver-functions.sh
on_vserver &amp;&amp; exit 0
</PRE>
(if this get's integrated in the offical baselayout the sourcing of
vserver-functions.sh will happen at a more central place and not in every
initscript)
<P>
<H4>reboot and halt</H4>
<P>
In order to enable reboot and halt for a vserver <CODE>rebootmgr</CODE> needs to be
running on the root-server and <CODE>/sbin/halt</CODE> on the vserver needs to be
replaced by <CODE>vreboot</CODE> from sys-cluster/util-vserver. (what about
<CODE>/etc/init.d/shutdown.sh</CODE>?)
<P>
Simply overwriting it is not a good solution as the next baselayout-update
will revert to the "wrong" (non-vserver) version. <BR>
If we only modify <CODE>/etc/init.d/halt.sh</CODE> and <CODE>/etc/init.d/reboot.sh</CODE> like
<PRE CLASS="code">sed -i -e "s@/sbin/halt@/sbin/vhalt@g;" /etc/init.d/halt.sh
	:
	:
</PRE>
<P>
it is still possible to type <CODE>reboot</CODE> on the shell-prompt and loose contact
with your vserver.
<P>
=&gt; we need to decide what way to go here (maybe a vserver-USE-flag for
baselayout could be introduced?).
</div>
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Attachment #50533
rc-scripts-1.6.9-vserver.diff	patch	2005-02-06 05:50:41 UTC	6.57 KB	no flags	Details

Attachment #50964
xdm.initd.patch for vserver-guests	patch	2005-02-10 16:51:06 UTC	827 bytes	no flags	Details