Question

我无法弄清楚为什么我无法使用 Node.js

登录Postgres

user: postgres
password: postgres
host: 192.168.99.100
port: 5432
database: test_db

以下是Node.js中导致错误的几行代码

error: password authentication failed for user "postgres"

var pg = require('pg');
var conString = 
"postgres://postgres:postgres@192.168.99.100:5432/test_db";

var client = new pg.Client(conString);
client.connect();

我从Docker容器运行Postgres。

我启动了另一个容器，可以使用以下命令

成功访问数据库

psql -U postgres -d test_db -h 192.168.99.100 -W

此外，我可以使用pgAdmin 4

成功登录

的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
 # 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 all all all md5

postgresql.conf中

 #------------------------------------------------------------------------------
 # CONNECTIONS AND AUTHENTICATION
 #------------------------------------------------------------------------------

 # - Connection Settings -

 listen_addresses = '*'                  # comma-separated list of addresses;
                                         # defaults to 'localhost'; use '*' for all
                                         # (change requires restart)
 #port = 5432                            # (change requires restart)
 max_connections = 100                   # (change requires restart)
 #superuser_reserved_connections = 3     # (change requires restart)
 #unix_socket_directories = '/var/run/postgresql'        # comma-separated list of directories
                                         # (change requires restart)
 #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_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
 #row_security = on

 # 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

感谢任何帮助...

Answer 1

以上都没有通过Node.js应用程序连接到数据库

经过数小时的试验和错误后，我决定在我的MAC上安装一个Postgres实例。在安装时，Postgres使用了操作系统的登录凭据（在这种情况下是我的MAC登录凭据）。我能够使用我的Node.js应用程序登录Postgres DB。

然后我想也许这就是造成连接问题的所有因素 - 操作系统用户名。标准的Postgres Docker镜像具有 root 作为标准用户名。切换到 root 后，我能够毫无问题地登录。

这里重现的步骤：

获取标准的Postgres Docker镜像
```
docker pull postgres
```

使用以下环境变量启动Docker容器：

docker run --name pg -p 5432:5432 -e POSTGRES_PASSWORD=passwrd -e POSTGRES_USER=root -e POSTGRES_DB=dse -d postgres

启动命令行界面并测试连接。这使用了docker主机的IP。要使用IP docker-machine ip。密码为passwrd

docker exec -ti pg /bin/bash

psql -U root -d dse -h 192.168.99.100 -W
Password for user root: 
psql (9.6.2)
Type "help" for help.

dse=#

注意：这也可以防止出现以下错误：psql: FATAL: role "root" does not exist

使用以下内容创建一个Node.js应用程序和一个名为connect.js的文件：

var pg = require('pg');

var conString = "postgres://root:passwrd@192.168.99.100/dse";
var client = new pg.Client(conString);
client.connect();
console.log(client.connectionParameters);
process.exit(1);

运行应用
```
node connect.js 
```

PS：我没有编辑这些文件pg_hba.conf，postgresql.conf。

我希望这会帮助其他人解决同样的问题。

Answer 2

问题出在pg_hba.conf档案中：

host all all all md5

在第三列（地址）中，您应指定域名或网络掩码。您无法使用all关键字，因为它被视为域名，因此无效。

允许所有连接：

host all all 0.0.0.0/0 md5

或允许某些特定网络：

host all all 192.168.0.0/16 md5

请勿忘记重新加载配置，以便更改生效（service postgresql reload或/etc/init.d/postgresql reload）

Postgres，Docker＆amp; Node.js - 密码身份验证失败（连接被拒绝或psql：致命：角色“root”不存在）

2 个答案: