macos - PG::ConnectionBad 升级到 Yosemite 和 postgresql 9.4.4

Question

我刚刚将我的 mac OS X 更新为 Yosemite，版本 10.10.4，并将 postgresql 更新为:psql (PostgreSQL) 9.4.4。

在我的 Rails 4.2.1 应用程序上运行 rake db:migrate 后，我的终端 session 响应:

rake aborted!
PG::ConnectionBad: could not connect to server: Connection refused
    Is the server running on host "localhost" (127.0.0.1) and accepting
    TCP/IP connections on port 5432?
could not connect to server: Connection refused
    Is the server running on host "localhost" (::1) and accepting
    TCP/IP connections on port 5432?

在我的终端 session 中简单地输入 psql 也显得有点不正常:

$ psql
psql: 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"?

从 cat/usr/local/var/postgres/server.log 打印出日志后，我读到:

DETAIL:  The data directory was initialized by PostgreSQL version 9.3, which is not compatible with this version 9.4.4.
LOG:  skipping missing configuration file "/usr/local/var/postgres/postgresql.auto.conf"
FATAL:  database files are incompatible with server

我找到了 this answer在 SO 上，但我犹豫要不要开始创建一堆目录，除非那真的是我想做的。我还找到了一个 older answer但我不太确定它是否是要遵循的那个。

这SO answer建议我删除一个，/usr/local/var/postgres/postmaster.pid，但我没有，我有一个，/usr/local/var/postgres/postmaster.opts——我应该删除 postmaster。选择？

似乎有很多建议，但我不太确定要遵循什么。有人可以提供一些建议让我的 postgresql 数据库在我的 Rails 应用程序上运行吗？

Answer 1

您可以按照官方指南升级数据库:

brew switch postgres 9.3    # presuming you already installed 9.4.4
pg_dumpall > outputfile
launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
mv /usr/local/var/postgres /usr/local/var/postgres.old
brew switch postgres 9.4.4
initdb -D /usr/local/var/postgres
psql -d postgres -f outputfile

PostgreSQL upgrade