标签：数据库软件 操作系统 ubuntu postgresql 主从配置
操作系统版本 Ubuntu 14.04
数据库软件版本 postgresql-9.4.7.tar.gz
安装方式 编译安装
软件安装目录 /usr/local/pgsql
数据存放目录 /service/postgresql/data
日志存放目录 /service/postgresql/archive
1、安装依赖包
sudo apt-get update
sudo apt-get install -y libreadline6-dev
sudo apt-get install -y lib1g-dev
sudo apt-get install -y openssl
sudo apt-get install -y libssl-dev
sudo apt-get install -y libpam-dev
sudo apt-get install -y libxml2-dev
sudo apt-get install -y libxslt1-dev
sudo apt-get install -y tcl-dev
sudo apt-get install -y libperl-dev
sudo apt-get install -y python-dev
2、编译安装软件和第三方工具
cd /usr/local/src
sudo wget https://ftp.postgresql.org/pub/source/v9.4.7/postgresql-9.4.7.tar.gz
sudo tar xf postgresql-9.4.7.tar.gz
cd postgresql-9.4.7
./configure\
--prefix=/usr/local/pgsql\
--with-pgport=5432\
--with-perl\
--with-tcl\
--with-python\
--with-openssl\
--with-pam\
--without-ldap\
--with-libxml\
--with-libxslt\
--with-blocksize=8\
--enable-thread-safety
sudo make -j 4 && sudo make install
cd /usr/local/src/postgresql-9.4.7/contrib
sudo make -j 4
sudo make install
3、创建postgresql用户并设置密码 （密码需要记录）
sudo useradd postgres
sudo passwd postgres
4、创建目录并授权
sudo mkdir -p /home/postgres
sudo mkdir -p /service/postgresql/run/postgresql/9.4-main.pg_stat_tmp
sudo mkdir -p /service/postgresql/data
sudo mkdir -p /service/postgresql/archive
sudo chown -R postgres.postgres /home/postgres
sudo chown -R postgres.postgres /service/postgresql/run
sudo chown -R postgres.postgres /service/postgresql/data
sudo chown -R postgres.postgres /service/postgresql/archive
5、初始化数据库
su postgres
cd /usr/local/pgsql/bin/
./initdb -D /service/postgresql/data/ -E UTF-8 --locale=en_US.UTF-8
6、设置环境变量
vim ~/.bash_profile
PGLIB=/usr/local/pgsql/lib
PGDATA=/service/postgresql/data
PATH=$PATH:/usr/local/pgsql/bin:/usr/local/pgpool/bin
MANPATH=$MANPATH:/usr/local/pgsql/man
PGHOST=/service/postgresql/run/postgresql
export PGLIB PGDATA MANPATH PGHOST PATH
7、编辑配置文件
（1）修改主库的配置文件
vim /service/postgresql/data/postgresql.conf
# -----------------------------
# PostgreSQL configuration file
# -----------------------------
#
# This file consists of lines of the form:
#
# name = value
#
# (The "=" is optional.) 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 PostgreSQL documentation.
#
# The commented-out settings shown in this file represent the default values.
# Re-commenting a setting is NOT sufficient to revert it to the default value;
# you need to reload the server.
#
# 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 "pg_ctl reload". Some
# parameters, which are marked below, require a server shutdown and restart to
# take effect.
#
# Any parameter can also be given as a command-line option to the server, e.g.,
# "postgres -c log_connections=on". Some parameters can be changed at run time
# with the "SET" SQL command.
#
# Memory units: kB = kilobytes Time units: ms = milliseconds
# MB = megabytes s = seconds
# GB = gigabytes min = minutes
# TB = terabytes h = hours
# d = days
#------------------------------------------------------------------------------
# FILE LOCATIONS
#------------------------------------------------------------------------------
# The default values of these variables are driven from the -D command-line
# option or PGDATA environment variable, represented here as ConfigDir.
data_directory = ‘/service/postgresql/data‘ # use data in another directory
# (change requires restart)
hba_file = ‘/service/postgresql/data/pg_hba.conf‘ # host-based authentication file
