On 29/08/2016 14:56, James Gritton wrote:
On 2016-08-29 02:52, Grzegorz Junka wrote:
On 28/08/2016 23:22, James Gritton wrote:
On 2016-08-28 15:42, Grzegorz Junka wrote:
I am trying to set up a Centos 6 jail. It fails with the following
error:
root@ultrabook:~ # service jail start centos6
Starting jails: centos6jls: jail "centos6" not found
.
I somehow managed to run it once by changing the start script from:
exec.start = "/bin/sh /etc/rc";
to
exec.start = "/etc/rc 3";
It started once but after I shut it down it shows the same error again
wherever I am trying to start it. This is what I have configured so
far:
root@ultrabook:~ # cat /etc/jail.conf
# Use the rc scripts to start and stop jails. Mount jail's /dev.
#exec.start = "/bin/sh /etc/rc";
#exec.stop = "/bin/sh /etc/rc.shutdown";
exec.clean;
allow.mount;
mount.devfs;
mount.fstab = "/usr/local/etc/fstab/$name";
devfs_ruleset = 4;
path = "/j/$name";
host.hostname = "$name.ultrabook.yoonka.com";
exec.consolelog = "/var/log/jail/$name";
centos6 {
exec.start = "/etc/rc 3";
ip4.addr = 127.0.2.1;
interface = lo0;
}
root@ultrabook:~ # cat /usr/local/etc/fstab/centos6
linsys /j/centos6/sys linsysfs rw 0 0
linproc /j/centos6/proc linprocfs rw 0 0
#tmpfs /j/centos6/lib/init/rw tmpfs rw,mode=777 0 0
/devfs /j/centos6/dev devfs rw,ruleset=4 0 0
I was following this example:
https://bluehatrecord.wordpress.com/2015/09/19/the-midnight-oil-jailing-centos6-in-freebsd-10-2/
but wanted to use the new configuration files. My system:
root@ultrabook:~ # uname -a
FreeBSD ultrabook.yoonka.com 10.3-RELEASE FreeBSD 10.3-RELEASE #0
r297264: Fri Mar 25 02:10:02 UTC 2016
r...@releng1.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC amd64
How to fix or debug this 'jail "centos6" not found' error and start
the jail?
Grzegorz
I wonder if the jail exists as dying - does it show up in "jls -d"?
Also, for a verbose start, try "jail -v -c centos6". That shows
commands that are run when creating the jail, and may pinpoint where
the trouble is.
- Jamie
No, 'jls -d' doesn't show anything but every time I try to start the
jail new mounts from the jail's fstab are made, e.g. just after
starting FreeBSD:
linsysfs on /j/centos6/sys (linsysfs, local)
linprocfs on /j/centos6/proc (linprocfs, local)
devfs on /j/centos6/dev (devfs, local, multilabel)
devfs on /j/centos6/dev (devfs, local, multilabel)
Then after trying to start the jail again:
linsysfs on /j/centos6/sys (linsysfs, local)
linprocfs on /j/centos6/proc (linprocfs, local)
devfs on /j/centos6/dev (devfs, local, multilabel)
devfs on /j/centos6/dev (devfs, local, multilabel)
linsysfs on /j/centos6/sys (linsysfs, local)
linprocfs on /j/centos6/proc (linprocfs, local)
devfs on /j/centos6/dev (devfs, local, multilabel)
devfs on /j/centos6/dev (devfs, local, multilabel)
After unmounting all those and trying again:
root@ultrabook:/home/g # jail -v -c centos6
centos6: run command: /sbin/ifconfig lo0 inet 127.0.2.1 netmask
255.255.255.255 alias
centos6: run command: /sbin/mount -t linsysfs -o rw linsys
/j/centos6/sys
centos6: run command: /sbin/mount -t linprocfs -o rw linproc
/j/centos6/proc
centos6: run command: /sbin/mount -t devfs -oruleset=4 . /j/centos6/dev
centos6: jail_set(JAIL_CREATE) persist name=centos6 allow.mount
devfs_ruleset=4 path=/j/centos6
host.hostname=centos6.ultrabook.yoonka.com ip4.addr=127.0.2.1
centos6: created
centos6: run command in jail: /etc/rc 3
centos6: jail_set(JAIL_UPDATE) jid=3 nopersist
root@ultrabook:/home/g # jls
JID IP Address Hostname Path
root@ultrabook:/home/g # jls -d
JID IP Address Hostname Path
Grzegorz
That all looks good from the jail(8) side of things. By "good" I mean
it's doing what it's expected to do. The jail is created as it should
be, the start command ("/etc/rc 3") is run with no errors, and the
jail is still there when the temporary persist flag is removed.
It's probably that last step that makes the jail go away. jail(8)
initially creates jails with the persist flag set, so it can be sure
the jail is still there for later operations. Unless the flag is
mentioned in the config though, it clears it after everything else is
done. The idea is that once the start commands have been run, there
will be some process still running in the jail to keep it around. I'm
guessing that in your case there isn't one. That may be by design
(you don't have any daemons you want to run, not generally the case)
or by error. The next place to look is in the jail's console log,
which will have the output from that /etc/rc run.
You can make the jail stick around by adding "persist" to the
jail.conf entry. But chances are, you still need to find why the
startup commands aren't doing what you want.
- Jamie
Thank you for the tip. It looks like the image was a simple version
starting only sshd, which actually wasn't starting because of some
error. So there was no daemon to run in the jail. Adding the persist
configuration option to the jail configuration allowed it to stay running.
Grzegorz
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