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サーバーが起動しない時の対処法

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A server is already running.が出てrails s が起動しない時

#lsof -i

COMMAND  PID    USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
ruby2.5 2722 vagrant   15u  IPv4  23988      0t0  TCP ubuntu-bionic:3000->_gateway:52166 (CLOSE_WAIT)
ruby2.5 2722 vagrant   16u  IPv4  23985      0t0  TCP *:3000 (LISTEN)

この2722が邪魔。なので

#kill -9 2722

killed

これで動かせる。
アプリ/tmp/pids/server.pidのファイルを削除してもいけるらしい。

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