Problems running post-backup plugin

[yzenezy]

Hi,

I'm using mysql-zrm 3.0 on CentOS release 5.11 and want to use the post-backup plugin but can't seem to get it to work.

I configured it in the /etc/mysql-zrm/lincoln/mysql-zrm.conf with the following lines:


post-backup-plugin="/usr/share/mysql-zrm/plugins/post-backup.pl"
post-backup-plugin-options="AAAAA BBBBB"

I also configured the /usr/share/mysql-zrm/plugins/post-backup.pl script to do something:


---8<---
59 $argsize = @ARGV;
60 print "Found $argsize elements in ARGV array\n";
61
62 foreach( @ARGV ){
63 print "Found agument: ";
64 print "$_\n";
65 #system('mysql -h host -uuser -psecret -e "purge master logs before date_sub(now(), interval 3 day);" databasename');
66 }
67 print "The 'foreach' had it's chance. Did it print a message?\n";
68 exit(0);
---8<---

but I can't see that it's being called at all. Here's some logging from /var/log/mysql-zrm/mysql-zrm.log:


Mon Feb 09 00:00:01 2015: lincoln:backup:INFO: START OF BACKUP
Mon Feb 09 00:00:01 2015: lincoln:backup:INFO: PHASE START: Initialization
Mon Feb 09 00:00:01 2015: lincoln:backup:INFO: The quick backup-type is supported only for snapshot backups. Setting backup-type to 'regular'
Mon Feb 09 00:00:01 2015: lincoln:backup:INFO: backup-set=lincoln
Mon Feb 09 00:00:01 2015: lincoln:backup:INFO: backup-date=20150209000001
Mon Feb 09 00:00:01 2015: lincoln:backup:INFO: mysql-server-os=Linux/Unix
Mon Feb 09 00:00:01 2015: lincoln:backup:INFO: backup-type=regular
Mon Feb 09 00:00:01 2015: lincoln:backup:INFO: host=lincoln.motec.com.au
Mon Feb 09 00:00:01 2015: lincoln:backup:INFO: backup-date-epoch=1423400401
Mon Feb 09 00:00:01 2015: lincoln:backup:INFO: retention-policy=7D
Mon Feb 09 00:00:01 2015: lincoln:backup:INFO: mysql-zrm-version=ZRM for MySQL Community Edition - version 3.0
Mon Feb 09 00:00:01 2015: lincoln:backup:INFO: mysql-version=5.1.73-log
Mon Feb 09 00:00:01 2015: lincoln:backup:INFO: backup-directory=/var/lib/mysql-zrm/lincoln/20150209000001
Mon Feb 09 00:00:01 2015: lincoln:backup:INFO: backup-level=1
Mon Feb 09 00:00:01 2015: lincoln:backup:INFO: PHASE END: Initialization
Mon Feb 09 00:00:01 2015: lincoln:backup:INFO: PHASE START: Running pre backup plugin
Mon Feb 09 00:00:01 2015: lincoln:backup:INFO: PHASE END: Running pre backup plugin
Mon Feb 09 00:00:01 2015: lincoln:backup:INFO: PHASE START: Flushing logs
Mon Feb 09 00:00:02 2015: lincoln:backup:INFO: PHASE END: Flushing logs
Mon Feb 09 00:00:02 2015: lincoln:backup:INFO: PHASE START: Creating incremental backup
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: incremental=mysql-bin.[0-9]*
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: PHASE END: Creating incremental backup
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: PHASE START: Calculating backup size & checksums
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: next-binlog=mysql-bin.000354
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: last-backup=/var/lib/mysql-zrm/lincoln/20150208000002
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: backup-size=0.05 MB
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: PHASE END: Calculating backup size & checksums
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: PHASE START: Compression/Encryption
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: compress=
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: backup-size-compressed=0.01 MB
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: PHASE END: Compression/Encryption
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: read-locks-time=00:00:00
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: flush-logs-time=00:00:01
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: compress-encrypt-time=00:00:00
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: backup-time=00:00:02
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: backup-status=Backup succeeded
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: Backup succeeded
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: PHASE START: Running post backup plugin
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: PHASE END: Running post backup plugin
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: PHASE START: Cleanup
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: PHASE END: Cleanup
Mon Feb 09 00:00:03 2015: lincoln:backup:INFO: END OF BACKUP
Mon Feb 09 04:00:01 2015: purge:INFO: Purging Backup /var/lib/mysql-zrm/lincoln/20150202000002

Why don't I see any of my perl print messages in the logs?

