Postgresql 12复制失败

我正在尝试复制仍在运行/活动的数据库服务器，以接受来自用户的请求，例如插入和更新

我运行了下面提到的命令，开始将我的主服务器复制到复制服务器：

 root@replica:~#sudo -u postgres pg_basebackup -h [PRIMARY_IP] -D /var/lib/postgresql/12/main -U replication -P -v

备份过程没有错误，已经完成，但在尝试启动postgresql server时遇到如下错误

root@replica：~#tail/var/log/postgresql/postgresql-12-main.log

2020-10-03 01:15:12.198 UTC [552567] FATAL:  database system identifier differs between the primary and standby
2020-10-03 01:15:12.198 UTC [552567] DETAIL:  The primary's identifier is 6805716485467355646, the standby's identifier is 6875279138564418280.
2020-10-03 01:15:17.204 UTC [552568] FATAL:  database system identifier differs between the primary and standby
2020-10-03 01:15:17.204 UTC [552568] DETAIL:  The primary's identifier is 6805716485467355646, the standby's identifier is 6875279138564418280.
2020-10-03 01:15:22.207 UTC [552570] FATAL:  database system identifier differs between the primary and standby
2020-10-03 01:15:22.207 UTC [552570] DETAIL:  The primary's identifier is 6805716485467355646, the standby's identifier is 6875279138564418280.
2020-10-03 01:15:27.212 UTC [552579] FATAL:  database system identifier differs between the primary and standby
2020-10-03 01:15:27.212 UTC [552579] DETAIL:  The primary's identifier is 6805716485467355646, the standby's identifier is 6875279138564418280.
2020-10-03 01:15:32.216 UTC [552581] FATAL:  database system identifier differs between the primary and standby
2020-10-03 01:15:32.216 UTC [552581] DETAIL:  The primary's identifier is 6805716485467355646, the standby's identifier is 6875279138564418280.

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有人知道如何在不再次尝试

pg_basebackup

过程的情况下解决这个问题吗？因为我需要时间和带宽。

是的，我以前从未做过。我按照@jjane的建议，删除了以前的副本，然后运行：

sudo -u postgres pg_basebackup -h [PRIMARY_IP] -D /var/lib/postgresql/12/main -U replication -P -v -R -X stream -C -S pgbackup1

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是的，我以前从未做过。我按照@jjane的建议，删除了以前的副本，然后运行：

sudo -u postgres pg_basebackup -h [PRIMARY_IP] -D /var/lib/postgresql/12/main -U replication -P -v -R -X stream -C -S pgbackup1

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而且它还能工作。

我知道你没有在pg_basebackup中使用-R。那么你是如何设置流媒体的呢？最简单的解释是，您做得不对，将复制指向不同于备份的服务器。我发现您没有在pg_basebackup中使用-R。那么你是如何设置流媒体的呢？最简单的解释是，您做错了，将复制指向与备份不同的服务器。