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我正在尝试在本地升级 postgres，这样我就不会收到版本不匹配错误。这就是我所做的：

echo "http://dl-5.alpinelinux.org/alpine/v3.5/main" >> /etc/apk/repositories;
apk update

bash-4.3# apk add postgresql-dev
(1/4) Installing libressl2.4-libtls (2.4.4-r0)
(2/4) Installing libressl-dev (2.4.4-r0)
(3/4) Installing postgresql-libs (9.6.5-r0)
(4/4) Installing postgresql-dev (9.6.5-r0)
Executing busybox-1.24.2-r13.trigger
OK: 353 MiB in 108 packages
bash-4.3# pg_dump
bash: /usr/bin/pg_dump: No such file or directory

我不知所措-知道问题出在哪里吗？

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1 回答 1

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只是一个猜测，但我猜你还没有安装 postgresql。为了使用 pg_dump 你必须安装它，或者如果你已经安装了它并且我错了，尝试像这样重新安装它：

bash-4.3# apk del postgresql
(1/4) Purging postgresql (9.6.5-r0)
(2/4) Purging postgresql-client (9.6.5-r0)
(3/4) Purging libedit (20170329.3.1-r2)
(4/4) Purging libxml2 (2.9.4-r4)
Executing busybox-1.26.2-r5.trigger
OK: 37 MiB in 25 packages
bash-4.3# apk add postgresql
(1/4) Installing libedit (20170329.3.1-r2)
(2/4) Installing postgresql-client (9.6.5-r0)
(3/4) Installing libxml2 (2.9.4-r4)
(4/4) Installing postgresql (9.6.5-r0)
Executing busybox-1.26.2-r5.trigger
OK: 53 MiB in 29 packages
bash-4.3# pg_dump
pg_dump: [archiver (db)] connection to database "root" failed: could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/tmp/.s.PGSQL.5432"?
bash-4.3#

正如您从上面看到的那样，pg_dump 正在工作，因为它在 postgresql 包中，即使在 alpine 包站点上列出它应该在 postgresql-client 包中，如此处所示，但除非安装了 postgres，否则它不起作用。如果你不能安装完整的 postgres，我推荐这个有点不干净的解决方法，安装 postgres，备份 pg_dump 二进制文件，卸载 postgres 然后像这样恢复 pg_dump：

bash-4.3# apk add postgresql
(1/2) Installing libxml2 (2.9.4-r4)
(2/2) Installing postgresql (9.6.5-r0)
Executing busybox-1.26.2-r5.trigger
OK: 53 MiB in 29 packages
bash-4.3# cp /usr/bin/pg_dump /usr/bin/pg_dump
pg_dump     pg_dumpall  
bash-4.3# cp /usr/bin/pg_dump /usr/bin/pg_dump.back
bash-4.3# cp /usr/bin/pg_dumpall /usr/bin/pg_dumpall.back
bash-4.3# apk del postgresql
(1/2) Purging postgresql (9.6.5-r0)
(2/2) Purging libxml2 (2.9.4-r4)
Executing busybox-1.26.2-r5.trigger
OK: 38 MiB in 27 packages
bash-4.3# mv /usr/bin/pg_dump.back /usr/bin/pg_dump
bash-4.3# mv /usr/bin/pg_dumpall.back /usr/bin/pg_dumpall
bash-4.3# pg_dump
pg_dump: [archiver (db)] connection to database "root" failed: could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/tmp/.s.PGSQL.5432"?
bash-4.3#

这并不理想，但过去对我有用

于 2017-10-07T14:46:39.670 回答