Apr 222019
 

ZFS is very flexible about mountpoints, and there are many features available to provide great flexibility.

When you create your second zpool this is what it might look like:

$$ zfs list -r main_tank
NAME                                                       USED  AVAIL  REFER  MOUNTPOINT
main_tank                                                  893G  3.52T    96K  /main_tank
main_tank/data                                             786G  3.52T    88K  /main_tank/data
main_tank/data/dvl                                         755G  3.52T   755G  /main_tank/data/dvl
main_tank/data/freshports                                 31.4G  3.52T    88K  /main_tank/data/freshports
main_tank/data/freshports/backend                         3.11G  3.52T    88K  /main_tank/data/freshports/backend

This is a pool I created long ago, but it will be a decent example. When you create zpool main_tank, the default mountpoint is /main_tank.

You might be happy with that, but you don’t have to be content. You can do magical things.

Skip to the bottom to see more.

Some highlights are:

  • mount point can be inherited
  • not all filesystems in a zpool need to be mounted
  • each filesystem (directory) can have different ZFS characteristics

In my case, let’s look at this new zpool I created earlier today and I will show you some very simple alternatives. This zpool use NVMe devices which should be faster than SSDs especially when used with multiple concurrent writes. This is my plan: run all the Bacula regression tests concurrently.

My use case: storage area for bacula-regression tests in a one jail. There are 7 such jails.

These are the dictories within the mysql57 jail which get the most use during regression testing:

  1. /var/db/mysql
  2. /usr/home/dan/src/bacula

My goal: have as few mount directives as possible, use inheritance, and make it just mount into the right places in the jail.

How much space is this?

[dan@mysql57:~/src/bacula] $ sudo du -d1 -ch /var/db/mysql /usr/home/dan/src/bacula
1.6M	/var/db/mysql/mysql
901K	/var/db/mysql/performance_schema
560K	/var/db/mysql/regress
1.0M	/var/db/mysql/sys
579M	/var/db/mysql
147M	/usr/home/dan/src/bacula/regress
 33M	/usr/home/dan/src/bacula/gui
 21M	/usr/home/dan/src/bacula/bacula
 81M	/usr/home/dan/src/bacula/.git
283M	/usr/home/dan/src/bacula
862M	total
[dan@mysql57:~/src/bacula] $ 

Less than 1GB, good. Let’s proceed.

My new zpool, already created is named nvd, and it mounted at /nvd.

[dan@knew:~] $ ls -ld /nvd
drwxr-xr-x  2 root  wheel  2 Apr 21 13:26 /nvd

Let’s not mount that. This could have been specified during zpool create via a -o canmount=off parameter.

[dan@knew:~] $ sudo zfs set canmount=off nvd
[dan@knew:~] $ ls -ld /nvd
ls: /nvd: No such file or directory
[dan@knew:~] $ 

Let’s turn compression off. Again, this could have been a parameter.

[dan@knew:~] $ sudo zfs set compression=lz4 nvd
[dan@knew:~] $ 

These are the various plalces I will mounting datasystems from this zpool:

[dan@knew:~] $ zfs list | egrep -e '(mysql|pg)' | grep -v root
system/iocage/jails/mysql56                    9.30G  29.0T   210K  /iocage/jails/mysql56
system/iocage/jails/mysql57                    9.26G  29.0T   210K  /iocage/jails/mysql57
system/iocage/jails/mysql80                    2.53G  29.0T   210K  /iocage/jails/mysql80
system/iocage/jails/pg10                       8.03G  29.0T   210K  /iocage/jails/pg10
system/iocage/jails/pg11                       8.03G  29.0T   210K  /iocage/jails/pg11
system/iocage/jails/pg94                       7.52G  29.0T   210K  /iocage/jails/pg94
system/iocage/jails/pg95                       6.78G  29.0T   210K  /iocage/jails/pg95
system/iocage/jails/pg96                       6.51G  29.0T   210K  /iocage/jails/pg96

Let’s start by setting the mountpoint, but remember it will not be mounted because we specified canmount=off:

[dan@knew:~] $ sudo zfs set mountpoint=/iocage/jails nvd
[dan@knew:~] $ 

We are going to be messing about with data, and while you might be able to do this while the jail is running, I am not.