# (change requires restart)
ident_file = ‘/service/postgresql/data/pg_ident.conf‘ # ident configuration file
# (change requires restart)
# If external_pid_file is not explicitly set, no extra PID file is written.
external_pid_file = ‘/service/postgresql/run/postgresql/9.4-main.pid‘ # write an extra PID file
# (change requires restart)
#------------------------------------------------------------------------------
# CONNECTIONS AND AUTHENTICATION
#------------------------------------------------------------------------------
# - Connection Settings -
listen_addresses = ‘*‘ # what IP address(es) to listen on;
# comma-separated list of addresses;
# defaults to ‘localhost‘; use ‘*‘ for all
# (change requires restart)
port = 5432 # (change requires restart)
max_connections = 1000 # (change requires restart)
# Note: Increasing max_connections costs ~400 bytes of shared memory per
# connection slot, plus lock space (see max_locks_per_transaction).
#superuser_reserved_connections = 3 # (change requires restart)
#unix_socket_directories = ‘/tmp‘ # comma-separated list of directories
# (change requires restart)
unix_socket_directories = ‘/service/postgresql/run/postgresql‘
#unix_socket_group = ‘‘ # (change requires restart)
#unix_socket_permissions = 0777 # begin with 0 to use octal notation
# (change requires restart)
#bonjour = off # advertise server via Bonjour
# (change requires restart)
#bonjour_name = ‘‘ # defaults to the computer name
# (change requires restart)
# - Security and Authentication -
#authentication_timeout = 1min # 1s-600s
#ssl = off # (change requires restart)
#ssl_ciphers = ‘HIGH:MEDIUM:+3DES:!aNULL‘ # allowed SSL ciphers
# (change requires restart)
#ssl_prefer_server_ciphers = on # (change requires restart)
#ssl_ecdh_curve = ‘prime256v1‘ # (change requires restart)
#ssl_renegotiation_limit = 0 # amount of data between renegotiations
#ssl_cert_file = ‘server.crt‘ # (change requires restart)
#ssl_key_file = ‘server.key‘ # (change requires restart)
#ssl_ca_file = ‘‘ # (change requires restart)
#ssl_crl_file = ‘‘ # (change requires restart)
#password_encryption = on
#db_user_namespace = off
# GSSAPI using Kerberos
#krb_server_keyfile = ‘‘
#krb_caseins_users = off
# - TCP Keepalives -
# see "man 7 tcp" for details
#tcp_keepalives_idle = 0 # TCP_KEEPIDLE, in seconds;
# 0 selects the system default
#tcp_keepalives_interval = 0 # TCP_KEEPINTVL, in seconds;
# 0 selects the system default
#tcp_keepalives_count = 0 # TCP_KEEPCNT;
