在postgressql內部修改pg_hba.conf

查看pg_hba.conf文件的內容：

postgres=# select * from pg_hba_file_rules;
 line_number | type  |   database    | user_name |  address  |                 netmask                 | auth_method | options | error 
-------------+-------+---------------+-----------+-----------+-----------------------------------------+-------------+---------+-------
          84 | local | {all}         | {all}     |           |                                         | trust       |         | 
          86 | host  | {all}         | {all}     | 127.0.0.1 | 255.255.255.255                         | trust       |         | 
          88 | host  | {all}         | {all}     | ::1       | ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff | trust       |         | 
          91 | host  | {all}         | {all}     | 27.0.0.0  | 255.0.0.0                               | md5         |         | 
          92 | local | {replication} | {all}     |           |                                         | trust       |         | 
          93 | host  | {replication} | {all}     | 127.0.0.1 | 255.255.255.255                         | trust       |         | 
          94 | host  | {replication} | {all}     | ::1       | ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff | trust       |         | 
          95 | host  | {all}         | {all}     | 27.0.0.0  | 255.0.0.0                               | md5         |         | 
(8 rows)

postgres=# 

雖然可以在postgresql內部可以查看，但是並不能直接在postgresql修改該文件。當然，如果你有操作系統權限，可以在os中直接修改。

 

我們來看看，pg_hba.conf文件在操作系統上位置：

postgres=# select setting from pg_settings where name like '%hba%';
             setting              
----------------------------------
 /pgdata/11/data/pg_hba.conf
(1 row)

postgres=# 

知道這些信息后，我們就可以將這些內容加載到表中：

postgres=# create table hba(lines text);
CREATE TABLE
postgres=# copy hba from '/pgdata/11/data/pg_hba.conf';
COPY 94
postgres=# 

一旦加載到表中，我們就有了pg_hba.conf文件中的內容。

postgres=# select * from hba where lines !~ '^#' and lines !~ '^$';
                                 lines                                 
-----------------------------------------------------------------------
 local   all             all                                     trust
 host    all             all             127.0.0.1/32            trust
 host    all             all             ::1/128                 trust
 host    all             all             27.0.0.0/8              md5
 local   replication     all                                     trust
 host    replication     all             127.0.0.1/32            trust
 host    replication     all             ::1/128                 trust
(7 rows)

postgres=# 

現在我們就可以按照常規表的方式插入記錄了：

postgres=# insert into hba (lines) values ('host  all mydb  ::1/128                 trust');
INSERT 0 1
postgres=# select * from hba where lines !~ '^#' and lines !~ '^$';
                                 lines                                 
-----------------------------------------------------------------------
 local   all             all                                     trust
 host    all             all             127.0.0.1/32            trust
 host    all             all             ::1/128                 trust
 host    all             all             27.0.0.0/8              md5
 local   replication     all                                     trust
 host    replication     all             127.0.0.1/32            trust
 host    replication     all             ::1/128                 trust
 host  all mydb  ::1/128                 trust
(8 rows)

postgres=# 

再把表的內容寫回到文件中：

postgres=# copy hba to '/pgdata/11/data/pg_hba.conf';
COPY 95
postgres=# 

讀取文件，看看我們新加的規則是否已經在文件中了：

postgres=# select pg_read_file('pg_hba.conf');
....

修改了配置后，需要reload一下方可生效：

postgres=# select pg_reload_conf();
 pg_reload_conf 
----------------
 t
(1 row)

postgres=# 

 

不過，這種方式建議謹慎使用！