【发布时间】：2020-05-05 07:43:54
【问题描述】：
根据 Homebrew 和我的 wordpress 应用程序，我的 MySQL 似乎无法在我的 MacOS Catalina (10.15) 上正确运行，它无法连接到我的 MySQL 服务器。当我尝试读取SQL Pro 中的数据库时，SQL Pro 也无法建立连接。但是，我可以使用令我困惑的终端 shell 登录 MySQL。
我的 MySQL 进程有什么问题？ MySQL 昨天在我的 wordpress 应用程序上运行良好。唯一的区别是我重新启动了计算机，现在我似乎无法使用自制软件成功启动它，并且 wordpress 无法建立与它的连接。这是关于 wordpress 和 homebrew 的详细信息和日志的分解
WordPress
昨天，我重新启动了在 MacOS 上运行的笔记本电脑，重新启动计算机后，我尝试在本地运行我的 wordpress 应用程序，但 wordpress 抱怨建立数据库连接时出错：
Warning: mysqli_real_connect(): Unexpected server response while doing caching_sha2 auth: 109 in /Users/robskrob/code/projects/myblog/wordpress/web/wp/wp-includes/wp-db.php on line 1633
Warning: mysqli_real_connect(): (HY000/2006): MySQL server has gone away in /Users/robskrob/code/projects/kingandpartners/myblog/wordpress/web/wp/wp-includes/wp-db.php on line 1633
MySQL server has gone away
Error establishing a database connection
This either means that the username and password information in your wp-config.php file is incorrect or we can’t contact the database server at 127.0.0.1. This could mean your host’s database server is down.
Are you sure you have the correct username and password?
Are you sure you have typed the correct hostname?
Are you sure the database server is running?
If you’re unsure what these terms mean you should probably contact your host. If you still need help you can always visit the WordPress Support Forums.
MySQL Homebrew 日志
我在/usr/local/var/mysql/Roberts-MBP-4.fios-router.home.err 中检查了我认为是mysql homebrew 安装的日志文件——这些是今天的日志：
2020-01-17T23:59:48.010069Z 0 [Note] InnoDB: page_cleaner: 1000ms intended loop took 2098009ms. The settings might not be optimal. (flushed=0 and evicted=0, during the time.)
2020-01-18T00:32:58.010992Z 0 [Note] InnoDB: page_cleaner: 1000ms intended loop took 1937613ms. The settings might not be optimal. (flushed=0 and evicted=0, during the time.)
2020-01-18T02:26:25.009708Z 0 [Note] InnoDB: page_cleaner: 1000ms intended loop took 6753733ms. The settings might not be optimal. (flushed=0 and evicted=0, during the time.)
2020-01-18T03:15:04.012850Z 0 [Note] InnoDB: page_cleaner: 1000ms intended loop took 2868086ms. The settings might not be optimal. (flushed=0 and evicted=0, during the time.)
2020-01-18T03:17:10.403347Z 0 [Note] InnoDB: page_cleaner: 1000ms intended loop took 113439ms. The settings might not be optimal. (flushed=0 and evicted=0, during the time.)
