查看 mongodb 状态 sudo systemctl status mongod如下：
sudo mongod --repair --dbpath /var/lib/mongodb
chown -R mongodb:mongodb /var/lib/mongodb
chown mongodb:mongodb /tmp/mongodb-27017.sock
sudo systemctl restart mongod
ok
取自http://5.9.10.113/67051214/cant-start-mongodb-database-server-on-ubuntu20-04
