pgpool 3.7.5 環境搭建

阿新 • • 發佈：2018-12-17

配置環境變數

vim /etc/profile

末尾增加：

export PG_DATA=/opt/postgresql/data/pg96

export PG_HOME=/opt/postgresql/pg96

export PATH=$PG_HOME/bin/:$PATH

使環境變數生效

source /etc/profile

截圖如下：

配置/etc/hosts

vim /etc/hosts

增加如下：

10.33.26.118 master

10.33.26.119 slave

10.33.26.117 vip

截圖如下：

安裝pgpool

cd /opt

rpm -ivh libevent-2.0.21-4.el7.x86_64.rpm

rpm -ivh libmemcached-1.0.16-5.el7.x86_64.rpm

rpm -ivh pgpool-II-pg96-3.7.5-1pgdg.rhel7.x86_64.rpm

更改/etc/pgpool-II所有者為postgres

chown -R postgres:postgres /etc/pgpool-II/

安裝net-tools

rpm -ivh net-tools-2.0-0.22.20131004git.el7.x86_64.rpm

授權ifconfig, 讓普通使用者可以使用ifconfig

chmod u+s /sbin/ifconfig

chmod u+s /usr/sbin

mkdir /opt/pgpool

chown -R postgres:postgres /opt/pgpool

設定postgres密碼

passwd postgres --請設定為[email protected]++, 以便日後問題排查

切換到postgres使用者，配置免密碼登陸

su postgres

cd ~

ssh-keygen -t rsa

ssh-copy-id -i ~/.ssh/id_rsa.pub

[email protected]

ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]

配置pool_hba.conf

cd /etc/pgpool-II

vim pool_hba.conf

host all all 0.0.0.0/0 md5

截圖如下：

配置pgpool.conf

修改主，備主的pgpool.conf, 將eno16777736 改成網絡卡名稱， 10.33.26.117 改成 vip地址

然後將主的pgpool.conf檔案上傳至 10.33.26.118 的/etc/pgpool-II目錄，將備的pgpool.conf檔案上傳至 10.33.26.119 的/etc/pgpool-II目錄，覆蓋原來的檔案

配置pgpool.conf

vim pcp.conf

增加一行：

postgres:e8a48653851e28c69d0506508fb27fc5

截圖如下：

pg_md5 -p -m -u postgres pool_passwd

輸入postgres

上傳failover_stream.sh到/opt/pgpool

mkdir /var/log/pgpool

mkdir /var/run/postgresql

mkdir /var/run/pgpool

chown -R postgres:postgres /var/log/pgpool

chown -R postgres:postgres /var/run/postgresql

chown -R postgres:postgres /var/run/pgpool

chown -R postgres:postgres /opt/postgresql

chown postgres:postgres /opt/pgpool/failover_stream.sh

chmod 777 /opt/pgpool/failover_stream.sh

增加pg動態庫

vi /etc/ld.so.conf

/opt/postgresql/pg96/lib

截圖如下：

ldconfig

ldconfig -p

切換到postgres使用者，啟動pgpool

su postgres

pgpool -n -d -D > /opt/pgpool/pgpool.log 2>&1 &

檢視啟動是否正常：

tail -f /opt/pgpool/pgpool.log

檢視pg叢集狀態（10.33.26.118）

psql -h vip -p 9999

密碼是postgres

show pool_nodes

若出現如下，則代表配置成功

若主機掛掉或者網路異常時， pgpool會做主備切換，原來的主機（primary）變成備機(standby), 並且狀態改成了down, 如下圖所示：

將down的伺服器重新加入pgpool管理

先停止down掉伺服器上的pgpool和postgresql服務

pgpool -m fast stop

pg_ctl stop -D $PG_DATA

檢查主機pg_hba.conf檔案，紅框中應該改成從機IP

vim $PG_DATA/pg_hba.conf

pg_ctl reload -D $PG_DATA

檢查從機的postgresql.conf

vim $PG_DATA/postgresql.conf

是否有hot_standby = on 配置

pg_rewind --target-pgdata $PG_DATA --source-server='host=10.33.26.119 port=5432 user=postgres dbname=postgres password=postgres' -P

