救命...postgresql无法添加用户（已经解决）

loin

15:08|loin@~>$sudo -u postgres sh
15:08|postgres@~>$createuser -ADP loin
Enter password for new role:
Enter it again:
Shall the new role be allowed to create more new roles? (y/n) y
createuser: could not connect to database postgres: 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"?
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解决办法：该死，我查看了一下，没有启动服务端..............