# 0 selects the system default
#------------------------------------------------------------------------------
# RESOURCE USAGE (except WAL)
#------------------------------------------------------------------------------
# - Memory -
shared_buffers = 1024MB # min 128kB
# (change requires restart)
#huge_pages = try # on, off, or try
# (change requires restart)
#temp_buffers = 8MB # min 800kB
#max_prepared_transactions = 0 # zero disables the feature
# (change requires restart)
max_prepared_transactions = 1500
# Note: Increasing max_prepared_transactions costs ~600 bytes of shared memory
# per transaction slot, plus lock space (see max_locks_per_transaction).
# It is not advisable to set max_prepared_transactions nonzero unless you
# actively intend to use prepared transactions.
work_mem = 4MB # min 64kB
maintenance_work_mem = 512MB # min 1MB
#autovacuum_work_mem = -1 # min 1MB, or -1 to use maintenance_work_mem
#max_stack_depth = 2MB # min 100kB
#dynamic_shared_memory_type = posix # the default is the first option
# supported by the operating system:
# posix
# sysv
# windows
# mmap
# use none to disable dynamic shared memory
# - Disk -
#temp_file_limit = -1 # limits per-session temp file space
# in kB, or -1 for no limit
# - Kernel Resource Usage -
#max_files_per_process = 1000 # min 25
# (change requires restart)
#shared_preload_libraries = ‘‘ # (change requires restart)
shared_preload_libraries = ‘pg_stat_statements‘ # (change requires restart)
pg_stat_statements.max = 10000
pg_stat_statements.track = all
# - Cost-Based Vacuum Delay -
#vacuum_cost_delay = 0 # 0-100 milliseconds
#vacuum_cost_page_hit = 1 # 0-10000 credits
#vacuum_cost_page_miss = 10 # 0-10000 credits
#vacuum_cost_page_dirty = 20 # 0-10000 credits
#vacuum_cost_limit = 200 # 1-10000 credits
# - Background Writer -
#bgwriter_delay = 200ms # 10-10000ms between rounds
#bgwriter_lru_maxpages = 100 # 0-1000 max buffers written/round
#bgwriter_lru_multiplier = 2.0 # 0-10.0 multipler on buffers scanned/round
# - Asynchronous Behavior -
#effective_io_concurrency = 1 # 1-1000; 0 disables prefetching
#max_worker_processes = 8
#------------------------------------------------------------------------------
# WRITE AHEAD LOG
#------------------------------------------------------------------------------
# - Settings -
wal_level = hot_standby # minimal, archive, hot_standby, or logical
# (change requires restart)
#fsync = on # turns forced synchronization on or off
#synchronous_commit = on # synchronization level;
# off, local, remote_write, or on
#wal_sync_method = fsync # the default is the first option
# supported by the operating system:
# open_datasync
# fdatasync (default on Linux)
# fsync
# fsync_writethrough
# open_sync
#full_page_writes = on # recover from partial page writes
#wal_log_hints = off # also do full page writes of non-critical updates
# (change requires restart)
#wal_buffers = -1 # min 32kB, -1 sets based on shared_buffers
# (change requires restart)
#wal_writer_delay = 200ms # 1-10000 milliseconds
#commit_delay = 0 # range 0-100000, in microseconds
#commit_siblings = 5 # range 1-1000
# - Checkpoints -
#checkpoint_segments = 3 # in logfile segments, min 1, 16MB each
#checkpoint_timeout = 5min # range 30s-1h
#checkpoint_completion_target = 0.5 # checkpoint target duration, 0.0 - 1.0
#checkpoint_warning = 30s # 0 disables
# - Archiving -
archive_mode = on # allows archiving to be done
# (change requires restart)
archive_command = ‘cp -i %p /service/postgresql/archive/%f </dev/null‘ # command to use to archive a logfile segment
