hi list,
i'm installing a streaming replication master-slave setup in ubuntu 12.04 LTS, with postgresql 9.1
the tutorials and the documentation are a very good start point, but i have one question related to some fine grained configurations.
it is said that i should stop the master db in order to make de starting backup, OR run pg_start_backup and keep the archive files for the slave to catch up. if i dont do this, maybe the slave stays far behind the master and the wal_segments arent enough to start the replication.
if I understand this right, i can "combine" the old "warm standby" configs of archive_command in the master and restore command in the slave to ensure that the slave will have the necessary info to start the replication.
i mean, i can have both configurations enabled?
right now, my streaming replication setup has this configs:
recovery.conf (slave)
-----------------------------------
standby_mode = 'on'
primary_conninfo = 'host=192.168.206.134'
trigger_file = '/var/lib/postgresql/9.1/sgi/sgi.trigger'
restore_command = '/usr/lib/postgresql/9.1/bin/pg_standby -d -k 100 -s 20 -t /var/lib/postgresql/9.1/sgi.trigger /var/lib/postgresql/9.1/archive %f %p'
archive_cleanup_command = '/usr/lib/postgresql/9.1/bin/pg_archivecleanup /var/lib/postgresql/9.1/archive %r'
-----------------------------------
postgresql.conf (master)
-----------------------------------
data_directory = '/var/lib/postgresql/9.1/sgi'
hba_file = '/etc/postgresql/9.1/sgi/pg_hba.conf'
ident_file = '/etc/postgresql/9.1/sgi/pg_ident.conf'
external_pid_file = '/var/run/postgresql/9.1-sgi.pid'
listen_addresses = '*'
port = 5432
max_connections = 100
unix_socket_directory = '/var/run/postgresql'
ssl = true
shared_buffers = 24MB
wal_level = hot_standby
archive_mode = on
archive_command = 'rsync -arv %p 192.168.206.133:/var/lib/postgresql/9.1/archive/%f </dev/null'
archive_timeout = 900
max_wal_senders = 5
wal_keep_segments = 100
log_line_prefix = '%t '
datestyle = 'iso, mdy'
lc_messages = 'en_US.UTF-8'
lc_monetary = 'en_US.UTF-8'
lc_numeric = 'en_US.UTF-8'
lc_time = 'en_US.UTF-8'
default_text_search_config = 'pg_catalog.english'
-----------------------------------
thanks,
--
Roberto Scattini