2020-01-18T04:19:50.025641Z 0 [Note] Giving 0 client threads a chance to die gracefully
2020-01-18T04:19:50.026067Z 0 [Note] Shutting down slave threads
2020-01-18T04:19:50.026406Z 0 [Note] Forcefully disconnecting 0 remaining clients
2020-01-18T04:19:50.026859Z 0 [Note] Event Scheduler: Purging the queue. 0 events
2020-01-18T04:19:50.028486Z 0 [Note] Binlog end
2020-01-18T04:19:50.266455Z 0 [Note] Shutting down plugin 'ngram'
2020-01-18T04:19:50.266534Z 0 [Note] Shutting down plugin 'partition'
2020-01-18T04:19:50.266547Z 0 [Note] Shutting down plugin 'BLACKHOLE'
2020-01-18T04:19:50.266558Z 0 [Note] Shutting down plugin 'ARCHIVE'
2020-01-18T04:19:50.266566Z 0 [Note] Shutting down plugin 'PERFORMANCE_SCHEMA'
2020-01-18T04:19:50.278568Z 0 [Note] Shutting down plugin 'MRG_MYISAM'
2020-01-18T04:19:50.278607Z 0 [Note] Shutting down plugin 'MyISAM'
2020-01-18T04:19:50.278712Z 0 [Note] Shutting down plugin 'INNODB_SYS_VIRTUAL'
2020-01-18T04:19:50.284742Z 0 [Note] Shutting down plugin 'INNODB_SYS_DATAFILES'
2020-01-18T04:19:50.284768Z 0 [Note] Shutting down plugin 'INNODB_SYS_TABLESPACES'
2020-01-18T04:19:50.284780Z 0 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN_COLS'
2020-01-18T04:19:50.284789Z 0 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN'
2020-01-18T04:19:50.284796Z 0 [Note] Shutting down plugin 'INNODB_SYS_FIELDS'
2020-01-18T04:19:50.284803Z 0 [Note] Shutting down plugin 'INNODB_SYS_COLUMNS'
2020-01-18T04:19:50.284810Z 0 [Note] Shutting down plugin 'INNODB_SYS_INDEXES'
2020-01-18T04:19:50.284817Z 0 [Note] Shutting down plugin 'INNODB_SYS_TABLESTATS'
2020-01-18T04:19:50.284824Z 0 [Note] Shutting down plugin 'INNODB_SYS_TABLES'
2020-01-18T04:19:50.284831Z 0 [Note] Shutting down plugin 'INNODB_FT_INDEX_TABLE'
2020-01-18T04:19:50.284838Z 0 [Note] Shutting down plugin 'INNODB_FT_INDEX_CACHE'
2020-01-18T04:19:50.284846Z 0 [Note] Shutting down plugin 'INNODB_FT_CONFIG'
2020-01-18T04:19:50.284855Z 0 [Note] Shutting down plugin 'INNODB_FT_BEING_DELETED'
2020-01-18T04:19:50.284863Z 0 [Note] Shutting down plugin 'INNODB_FT_DELETED'
2020-01-18T04:19:50.284870Z 0 [Note] Shutting down plugin 'INNODB_FT_DEFAULT_STOPWORD'
2020-01-18T04:19:50.284877Z 0 [Note] Shutting down plugin 'INNODB_METRICS'
2020-01-18T04:19:50.284884Z 0 [Note] Shutting down plugin 'INNODB_TEMP_TABLE_INFO'
2020-01-18T04:19:50.284891Z 0 [Note] Shutting down plugin 'INNODB_BUFFER_POOL_STATS'
2020-01-18T04:19:50.284898Z 0 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE_LRU'
2020-01-18T04:19:50.284906Z 0 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE'
2020-01-18T04:19:50.284913Z 0 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX_RESET'
2020-01-18T04:19:50.284920Z 0 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX'
2020-01-18T04:19:50.284930Z 0 [Note] Shutting down plugin 'INNODB_CMPMEM_RESET'
2020-01-18T04:19:50.284937Z 0 [Note] Shutting down plugin 'INNODB_CMPMEM'
2020-01-18T04:19:50.284944Z 0 [Note] Shutting down plugin 'INNODB_CMP_RESET'
2020-01-18T04:19:50.284964Z 0 [Note] Shutting down plugin 'INNODB_CMP'
2020-01-18T04:19:50.284980Z 0 [Note] Shutting down plugin 'INNODB_LOCK_WAITS'
2020-01-18T04:19:50.284987Z 0 [Note] Shutting down plugin 'INNODB_LOCKS'
2020-01-18T04:19:50.284994Z 0 [Note] Shutting down plugin 'INNODB_TRX'
2020-01-18T04:19:50.285009Z 0 [Note] Shutting down plugin 'InnoDB'
2020-01-18T04:19:50.302153Z 0 [Note] InnoDB: FTS optimize thread exiting.
2020-01-18T04:19:50.302324Z 0 [Note] InnoDB: Starting shutdown...