# placeholders: %p = path of file to archive
# %f = file name only
# e.g. ‘test ! -f /mnt/server/archivedir/%f && cp %p /mnt/server/archivedir/%f‘
archive_timeout = 86400 # force a logfile segment switch after this
# number of seconds; 0 disables
#------------------------------------------------------------------------------
# REPLICATION
#------------------------------------------------------------------------------
# - Sending Server(s) -
# Set these on the master and on any standby that will send replication data.
max_wal_senders = 15 # max number of walsender processes
# (change requires restart)
wal_keep_segments = 100 # in logfile segments, 16MB each; 0 disables
#wal_sender_timeout = 60s # in milliseconds; 0 disables
#max_replication_slots = 0 # max number of replication slots
# (change requires restart)
# - Master Server -
# These settings are ignored on a standby server.
#synchronous_standby_names = ‘‘ # standby servers that provide sync rep
# comma-separated list of application_name
# from standby(s); ‘*‘ = all
#vacuum_defer_cleanup_age = 0 # number of xacts by which cleanup is delayed
# - Standby Servers -
# These settings are ignored on a master server.
#hot_standby = on # "on" allows queries during recovery
# (change requires restart)
#max_standby_archive_delay = 30s # max delay before canceling queries
# when reading WAL from archive;
# -1 allows indefinite delay
#max_standby_streaming_delay = 30s # max delay before canceling queries
# when reading streaming WAL;
# -1 allows indefinite delay
#wal_receiver_status_interval = 10s # send replies at least this often
# 0 disables
#hot_standby_feedback = off # send info from standby to prevent
# query conflicts
#wal_receiver_timeout = 60s # time that receiver waits for
# communication from master
# in milliseconds; 0 disables
#------------------------------------------------------------------------------
# QUERY TUNING
#------------------------------------------------------------------------------
# - Planner Method Configuration -
#enable_bitmapscan = on
#enable_hashagg = on
#enable_hashjoin = on
#enable_indexscan = on
#enable_indexonlyscan = on
#enable_material = on
#enable_mergejoin = on
#enable_nestloop = on
#enable_seqscan = on
#enable_sort = on
#enable_tidscan = on
# - Planner Cost Constants -
#seq_page_cost = 1.0 # measured on an arbitrary scale
#random_page_cost = 4.0 # same scale as above
#cpu_tuple_cost = 0.01 # same scale as above
#cpu_index_tuple_cost = 0.005 # same scale as above
#cpu_operator_cost = 0.0025 # same scale as above
effective_cache_size = 4GB
# - Genetic Query Optimizer -
#geqo = on
#geqo_threshold = 12
#geqo_effort = 5 # range 1-10
#geqo_pool_size = 0 # selects default based on effort
#geqo_generations = 0 # selects default based on effort
#geqo_selection_bias = 2.0 # range 1.5-2.0
#geqo_seed = 0.0 # range 0.0-1.0
# - Other Planner Options -
#default_statistics_target = 100 # range 1-10000
#constraint_exclusion = partition # on, off, or partition
#cursor_tuple_fraction = 0.1 # range 0.0-1.0
#from_collapse_limit = 8
#join_collapse_limit = 8 # 1 disables collapsing of explicit
# JOIN clauses
#------------------------------------------------------------------------------
# ERROR REPORTING AND LOGGING
#------------------------------------------------------------------------------
# - Where to Log -
#log_destination = ‘stderr‘ # Valid values are combinations of
# stderr, csvlog, syslog, and eventlog,
# depending on platform. csvlog
# requires logging_collector to be on.
# This is used when logging to stderr:
logging_collector = on # Enable capturing of stderr and csvlog
# into log files. Required to be on for
# csvlogs.
# (change requires restart)
# These are only used if logging_collector is on:
log_directory = ‘pg_log‘ # directory where log files are written,
# can be absolute or relative to PGDATA
log_filename = ‘postgresql-%Y-%m-%d_%H%M%S.log‘ # log file name pattern,
# can include strftime() escapes
log_file_mode = 0600 # creation mode for log files,
# begin with 0 to use octal notation
#log_truncate_on_rotation = off # If on, an existing log file with the
# same name as the new log file will be
# truncated rather than appended to.
# But such truncation only occurs on
# time-driven rotation, not on restarts
# or size-driven rotation. Default is
# off, meaning append to existing files
# in all cases.
log_rotation_age = 1d # Automatic rotation of logfiles will
# happen after that time. 0 disables.
log_rotation_size = 100MB # Automatic rotation of logfiles will
# happen after that much log output.
# 0 disables.
# These are relevant when logging to syslog:
#syslog_facility = ‘LOCAL0‘
#syslog_ident = ‘postgres‘
# This is only relevant when logging to eventlog (win32):
#event_source = ‘PostgreSQL‘
# - When to Log -
#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
#log_min_error_statement = error # values in order of decreasing detail:
# debug5
# debug4
# debug3
# debug2
# debug1
# info
# notice
# warning
# error
# log
# fatal
# panic (effectively off)
log_min_duration_statement = 2000 # -1 is disabled, 0 logs all statements
# and their durations, > 0 logs only
# statements running at least this number
# of milliseconds
# - What to Log -
#debug_print_parse = off
#debug_print_rewritten = off
#debug_print_plan = off
#debug_pretty_print = on
#log_checkpoints = off
#log_connections = off
#log_disconnections = off
#log_duration = off
#log_error_verbosity = default # terse, default, or verbose messages
#log_hostname = off
log_line_prefix = ‘%t [%p-%l] %q%u@%d ‘ # special values:
# %a = application name
# %u = user name
# %d = database name
# %r = remote host and port
# %h = remote host
# %p = process ID
# %t = timestamp without milliseconds
# %m = timestamp with milliseconds
# %i = command tag
# %e = SQL state
# %c = session ID
# %l = session line number
# %s = session start timestamp
# %v = virtual transaction ID
# %x = transaction ID (0 if none)
# %q = stop here in non-session
# processes
# %% = ‘%‘
# e.g. ‘<%u%%%d> ‘
#log_lock_waits = off # log lock waits >= deadlock_timeout
#log_statement = ‘none‘ # none, ddl, mod, all
#log_temp_files = -1 # log temporary files equal or larger
# than the specified size in kilobytes;
# -1 disables, 0 logs all temp files
log_timezone = ‘PRC‘
#------------------------------------------------------------------------------
# RUNTIME STATISTICS
#------------------------------------------------------------------------------
# - Query/Index Statistics Collector -
#track_activities = on
#track_counts = on
#track_io_timing = off
#track_functions = none # none, pl, all
#track_activity_query_size = 1024 # (change requires restart)
