1、配置流复制环境
参考：PostgreSQL流复制
2、安装pgpool
itm_pg@docker-> cd pgpool-II-4.0.2
itm_pg@docker->./configure –prefix=/home/itm_pg/pgpool -with
itm_pg@docker->make&make install
3、配置pgpool
itm_pg@docker-> cp pgpool.conf.sample pgpool.conf
itm_pg@docker-> vi pgpool.conf
listen_addresses = '0.0.0.0'
port = 9999
socket_dir = '/tmp'
pcp_port = 9898
pcp_socket_dir = '/tmp'
backend_hostname0 = '192.168.17.190'
backend_port0 = 1921
backend_weight0 = 1
backend_flag0 = 'ALLOW_TO_FAILOVER'
backend_hostname1 = '192.168.7.177'
backend_port1 = 1921
backend_weight1 = 1
backend_flag1 = 'ALLOW_TO_FAILOVER'
enable_pool_hba = on
pool_passwd = 'pool_passwd'
authentication_timeout = 60
ssl = off
num_init_children = 32
max_pool = 4
child_life_time = 300
child_max_connections = 0
connection_life_time = 0
client_idle_limit = 0
log_destination = 'syslog'
print_timestamp = on
log_connections = on
log_hostname = off
# 以下两个参数用于调试, 能看到sql balance的情况.
log_statement = on
log_per_node_statement = on
log_standby_delay = 'always'
syslog_facility = 'LOCAL0'
syslog_ident = 'pgpool'
debug_level = 0
pid_file_name = '/home/itm_pg/pgpool/pgpool.pid'
logdir = '/tmp'
connection_cache = on
reset_query_list = 'ABORT; DISCARD ALL'
replication_mode = off
replicate_select = off
insert_lock = off
lobj_lock_table = ''
replication_stop_on_mismatch = off
failover_if_affected_tuples_mismatch = off
load_balance_mode = on
ignore_leading_white_space = on
white_function_list = ''
black_function_list = 'currval,lastval,nextval,setval'
master_slave_mode = on
master_slave_sub_mode = 'stream'
sr_check_period = 2
sr_check_user = 'srcheck'
sr_check_password = 'SRCHECK'
delay_threshold = 1024000
follow_master_command = ''
parallel_mode = off
pgpool2_hostname = ''
health_check_period = 0
health_check_timeout = 20
health_check_user = 'nobody'
health_check_password = ''
health_check_max_retries = 0
health_check_retry_delay = 1
failover_command = ''
failback_command = ''
fail_over_on_backend_error = on
search_primary_node_timeout = 10
recovery_user = 'nobody'
recovery_password = ''
recovery_1st_stage_command = ''
recovery_2nd_stage_command = ''
recovery_timeout = 90
client_idle_limit_in_recovery = 0
use_watchdog = off
trusted_servers = ''
ping_path = '/bin'
wd_hostname = ''
wd_port = 9000
wd_authkey = ''
delegate_IP = ''
ifconfig_path = '/sbin'
if_up_cmd = 'ifconfig eth0:0 inet $_IP_$ netmask 255.255.255.0'
if_down_cmd = 'ifconfig eth0:0 down'
arping_path = '/usr/sbin' # arping command path
arping_cmd = 'arping -U $_IP_$ -w 1'
clear_memqcache_on_escalation = on
wd_escalation_command = ''
wd_lifecheck_method = 'heartbeat'
wd_interval = 10
wd_heartbeat_port = 9694
wd_heartbeat_keepalive = 2
wd_heartbeat_deadtime = 30
heartbeat_destination0 = 'host0_ip1'
heartbeat_destination_port0 = 9694
heartbeat_device0 = ''
wd_life_point = 3
wd_lifecheck_query = 'SELECT 1'
wd_lifecheck_dbname = 'template1'
wd_lifecheck_user = 'nobody'
wd_lifecheck_password = ''
relcache_expire = 0
relcache_size = 256
check_temp_table = on
memory_cache_enabled = off
memqcache_method = 'shmem'
memqcache_memcached_host = 'localhost'
memqcache_memcached_port = 11211
memqcache_total_size = 67108864
memqcache_max_num_cache = 1000000
memqcache_expire = 0
memqcache_auto_cache_invalidation = on
memqcache_maxcache = 409600
memqcache_cache_block_size = 1048576
memqcache_oiddir = '//home/itm_pg/pgpool/oiddir'
white_memqcache_table_list = ''
black_memqcache_table_list = ''
生成pgpool管理秘钥, 并配置:
itm_pg@docker-> /home/itm_pg/pgpool/bin/pg_md5 -u sup_pool sup_pool_pwd
c21777db255631573e4233403773bb3b
itm_pg@docker-> vi pcp.conf
配置pgpool pool_hba.conf:
itm_pg@docker-> vi pool_hba.conf
# trust会导致错误
local all all trust
host all all 127.0.0.1/32 trust
host all all 0.0.0.0/0 md5
配置pgpool-ii密码文件, 从postgresql数据库pg_authid获取：
postgres=# select rolname,rolpassword from pg_authid;
rolname | rolpassword
----------------------+-------------------------------------
pg_monitor |
pg_read_all_settings |
pg_read_all_stats |
pg_stat_scan_tables |
pg_signal_backend |
osdba | md53b95a76d6aa5d605770a53120673337b
postgres | md53175bce1d3201d16594cebf9d7eb3f9d
(7 rows)
itm_pg@docker-> vi pool_passwd
postgres:md53175bce1d3201d16594cebf9d7eb3f9d
创建check用户，pgpool用它连接数据库并检查数据库是否正常：
itm_pg@docker-> psql
psql (10.3)
Type "help" for help.
postgres=# create role srcheck nosuperuser login encrypted password 'SRCHECK';
CREATE ROLE
启动pgpool：
itm_pg@docker-> /home/itm_pg/pgpool/bin/pgpool -f pgpool.conf
至此，流复制模式的pgpool-ll搭建完成！
