Brew 安装MySQL后，将配置文件my.cnf 添加到/etc/my.cnf后启动服务报错(The server quit without updating PID file……)_brew mysql my.cnf

 brew install mysql后并没有进行my.cnf配置，所有新建了个my.cnf文件将以前的配置项都添加到了这个配置文件中，然后重启MySQL服务，结果就报错了

. ERROR! The server quit without updating PID file (/usr/local/var/mysql/bogon.pid).

网上找了资料，并没有解决我的问题，后面只能是逐一排查

这是我的配置文件(/etc/my.cnf)简单的内容

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html
# *** DO NOT EDIT THIS FILE. It's a template which will be copied to the
# *** default location during install, and will be replaced if you
# *** upgrade to a newer version of MySQL.
[client]
default-character-set=utf8mb4
 
[mysql]
default-character-set=utf8mb4
 
[mysqld]
character-set-client-handshake = FALSE 
character-set-server = utf8mb4 
collation-server = utf8mb4_unicode_ci 
init_connect='SET NAMES utf8mb4'
lower_case_table_names=1
 
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
 
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
 
# These are commonly set, remove the # and set as required.
# basedir = .....
# datadir = .....
# port = .....
# server_id = .....
# socket = .....
 
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M 
 
sql_mode = "STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER"

启动MySQL服务

$ mysql.server start
Starting MySQL
.. ERROR! The server quit without updating PID file (/usr/local/var/mysql/bogon.pid).

就发现包这个错误，尝试了各种办法授权目录，等等没结果，后面只能是逐一排查my.cnf文件里面的配置，结果真的是这个配置文件里面的问题，我一行一行的注释后再启动，终于在注释以下两个配置项后，终于不报这个错误了。

# lower_case_table_names=1
 
# sql_mode = "STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER"
 
或者将sql_mode中的NO_AUTO_CREATE_USER去掉也可以

然后启动错误不报但又有以下的提示信息 

$ mysql.server start
Starting MySQL
 SUCCESS! 
bogon:~ liwu$ 2019-06-19T08:17:38.6NZ mysqld_safe A mysqld process already exists

出现这种提示的时候可以使用Brew service来操作MySQL服务，先停止MySQL服务

$ brew services stop mysql 
Stopping `mysql`... (might take a while)
==> Successfully stopped `mysql` (label: homebrew.mxcl.mysql)
bogon:~ liwu$ mysql.server start
Starting MySQL
. SUCCESS! 

至此此问题终于得到了一个解答

总结：

我觉得出现这种现象有几种种可能

1、我的MySQL不是在官网下载对应兼容版本的*.dmg安装包

2、我是采用的HomeBrew方式安装的，没有原始安装包那么齐全

3、有可能是MySQL版本的问题，我现在的版本是MySQL-8.0.16，但这个怀疑还得得到验证