[dan@knew:~] $ sudo iocage stop mysql56
* Stopping mysql56
+ Executing prestop OK
+ Stopping services OK
+ Removing devfs_ruleset: 11 OK
+ Removing jail process OK
+ Executing poststop OK
[dan@knew:~] $

What data do we have in the MySQL directory? Let’s save that away into a temp directory:

$ cd /iocage/jails/mysql56/root/var/db/     
$ sudo mkdir mysql-tmp
$ sudo sudo zfs create -p nvd/mysql56/root/var/db/     
cannot create 'nvd/mysql56/root/var/db/': trailing slash in name

Now let’s create the directory structure we need:

$ sudo sudo zfs create -p nvd/mysql56/root/var/db 
$ sudo sudo zfs create -p nvd/mysql56/root/var/db/mysql
$ sudo sudo zfs create -p nvd/mysql56/root/var/db/mysql_secure
$ sudo sudo zfs create -p nvd/mysql56/root/var/db/mysql_tmpdir
$ sudo zfs set canmount=on nvd/mysql56/root/var/db/mysql
$ sudo zfs set canmount=on nvd/mysql56/root/var/db/mysql_secure
$ sudo zfs set canmount=on nvd/mysql56/root/var/db/mysql_tmpdir

What do we see?

$ ls -l
total 17706
drwx------  2 operator  operator       10 Aug 23  2015 entropy
drwxr-xr-x  3 root      wheel           4 Mar 18 21:05 etcupdate
drwx------  4 root      wheel          11 Mar 18 21:05 freebsd-update
drwx------  2 root      wheel           2 Jun 22  2018 hyperv
drwx------  2 root      wheel           2 Dec  4  2012 ipf
-r--r--r--  1 nobody    wheel      247659 Sep  2  2017 locate.database
drwxr-xr-x  2 logcheck  logcheck        5 Aug 18  2015 logcheck
-rw-------  1 root      wheel       28808 Aug  5  2018 mergemaster.mtree
drwxr-xr-x  5 root      wheel           5 Apr 21 20:30 mysql-tmp
drwx------  2 root      wheel           2 Jun 22  2018 ntp
-rw-r--r--  1 root      wheel       10663 Oct 27 12:10 ntpd.leap-seconds.list
drwxr-xr-x  2 root      wheel          10 Apr 21 04:13 pkg
drwxr-xr-x  2 root      wheel           2 Dec  4  2012 ports
drwxr-xr-x  2 root      wheel           2 Dec  4  2012 portsnap
drwx------  2 postfix   wheel           3 May 16  2016 postfix
-rw-r--r--  1 root      wheel     2097920 Mar 18 21:05 services.db
drwx--x--x  3 root      wheel           3 Mar 18  2016 sudo
drwxr-xr-x  3 root      wheel           3 Jun 22  2018 zfsd

Nothing. Where is the stuff we created?

[dan@knew:/iocage/jails/mysql56/root/var/db] $ zfs get -r canmount nvd                    
NAME                                  PROPERTY  VALUE     SOURCE
nvd                                   canmount  off       local
nvd/mysql56                           canmount  on        default
nvd/mysql56/root                      canmount  on        default
nvd/mysql56/root/var                  canmount  on        default
nvd/mysql56/root/var/db               canmount  on        default
nvd/mysql56/root/var/db/mysql         canmount  on        local
nvd/mysql56/root/var/db/mysql_secure  canmount  on        local
nvd/mysql56/root/var/db/mysql_tmpdir  canmount  on        local

Look at all that canmount. Let’s fix that.

$ sudo zfs set canmount=off nvd/mysql56
cannot unmount '/iocage/jails/mysql56/root/var': Device busy

Oh, it’s mounted:

sudo zfs umount nvd/mysql56/root/var/db/mysql_tmpdir
sudo zfs umount nvd/mysql56/root/var/db
sudo zfs umount nvd/mysql56/root/var
sudo zfs umount nvd/mysql56/root
sudo zfs umount nvd/mysql56

Turn that stuff off:

$ sudo zfs set canmount=off nvd/mysql56
$ sudo zfs set canmount=off nvd/mysql56/root 
$ sudo zfs set canmount=off nvd/mysql56/root/var
$ sudo zfs set canmount=off nvd/mysql56/root/var/db

There, this looks better:

$ zfs get -r canmount nvd
NAME                                  PROPERTY  VALUE     SOURCE
nvd                                   canmount  off       local
nvd/mysql56                           canmount  off       local
nvd/mysql56/root                      canmount  off       local
nvd/mysql56/root/var                  canmount  off       local
nvd/mysql56/root/var/db               canmount  off       local
nvd/mysql56/root/var/db/mysql         canmount  on        local
nvd/mysql56/root/var/db/mysql_secure  canmount  on        local
nvd/mysql56/root/var/db/mysql_tmpdir  canmount  on        local

Now let’s mount and see what we have:

$ sudo zfs mount nvd/mysql56/root/var/db/mysql
$ sudo zfs mount nvd/mysql56/root/var/db/mysql_secure
$ sudo zfs mount nvd/mysql56/root/var/db/mysql_tmpdir
$ ls -l
total 17708
drwx------  2 operator  operator       10 Aug 23  2015 entropy
drwxr-xr-x  3 root      wheel           4 Mar 18 21:05 etcupdate
drwx------  4 root      wheel          11 Mar 18 21:05 freebsd-update
drwx------  2 root      wheel           2 Jun 22  2018 hyperv
drwx------  2 root      wheel           2 Dec  4  2012 ipf
-r--r--r--  1 nobody    wheel      247659 Sep  2  2017 locate.database
drwxr-xr-x  2 logcheck  logcheck        5 Aug 18  2015 logcheck
-rw-------  1 root      wheel       28808 Aug  5  2018 mergemaster.mtree
drwxr-xr-x  2 root      wheel           2 Apr 21 20:32 mysql
drwxr-xr-x  5 root      wheel           5 Apr 21 20:30 mysql-tmp
drwxr-xr-x  2 root      wheel           2 Apr 21 20:32 mysql_secure
drwxr-xr-x  2 root      wheel           2 Apr 21 20:32 mysql_tmpdir
drwx------  2 root      wheel           2 Jun 22  2018 ntp
-rw-r--r--  1 root      wheel       10663 Oct 27 12:10 ntpd.leap-seconds.list
drwxr-xr-x  2 root      wheel          10 Apr 21 04:13 pkg
drwxr-xr-x  2 root      wheel           2 Dec  4  2012 ports
drwxr-xr-x  2 root      wheel           2 Dec  4  2012 portsnap
drwx------  2 postfix   wheel           3 May 16  2016 postfix
-rw-r--r--  1 root      wheel     2097920 Mar 18 21:05 services.db
drwx--x--x  3 root      wheel           3 Mar 18  2016 sudo
drwxr-xr-x  3 root      wheel           3 Jun 22  2018 zfsd
[dan@knew:/iocage/jails/mysql56/root/var/db] $ 

There, we have the directores (mysql, mysql-tmp, and mysql_secure) appearing.

Those permissions need fixing though:

$ sudo sudo chown -R mysql:mysql mysql mysql_secure mysql_tmpdir
$ ls -ld mysql mysql_secure mysql_tmpdir
drwxr-xr-x  2 mysql  mysql  2 Apr 21 20:32 mysql
drwxr-xr-x  2 mysql  mysql  2 Apr 21 20:32 mysql_secure
drwxr-xr-x  2 mysql  mysql  2 Apr 21 20:32 mysql_tmpdir

Oh.. atime I forgot about that.

$ zfs get -r atime nvd
NAME                                  PROPERTY  VALUE  SOURCE
nvd                                   atime     on     default
nvd/mysql56                           atime     on     default
nvd/mysql56/root                      atime     on     default
nvd/mysql56/root/var                  atime     on     default
nvd/mysql56/root/var/db               atime     on     default
nvd/mysql56/root/var/db/mysql         atime     on     default
nvd/mysql56/root/var/db/mysql_secure  atime     on     default
nvd/mysql56/root/var/db/mysql_tmpdir  atime     on     default

If we turn off atime we reduce the number of writes because we are not updating the atime of the files with every read.

$ sudo zfs set atime=off nvd
$ zfs get -r atime nvd
NAME                                  PROPERTY  VALUE  SOURCE
nvd                                   atime     off    local
nvd/mysql56                           atime     off    inherited from nvd
nvd/mysql56/root                      atime     off    inherited from nvd
nvd/mysql56/root/var                  atime     off    inherited from nvd
nvd/mysql56/root/var/db               atime     off    inherited from nvd
nvd/mysql56/root/var/db/mysql         atime     off    inherited from nvd
nvd/mysql56/root/var/db/mysql_secure  atime     off    inherited from nvd
nvd/mysql56/root/var/db/mysql_tmpdir  atime     off    inherited from nvd
$ 

Now I copy over the data:

$ sudo cp -a mysql-tmp/mysql/* mysql/
$ sudo cp -a mysql-tmp/mysql_secure/* mysql_secure/
cp: mysql-tmp/mysql_secure/*: No such file or directory

Nothing to copy? are you sure?

