Mac - Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

在终端输入mysql,结果出现

macdeMacBook-Pro:~ mac$ alias mysql=/usr/local/mysql/bin/mysql
macdeMacBook-Pro:~ mac$ mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

在网上搜到很多方法，不好使，然后查询了官方文档

http://dev.mysql.com/doc/refman/5.7/en/can-not-connect-to-server.html

下面写道

Here are some reasons the Can't connect to local MySQL server error might occur:

mysqld is not running on the local host. Check your operating system's process list to ensure the mysqld process is present.
。。。

没想到第一条就符合，然后我尝试输入mysqld

结果:

macdeMacBook-Pro:bin mac$ mysqld
2018-05-10T07:23:29.997151Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-05-10T07:23:29.997492Z 0 [Note] --secure-file-priv is set to NULL. Operations related to importing and exporting data are disabled
2018-05-10T07:23:29.997557Z 0 [Note] mysqld (mysqld 5.7.22) starting as process 33939 ...
2018-05-10T07:23:30.003105Z 0 [Warning] Setting lower_case_table_names=2 because file system for /usr/local/var/mysql/ is case insensitive
2018-05-10T07:23:30.004893Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-05-10T07:23:30.004919Z 0 [Note] InnoDB: Uses event mutexes
2018-05-10T07:23:30.004926Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-05-10T07:23:30.004932Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.3
2018-05-10T07:23:30.005337Z 0 [Note] InnoDB: Number of pools: 1
2018-05-10T07:23:30.005498Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-05-10T07:23:30.007117Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-05-10T07:23:30.018796Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-05-10T07:23:30.035212Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-05-10T07:23:30.051578Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-05-10T07:23:30.051764Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-05-10T07:23:30.065007Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-05-10T07:23:30.065856Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-05-10T07:23:30.065868Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-05-10T07:23:30.066135Z 0 [Note] InnoDB: Waiting for purge to start
2018-05-10T07:23:30.121419Z 0 [Note] InnoDB: 5.7.22 started; log sequence number 2551674
2018-05-10T07:23:30.121762Z 0 [Note] InnoDB: Loading buffer pool(s) from /usr/local/var/mysql/ib_buffer_pool
2018-05-10T07:23:30.122048Z 0 [Note] Plugin 'FEDERATED' is disabled.
2018-05-10T07:23:30.133391Z 0 [Note] InnoDB: Buffer pool(s) load completed at 180510 15:23:30
2018-05-10T07:23:30.134352Z 0 [Note] Found ca.pem, server-cert.pem and server-key.pem in data directory. Trying to enable SSL support using them.
2018-05-10T07:23:30.134366Z 0 [Note] Skipping generation of SSL certificates as certificate files are present in data directory.
2018-05-10T07:23:30.135842Z 0 [Warning] CA certificate ca.pem is self signed.
2018-05-10T07:23:30.135903Z 0 [Note] Skipping generation of RSA key pair as key files are present in data directory.
2018-05-10T07:23:30.142139Z 0 [Note] Server hostname (bind-address): '127.0.0.1'; port: 3306
2018-05-10T07:23:30.142191Z 0 [Note]   - '127.0.0.1' resolves to '127.0.0.1';
2018-05-10T07:23:30.142330Z 0 [Note] Server socket created on IP: '127.0.0.1'.
2018-05-10T07:23:30.195770Z 0 [Note] Event Scheduler: Loaded 0 events
2018-05-10T07:23:30.195949Z 0 [Note] mysqld: ready for connections.
Version: '5.7.22'  socket: '/tmp/mysql.sock'  port: 3306  Homebrew

等一大串错误之类的，最后退出了

最后，正确的方法：

macdeMacBook-Pro:~ mac$ sudo mysqld_safe
Password:
Logging to '/usr/local/var/mysql/macdeMacBook-Pro.local.err'.
2018-05-10T07:14:22.6NZ mysqld_safe Starting mysqld daemon with databases from /usr/local/var/mysql
2018-05-10T07:14:22.6NZ mysqld_safe mysqld from pid file /usr/local/var/mysql/macdeMacBook-Pro.local.pid ended
macdeMacBook-Pro:~ mac$ mysql
ERROR 1045 (28000): Access denied for user 'mac'@'localhost' (using password: NO)

然后mysqld服务就运行啦

此时，终于能够打开mysql

Mac - Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

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