2020-01-18T04:19:50.448900Z 0 [Note] InnoDB: Dumping buffer pool(s) to /usr/local/var/mysql/ib_buffer_pool
2020-01-18T04:19:50.455916Z 0 [Note] InnoDB: Buffer pool(s) dump completed at 200117 23:19:50
2020-01-18T04:19:51.352113Z 0 [Note] InnoDB: Shutdown completed; log sequence number 26072066420
2020-01-18T04:19:51.354829Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2020-01-18T04:19:51.354892Z 0 [Note] Shutting down plugin 'MEMORY'
2020-01-18T04:19:51.355317Z 0 [Note] Shutting down plugin 'CSV'
2020-01-18T04:19:51.355373Z 0 [Note] Shutting down plugin 'sha256_password'
2020-01-18T04:19:51.355402Z 0 [Note] Shutting down plugin 'mysql_native_password'
2020-01-18T04:19:51.356443Z 0 [Note] Shutting down plugin 'binlog'
2020-01-18T04:19:51.364593Z 0 [Note] /usr/local/opt/mysql/bin/mysqld: Shutdown complete
2020-01-18T04:21:20.6NZ mysqld_safe Logging to '/usr/local/var/mysql/Roberts-MBP-4.fios-router.home.err'.
2020-01-18T04:21:21.6NZ mysqld_safe Starting mysqld daemon with databases from /usr/local/var/mysql
2020-01-18T04:21:22.464837Z 0 [System] [MY-010116] [Server] /usr/local/opt/mysql/bin/mysqld (mysqld 8.0.18) starting as process 773
2020-01-18T04:21:23.267083Z 0 [Warning] [MY-010159] [Server] Setting lower_case_table_names=2 because file system for /usr/local/var/mysql/ is case insensitive
2020-01-18T04:21:24.347624Z 1 [System] [MY-011012] [Server] Starting upgrade of data directory.
2020-01-18T04:22:10.697989Z 2 [System] [MY-011003] [Server] Finished populating Data Dictionary tables with data.
2020-01-18T04:22:12.302757Z 5 [System] [MY-013381] [Server] Server upgrade from '50700' to '80018' started.
2020-01-18T04:22:20.760953Z 5 [System] [MY-013381] [Server] Server upgrade from '50700' to '80018' completed.
2020-01-18T04:22:20.869345Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2020-01-18T04:22:20.901909Z 0 [System] [MY-010931] [Server] /usr/local/opt/mysql/bin/mysqld: ready for connections. Version: '8.0.18' socket: '/tmp/mysql.sock' port: 3306 Homebrew.
2020-01-18T04:22:21.087121Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Socket: '/tmp/mysqlx.sock' bind-address: '::' port: 33060
2020-01-18T18:40:40.6NZ mysqld_safe Logging to '/usr/local/var/mysql/Roberts-MBP-4.fios-router.home.err'.
2020-01-18T18:40:40.6NZ mysqld_safe A mysqld process already exists
2020-01-18T18:40:42.139017Z 0 [System] [MY-010910] [Server] /usr/local/opt/mysql/bin/mysqld: Shutdown complete (mysqld 8.0.18) Homebrew.
2020-01-18T18:40:50.6NZ mysqld_safe Logging to '/usr/local/var/mysql/Roberts-MBP-4.fios-router.home.err'.
2020-01-18T18:40:50.6NZ mysqld_safe Starting mysqld daemon with databases from /usr/local/var/mysql
2020-01-18T18:40:50.703294Z 0 [System] [MY-010116] [Server] /usr/local/opt/mysql/bin/mysqld (mysqld 8.0.18) starting as process 15000
2020-01-18T18:40:50.709793Z 0 [Warning] [MY-010159] [Server] Setting lower_case_table_names=2 because file system for /usr/local/var/mysql/ is case insensitive
2020-01-18T18:40:51.867098Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2020-01-18T18:40:51.893469Z 0 [System] [MY-010931] [Server] /usr/local/opt/mysql/bin/mysqld: ready for connections. Version: '8.0.18' socket: '/tmp/mysql.sock' port: 3306 Homebrew.
2020-01-18T18:40:52.023790Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Socket: '/tmp/mysqlx.sock' bind-address: '::' port: 33060
2020-01-18T18:53:44.6NZ mysqld_safe Logging to '/usr/local/var/mysql/Roberts-MBP-4.fios-router.home.err'.
2020-01-18T18:53:44.6NZ mysqld_safe A mysqld process already exists
2020-01-18T18:53:45.316518Z 0 [System] [MY-010910] [Server] /usr/local/opt/mysql/bin/mysqld: Shutdown complete (mysqld 8.0.18) Homebrew.
