[ERROR] Can't start server: can't create PID file: No such file or directory

에러 종류
081223 10:13:55 [ERROR] /usr/local/mysql/bin/mysqld: Can't create/write to file '/var/run/mysqld/mysqld.pid' (Errcode: 2)
081223 10:13:55 [ERROR] Can't start server: can't create PID file: No such file or directory
081223 10:13:55  mysqld ended 

확인 결과
/var/run/mysqld/mysqld.pid 를 생성하지 못해서 에러가 생김

처리 방법
/var/run 아래에 mysqld 디렉토리 생성 후 소유권을 줌으로써 해결

[root@localhost run]# cd /var/run
[root@localhost run]# mkdir mysqld
[root@localhost run]# chown mysql mysqld
[root@localhost run]# chgrp mysql mysqld 



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