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mysqlが起動できない場合: No directory, logging in with HOME=/

More than 5 years have passed since last update.

参考

原因

$ grep mysql /etc/passwd
mysql:x:106:111:MySQL Server,,,:/nonexistent:/bin/false

HOMEが /nonexistent になっている。

修正

usermod -d /var/lib/mysql mysql
mysql_install_db

これで起動できるようになる。
(なお /nonexistent を作ってmysql権限にしても起動できなかった。)

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