#update_process_title = on
#stats_temp_directory = ‘pg_stat_tmp‘
stats_temp_directory = ‘/var/run/postgresql/9.4-main.pg_stat_tmp‘
# - Statistics Monitoring -
#log_parser_stats = off
#log_planner_stats = off
#log_executor_stats = off
#log_statement_stats = off
#------------------------------------------------------------------------------
# AUTOVACUUM PARAMETERS
#------------------------------------------------------------------------------
#autovacuum = on # Enable autovacuum subprocess? ‘on‘
# requires track_counts to also be on.
#log_autovacuum_min_duration = -1 # -1 disables, 0 logs all actions and
# their durations, > 0 logs only
# actions running at least this number
# of milliseconds.
#autovacuum_max_workers = 3 # max number of autovacuum subprocesses
# (change requires restart)
#autovacuum_naptime = 1min # time between autovacuum runs
#autovacuum_vacuum_threshold = 50 # min number of row updates before
# vacuum
#autovacuum_analyze_threshold = 50 # min number of row updates before
# analyze
#autovacuum_vacuum_scale_factor = 0.2 # fraction of table size before vacuum
#autovacuum_analyze_scale_factor = 0.1 # fraction of table size before analyze
#autovacuum_freeze_max_age = 200000000 # maximum XID age before forced vacuum
# (change requires restart)
#autovacuum_multixact_freeze_max_age = 400000000 # maximum multixact age
# before forced vacuum
# (change requires restart)
#autovacuum_vacuum_cost_delay = 20ms # default vacuum cost delay for
# autovacuum, in milliseconds;
# -1 means use vacuum_cost_delay
#autovacuum_vacuum_cost_limit = -1 # default vacuum cost limit for
# autovacuum, -1 means use
# vacuum_cost_limit
#------------------------------------------------------------------------------
# CLIENT CONNECTION DEFAULTS
#------------------------------------------------------------------------------
# - Statement Behavior -
#search_path = ‘"$user",public‘ # schema names
#default_tablespace = ‘‘ # a tablespace name, ‘‘ uses the default
#temp_tablespaces = ‘‘ # a list of tablespace names, ‘‘ uses
# only default tablespace
#check_function_bodies = on
#default_transaction_isolation = ‘read committed‘
#default_transaction_read_only = off
#default_transaction_deferrable = off
#session_replication_role = ‘origin‘
#statement_timeout = 0 # in milliseconds, 0 is disabled
#lock_timeout = 0 # in milliseconds, 0 is disabled
#vacuum_freeze_min_age = 50000000
#vacuum_freeze_table_age = 150000000
#vacuum_multixact_freeze_min_age = 5000000
#vacuum_multixact_freeze_table_age = 150000000
#bytea_output = ‘hex‘ # hex, escape
#xmlbinary = ‘base64‘
#xmloption = ‘content‘
#gin_fuzzy_search_limit = 0
# - Locale and Formatting -
#datestyle = ‘iso, mdy‘
#intervalstyle = ‘postgres‘
#timezone = ‘GMT‘
#timezone_abbreviations = ‘Default‘ # Select the set of available time zone
# abbreviations. Currently, there are
# Default
# Australia (historical usage)
# India
# You can create your own file in
# share/timezonesets/.
#extra_float_digits = 0 # min -15, max 3
#client_encoding = sql_ascii # actually, defaults to database
# encoding
# These settings are initialized by initdb, but they can be changed.
#lc_messages = ‘C‘ # locale for system error message
# strings
#lc_monetary = ‘C‘ # locale for monetary formatting
#lc_numeric = ‘C‘ # locale for number formatting
#lc_time = ‘C‘ # locale for time formatting
# default configuration for text search
#default_text_search_config = ‘pg_catalog.simple‘
# - Other Defaults -
#dynamic_library_path = ‘$libdir‘
#local_preload_libraries = ‘‘
