1.下载plproxy-2.6.tar.gz

网址：https://plproxy.github.io/

root用户上传到 /home/soft目录

# cd /home/

# chown postgres.postgres soft

# cd soft

# chown postgres.postgres plproxy-2.6.tar.gz

2.编译安装

前提：postgresql 9.5.2源码安装，/opt/pgsql/9.5.2

postgres用户PATH环境变量

[postgres@pgtest ~]$ more .bash_profile 

# .bash_profile

# Get the aliases and functions

if [ -f ~/.bashrc ]; then

        . ~/.bashrc

fi

# User specific environment and startup programs

export LD_LIBRARY_PATH=/usr/local/mysql/lib/mysql:/opt/pgsql/9.5.2/lib

export PATH=/usr/local/mysql/bin:/opt/pgbouncer/1.7.2/bin:/opt/pgsql/9.5.2/bin:$PATH

export MANPATH=/opt/pgsql/9.5.2/share/man:$MANPATH

[postgres@pgtest ~]$

postgres用户执行以下命令

$ tar zxvf plproxy-2.6.tar.gz

$ make

......

......

......

gcc -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -O2 -fpic -I/opt/pgsql/9.5.2/include/server -I/opt/pgsql/9.5.2/include -DNO_SELECT=0 -I. -I./ -I/opt/pgsql/9.5.2/include/server -I/opt/pgsql/9.5.2/include/internal -D_GNU_SOURCE   -c -o src/aatree.o src/aatree.c

gcc -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -O2 -fpic -shared -o plproxy.so src/scanner.o src/parser.tab.o src/cluster.o src/execute.o src/function.o src/main.o src/query.o src/result.o src/type.o src/poll_compat.o src/aatree.o -L/opt/pgsql/9.5.2/lib -Wl,--as-needed -Wl,-rpath,'/opt/pgsql/9.5.2/lib',--enable-new-dtags  -L/opt/pgsql/9.5.2/lib -lpq 

echo "create extension plproxy;" > sql/plproxy.sql 

cat sql/plproxy_lang.sql sql/plproxy_fdw.sql > sql/plproxy--2.6.0.sql

cat sql/ext_update_validator.sql >sql/plproxy--2.3.0--2.6.0.sql

cat sql/ext_update_validator.sql >sql/plproxy--2.4.0--2.6.0.sql

cat sql/ext_update_validator.sql >sql/plproxy--2.5.0--2.6.0.sql

cat sql/ext_unpackaged.sql > sql/plproxy--unpackaged--2.6.0.sql

$

$ make install

/bin/mkdir -p '/opt/pgsql/9.5.2/lib'

/bin/mkdir -p '/opt/pgsql/9.5.2/share/extension'

/bin/mkdir -p '/opt/pgsql/9.5.2/share/extension'

/usr/bin/install -c -m 755  plproxy.so '/opt/pgsql/9.5.2/lib/plproxy.so'

/usr/bin/install -c -m 644 .//plproxy.control '/opt/pgsql/9.5.2/share/extension/'

/usr/bin/install -c -m 644  sql/plproxy--2.6.0.sql sql/plproxy--2.3.0--2.6.0.sql sql/plproxy--2.4.0--2.6.0.sql sql/plproxy--2.5.0--2.6.0.sql sql/plproxy--unpackaged--2.6.0.sql '/opt/pgsql/9.5.2/share/extension/'

$ 

3.proxy

proxy节点：

ipaddress:192.168.199.201

user: proxy

password: proxy

database：proxy

data节点

ipaddress:192.168.199.201

user: datauser

password: datauser

database：db0、db1、db2、db3

[postgres@pgtest ~]$ psql

psql (9.5.2)

Type "help" for help.

postgres=# \l

                                  List of databases

   Name    |  Owner   | Encoding |   Collate   |    Ctype    |   Access privileges   

-----------+----------+----------+-------------+-------------+-----------------------

 postgres  | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 

 template0 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +

           |          |          |             |             | postgres=CTc/postgres

 template1 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +

           |          |          |             |             | postgres=CTc/postgres

(3 rows)

创建role

postgres=# create role proxy nosuperuser login encrypted password 'proxy';

CREATE ROLE

创建proxy数据库

postgres=# create database proxy;

CREATE DATABASE

postgres=# \c proxy

You are now connected to database "proxy" as user "postgres".

加载扩展proxy

proxy=# create extension plproxy;

CREATE EXTENSION

proxy=# 

调整proxy库权限

proxy=# grant all on database proxy to proxy;

GRANT

proxy=# \c proxy proxy

You are now connected to database "proxy" as user "proxy".

proxy=> 

创建workschema schema, 目的是和数据节点的schema匹配, 这样的话可以省去在代理函数中写target强行指定schema.

