[Ubuntu 16.04] 我安装了 postgresql 9.5 以及依赖项：
sudo sh -c "echo 'deb http://apt.postgresql.org/pub/repos/apt/ xenial-pgdg main' > /etc/apt/sources.list.d/pgdg.list"
wget --quiet -O - http://apt.postgresql.org/pub/repos/apt/ACCC4CF8.asc | sudo apt-key add -
sudo apt-get update
sudo apt-get install postgresql-common
sudo apt-get install postgresql-9.5 libpq-dev
当我想跑步时，psql我得到：
psql: could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?
但是/var/run/postgresql/是空的。当我重新启动 posgresql 时，一切似乎都很好：
$ /etc/init.d/postgresql restart
[ ok ] Restarting postgresql (via systemctl): …postgresql ×1