Solved zfs snapshot - exclude directory

fred974

fred974

Hi,

At the moment I have a script that do differential backup ....
I keep 30 days worth of snapshot on the server but also send all dailly snapshot offsite..
When I run zfs snapshot -r zroot@-2017-03-29 I get a copy of everything
Code: 
NAME                                                           USED  AVAIL  REFER  MOUNTPOINT
zroot@-2017-03-29                                                 0      -   192K  -
zroot/ROOT@-2017-03-29                                            0      -   192K  -
zroot/ROOT/default@-2017-03-29                                 175M      -   992M  -
zroot/tmp@-2017-03-29                                          176K      -   288K  -
zroot/usr@-2017-03-29                                             0      -   192K  -
zroot/usr/home@-2017-03-29                                     160K      -   376K  -
zroot/usr/jails@-2017-03-29                                    735K      -  4.77G  -
zroot/usr/jails/mariadb@-2017-03-29                            400K      -   120M  -
zroot/usr/jails/mariadb/var@-2017-03-29                        759K      -  26.7M  -
zroot/usr/jails/mariadb/var/db@-2017-03-29                    1.93M      -  31.4M  -
zroot/usr/jails/mariadb/var/db/mysql@-2017-03-29               408K      -   402M  -
zroot/usr/jails/mariadb/var/db/mysql-innodb@-2017-03-29       5.26M      -  76.8M  -
zroot/usr/jails/mariadb/var/db/mysql-innodb-logs@-2017-03-29  3.56M      -  96.2M  -
zroot/usr/jails/nginx@-2017-03-29                             3.11M      -  53.3M  -
zroot/usr/jails/ns1@-2017-03-29                               2.79M      -  88.9M  -
zroot/usr/jails/postfixserver@-2017-03-29                          137M      -  13.8G  -
zroot/usr/jails/wordpress_tpl@-2017-03-29                     7.03M      -  1.31G  -
zroot/usr/ports@-2017-03-29                                    197M      -  1.31G  -
zroot/usr/src@-2017-03-29                                         0      -   957M  -
zroot/var@-2017-03-29                                             0      -   192K  -
zroot/var/audit@-2017-03-29                                       0      -   192K  -
zroot/var/crash@-2017-03-29                                       0      -   192K  -
zroot/var/log@-2017-03-29                                      655K      -   855K  -
zroot/var/mail@-2017-03-29                                     160K      -   400K  -
zroot/var/tmp@-2017-03-29                                      128K      -   192K  -
The whole idea is that if production server goes down, I can take the backup server to the DC and swap them over with minimal downtime..

However, things like
zroot/usr/ports
,
zroot/usr/src
,
zroot/var/tmp are using a lot of disk space over the 30 day period and they are not really needed or restore service...

SO question:
1. How can I exclude directory from snapshot
2. Should I not try to exclude them?

Thank you
 
Instead of using -r, you could create the snapshots specifically for only the datasets you're interested in.

ADDED: The downsides I can think of are that 1) you now have to run multiple commands and 2) snapshots won't be created as one atomic operation.
 
ADDED: The downsides I can think of are that 1) you now have to run multiple commands and 2) snapshots won't be created as one atomic operation.
Click to expand...

One obvious solution would be to take a recursive snapshot each day but have the script then delete the new snapshot on any dataset you want to exclude.

On my system I just have a script that takes snapshots individually based on a per-dataset net.mydomain:snap setting, which also contains the retention settings for that dataset. I have no need for every snapshot to be atomic.
 
Create a separate dataset tree for things you don't want included in snapshots/backups, and move the datasets there.
 
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