数据节点也建立这个schema。

proxy=> create schema workschema;

CREATE SCHEMA

proxy=> 

创建data节点数据库

proxy=> \c postgres postgres

You are now connected to database "postgres" as user "postgres".

postgres=# create role datauser nosuperuser login encrypted password 'datauser';

CREATE ROLE 

postgres=# create database db0;

CREATE DATABASE

postgres=# create database db1;

CREATE DATABASE

postgres=# create database db2;

CREATE DATABASE

postgres=# create database db3;

CREATE DATABASE

postgres=# 

调整权限, 赋予给后面将要给user mapping中配置的option user权限.

postgres=# grant all on database db0 to datauser;

GRANT

postgres=# grant all on database db1 to datauser;

GRANT

postgres=# grant all on database db2 to datauser;

GRANT

postgres=# grant all on database db3 to datauser;

GRANT

postgres=# 

每个库创建schema

postgres=# \c db0 datauser

You are now connected to database "db0" as user "datauser".

db0=> create schema workschema;

CREATE SCHEMA

db0=> \c db1 datauser

You are now connected to database "db1" as user "datauser".

db1=> create schema workschema;

CREATE SCHEMA

db1=> \c db2 datauser

You are now connected to database "db2" as user "datauser".

db2=> create schema workschema;

CREATE SCHEMA

db2=> \c db3 datauser

You are now connected to database "db3" as user "datauser".

db3=> create schema workschema;

CREATE SCHEMA

db3=>

使用超级用户在proxy数据库中创建server.

postgres=# \c proxy postgres

proxy=#CREATE SERVER cluster_srv1 FOREIGN DATA WRAPPER plproxy options (connection_lifetime '1800',

p0 'dbname=db0 hostaddr=192.168.199.201 port=1921 application_name=test',

p1 'dbname=db1 hostaddr=192.168.199.201 port=1921',

p2 'dbname=db2 hostaddr=192.168.199.201 port=1921',

p3 'dbname=db3 hostaddr=192.168.199.201 port=1921');

CREATE SERVER

proxy=# 

创建server时可以使用libpq中的选项. 例如本例使用了application_name.

将server权限赋予给proxy用户.

proxy=# GRANT usage ON FOREIGN SERVER cluster_srv1 to proxy;

GRANT

proxy=#

配置proxy用户的连接cluster_srv1的选项.

proxy=# GRANT usage ON FOREIGN SERVER cluster_srv1 to proxy;

GRANT

proxy=# CREATE USER MAPPING FOR PROXY SERVER cluster_srv1 options(user 'datauser');

CREATE USER MAPPING

proxy=# 

用户proxy连接到cluster_srv1时使用datauser用户连接, 这里不需要配置password, 因为我们将使用trust认证.

修改数据节点的pg_hba.conf

从proxy节点使用datauser用户连接数据库db0, db1, db2,db3使用trust认证.

# 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    db0             datauser        192.168.199.0/24        trust  

host    db1             datauser        192.168.199.0/24        trust

host    db2             datauser        192.168.199.0/24        trust

host    db3             datauser        192.168.199.0/24        trust

$ pg_ctl reload -D /pgdata95/

server signaled

$ 

在plproxy节点创建代理函数

使用超级用户创建plproxy函数, 然后把函数权限赋予给proxy权限.

postgres=# \c proxy

You are now connected to database "proxy" as user "postgres".

proxy=# CREATE OR REPLACE FUNCTION workschema.dy(sql text)

proxy-# RETURNS SETOF record AS 

proxy-# $BODY$

proxy$#    cluster 'cluster_srv1';

proxy$#    run on all;

proxy$# $BODY$

proxy-# LANGUAGE 'plproxy';

CREATE FUNCTION 

proxy=# grant execute on function workschema.dy(text) to proxy;

GRANT

proxy=# 

在数据节点创建实体函数

db0\db1\db2\db3 数据库 datauser用户

CREATE OR REPLACE FUNCTION workschema.dy(sql text)

RETURNS SETOF record 

AS $BODY$

       declare rec record;

       begin

            for rec in execute sql loop

                return next rec;

            end loop;

            return;

       end;

   $BODY$

LANGUAGE 'plpgsql';

在proxy节点中就可以访问数据节点了。

# \c proxy proxy

proxy=> select * from workschema.dy('select count(*) from pg_class') as t(i int8);

  i  

-----

 311

 311

 311

 311

(4 rows)

proxy=> select sum(i) from workschema.dy('select count(*) from pg_class') as t(i int8);

 sum  

------

 1244

(1 row)

proxy=> 

plproxy节点测试

在数据节点创建测试表.

db0\db1\db2\db3 数据库 datauser用户 

创建表

create table t(id int);

创建实体函数

CREATE OR REPLACE FUNCTION workschema.f_test4()

RETURNS int

AS $$

    declare 

    begin

    insert into t(id) values(1);

    return 0;

    end;

   $$

LANGUAGE 'plpgsql';

proxy 创建代理函数

在proxy节点创建代理函数, 并且将执行权限赋予给proxy用户.

proxy=> \c proxy postgres

CREATE OR REPLACE FUNCTION workschema.f_test4() 

RETURNS int 

AS $$

cluster 'cluster_srv1';

run on 0;

$$ 

LANGUAGE 'plproxy' strict;

proxy=# grant execute on function workschema.f_test4() to proxy;

GRANT

执行代理函数

proxy=# \c proxy proxy

You are now connected to database "proxy" as user "proxy".

proxy=> 

proxy=> 

proxy=> 

proxy=> select * from workschema.f_test4();

 f_test4 

---------

       0

(1 row)

proxy=>