Date: Sun, 12 Dec 2021 18:44:09 -0500 (EST) From: Doug Denault <doug@safeport.com> To: freebsd-questions@FreeBSD.ORG Subject: one down - was a couple of iocage questions Message-ID: <alpine.BSF.2.00.2112121707140.4512@bucksport.safeport.com>
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My earlier post asked three questions: (1) does a list of all commands and
options exist; (2) How to tell thick from thin jail; (3) a philosophical
rant.
#2 is a zfs question not an iocage one. I have two jails hosts one for
experimenting/learning/playing and one for getting stuff done. man zfs and
google make me think the answer can be inferred from 'zfs list -o space'
zfs space properties selected by -o
---------------------
AVAIL - Available on each file system
USED - Being used
USEDSNAP - Being consumed by snapshots of each data set
USEDDS - Being used by the data set itself
USEDREFRESERV - Being used by a refreservation set on the data set
USEDCHILD - Being used by the children of this data set
>From iocage list (play host)
+-----+---------+-------+--------------+---------------+
| JID | NAME | STATE | RELEASE | IP4 |
| 5 | asgard | up | 7.2-RELEASE | 192.168.2.101 |
| 3 | gaia | up | 11.2-RELEASE | 192.168.2.110 |
| 1 | odin | up | 11.2-RELEASE | 192.168.2.112 |
| - | thinman | down | 12.0-RELEASE | 192.168.2.111 |
+-----+---------+-------+--------------+---------------+
zfs list -o space -d 2 zroot/iocage/jails
NAME AVAIL USED USEDSNAP USEDDS USEDREFRESERV USEDCHILD
zroot/iocage/jails/asgard/root 843G 786M 0 786M 0 0
zroot/iocage/jails/gaia/root 843G 15.2M 0 15.2M 0 0
root/iocage/jails/odin/root 843G 15.0M 0 15.0M 0 0
zroot/iocage/jails/thinman/root 843G 1.88G 452K 1.88G 0 0
extracting only the root dataset. Here the answer is clear.
On the 'real' host USEDSNAP is also definitive here (I think). This system
has a number or legacy jails (<11.0) I did not exclude their data until I
was writting this email. I think the USEDCHILD values come from the
template I'm using. That begets another iocage question, ignored for now.
>From iocage list (real host)
+-----+------------+-------+------------------------+-----------+
| JID | NAME | STATE | RELEASE | IP4 |
| 144 | cyrus | up | 12.2-RELEASE | 10.0.3.16 |
| 142 | ogunquit | up | 12.2-RELEASE | 10.0.3.18 |
| 143 | york | up | 12.2-RELEASE | 10.0.3.12 |
+-----+------------+-------+------------------------+-----------+
find . -type f -name config.json -maxdepth 2 -exec grep -i cloned {} +
./secure/config.json: "cloned_release": "12.2-RELEASE",
./ogunquit/config.json: "cloned_release": "12.2-RELEASE",
./newmeadows/config.json: "cloned_release": "12.2-RELEASE",
./dovecot/config.json: "cloned_release": "EMPTY",
./york/config.json: "cloned_release": "12.2-RELEASE",
secure, newmeadows and dovecot don't count. They are jails running older
FreeBSDs. I did all sorts of things here so nothing can be inferred from
config.json.
So using zfs again I removed the USEDREFRESERV column (all zeros) and the
legacy jails.
NAME AVAIL USED USEDSNAP USEDDS USEDCHILD
zroot/iocage/jails 12.2T 109G 0 366K 109G
zroot/iocage/jails/cyrus 12.2T 2.12G 0 247K 2.12G
zroot/iocage/jails/cyrus/root 12.2T 2.12G 0 2.12G 0
zroot/iocage/jails/ogunquit 12.2T 2.45G 0 265K 2.45G
zroot/iocage/jails/ogunquit/root 12.2T 2.45G 0 2.45G 0
zroot/iocage/jails/york 12.2T 2.43G 0 265K 2.43G
zroot/iocage/jails/york/root 12.2T 2.43G 0 2.43G 0
cyrus, ogunquit and york are thick jails. USEDCHILD comes from the use of a
template, I think. I would appreciate any zfs expert's ideas/comments on my
conclusions.
_____
Douglas Denault
http://www.safeport.com
doug@safeport.com
Voice: 301-217-9220
Fax: 301-217-9277
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