jail not found error?

[Grzegorz Junka]

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 at 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 at 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 at 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 at ultrabook:~ # uname -a
>> FreeBSD ultrabook.yoonka.com 10.3-RELEASE FreeBSD 10.3-RELEASE #0
>> r297264: Fri Mar 25 02:10:02 UTC 2016
>> root at 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 at 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 at ultrabook:/home/g # jls
    JID  IP Address      Hostname                      Path
root at ultrabook:/home/g # jls -d
    JID  IP Address      Hostname                      Path

Grzegorz