若如下現下圖所示，則代表恢復成功。

，

若出現如下情況，

則需要修改配置檔案postgresql.conf增加兩個引數，如下圖所示：

vim /opt/postgresql/data/pg96/postgresql.conf

wal_log_hints=on

full_page_writes = on

，

然後重啟服務：

/opt/postgresql/pg96/bin/pg_ctl start -D /opt/postgresql/data/pg96

/opt/postgresql/pg96/bin/pg_ctl stop -m fast -D /opt/postgresql/data/pg96

再執行

/opt/postgresql/pg96/bin/pg_rewind --target-pgdata /opt/postgresql/data/pg96 --source-server='host=10.33.26.119 port=5432 user=postgres dbname=postgres password=postgres' -P

vim $PG_DATA/recovery.conf

standby_mode = on # 說明該節點是從伺服器

primary_conninfo = 'host=10.33.26.119 port=5432 user=replica password=replica' # 主伺服器的資訊以及連線的使用者

recovery_target_timeline = 'latest'

截圖如下：

啟動postgresql服務

pg_ctl start -D $PG_DATA

檢視postgresql主從複製是否成功

select client_addr,sync_state from pg_stat_replication;

啟動pgpool服務

pgpool -n -d -D > /opt/pgpool/pgpool.log 2>&1 &

重新加入pgpool叢集

如果讓master重新加入，執行pcp_attach_node -d -U postgres -h vip -p 9898 -n 0

如果slave重新加入，執行pcp_attach_node -d -U postgres -h vip -p 9898 -n 1

檢視是否加入叢集：

psql -h vip -p 9999

show pool_nodes;

若無法加入叢集：

重啟pgpool

pgpool -m fast stop

pgpool -n -d -D > /opt/pgpool/pgpool.log 2>&1 &

若自動切換失敗，則需要手動切換，切換命令為

pg_ctl promote -D $PG_DATA

pgpool.conf 主：

# ---------------------------- # pgPool-II configuration file # ---------------------------- # # This file consists of lines of the form: # # name = value # # Whitespace may be used. Comments are introduced with "#" anywhere on a line. # The complete list of parameter names and allowed values can be found in the # pgPool-II documentation. # # This file is read on server startup and when the server receives a SIGHUP # signal. If you edit the file on a running system, you have to SIGHUP the # server for the changes to take effect, or use "pgpool reload". Some # parameters, which are marked below, require a server shutdown and restart to # take effect. #

#------------------------------------------------------------------------------ # CONNECTIONS #------------------------------------------------------------------------------

# - pgpool Connection Settings -

listen_addresses = '*' # Host name or IP address to listen on: # '*' for all, '' for no TCP/IP connections # (change requires restart) port = 9999 # Port number # (change requires restart) socket_dir = '/var/run/postgresql' # Unix domain socket path # The Debian package defaults to # /var/run/postgresql # (change requires restart) listen_backlog_multiplier = 2 # Set the backlog parameter of listen(2) to # num_init_children * listen_backlog_multiplier. # (change requires restart) serialize_accept = off # whether to serialize accept() call to avoid thundering herd problem # (change requires restart)

# - pgpool Communication Manager Connection Settings -

pcp_listen_addresses = '*' # Host name or IP address for pcp process to listen on: # '*' for all, '' for no TCP/IP connections # (change requires restart) pcp_port = 9898 # Port number for pcp # (change requires restart) pcp_socket_dir = '/var/run/postgresql' # Unix domain socket path for pcp # The Debian package defaults to # /var/run/postgresql # (change requires restart)