$ sudo find mysql-tmp/mysql_secure
mysql-tmp/mysql_secure

Yes, I’m sure.

$ sudo cp -a mysql-tmp/mysql_tmpdir/* mysql_tmpdir/
cp: mysql-tmp/mysql_tmpdir/*: No such file or directory
$ sudo find mysql-tmp/mysql_tmpdir/
mysql-tmp/mysql_tmpdir/
$ zpool list nvd
NAME   SIZE  ALLOC   FREE  CKPOINT  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
nvd    222G  1.34G   221G        -         -     0%     0%  1.00x  ONLINE  -

So far, this has used about 1.34G

Now let’s set up the bacula regression code directory.

$ sudo sudo zfs create -p -o canmount=off nvd/mysql56/root/usr/home/dan/src/bacula
$ zfs get -r canmount nvd
NAME                                      PROPERTY  VALUE     SOURCE
nvd                                       canmount  off       local
nvd/mysql56                               canmount  off       local
nvd/mysql56/root                          canmount  off       local
nvd/mysql56/root/usr                      canmount  on        default
nvd/mysql56/root/usr/home                 canmount  on        default
nvd/mysql56/root/usr/home/dan             canmount  on        default
nvd/mysql56/root/usr/home/dan/src         canmount  on        default
nvd/mysql56/root/usr/home/dan/src/bacula  canmount  off       local
nvd/mysql56/root/var                      canmount  off       local
nvd/mysql56/root/var/db                   canmount  off       local
nvd/mysql56/root/var/db/mysql             canmount  on        local
nvd/mysql56/root/var/db/mysql_secure      canmount  on        local
nvd/mysql56/root/var/db/mysql_tmpdir      canmount  on        local
$ 

I failed. I should have supplied more -o parameters.

$ sudo zfs set canmount=off nvd/mysql56/root/usr/home/dan/src
$ sudo zfs set canmount=off nvd/mysql56/root/usr/home/dan    
$ sudo zfs set canmount=off nvd/mysql56/root/usr/home    
$ sudo zfs set canmount=off nvd/mysql56/root/usr     
$ zfs get -r canmount nvd
NAME                                      PROPERTY  VALUE     SOURCE
nvd                                       canmount  off       local
nvd/mysql56                               canmount  off       local
nvd/mysql56/root                          canmount  off       local
nvd/mysql56/root/usr                      canmount  off       local
nvd/mysql56/root/usr/home                 canmount  off       local
nvd/mysql56/root/usr/home/dan             canmount  off       local
nvd/mysql56/root/usr/home/dan/src         canmount  off       local
nvd/mysql56/root/usr/home/dan/src/bacula  canmount  off       local
nvd/mysql56/root/var                      canmount  off       local
nvd/mysql56/root/var/db                   canmount  off       local
nvd/mysql56/root/var/db/mysql             canmount  on        local
nvd/mysql56/root/var/db/mysql_secure      canmount  on        local
nvd/mysql56/root/var/db/mysql_tmpdir      canmount  on        local

That is better, but see below for more changes.

Let’s move the data out of the way.

$ sudo mv bacula baulca.origin

Note my typo above.

Let’s fix bacula and copy over the data.

$ sudo zfs set canmount=yes nvd/mysql56/root/usr/home/dan/src/bacula
cannot set property for 'nvd/mysql56/root/usr/home/dan/src/bacula': 'canmount' must be one of 'on | off | noauto'
$ sudo zfs set canmount=on nvd/mysql56/root/usr/home/dan/src/bacula
$ ls -l
total 19
drwxr-xr-x  6 dltstats  dltstats  7 Jan 14 23:33 baulca.origin
$ sudo zfs mount nvd/mysql56/root/usr/home/dan/src/bacula
$ ls -l
total 20
drwxr-xr-x  2 root      wheel     2 Apr 21 20:48 bacula
drwxr-xr-x  6 dltstats  dltstats  7 Jan 14 23:33 baulca.origin
$ 

set permissions:

$ sudo chown dan:dan bacula 

Copy over the data

$ sudo cp -a baulca.origin/* bacula/
cp: baulca.origin/regress/weird-files/sock-file is a socket (not copied).
$ 

Sockets can be ignored.