When I actually have the perl system call un-commented (line 65), it doesn't seem to do anything either (note that I have changed the configured options for the mysql system call to protect the innocent in this post).

What am I missing here? How can I call the post-backup script and have it do something useful?

Is there a way to do a dry-run/test call for mysql-zrm to see what happens without affecting a running system?

I've done this to see some results:


# pwd
/usr/share/mysql-zrm/plugins
# ./post-backup.pl AAAAA BBBBB
Found 2 elements in ARGV array
Found agument: AAAAA
Found agument: BBBBB
The 'foreach' had it's chance. Did it print a message?

Also, I'm quite confused over the (limited) documentation for this plugin. I have not worked out what parameters (or the syntax) will be passed and when. What does it mean in the post-backup.pl comments when it says: "The second time the post-backup-plugin is called it will have 2 parameters" ?

Clearly I am confused. I'm not a perl programmer but it's not the first time I've written/customised perl scripts. I can work through the syntax of most scripting languages without issues (php, javascript, ...). I used to program C and Java, and script regularly in bash so I do know something about coding. A clear example of the post-backup.pl would say a 1000 words in helping me understand this plugin.

Someone please hit me with a clue stick. Thanks in advance.

Kind regards,
Tom

[yzenezy]

Anyone care to comment?

[yzenezy]

man 1 mysql-zrm-backup has some information but I'm still struggling to get a full picture and my script doesn't appear to be called at all:



--post-backup-plugin plugin
Set the plugin along with full pathname to be called after a
backup run. If synchronous-checksum is not set or its value is
set to zero, the post backup plugin is called twice, once at the
end of backup and once when the checksum is finished.

--post-backup-plugin-options "Option1 Option2 Option3 Option4..."
option1 is the value of post-backup-plugin-options from the
mysql-zrm.conf(5) file. option2 is the data being backed up. It
will be either

--all-databases
Use when all databases on the server are being backed up.

--database database1 database2...
Use when selected databases are being backed up.

--database database --tables table1 table2...
Use if selected tables are being backed up.

Option3 will be --backup-directory path

Option4 will be --checksum-pending or it will be --checksum-fin-
ished if synchronous-checksum is set to 1.

If synchronous-checksum is not set or its value is set to zero,
the post-backup-plugin is called again and it will have 3 param-
eters First parameter is the value of post-backup-plugin-options
from the mysql-zrm.conf(5) configuration file. Second parameter
will be --backup-directory path. Third parameter will be
--checksum-finished.


180+ views and still no one has any ideas?

[pyeatman]

I haven't tried to use the perl pre/post-backup.pl scripts in /usr/share/mysql-zrm/plugins/ directly but if I simply add the the post-backup-plugin parameter in mysql-zrm.conf to specify the path of an file (bash script in my case) that can be executed by mysql, it is executed. Parameters I added were:

post-backup-plugin="/var/lib/mysql-zrm/print-args.bash"
post-backup-plugin-options="dbuser dbpasswd MySQL_servername"

Also, if I add verbosity:

verbose="1"

...I can see in the logs the plugin being called:

Fri May 15 20:30:09 2015: rhel5-64:backup:INFO: Executing post-backup-plugin
Fri May 15 20:30:09 2015: rhel5-64:backup:INFO: Command being executed is /var/lib/mysql/print-args.bash dbuser dbpasswd MySQL_servername --all-databases --backup-directory /var/lib/mysql-zrm/rhel5-64/20150515203004 --checksum-pending
Fri May 15 20:30:09 2015: rhel5-64:backup:INFO: Return value from post-backup-plugin is 0

[Glouber]

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[paddy]

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