Jamie Gritton wrote:
[...]
Hi Jamie,
I tried your suggestion with exec_poststart for setting the cpuset.
It doesn't work. I don't know if it worked for you with any older
version of FreeBSD. I tried it on FreeBSD 9.1-RELESE.
I have this in rc.conf
jail_fox_exec_poststart0="cpuset -c -l 5-6 -j `cat /var/run/jail_fox.id`"
With rc_debug="YES", I get this error
# service jail start fox
cat: /var/run/jail_fox.id: No such file or directory
cat: /var/run/jail_fox.id: No such file or directory
[snip]
/etc/rc.d/jail: DEBUG: fox exec post-start #1: cpuset -c -l 5-6 -j
[snip]
fox.example.comcpuset: option requires an argument -- j
usage: cpuset [-l cpu-list] [-s setid] cmd ...
cpuset [-l cpu-list] [-s setid] -p pid
cpuset [-c] [-l cpu-list] -C -p pid
cpuset [-cr] [-l cpu-list] [-j jailid | -p pid | -t tid | -s
setid | -x irq]
cpuset [-cgir] [-j jailid | -p pid | -t tid | -s setid | -x irq]
I think the problem is, that the command is evaluated befor the jail is
started.
Or am I doing something wrong?
I also tried following with no luck:
jail_fox_exec_poststart0="cpuset -c -l 5-6 -j `jls -j fox jid`"
I'm not seeing /var/run/jail_*.id either, despite it being mentioned in
/etc/rc.d/jail. The jls one works for me, but then I'm running current
so maybe that's the difference.
I made a diff between rc.d/jail from HEAD, 8.4-RELEASE and 9.1-RELEASE
and there is no changes in code for _exec_poststart.
I don't know how it is possible, that it works for you and doesn't for
for me.
If I interpret it correctly, the following code in the begining of
init_variables() does the eval on the command and backticks are executed
at this time - before the jail is started.
Am I wrong?
i=0
while : ; do
eval
_exec_poststart${i}=\"\${jail_${_j}_exec_poststart${i}:-\${jail_exec_poststart${i}}}\"
[ -z "$(eval echo \"\$_exec_poststart${i}\")" ] && break
i=$((i + 1))
done
Then there is code for debug printing only
i=0
while : ; do
eval out=\"\${_exec_poststart${i}:-''}\"
if [ -z "$out" ]; then
break
fi
debug "$_j exec post-start #${i}: ${out}"
i=$((i + 1))
done
And in jail_start() there is jail command executions followed by
execution of poststart commands, but at this time, the command is
"cpuset -c -l 5-6 -j" and not "cpuset -c -l 5-6 -j `jls -j fox jid`"
eval ${_setfib} jail ${_flags} -i ${_rootdir} ${_hostname} \
\"${_addrl}\" ${_exec_start} > ${_tmp_jail} 2>&1 \
</dev/null
i=0
while : ; do
eval out=\"\${_exec_poststart${i}:-''}\"
[ -z "$out" ] && break
${out}
i=$((i + 1))
done
So how can it works for you? Is there any changes in "sh" with eval and
backticks evaluation in HEAD?
> If all else fails, you can hardcode the
> jail number - that'll work as long as you only ever let the jails load
> on startup.
Unluckily I need to restart some jails manually, so I think I cannot use
hardcoded JID numbers :(
Thank you for your reply.
Miroslav Lachman
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