Date: Mon, 31 Oct 2016 17:03:45 +0000 From: io7m+org.freebsd.jail@mail.io7m.com To: freebsd-jail@freebsd.org Subject: Jail fails to unmount a directory Message-ID: <20161031170345.6f2f88e6@copperhead.int.arc7.info>
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Hello.
I have an incredibly trivial jail setup:
/usr/jail/com.example.service0 is the root of the jail.
/usr/jail/com.example.service0/base is an empty directory.
/usr/jail/base is a directory containing binaries.
I use the following jail configuration:
com_example_service0
{
exec.start = "/bin/sh";
host.hostname = com.example.service0;
interface = em0;
ip4.addr = 127.0.0.2;
mount.fstab = /usr/jail/com.example.service0.fstab;
path = /usr/jail/com.example.service0;
}
The /usr/jail/com.example.service0.fstab contains a single line:
/usr/jail/base /usr/jail/com.example.service0/base nullfs ro,noauto 0 0
I start the jail:
host# jail -v -f com.example.service0.conf -c com_example_service0
com_example_service0: run command: /sbin/ifconfig em0 inet 127.0.0.2 netmask 255.255.255.255 alias
com_example_service0: run command: /sbin/mount -t nullfs -o ro,noauto /usr/jail/base /usr/jail/com.example.service0/base
com_example_service0: jail_set(JAIL_CREATE) persist name=com_example_service0 host.hostname=com.example.service0 ip4.addr=127.0.0.2 path=/usr/jail/com.example.service0
com_example_service0: created
com_example_service0: run command in jail: /bin/sh
# exit
com_example_service0: jail_set(JAIL_UPDATE) jid=13 nopersist
host#
The jail is gone:
host# jls
JID IP Address Hostname Path
However:
host# df -h | grep service0
# df -h
Filesystem Size Used Avail Capacity Mounted on
zroot/ROOT/default 13G 475M 13G 4% /
devfs 1.0K 1.0K 0B 100% /dev
zroot/tmp 13G 108K 13G 0% /tmp
zroot/usr/home 13G 136K 13G 0% /usr/home
zroot/usr/ports 13G 96K 13G 0% /usr/ports
zroot/usr/src 13G 96K 13G 0% /usr/src
zroot/var/audit 13G 96K 13G 0% /var/audit
zroot/var/crash 13G 96K 13G 0% /var/crash
zroot/var/log 13G 148K 13G 0% /var/log
zroot/var/mail 13G 96K 13G 0% /var/mail
zroot/var/tmp 13G 96K 13G 0% /var/tmp
zroot 13G 96K 13G 0% /zroot
zroot/jail 13G 249M 13G 2% /usr/jail
zroot/jail/com.example.service0 13G 4.0M 13G 0% /usr/jail/com.example.service0
/usr/jail/base 13G 249M 13G 2% /usr/jail/com.example.service0/base
.. the /usr/jail/com.example.service0/base directory was not unmounted.
What do I need to do to get the directory to be correctly unmounted
when the jail ceases to exist?
M
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