#session_preload_libraries = ‘‘
#------------------------------------------------------------------------------
# LOCK MANAGEMENT
#------------------------------------------------------------------------------
#deadlock_timeout = 1s
#max_locks_per_transaction = 64 # min 10
# (change requires restart)
# Note: Each lock table slot uses ~270 bytes of shared memory, and there are
# max_locks_per_transaction * (max_connections + max_prepared_transactions)
# lock table slots.
#max_pred_locks_per_transaction = 64 # min 10
# (change requires restart)
#------------------------------------------------------------------------------
# VERSION/PLATFORM COMPATIBILITY
#------------------------------------------------------------------------------
# - Previous PostgreSQL Versions -
#array_nulls = on
#backslash_quote = safe_encoding # on, off, or safe_encoding
#default_with_oids = off
#escape_string_warning = on
#lo_compat_privileges = off
#quote_all_identifiers = off
#sql_inheritance = on
#standard_conforming_strings = on
#synchronize_seqscans = on
# - Other Platforms and Clients -
#transform_null_equals = off
#------------------------------------------------------------------------------
# ERROR HANDLING
#------------------------------------------------------------------------------
#exit_on_error = off # terminate session on any error?
#restart_after_crash = on # reinitialize after backend crash?
#------------------------------------------------------------------------------
# CONFIG FILE INCLUDES
#------------------------------------------------------------------------------
# These options allow settings to be loaded from files other than the
# default postgresql.conf.
#include_dir = ‘conf.d‘ # include files ending in ‘.conf‘ from
# directory ‘conf.d‘
#include_if_exists = ‘exists.conf‘ # include file only if it exists
#include = ‘special.conf‘ # include file
#------------------------------------------------------------------------------
# CUSTOMIZED OPTIONS
#------------------------------------------------------------------------------
# Add settings for extensions here
vim /service/postgresql/data/pg_hba.conf
# TYPE DATABASE USER ADDRESS METHOD
# "local" is for Unix domain socket connections only
local all all trust
# IPv4 local connections:
host all all 127.0.0.1/32 trust
host all all 实际IP地址 md5
host all all 实际IP地址 md5
# IPv6 local connections:
host all all ::1/128 trust
# 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 repl 实际IP地址 trust
host replication repl 实际IP地址 trust
8、启动数据库
pg_ctl start
9、创建同步用户和数据库并授权
psql
CREATE USER repl WITH PASSWORD ‘root1234‘;
CREATE DATABASE db_repl;
GRANT ALL PRIVILEGES ON DATABASE db_repl to repl;
10、安装SLAVE数据库软件
注：不要初始化数据库，其它同样操作
11、配置ssh互信
主：
ssh-keygen
ssh-copy-id -i postgres@从库IP地址
从：
ssh-keygen
ssh-copy-id -i postgres@主库IP地址
12、备份主数据库
在主库上操作
psql -c "SELECT pg_start_backup(‘label‘, true)"
scp -r /service/postgresql/data/* postgres@从库IP地址:/service/postgresql/data/
psql -c "SELECT pg_stop_backup()"
13、编辑备库配置文件
vim /service/postgresql/data/postgresql.conf
改：#hot_standby = on
为： hot_standby = on
vim /service/postgresql/data/recovery.conf
recovery_target_timeline = ‘latest‘
standby_mode = ‘on‘
primary_conninfo = ‘host=实际主库IP地址 port=5432 user=repl password=root1234‘
trigger_file = ‘/service/postgresql/data/pg_root/postgresql.trigger.1921‘
14、启动备库
su postgres
pg_ctl start
15、检查同步
在主库上操作以下步骤
psql
select * from pg_stat_replication;
本文出自 “zllcto” 博客，谢绝转载！
标签：数据库软件 操作系统 ubuntu postgresql 主从配置
原文地址：http://zllcto.blog.51cto.com/10456101/1853321
