新安装的数据库连接时提示如下错误:
[postgres@postgres data]$ psql -h 192.168.40.160 -p5432 -d postgres
psql: error: FATAL: no pg_hba.conf entry for host "192.168.40.160", user "postgres", database "postgres", SSL off
[postgres@postgres data]$
出现该错误的原因是没有在pg_hba.conf 里面配置IP地址,pg_hba.conf默认的配置格式如下
# 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
# IPv6 local connections:
host all all ::1/128 trust
# Allow replication connections from localhost, by a user with the
# replication privilege.
local replication all trust
host replication all 127.0.0.1/32 trust
host replication all ::1/128 trust
# IPv4 local connections:
# TYPE DATABASE USER ADDRESS METHOD
host all all 127.0.0.1/32 trust
可以看到,默认可以连接的ADDRESS为127.0.0.1/32, 所以通过localhost是可以连接的
[postgres@postgres data]$ psql -hlocalhost -p5432
psql (12.10)
Type "help" for help.
postgres=#
如果想指定某些IP或者某段范围IP可以连接,比如通过IP 192.168.40.160连接,并且DATABASE列为postgres数据库, 允许通过IP 192.168.40.160连接postgres数据库,添加如下内容
# 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 postgres all 192.168.40.160/32 trust
# IPv6 local connections:
host all all ::1/128 trust
# Allow replication connections from localhost, by a user with the
# replication privilege.
local replication all trust
host replication all 127.0.0.1/32 trust
host replication all ::1/128 trust
更改pg_hba.conf之后,需要重新启动数据库
[postgres@postgres data]$ pg_ctl restart
waiting for server to shut down.... done
server stopped
waiting for server to start....2022-03-16 14:50:39.720 CST [15259] LOG: starting PostgreSQL 12.10 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-4), 64-bit
2022-03-16 14:50:39.721 CST [15259] LOG: listening on IPv4 address "0.0.0.0", port 5432
2022-03-16 14:50:39.721 CST [15259] LOG: listening on IPv6 address "::", port 5432
2022-03-16 14:50:39.723 CST [15259] LOG: listening on Unix socket "/tmp/.s.PGSQL.5432"
2022-03-16 14:50:39.729 CST [15259] LOG: redirecting log output to logging collector process
2022-03-16 14:50:39.729 CST [15259] HINT: Future log output will appear in directory "log".
done
server started
[postgres@postgres data]$
连接postgres数据库测试
[postgres@postgres data]$ psql -h 192.168.40.160 -p5432 -d postgres -U postgres
psql (12.10)
Type "help" for help.
postgres=# \q
连接其他数据库则会报错,测试如下:
[postgres@postgres data]$ psql -h 192.168.40.160 -p5432 -d postgres -U postgres
psql (12.10)
Type "help" for help.
postgres=# \h create database
Command: CREATE DATABASE
Description: create a new database
Syntax:
CREATE DATABASE name
[ [ WITH ] [ OWNER [=] user_name ]
[ TEMPLATE [=] template ]
[ ENCODING [=] encoding ]
[ LC_COLLATE [=] lc_collate ]
[ LC_CTYPE [=] lc_ctype ]
[ TABLESPACE [=] tablespace_name ]
[ ALLOW_CONNECTIONS [=] allowconn ]
[ CONNECTION LIMIT [=] connlimit ]
[ IS_TEMPLATE [=] istemplate ] ]
URL: https://www.postgresql.org/docs/12/sql-createdatabase.html
postgres=# create database oracle;
CREATE DATABASE
postgres=# \q
[postgres@postgres data]$ pg_ctl restart
waiting for server to shut down.... done
server stopped
waiting for server to start....2022-03-16 15:05:16.653 CST [16534] LOG: starting PostgreSQL 12.10 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-4), 64-bit
2022-03-16 15:05:16.654 CST [16534] LOG: listening on IPv4 address "0.0.0.0", port 5432
2022-03-16 15:05:16.654 CST [16534] LOG: listening on IPv6 address "::", port 5432
2022-03-16 15:05:16.656 CST [16534] LOG: listening on Unix socket "/tmp/.s.PGSQL.5432"
2022-03-16 15:05:16.664 CST [16534] LOG: redirecting log output to logging collector process
2022-03-16 15:05:16.664 CST [16534] HINT: Future log output will appear in directory "log".
done
server started
[postgres@postgres data]$
[postgres@postgres data]$ psql -h 192.168.40.160 -p5432 -d oracle -U postgres
psql: error: FATAL: no pg_hba.conf entry for host "192.168.40.160", user "postgres", database "oracle", SSL off
[postgres@postgres data]$