2020-01-18T18:53:54.6NZ mysqld_safe Logging to '/usr/local/var/mysql/Roberts-MBP-4.fios-router.home.err'.
2020-01-18T18:53:54.6NZ mysqld_safe Starting mysqld daemon with databases from /usr/local/var/mysql
2020-01-18T18:53:55.004674Z 0 [System] [MY-010116] [Server] /usr/local/opt/mysql/bin/mysqld (mysqld 8.0.18) starting as process 17779
2020-01-18T18:53:55.011065Z 0 [Warning] [MY-010159] [Server] Setting lower_case_table_names=2 because file system for /usr/local/var/mysql/ is case insensitive
2020-01-18T18:53:57.547543Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2020-01-18T18:53:57.573755Z 0 [System] [MY-010931] [Server] /usr/local/opt/mysql/bin/mysqld: ready for connections. Version: '8.0.18' socket: '/tmp/mysql.sock' port: 3306 Homebrew.
2020-01-18T18:53:57.706901Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Socket: '/tmp/mysqlx.sock' bind-address: '::' port: 33060
酿造服务列表
当我运行brew services list 时，我看到mysql 的状态为error：
$ brew services list
Name Status User Plist
chromedriver stopped
docker-machine stopped
elasticsearch started robskrob /Users/robskrob/Library/LaunchAgents/homebrew.mxcl.elasticsearch.plist
elasticsearch@2.4 stopped
httpd stopped
mysql error robskrob /Users/robskrob/Library/LaunchAgents/homebrew.mxcl.mysql.plist
nginx stopped
php started robskrob /Users/robskrob/Library/LaunchAgents/homebrew.mxcl.php.plist
postgresql stopped
rabbitmq stopped
redis started robskrob /Users/robskrob/Library/LaunchAgents/homebrew.mxcl.redis.plist
MySQL 终端会话
我可以在我的 zshell 中输入mysql 控制台会话：
$ mysql -uroot
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 11
Server version: 8.0.18 Homebrew
Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show tables;
ERROR 1046 (3D000): No database selected
mysql> use myblog_development;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> show tables;
这告诉我，在某种程度上，mysql 似乎正在运行，但我的 wordpress 应用无法建立与它的连接。
系统日志
当我在我的机器上打印出系统日志时，我看到了这些关于mysql 的奇怪日志：
Jan 18 13:53:44 Roberts-MBP-4 com.apple.xpc.launchd[1] (homebrew.mxcl.mysql[14913]): Service did not exit 5 seconds after SIGTERM. Sending SIGKILL.
Jan 18 13:53:44 Roberts-MBP-4 com.apple.xpc.launchd[1] (homebrew.mxcl.mysql): This service is defined to be constantly running and is inherently inefficient.
Jan 18 13:53:44 Roberts-MBP-4 com.apple.xpc.launchd[1] (homebrew.mxcl.mysql[17411]): Service exited with abnormal code: 1
Jan 18 13:53:44 Roberts-MBP-4 com.apple.xpc.launchd[1] (homebrew.mxcl.mysql): Service only ran for 0 seconds. Pushing respawn out by 10 seconds.
自制论坛
自制论坛中似乎有类似的logged issue。
更新 1
按照here的指示，我运行了这些命令，看看mysql的运行状态是否会改善：
$ launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
/Users/robskrob/Library/LaunchAgents/homebrew.mxcl.mysql.plist: Operation now in progress
$ launchctl remove ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
$ rm ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
结果，当我运行brew services list 时，我现在看到mysql 处于更好的状态——mysql 从error 变为started 并一直停留在started:
mysql 启动了 robskrob /Users/robskrob /Library/LaunchAgents/homebrew.mxcl.mysql.plist`
然而，wordpress 仍然无法连接到 mysql。
来自 System.log 的 mysql 的新日志是：
Jan 18 14:36:05 Roberts-MBP-4 com.apple.xpc.launchd[1] (homebrew.mxcl.mysql): This service is defined to be constantly running and is inherently inefficient.
Jan 18 14:48:44 Roberts-MBP-4 com.apple.xpc.launchd[1] (homebrew.mxcl.mysql): This service is defined to be constantly running and is inherently inefficient.
【问题讨论】：
标签： mysql wordpress macos homebrew