On 04/17/2016 12:13 PM, Andrej Vanek wrote:
Hello Adrian,
I tried to use -U without "su"- launched directly by root: same behaviour.
Finally I reverted my script to use standard backup (pg_start_backup;
rsync; pg_stop_backup)- this works- the only downside is possible
collisions with on-line backup/synchronizaiton of other two nodes on
master node...
Back to the pg_basebackup issue: it is clear to me that this is an issue
of environment which launched pg_basebackup.
Possibly either some privileges or some kernel parameters/limits. Who
knows?
Summary: clusterlab's crm_mon launched a shell script starting
pg_basebackup which fails to do some its work (pg_basebackup: could not
wait for child process: No child processes)- probably due to some
failing system call.
How can I report to clusterlabs: What system call fails in pg_basebackup?
All I can to do is point you at:
https://wiki.postgresql.org/wiki/Getting_a_stack_trace_of_a_running_PostgreSQL_backend_on_Linux/BSD
Best Regards, Andrej
2016-04-17 1:09 GMT+02:00 Adrian Klaver <adrian.kla...@aklaver.com
<mailto:adrian.kla...@aklaver.com>>:
Is the su - even necessary?
pg_basebackup is a Postgres client program you can specify the user
you want it to connect to using -U.
Or do you need the script to run as postgres in order to get
permissions on wherever you are creating the backup directory?
have to find out why pg_basebackup cannot fork when launched
from crm_mon.
I assume crm_mon is this:
http://linux.die.net/man/8/crm_mon
from Pacemaker.
I do not use Pacemaker, but I am pretty sure that running what is a
monitoring program in daemon mode and then shelling out to another
program is not workable. The docs seem to bear this out:
http://clusterlabs.org/wiki/PgSQL_Replicated_Cluster#Installation
https://github.com/smbambling/pgsql_ha_cluster/wiki/Building-A-Highly-Available-Multi-Node-PostgreSQL-Cluster
--
Adrian Klaver
adrian.kla...@aklaver.com
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