OperationalError：错误：pgbouncer 无法连接到服务器

Question

我正在尝试在 Django 安装上执行 python manage.py syncdb，但我不断收到 OperationalError: ERROR: pgbouncer cannot connect to server。 pgbouncer.log 包含如下行：

2017-09-19 19:44:15.107 1128 LOG C-0x8a9930: mydb/myuser@unix:6432 closing because: pgbouncer cannot connect to server (age=0)
2017-09-19 19:44:15.107 1128 WARNING C-0x8a9930: mydb/myuser@unix:6432 Pooler Error: pgbouncer cannot connect to server
2017-09-19 19:44:15.107 1128 LOG S-0x8c72e0: mydb/myuser@35.154.149.188:5432 new connection to server
2017-09-19 19:44:15.107 1128 LOG C-0x8a9930: mydb/myuser@unix:6432 login failed: db=mydb user=myuser
2017-09-19 19:44:30.108 1128 LOG S-0x8c72e0: mydb/myuser@35.154.149.188:5432 closing because: connect failed (age=15)

如果需要，ps -aef | grep pgbouncer 产生：

postgres  1128     1  0 18:38 ?        00:00:00 /usr/sbin/pgbouncer -d /etc/pgbouncer/pgbouncer.ini
myuser    1919  1533  0 19:45 pts/0    00:00:00 grep --color=auto pgbouncer

此外，grep port /etc/pgbouncer/pgbouncer.ini 会导致：

;;   dbname= host= port= user= password=
mydb = host=xx.xxx.xxx.xxx port=5432 dbname=mydb
;forcedb = host=127.0.0.1 port=300 user=baz password=foo client_encoding=UNICODE datestyle=ISO connect_query='SELECT 1'
listen_port = 6432

最后，settings.py 的相关部分包含：

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'mydb',
        'USER': 'myuser',
        'PASSWORD': 'mypassword',
        'HOST': '/var/run/postgresql',
        'PORT': '6432',
    }

---

我在 postgresql.conf 中将 log_connections 转为 on，重新启动 PG 并再次尝试。以下是相关行：

2017-09-20 07:50:59 UTC LOG:  database system is ready to accept connections
2017-09-20 07:50:59 UTC LOG:  autovacuum launcher started
2017-09-20 07:51:00 UTC LOG:  connection received: host=[local]
2017-09-20 07:51:00 UTC LOG:  incomplete startup packet
2017-09-20 07:51:00 UTC LOG:  connection received: host=[local]
2017-09-20 07:51:00 UTC LOG:  connection authorized: user=postgres database=postgres
2017-09-20 07:51:01 UTC LOG:  connection received: host=[local]
2017-09-20 07:51:01 UTC LOG:  connection authorized: user=postgres database=postgres
2017-09-20 07:51:01 UTC LOG:  connection received: host=[local]
2017-09-20 07:51:01 UTC LOG:  connection authorized: user=postgres database=postgres

似乎连接正在通过，但user 和database 的名称是postgres。这些凭据不是我在pgbouncer.ini 中提供的。

但是，在pgbouncer.ini 中描述的连接字符串中显式添加myuser 会导致：

2017-09-20 09:37:37 UTC FATAL:  Peer authentication failed for user "myuser"
2017-09-20 09:37:37 UTC DETAIL:  Connection matched pg_hba.conf line 90: "local   all             all                                     peer"

完全被难住了。

Answer 1

看来settings.py中的这一行出现了错误配置：

'PORT': '6432',

我评论了它并且 pgbouncer 开始工作。

虽然我不确定“为什么”。

也许这个端口发生了冲突；在我的例子中，Pgbouncer 和 PG 在一个服务器上共存。我过去在不同的虚拟机上设置它们没有任何障碍（并且无需评论'PORT': '6432',）