BUG #15785: create slave through archive log replication
The following bug has been logged on the website:
Bug reference: 15785
Logged by: ram pratap maurya
Email address: rampratap0000@gmail.com
PostgreSQL version: 11.0
Operating system: linux
Description:
I have one master and slave1 and i am creating one more slave through
archive log , but is showing below error after 4 hr replication.
cp: cannot stat
/var/lib/pgsql/11/data/pg_log_archive/0000000100002C2F0000000A No such file
or directory
2019-04-29 11:29:43.518 IST [852] LOG: started streaming WAL from primary
at 2C2F 28000000 on timeline 1
2019-04-29 11 2943.518 IST [852] FATAL could not receive data from WAL
stream: ERROR: requested WAL segment 0000000100002C2F0000000A has already
been removed
and when we check archive log in directory :pg_log_archive on Master this
archive log is present "0000000100002C2F0000000A".
can you suggest how to confirm slave to replicate through archive log.
please fine below configuration details of recovery.conf slave2 and
pg_hba.conf file of slave2
Recovery.conf:
standby_mode = 'on'
primary_conninfo = 'user=postgres passfile=''/var/lib/pgsql/.pgpass''
host=XXX.XXX.X.XX port=5432 sslmode=prefer sslcompression=0
krbsrvname=postgres target_session_attrs=any'
restore_command = 'cp /var/lib/pgsql/11/data/pg_log_archive/%f "%p"'
pg_hba.conf :
# "local" is for Unix domain socket connections only
local all all peer
# IPv4 local connections:
host all all 127.0.0.1/32 ident
# IPv6 local connections:
host all all ::1/128 ident
# Allow replication connections from localhost, by a user with the
# replication privilege.
#local replication postgres trust
#host replication postgres 127.0.0.1/32 trust
#host replication postgres ::1/128 trust
host replication replication XXX.XXX.X.XX/32 md5
host replication postgres XXX.XXX.X.XX/32 trust
host replication replication 127.0.0.1/32 md5
host replication postgres 127.0.0.1/32 trust
host all all 0.0.0.0/0 md5
but is showing below error after 5 hr replication.
cp: cannot stat
`/var/lib/pgsql/11/data/pg_log_archive/0000000100002C2F0000000A': No such
file or directory
2019-04-29 11:29:43.518 IST [852] LOG: started streaming WAL from primary
at 2C2F/28000000 on timeline 1
2019-04-29 11:29:43.518 IST [852] FATAL: could not receive data from WAL
stream: ERROR: requested WAL segment 0000000100002C2F0000000A has already
been removed
and when we check archive log in directory :pg_log_archive on Master this
archive log is present "0000000100002C2F0000000A".
can you suggest
Em seg, 29 de abr de 2019 às 05:44, PG Bug reporting form
<noreply@postgresql.org> escreveu:
I have one master and slave1 and i am creating one more slave through
archive log , but is showing below error after 4 hr replication.
This is not a bug. Use pgsql-general ML instead.
cp: cannot stat
/var/lib/pgsql/11/data/pg_log_archive/0000000100002C2F0000000A No such file
or directory
2019-04-29 11:29:43.518 IST [852] LOG: started streaming WAL from primary
at 2C2F 28000000 on timeline 1
2019-04-29 11 2943.518 IST [852] FATAL could not receive data from WAL
stream: ERROR: requested WAL segment 0000000100002C2F0000000A has already
been removed
Master and slave are in the same host?
Recovery.conf:
standby_mode = 'on'
primary_conninfo = 'user=postgres passfile=''/var/lib/pgsql/.pgpass''
host=XXX.XXX.X.XX port=5432 sslmode=prefer sslcompression=0
krbsrvname=postgres target_session_attrs=any'
restore_command = 'cp /var/lib/pgsql/11/data/pg_log_archive/%f "%p"'
... if master and slave aren't in the same host, restore_command must
grab archives directly from master (or archive directly in slave or
even in another host) such as:
restore_command = 'scp
postgres@myhost:/var/lib/pgsql/11/data/pg_log_archive/%f %p'
In this case, user postgres in myhost must access master without password.
--
Euler Taveira Timbira -
http://www.timbira.com.br/
PostgreSQL: Consultoria, Desenvolvimento, Suporte 24x7 e Treinamento
Em qui, 2 de mai de 2019 às 06:33, ram pratap maurya
<rampratap0000@gmail.com> escreveu:
Master and 1slave is smae host and location and 2slave (i am createg 2nd slave for DR purpose) is another location.
when we replicating 2nd slave it replicate via streeming replication (pg_wal) . i want 2nd salve replicate through pg_log_archive.
please suggest.
Why don't you want to use streaming for 2nd slave?
If you want to replicate to 2nd slave applying WAL files, remove
primary_conninfo and add restore_command such as:
restore_command = 'scp
postgres@myhost:/var/lib/pgsql/11/data/pg_log_archive/%f %p'
or modify archive_command in the master to archive in the 2nd slave as
well. In this case, restore command will be a simple cp:
restore_command = 'cp /path/to/archives/%f %p'
in your reply myhost is a master ip?.
Yes.
--
Euler Taveira Timbira -
http://www.timbira.com.br/
PostgreSQL: Consultoria, Desenvolvimento, Suporte 24x7 e Treinamento
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