我想在两个postgresql 9.5服务器之间设置逻辑复制。我可以在两个虚拟PC上使用它，但是当我尝试在生产机器上使用它时，复制状态为（pglogical.show_replication_status（））。
在我们的主服务器上，有很多数据（〜250GB），因此我们实在无法删除它。但是我通过pg_dump将其移至复制存储服务器。
主要生产服务器：
pg_hba.conf：
local all postgres peer
local all all md5
host all all 127.0.0.1/32 md5
host all all ::1/128 md5
local replication all trust
host replication all 127.0.01/32 trust
host replication all ::1/128 trust
host all all all trust
host replication all all trust
postgresql.conf：
data_directory = '/mnt/Data/fmeterdb/postgresql/9.5/main' # use data in another directory
hba_file = '/etc/postgresql/9.5/main/pg_hba.conf' # host-based authentication file
ident_file = '/etc/postgresql/9.5/main/pg_ident.conf' # ident configuration file
external_pid_file = '/var/run/postgresql/9.5-main.pid' # write an extra PID file
listen_addresses = '*' # what IP address(es) to listen on;
port = 5432 # (change requires restart)
max_connections = 1000 # (change requires restart)
unix_socket_directories = '/var/run/postgresql' # comma-separated list of directories
ssl = true # (change requires restart)
ssl_cert_file = '/etc/ssl/certs/ssl-cert-snakeoil.pem' # (change requires restart)
ssl_key_file = '/etc/ssl/private/ssl-cert-snakeoil.key' # (change requires restart)
shared_buffers = 1024MB # min 128kB
dynamic_shared_memory_type = posix # the default is the first option
shared_preload_libraries = 'pglogical' # (change requires restart)
max_worker_processes = 16
wal_level = logical # minimal, archive, hot_standby, or logical
synchronous_commit = local # synchronization level;
archive_mode = on # enables archiving; off, on, or always
archive_command = 'cp %p /mnt/Data/fmeterdb/postgresql/9.5/main/archive/%f' # command to use to archive a logfile segment
max_wal_senders = 16 # max number of walsender processes
wal_keep_segments = 300 # in logfile segments, 16MB each; 0 disables
max_replication_slots = 16 # max number of replication slots
track_commit_timestamp = on # collect timestamp of transaction commit
synchronous_standby_names = 'pgslave001' # standby servers that provide sync rep
log_line_prefix = '%t [%p-%l] %q%u@%d ' # special values:
log_timezone = 'UTC'
stats_temp_directory = '/var/run/postgresql/9.5-main.pg_stat_tmp'
datestyle = 'iso, ymd'
timezone = 'UTC'
lc_messages = 'hu_HU.UTF-8' # locale for system error message
lc_monetary = 'hu_HU.UTF-8' # locale for monetary formatting
lc_numeric = 'hu_HU.UTF-8' # locale for number formatting
lc_time = 'hu_HU.UTF-8' # locale for time formatting
default_text_search_config = 'pg_catalog.hungarian'
重击：
createuser -s --replication -P khrh_replicator
* Enter password for new role: qwe123
* Enter it again: qwe123
createdb -O khrh_replicator khrh_replicator
psql --username=khrh_replicator
\c fmeter
create extension pglogical;
select pglogical.create_node( node_name := 'khrh_provider', dsn := 'host=10.0.2.1 port=5432 user=khrh_replicator dbname=fmeter' );
select pglogical.create_replication_set('khrh_replication_set');
select pglogical.replication_set_add_table( set_name := 'khrh_replication_set', relation := 'measure_results' synchronize_data := true );
select pglogical.replication_set_add_table( set_name := 'khrh_replication_set', relation := 'measure_runs' synchronize_data := true );
select pglogical.replication_set_add_table( set_name := 'khrh_replication_set', relation := 'measures' synchronize_data := true );
使用这些命令后，我没有收到任何错误消息。
我在存储服务器上执行的步骤：
pg_hba.conf：
local all postgres peer
local all all md5
host all all 127.0.0.1/32 md5
host all all ::1/128 md5
local replication all trust
host replication all 127.0.0.1/32 trust
host replication all ::1/128 trust
host all all all trust
host replication all all trust
postgresql.conf：
data_directory = '/mnt/Data/fmeterdb/postgresql/9.5/main' # use data in another directory
hba_file = '/etc/postgresql/9.5/main/pg_hba.conf' # host-based authentication file
ident_file = '/etc/postgresql/9.5/main/pg_ident.conf' # ident configuration file
external_pid_file = '/var/run/postgresql/9.5-main.pid' # write an extra PID file
listen_addresses = 'localhost,172.17.11.18,10.0.2.3' # what IP address(es) to listen on;
port = 5432 # (change requires restart)
max_connections = 1000 # (change requires restart)
unix_socket_directories = '/var/run/postgresql' # comma-separated list of directories
ssl = on
ssl_cert_file = '/etc/ssl/certs/ssl-cert-snakeoil.pem'
ssl_key_file = '/etc/ssl/private/ssl-cert-snakeoil.key'
shared_buffers = 1024MB # min 128kB
dynamic_shared_memory_type = posix # the default is the first option
shared_preload_libraries = 'pglogical' # (change requires restart)
max_worker_processes = 16 # (change requires restart)
wal_level = logical # minimal, replica, or logical
synchronous_commit = local # synchronization level;
archive_mode = on
archive_command = 'cp -i %p /mnt/Data/fmeterdb/postgresql/9.5/main/archive/%f' # command to use to archive a logfile segment
max_wal_senders = 16 # max number of walsender processes
wal_keep_segments = 400
max_replication_slots = 16 # max number of replication slots
track_commit_timestamp = on # collect timestamp of transaction commit
synchronous_standby_names = 'pgslave001' # standby servers that provide sync rep
hot_standby = on # "off" disallows queries during recovery
log_line_prefix = '%m [%p] %q%u@%d ' # special values:
log_timezone = 'UTC'
cluster_name = '9.5/main' # added to process titles if nonempty
stats_temp_directory = '/var/run/postgresql/9.5-main.pg_stat_tmp'
datestyle = 'iso, ymd'
timezone = 'UTC'
lc_messages = 'hu_HU.UTF-8' # locale for system error message
lc_monetary = 'hu_HU.UTF-8' # locale for monetary formatting
lc_numeric = 'hu_HU.UTF-8' # locale for number formatting
lc_time = 'hu_HU.UTF-8' # locale for time formatting
default_text_search_config = 'pg_catalog.hungarian'
include_dir = 'conf.d' # include files ending in '.conf' from
重击：
createuser -s --replication -P khrh_replicator
* Enter password for new role: qwe123
* Enter it again: qwe123
createdb -O khrh_replicator khrh_replicator
psql --username=urh_replicator
create database fmeter_khrh;
\c fmeter_khrh
create extension pglogical;
select pglogical.create_node( node_name := 'khrh_subscriber', dsn := 'host=10.0.2.3 port=5432 dbname=fmeter_khrh user=khrh_replicator' );
select pglogical.create_subscription( subscription_name := 'khrh_subscription', replication_sets := array['khrh_replication_set'], provider_dsn := 'host=10.0.2.1 port=5432 dbname=fmeter user=khrh_replicator' );
此后我也没有任何错误。
有人遇到过这个问题，我该如何解决？
谢谢！
答案 0 :(得分：0)
pgologic扩展使用postgresql日志来提供错误消息。
要获取当前的复制状态，请使用此
select * from pglogical.show_subscription_status();
在此Depesz帖子中可以找到一些有关初始配置的提示 https://www.depesz.com/2016/11/08/major-version-upgrading-with-minimal-downtime/