记录mysql错误：Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

此问题百度一大把，大多都是因为套接字mysql.scok找不到造成的，解决办法也很多。我虽然也是这个问题，但造成的原因不是这样的。

后来通过查看mysql生成的错误日志

161115 22:18:02 mysqld_safe Starting mysqld daemon with databases from /home/mysql_data

161115 22:18:02 [Warning] '--skip-locking' is deprecated and will be removed in a future release. Please use '--skip-external-locking' instead.

161115 22:18:02 [Warning] '--skip-locking' is deprecated and will be removed in a future release. Please use '--skip-external-locking' instead.

161115 22:18:02 [Note] Plugin 'FEDERATED' is disabled.

161115 22:18:03  InnoDB: Initializing buffer pool, size = 8.0M

161115 22:18:03  InnoDB: Completed initialization of buffer pool

161115 22:18:03  InnoDB: Started; log sequence number 0 44263

/usr/local/mysql/libexec/mysqld: File './mysql-bin.000020' not found (Errcode: 2)

161115 22:18:03 [ERROR] Failed to open log (file './mysql-bin.000020', errno 2)

161115 22:18:03 [ERROR] Could not open log file

161115 22:18:03 [ERROR] Can't init tc log

161115 22:18:03 [ERROR] Aborting

此错误是启动不了mysql造成的

./mysql-bin.000020 这个文件找不到。于是修改 mysql-bin.index ，删掉所有，让mysql重新生成，问题解决！