# - Backend Connection Settings -

backend_hostname0 = 'master' # Host name or IP address to connect to for backend 0 backend_port0 = 5432 # Port number for backend 0 backend_weight0 = 1 # Weight for backend 0 (only in load balancing mode) backend_data_directory0 = '/opt/postgresql/data' # Data directory for backend 0 backend_flag0 = 'ALLOW_TO_FAILOVER' # Controls various backend behavior # ALLOW_TO_FAILOVER or DISALLOW_TO_FAILOVER backend_hostname1 = 'slave' backend_port1 = 5432 backend_weight1 = 1 backend_data_directory1 = '/opt/postgresql/data' backend_flag1 = 'ALLOW_TO_FAILOVER'

# - Authentication -

enable_pool_hba = on # Use pool_hba.conf for client authentication pool_passwd = 'pool_passwd' # File name of pool_passwd for md5 authentication. # "" disables pool_passwd. # (change requires restart) authentication_timeout = 60 # Delay in seconds to complete client authentication # 0 means no timeout.

# - SSL Connections -

ssl = off # Enable SSL support # (change requires restart) #ssl_key = './server.key' # Path to the SSL private key file # (change requires restart) #ssl_cert = './server.cert' # Path to the SSL public certificate file # (change requires restart) #ssl_ca_cert = '' # Path to a single PEM format file # containing CA root certificate(s) # (change requires restart) #ssl_ca_cert_dir = '' # Directory containing CA root certificate(s) # (change requires restart)

#------------------------------------------------------------------------------ # POOLS #------------------------------------------------------------------------------

# - Concurrent session and pool size -

num_init_children = 32 # Number of concurrent sessions allowed # (change requires restart) max_pool = 4 # Number of connection pool caches per connection # (change requires restart)

# - Life time -

child_life_time = 300 # Pool exits after being idle for this many seconds child_max_connections = 0 # Pool exits after receiving that many connections # 0 means no exit connection_life_time = 0 # Connection to backend closes after being idle for this many seconds # 0 means no close client_idle_limit = 0 # Client is disconnected after being idle for that many seconds # (even inside an explicit transactions!) # 0 means no disconnection

#------------------------------------------------------------------------------ # LOGS #------------------------------------------------------------------------------

# - Where to log -

log_destination = 'stderr' # Where to log # Valid values are combinations of stderr, # and syslog. Default to stderr.

# - What to log -

log_line_prefix = '%t: pid %p: ' # printf-style string to output at beginning of each log line.

log_connections = off # Log connections log_hostname = off # Hostname will be shown in ps status # and in logs if connections are logged log_statement = off # Log all statements log_per_node_statement = off # Log all statements # with node and backend informations log_standby_delay = 'none' # Log standby delay # Valid values are combinations of always, # if_over_threshold, none

# - Syslog specific -

syslog_facility = 'LOCAL0' # Syslog local facility. Default to LOCAL0 syslog_ident = 'pgpool' # Syslog program identification string # Default to 'pgpool'

# - Debug -

debug_level = 0 # Debug message verbosity level # 0 means no message, 1 or more mean verbose

#log_error_verbosity = default # terse, default, or verbose messages

#client_min_messages = notice # values in order of decreasing detail: # debug5 # debug4 # debug3 # debug2 # debug1 # log # notice # warning # error

#log_min_messages = warning # values in order of decreasing detail: # debug5 # debug4 # debug3 # debug2 # debug1 # info # notice # warning # error # log # fatal # panic

#------------------------------------------------------------------------------ # FILE LOCATIONS #------------------------------------------------------------------------------

pid_file_name = '/var/run/pgpool/pgpool.pid' # PID file name # (change requires restart) logdir = '/var/log/pgpool' # Directory of pgPool status file # (change requires restart)

#------------------------------------------------------------------------------ # CONNECTION POOLING #------------------------------------------------------------------------------

connection_cache = on # Activate connection pools # (change requires restart)

# Semicolon separated list of queries # to be issued at the end of a session # The default is for 8.3 and later reset_query_list = 'ABORT; DISCARD ALL' # The following one is for 8.2 and before #reset_query_list = 'ABORT; RESET ALL; SET SESSION AUTHORIZATION DEFAULT'

