下記エラーがでてうまく動かない時の対処方法
PG::ConnectionBad: 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"?
結論
versionが10で古かったので、12にあげたら動きました。
xxxx [master=]$ postgres -D /usr/local/var/postgres 2020-07-05 20:51:03.344 JST [4538] FATAL: database files are incompatible with server 2020-07-05 20:51:03.344 JST [4538] DETAIL: The data directory was initialized by PostgreSQL version 10, which is not compatible with this version 12.3.
brew postgresql-upgrade-database
直らない
rm /usr/local/var/postgres/postmaster.pid