sql - 我可以在逻辑复制中使用 .pgpass 吗？

Question

我正在使用逻辑复制。我做了如下订阅。

=# CREATE SUBSCRIPTION mysub CONNECTION 'host=xxx.xxx.xxx.xxx port=5432 
     user=postgres dbname=mydb password=<password>' PUBLICATION mypub;
NOTICE:  created replication slot "mysub" on publisher
CREATE SUBSCRIPTION

但我想知道我是否可以使用 .pgpass 文件来提供密码。当然，我试过了。但它失败了，如下所示。

=# CREATE SUBSCRIPTION mysub CONNECTION 'host=xxx.xxx.xxx.xxx port=5432 
    user=postgres dbname=mydb' PUBLICATION mypub;
ERROR:  could not connect to the publisher: fe_sendauth: no password supplied

[我的.pgpass]

localhost:5432:postgres:postgres:<password>
localhost:5432:mydb:postgres:<password>
xxx.xxx.xxx.xxx:5432:mydb:postgres:<password>

这个 .pgpass 文件适用于 pgAgent。

我可以使用 .pgpass 文件进行逻辑复制吗？或者我应该在 CREATE 语句中写下我的密码吗？如果在 CREATE 命令中写入密码是唯一的答案，那么它安全吗？

Answer 1

https://www.postgresql.org/docs/10/static/sql-createsubscription.html

CONNECTION 'conninfo' The connection string to the publisher. For details see

https://www.postgresql.org/docs/10/static/libpq-connect.html#LIBPQ-CONNSTRING

passfile

Specifies the name of the file used to store passwords (see Section 33.15). Defaults to ~/.pgpass

所以是的 - 它应该有效。让我们模拟一下。首先我特意用了bad passfile看看有没有反射(reflect)error:

t=# CREATE SUBSCRIPTION mysub CONNECTION 'host=localhost port=5433 passfile=/tmp/p user=vao dbname=t' PUBLICATION mypub;
ERROR:  could not connect to the publisher: fe_sendauth: no password supplied

不，不是，但检查日志确实:

-bash-4.2$ tail /pg/d10/log/postgresql-Tue.log | grep WARN | tail -n 1
WARNING: password file "/tmp/p" has group or world access; permissions should be u=rw (0600) or less

好的，尝试使用默认值:

t=# CREATE SUBSCRIPTION mysub CONNECTION 'host=localhost port=5433 user=vao dbname=t' PUBLICATION mypub;
ERROR:  could not connect to the publisher: fe_sendauth: no password supplied

而且这次连警告都没有!所以检查 chmod:

-bash-4.2$ ll ~/.pgpass
-r-------- 1 postgres postgres 1227 May 15 15:00 /home/vao/.pgpass

看起来不错，但是啊哈 - 此连接没有线路，因为下面要求输入密码:

-bash-4.2$ psql -h localhost -p 5433 -U vao t
Password for user vao:

所以:

echo '*:*:*:vao:blah' > ~/.pgpass
-bash-4.2$ psql -h localhost -p 5433 -U vao t
psql: FATAL:  password authentication failed for user "vao"
password retrieved from file "/var/lib/pgsql93/.pgpass"

啊哈 - 现在它使用了它，所以回到 SQL:

t=# CREATE SUBSCRIPTION mysub CONNECTION 'host=localhost port=5433 user=vao dbname=t' PUBLICATION mypub;
ERROR:  could not connect to the publisher: FATAL:  password authentication failed for user "vao"
password retrieved from file "/var/lib/pgsql93/.pgpass"

是的，您可以使用指定的和默认的 pgpassword 文件进行逻辑复制订阅