#------------------------------------------------------------------------------ # REPLICATION MODE #------------------------------------------------------------------------------

replication_mode = off # Activate replication mode # (change requires restart) replicate_select = off # Replicate SELECT statements # when in replication mode # replicate_select is higher priority than # load_balance_mode.

insert_lock = on # Automatically locks a dummy row or a table # with INSERT statements to keep SERIAL data # consistency # Without SERIAL, no lock will be issued lobj_lock_table = '' # When rewriting lo_creat command in # replication mode, specify table name to # lock

# - Degenerate handling -

replication_stop_on_mismatch = off # On disagreement with the packet kind # sent from backend, degenerate the node # which is most likely "minority" # If off, just force to exit this session

failover_if_affected_tuples_mismatch = off # On disagreement with the number of affected # tuples in UPDATE/DELETE queries, then # degenerate the node which is most likely # "minority". # If off, just abort the transaction to # keep the consistency

#------------------------------------------------------------------------------ # LOAD BALANCING MODE #------------------------------------------------------------------------------

load_balance_mode = on # Activate load balancing mode # (change requires restart) ignore_leading_white_space = on # Ignore leading white spaces of each query white_function_list = '' # Comma separated list of function names # that don't write to database # Regexp are accepted black_function_list = 'nextval,setval,nextval,setval' # Comma separated list of function names # that write to database # Regexp are accepted

database_redirect_preference_list = '' # comma separated list of pairs of database and node id. # example: postgres:primary,mydb[0-4]:1,mydb[5-9]:2' # valid for streaming replicaton mode only.

app_name_redirect_preference_list = '' # comma separated list of pairs of app name and node id. # example: 'psql:primary,myapp[0-4]:1,myapp[5-9]:standby' # valid for streaming replicaton mode only. allow_sql_comments = off # if on, ignore SQL comments when judging if load balance or # query cache is possible. # If off, SQL comments effectively prevent the judgment # (pre 3.4 behavior).

#------------------------------------------------------------------------------ # MASTER/SLAVE MODE #------------------------------------------------------------------------------

master_slave_mode = on # Activate master/slave mode # (change requires restart) master_slave_sub_mode = 'stream' # Master/slave sub mode # Valid values are combinations slony or # stream. Default is slony. # (change requires restart)

# - Streaming -

sr_check_period = 5 # Streaming replication check period # Disabled (0) by default sr_check_user = 'replica' # Streaming replication check user # This is necessary even if you disable # streaming replication delay check with # sr_check_period = 0 sr_check_password = 'replica' # Password for streaming replication check user sr_check_database = 'postgres' # Database name for streaming replication check delay_threshold = 0 # Threshold before not dispatching query to standby node # Unit is in bytes # Disabled (0) by default

# - Special commands -

follow_master_command = '' # Executes this command after master failover # Special values: # %d = node id # %h = host name # %p = port number # %D = database cluster path # %m = new master node id # %H = hostname of the new master node # %M = old master node id # %P = old primary node id # %r = new master port number # %R = new master database cluster path # %% = '%' character

#------------------------------------------------------------------------------ # HEALTH CHECK #------------------------------------------------------------------------------

health_check_period = 10 # Health check period # Disabled (0) by default health_check_timeout = 20 # Health check timeout # 0 means no timeout health_check_user = 'postgres' # Health check user health_check_password = 'postgres' # Password for health check user health_check_database = 'postgres' # Database name for health check. If '', tries 'postgres' frist, then 'template1'

health_check_max_retries = 0 # Maximum number of times to retry a failed health check before giving up. health_check_retry_delay = 1 # Amount of time to wait (in seconds) between retries. connect_timeout = 10000 # Timeout value in milliseconds before giving up to connect to backend. # Default is 10000 ms (10 second). Flaky network user may want to increase # the value. 0 means no timeout. # Note that this value is not only used for health check, # but also for ordinary conection to backend.