One more check to see what is mounted:

$ zfs get -r mounted nvd
NAME                                      PROPERTY  VALUE    SOURCE
nvd                                       mounted   no       -
nvd/mysql56                               mounted   no       -
nvd/mysql56/root                          mounted   no       -
nvd/mysql56/root/usr                      mounted   no       -
nvd/mysql56/root/usr/home                 mounted   no       -
nvd/mysql56/root/usr/home/dan             mounted   no       -
nvd/mysql56/root/usr/home/dan/src         mounted   no       -
nvd/mysql56/root/usr/home/dan/src/bacula  mounted   yes      -
nvd/mysql56/root/var                      mounted   no       -
nvd/mysql56/root/var/db                   mounted   no       -
nvd/mysql56/root/var/db/mysql             mounted   yes      -
nvd/mysql56/root/var/db/mysql_secure      mounted   yes      -
nvd/mysql56/root/var/db/mysql_tmpdir      mounted   yes      -

Start the jail:

$ sudo iocage start mysql56
* Starting mysql56
  + Started OK
  + Using devfs_ruleset: 11
  + Starting services OK
  + Executing poststart OK

Log into the jail:

[dan@mysql56:~] $ cd src
[dan@mysql56:~/src] $ ls -l
total 21
drwxr-xr-x  6 dan  dan  7 Apr 21 20:56 bacula
drwxr-xr-x  6 dan  dan  7 Jan 14 23:33 baulca.origin
[dan@mysql56:~/src] $ 

How does MySQL look?

[dan@mysql56:~/src] $ cd /var/db
[dan@mysql56:/var/db] $ ls -l
total 17709
drwx------  2 operator  operator       10 Aug 23  2015 entropy
drwxr-xr-x  3 root      wheel           4 Mar 18 21:05 etcupdate
drwx------  4 root      wheel          11 Mar 18 21:05 freebsd-update
drwx------  2 root      wheel           2 Jun 22  2018 hyperv
drwx------  2 root      wheel           2 Dec  4  2012 ipf
-r--r--r--  1 nobody    wheel      247659 Sep  2  2017 locate.database
drwxr-xr-x  2 logcheck  logcheck        5 Aug 18  2015 logcheck
-rw-------  1 root      wheel       28808 Aug  5  2018 mergemaster.mtree
drwxr-xr-x  6 mysql     mysql          24 Apr 21 20:56 mysql
drwxr-xr-x  5 root      wheel           5 Apr 21 20:30 mysql-tmp
drwxr-xr-x  2 mysql     mysql           2 Apr 21 20:32 mysql_secure
drwxr-xr-x  2 mysql     mysql           2 Apr 21 22:24 mysql_tmpdir
drwx------  2 root      wheel           2 Jun 22  2018 ntp
-rw-r--r--  1 root      wheel       10663 Oct 27 12:10 ntpd.leap-seconds.list
drwxr-xr-x  2 root      wheel          10 Apr 21 04:13 pkg
drwxr-xr-x  2 root      wheel           2 Dec  4  2012 ports
drwxr-xr-x  2 root      wheel           2 Dec  4  2012 portsnap
drwx------  2 postfix   wheel           3 May 16  2016 postfix
-rw-r--r--  1 root      wheel     2097920 Mar 18 21:05 services.db
drwx--x--x  3 root      wheel           3 Mar 18  2016 sudo
drwxr-xr-x  3 root      wheel           3 Jun 22  2018 zfsd
[dan@mysql56:/var/db] $ 

Everything looks good.

For testing, I started regression tests in mysql57, first, then in mysql56. It didn’t take long for mysql56 to catch up and overtake.

The mountpoints

Here are the mountpoint I created:

[dan@knew:~] $ zfs get -r mountpoint nvd 
NAME                                      PROPERTY    VALUE                                               SOURCE
nvd                                       mountpoint  /iocage/jails                                       local
nvd/mysql56                               mountpoint  /iocage/jails/mysql56                               inherited from nvd
nvd/mysql56/root                          mountpoint  /iocage/jails/mysql56/root                          inherited from nvd
nvd/mysql56/root/usr                      mountpoint  /iocage/jails/mysql56/root/usr                      inherited from nvd
nvd/mysql56/root/usr/home                 mountpoint  /iocage/jails/mysql56/root/usr/home                 inherited from nvd
nvd/mysql56/root/usr/home/dan             mountpoint  /iocage/jails/mysql56/root/usr/home/dan             inherited from nvd
nvd/mysql56/root/usr/home/dan/src         mountpoint  /iocage/jails/mysql56/root/usr/home/dan/src         inherited from nvd
nvd/mysql56/root/usr/home/dan/src/bacula  mountpoint  /iocage/jails/mysql56/root/usr/home/dan/src/bacula  inherited from nvd
nvd/mysql56/root/var                      mountpoint  /iocage/jails/mysql56/root/var                      inherited from nvd
nvd/mysql56/root/var/db                   mountpoint  /iocage/jails/mysql56/root/var/db                   local
nvd/mysql56/root/var/db/mysql             mountpoint  /iocage/jails/mysql56/root/var/db/mysql             inherited from nvd/mysql56/root/var/db
nvd/mysql56/root/var/db/mysql_secure      mountpoint  /iocage/jails/mysql56/root/var/db/mysql_secure      inherited from nvd/mysql56/root/var/db
nvd/mysql56/root/var/db/mysql_tmpdir      mountpoint  /iocage/jails/mysql56/root/var/db/mysql_tmpdir      inherited from nvd/mysql56/root/var/db
[dan@knew:~] $ 

A you can see there are two mount points which have SOURCE specified explicitly:

  1. nvd at
    /iocage/jails
  2. nvd/mysql56/root/var/db at iocage/jails/mysql56/root/var/db

We do not need that second local and we can make do with just one. Let me fix that:

[dan@knew:~] $ sudo zfs inherit mountpoint nvd/mysql56/root/var/db
cannot unmount '/iocage/jails/mysql56/root/var/db/mysql_tmpdir': Device busy
[dan@knew:~] $ sudo iocage stop mysql56
* Stopping mysql56
  + Executing prestop OK
  + Stopping services OK
  + Removing devfs_ruleset: 11 OK
  + Removing jail process OK
  + Executing poststop OK
[dan@knew:~] $ sudo zfs inherit mountpoint nvd/mysql56/root/var/db
[dan@knew:~] $ zfs get -r mountpoint nvd
NAME                                      PROPERTY    VALUE                                               SOURCE
nvd                                       mountpoint  /iocage/jails                                       local
nvd/mysql56                               mountpoint  /iocage/jails/mysql56                               inherited from nvd
nvd/mysql56/root                          mountpoint  /iocage/jails/mysql56/root                          inherited from nvd
nvd/mysql56/root/usr                      mountpoint  /iocage/jails/mysql56/root/usr                      inherited from nvd
nvd/mysql56/root/usr/home                 mountpoint  /iocage/jails/mysql56/root/usr/home                 inherited from nvd
nvd/mysql56/root/usr/home/dan             mountpoint  /iocage/jails/mysql56/root/usr/home/dan             inherited from nvd
nvd/mysql56/root/usr/home/dan/src         mountpoint  /iocage/jails/mysql56/root/usr/home/dan/src         inherited from nvd
nvd/mysql56/root/usr/home/dan/src/bacula  mountpoint  /iocage/jails/mysql56/root/usr/home/dan/src/bacula  inherited from nvd
nvd/mysql56/root/var                      mountpoint  /iocage/jails/mysql56/root/var                      inherited from nvd
nvd/mysql56/root/var/db                   mountpoint  /iocage/jails/mysql56/root/var/db                   inherited from nvd
nvd/mysql56/root/var/db/mysql             mountpoint  /iocage/jails/mysql56/root/var/db/mysql             inherited from nvd
nvd/mysql56/root/var/db/mysql_secure      mountpoint  /iocage/jails/mysql56/root/var/db/mysql_secure      inherited from nvd
nvd/mysql56/root/var/db/mysql_tmpdir      mountpoint  /iocage/jails/mysql56/root/var/db/mysql_tmpdir      inherited from nvd
[dan@knew:~] $ sudo iocage start mysql56
* Starting mysql56
  + Started OK
  + Using devfs_ruleset: 11
  + Starting services OK
  + Executing poststart OK
[dan@knew:~] $ 

Much better. The goal is to specify as little as possible.

Following this example, I will create more data set, much like the above, for the following jails:

  1. mysql57
  2. mysql80
  3. pg94
  4. pg95
  5. pg96
  6. pg10
  7. pg11

Hopefully I will get better at getting the specifications correct the first time.

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