#------------------------------------------------------------------------------ # FAILOVER AND FAILBACK #------------------------------------------------------------------------------

failover_command = '/opt/pgpool/failover_stream.sh %d %P %H %R' # Executes this command at failover # Special values: # %d = node id # %h = host name # %p = port number # %D = database cluster path # %m = new master node id # %H = hostname of the new master node # %M = old master node id # %P = old primary node id # %r = new master port number # %R = new master database cluster path # %% = '%' character failback_command = '' # Executes this command at failback. # Special values: # %d = node id # %h = host name # %p = port number # %D = database cluster path # %m = new master node id # %H = hostname of the new master node # %M = old master node id # %P = old primary node id # %r = new master port number # %R = new master database cluster path # %% = '%' character

fail_over_on_backend_error = on # Initiates failover when reading/writing to the # backend communication socket fails # If set to off, pgpool will report an # error and disconnect the session.

search_primary_node_timeout = 300 # Timeout in seconds to search for the # primary node when a failover occurs. # 0 means no timeout, keep searching # for a primary node forever.

#------------------------------------------------------------------------------ # ONLINE RECOVERY #------------------------------------------------------------------------------

recovery_user = 'nobody' # Online recovery user recovery_password = '' # Online recovery password recovery_1st_stage_command = '' # Executes a command in first stage recovery_2nd_stage_command = '' # Executes a command in second stage recovery_timeout = 90 # Timeout in seconds to wait for the # recovering node's postmaster to start up # 0 means no wait client_idle_limit_in_recovery = 0 # Client is disconnected after being idle # for that many seconds in the second stage # of online recovery # 0 means no disconnection # -1 means immediate disconnection

#------------------------------------------------------------------------------ # WATCHDOG #------------------------------------------------------------------------------

# - Enabling -

use_watchdog = on # Activates watchdog # (change requires restart)

# -Connection to up stream servers -

trusted_servers = '' # trusted server list which are used # to confirm network connection # (hostA,hostB,hostC,...) # (change requires restart) ping_path = '/bin' # ping command path # (change requires restart)

# - Watchdog communication Settings -

wd_hostname = 'master' # Host name or IP address of this watchdog # (change requires restart) wd_port = 9000 # port number for watchdog service # (change requires restart) wd_priority = 1 # priority of this watchdog in leader election # (change requires restart)

wd_authkey = '' # Authentication key for watchdog communication # (change requires restart)

wd_ipc_socket_dir = '/var/run/postgresql' # Unix domain socket path for watchdog IPC socket # The Debian package defaults to # /var/run/postgresql # (change requires restart)

# - Virtual IP control Setting -

delegate_IP = '10.33.26.117' # delegate IP address # If this is empty, virtual IP never bring up. # (change requires restart) if_cmd_path = '/sbin' # path to the directory where if_up/down_cmd exists # (change requires restart) if_up_cmd = 'ifconfig ens33:0 inet 10.33.26.117 netmask 255.255.255.0' # startup delegate IP command # (change requires restart) if_down_cmd = 'ifconfig ens33:0 down' # shutdown delegate IP command # (change requires restart) arping_path = '/usr/sbin' # arping command path # (change requires restart) arping_cmd = 'arping -U 10.33.26.117 -w 1' # arping command # (change requires restart)

# - Behaivor on escalation Setting -

clear_memqcache_on_escalation = on # Clear all the query cache on shared memory # when standby pgpool escalate to active pgpool # (= virtual IP holder). # This should be off if client connects to pgpool # not using virtual IP. # (change requires restart) wd_escalation_command = '' # Executes this command at escalation on new active pgpool. # (change requires restart) wd_de_escalation_command = '' # Executes this command when master pgpool resigns from being master. # (change requires restart)

# - Lifecheck Setting -

# -- common --

wd_monitoring_interfaces_list = '' # Comma separated list of interfaces names to monitor. # if any interface from the list is active the watchdog will # consider the network is fine # 'any' to enable monitoring on all interfaces except loopback # '' to disable monitoring

wd_lifecheck_method = 'heartbeat' # Method of watchdog lifecheck ('heartbeat' or 'query' or 'external') # (change requires restart) wd_interval = 10 # lifecheck interval (sec) > 0 # (change requires restart)

# -- heartbeat mode --

wd_heartbeat_port = 9694 # Port number for receiving heartbeat signal # (change requires restart) wd_heartbeat_keepalive = 2 # Interval time of sending heartbeat signal (sec) # (change requires restart) wd_heartbeat_deadtime = 30 # Deadtime interval for heartbeat signal (sec) # (change requires restart) heartbeat_destination0 = 'slave' # Host name or IP address of destination 0 # for sending heartbeat signal. # (change requires restart) heartbeat_destination_port0 = 9694 # Port number of destination 0 for sending # heartbeat signal. Usually this is the # same as wd_heartbeat_port. # (change requires restart) heartbeat_device0 = 'ens33' # Name of NIC device (such like 'eth0') # used for sending/receiving heartbeat # signal to/from destination 0. # This works only when this is not empty # and pgpool has root privilege. # (change requires restart)

#heartbeat_destination1 = 'host0_ip2' #heartbeat_destination_port1 = 9694 #heartbeat_device1 = ''

# -- query mode --

wd_life_point = 3 # lifecheck retry times # (change requires restart) wd_lifecheck_query = 'SELECT 1' # lifecheck query to pgpool from watchdog # (change requires restart) wd_lifecheck_dbname = 'template1' # Database name connected for lifecheck # (change requires restart) wd_lifecheck_user = 'nobody' # watchdog user monitoring pgpools in lifecheck # (change requires restart) wd_lifecheck_password = '' # Password for watchdog user in lifecheck # (change requires restart)

# - Other pgpool Connection Settings -

other_pgpool_hostname0 = 'slave' # Host name or IP address to connect to for other pgpool 0 # (change requires restart) other_pgpool_port0 = 9999 # Port number for othet pgpool 0 # (change requires restart) other_wd_port0 = 9000 # Port number for othet watchdog 0 # (change requires restart) #other_pgpool_hostname1 = 'host1' #other_pgpool_port1 = 5432 #other_wd_port1 = 9000

#------------------------------------------------------------------------------ # OTHERS #------------------------------------------------------------------------------ relcache_expire = 0 # Life time of relation cache in seconds. # 0 means no cache expiration(the default). # The relation cache is used for cache the # query result against PostgreSQL system # catalog to obtain various information # including table structures or if it's a # temporary table or not. The cache is # maintained in a pgpool child local memory # and being kept as long as it survives. # If someone modify the table by using # ALTER TABLE or some such, the relcache is # not consistent anymore. # For this purpose, cache_expiration # controls the life time of the cache.

relcache_size = 256 # Number of relation cache # entry. If you see frequently: # "pool_search_relcache: cache replacement happend" # in the pgpool log, you might want to increate this number.

check_temp_table = on # If on, enable temporary table check in SELECT statements. # This initiates queries against system catalog of primary/master # thus increases load of master. # If you are absolutely sure that your system never uses temporary tables # and you want to save access to primary/master, you could turn this off. # Default is on.

check_unlogged_table = on # If on, enable unlogged table check in SELECT statements. # This initiates queries against system catalog of primary/master # thus increases load of master. # If you are absolutely sure that your system never uses unlogged tables # and you want to save access to primary/master, you could turn this off. # Default is on.

#------------------------------------------------------------------------------ # IN MEMORY QUERY MEMORY CACHE #------------------------------------------------------------------------------ memory_cache_enabled = off # If on, use the memory cache functionality, off by default memqcache_method = 'shmem' # Cache storage method. either 'shmem'(shared memory) or # 'memcached'. 'shmem' by default # (change requires restart) memqcache_memcached_host = 'localhost' # Memcached host name or IP address. Mandatory if # memqcache_method = 'memcached'. # Defaults to localhost. # (change requires restart) memqcache_memcached_port = 11211 # Memcached port number. Mondatory if memqcache_method = 'memcached'. # Defaults to 11211. # (change requires restart) memqcache_total_size = 67108864 # Total memory size in bytes for storing memory cache. # Mandatory if memqcache_method = 'shmem'. # Defaults to 64MB. # (change requires restart) memqcache_max_num_cache = 1000000 # Total number of cache entries. Mandatory # if memqcache_method = 'shmem'. # Each cache entry consumes 48 bytes on shared memory. # Defaults to 1,000,000(45.8MB). # (change requires restart) memqcache_expire = 0 # Memory cache entry life time specified in seconds. # 0 means infinite life time. 0 by default. # (change requires restart) memqcache_auto_cache_invalidation = on # If on, invalidation of query cache is triggered by corresponding # DDL/DML/DCL(and memqcache_expire). If off, it is only triggered # by memqcache_expire. on by default. # (change requires restart) memqcache_maxcache = 409600 # Maximum SELECT result size in bytes. # Must be smaller than memqcache_cache_block_size. Defaults to 400KB. # (change requires restart) memqcache_cache_block_size = 1048576 # Cache block size in bytes. Mandatory if memqcache_method = 'shmem'. # Defaults to 1MB. # (change requires restart) memqcache_oiddir = '/var/log/pgpool/oiddir' # Temporary work directory to record table oids # (change requires restart) white_memqcache_table_list = '' # Comma separated list of table names to memcache # that don't write to database # Regexp are accepted black_memqcache_table_list = '' # Comma separated list of table names not to memcache # that don't write to database # Regexp are accepted

pgpool.conf 從

#------------------------------------------------------------------------------ # CONNECTIONS #------------------------------------------------------------------------------

# - pgpool Connection Settings -

# - pgpool Communication Manager Connection Settings -

# - Backend Connection Settings -

# - Authentication -

# - SSL Connections -

#------------------------------------------------------------------------------ # POOLS #------------------------------------------------------------------------------

# - Concurrent session and pool size -

num_init_children = 32 # Number of concurrent sessions allowed # (change requires restart) max_pool = 4 # Number of connection pool caches per connection # (change requires restart)

# - Life time -

#------------------------------------------------------------------------------ # LOGS #------------------------------------------------------------------------------

# - Where to log -

log_destination = 'stderr' # Where to log # Valid values are combinations of stderr, # and syslog. Default to stderr.

# - What to log -

log_line_prefix =

pgpool 3.7.5 環境搭建

pgpool 3.7.5 環境搭建

Python3.7、Eclipse 4.5、 Java 8、 PyDev 5.2.0、 selenium-3.14.0環境搭建

Linux鞏固記錄（3） hadoop 2.7.4 環境搭建

Idea+Centos+hadoop-2.7.3源碼環境搭建

在 CentOS 7.2 下安裝 Hadoop 2.7.5 並搭建偽分散式環境的方法

新手上路——hadoop2.7.3單機模式環境搭建

CentOS 7下Hbase1.3.1分散式環境搭建

hadoop2.7.3 HA YARN 環境搭建

windows8.1+python2.7+selenium環境搭建

python2.7.13環境搭建

Appium1.6.5環境搭建

windows python2,3,pip2,pip3環境搭建

Java學習不走彎路教程（7.Eclipse環境搭建）

py3 pyvenv（py3自帶的虛擬環境工具）odoo12c py3.7 venv環境搭建記錄

CentOS 7.5環境安裝Vagrant詳解

Hadoop從入門到精通系列之--3.完全分散式環境搭建

【開發工具】【Java開發工具 iedaiu-2017.3】【環境搭建】

PyQt4+Python2.7+PyCharm環境搭建及第一個小程式

自動化測試之路3-selenium3+python3環境搭建！

第3章實戰環境搭建

pgpool 3.7.5 環境搭建

相關推薦