我正在尝试在mac os 10.6上使用Homebrew by brew安装MySQL 5.1.52。
一切都很顺利，我也成功地使用mysql_install_db。
然而，当我试图连接到服务器使用:
/usr/local/Cellar/mysql/5.1.52/bin/mysqladmin -u root password 'mypass'
我得到:
/usr/local/Cellar/mysql/5.1.52/bin/mysqladmin: connect to server at 'localhost'
failed error: 'Access denied for user 'root'@'localhost' (using password: NO)'
我尝试访问mysqladmin或mysql使用-u root - root以及，
但是有没有密码都不行。
这是全新机器上的全新安装，据我所知，新安装必须在没有根密码的情况下访问。我还试过:
/usr/local/Cellar/mysql/5.1.52/bin/mysql_secure_installation
但我也得到了
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
下面是MySQL 5.7的更新
bash --version
GNU bash, version 4.4.12(1)-release (x86_64-apple-darwin17.0.0)
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
#========================================
brew --version
Homebrew 1.7.6
Homebrew/homebrew-core (git revision eeb08; last commit 2018-09-27)
Homebrew/homebrew-cask (git revision c9f62; last commit 2018-09-27)
#========================================
mysql --version
mysql Ver 14.14 Distrib 5.7.23, for osx10.13 (x86_64) using EditLine wrapper
#========================================
system_profiler SPSoftwareDataType
Software:
System Software Overview:
System Version: macOS 10.13.3 (17D47)
Kernel Version: Darwin 17.4.0
Boot Volume: Macintosh HD
Boot Mode: Normal
Computer Name: EdisonMacHomeBj
User Name: Edison (edison)
Secure Virtual Memory: Enabled
System Integrity Protection: Disabled
Time since boot: 6 days 23:13
brew remove mysql@5.7
brew cleanup
mv /usr/local/var/mysql /usr/local/var/mysql.bak
brew install mysql@5.7
rm -rf /usr/local/var/mysql
#========================================
mysqld --initialize
2018-09-28T04:54:06.526061Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-09-28T04:54:06.542625Z 0 [Warning] Setting lower_case_table_names=2 because file system for /usr/local/var/mysql/ is case insensitive
2018-09-28T04:54:07.096637Z 0 [Warning] InnoDB: New log files created, LSN=45790
2018-09-28T04:54:07.132950Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.
2018-09-28T04:54:07.196824Z 0 [Warning] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: 87cf2f10-c2da-11e8-ac2d-ba163df10130.
2018-09-28T04:54:07.224871Z 0 [Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.
2018-09-28T04:54:07.366688Z 0 [Warning] CA certificate ca.pem is self signed.
2018-09-28T04:54:07.457954Z 1 [Note] A temporary password is generated for root@localhost: kq3K=JR8;GqZ
#========================================
mysql_secure_installation -uroot -p"kq3K=JR8;GqZ"
mysql_secure_installation: [Warning] Using a password on the command line interface can be insecure.
Securing the MySQL server deployment.
The existing password for the user account root has expired. Please set a new password.
New password:
Re-enter new password:
VALIDATE PASSWORD PLUGIN can be used to test passwords
and improve security. It checks the strength of password
and allows the users to set only those passwords which are
secure enough. Would you like to setup VALIDATE PASSWORD plugin?
Press y|Y for Yes, any other key for No: n
Using existing password for root.
Change the password for root ? ((Press y|Y for Yes, any other key for No) : y
New password:
Re-enter new password:
By default, a MySQL installation has an anonymous user,
allowing anyone to log into MySQL without having to have
a user account created for them. This is intended only for
testing, and to make the installation go a bit smoother.
You should remove them before moving into a production
environment.
Remove anonymous users? (Press y|Y for Yes, any other key for No) : y
Success.
Normally, root should only be allowed to connect from
'localhost'. This ensures that someone cannot guess at
the root password from the network.
Disallow root login remotely? (Press y|Y for Yes, any other key for No) : n
... skipping.
By default, MySQL comes with a database named 'test' that
anyone can access. This is also intended only for testing,
and should be removed before moving into a production
environment.
Remove test database and access to it? (Press y|Y for Yes, any other key for No) : n
... skipping.
Reloading the privilege tables will ensure that all changes
made so far will take effect immediately.
Reload privilege tables now? (Press y|Y for Yes, any other key for No) : y
Success.
All done!
我认为如果已经安装了旧版本的mysql，就会出现这种情况。我也遇到了同样的问题，上面的解决方案对我都不起作用。我是这样安排的:
使用brew的remove & cleanup命令，卸载launchctl脚本，然后删除mysql目录在/usr/local/var，删除我现有的/etc/my.cnf(留给你，如果它适用)和launchctl plist
更新plist的字符串。还要注意，您的备用安全脚本目录将基于您正在安装的MySQL版本。
循序渐进:
brew remove mysql
brew cleanup
launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
rm ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
sudo rm -rf /usr/local/var/mysql
然后我从头开始:
installed mysql with brew install mysql
ran the commands brew suggested: (see note: below)
unset TMPDIR
mysql_install_db --verbose --user=`whoami` --basedir="$(brew --prefix mysql)" --datadir=/usr/local/var/mysql --tmpdir=/tmp
Start mysql with mysql.server start command, to be able to log on it
Used the alternate security script:
/usr/local/Cellar/mysql/5.5.10/bin/mysql_secure_installation
Followed the launchctl section from the brew package script output such as,
#start
launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
#stop
launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
注意:啤酒清理的——force位也会清理过时的酒桶，这是一个新的自制啤酒功能。
注意第二点:一个评论者说第二步不是必需的。我不想测试它，所以是YMMV!
下面是Sedorner上面写的关于如何从你的Mac上删除所有MySQL，然后用Brew Way安装它的详细说明:
根据技术实验室完全删除MySQL
ps -ax | grep mysql
stop and kill any MySQL processes
sudo rm /usr/local/mysql
sudo rm -rf /usr/local/var/mysql
sudo rm -rf /usr/local/mysql*
sudo rm ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
sudo rm -rf /Library/StartupItems/MySQLCOM
sudo rm -rf /Library/PreferencePanes/My*
launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
edit /etc/hostconfig and remove the line MYSQLCOM=-YES-
rm -rf ~/Library/PreferencePanes/My*
sudo rm -rf /Library/Receipts/mysql*
sudo rm -rf /Library/Receipts/MySQL*
sudo rm -rf /private/var/db/receipts/*mysql*
sudo rm -rf /tmp/mysql*
try to run mysql, it shouldn't work
从这个StackOverflow的答案酿造安装MySQL每用户Sedorner
酿造医生和修复任何错误
Brew remove mysql
啤酒清理
酿造更新
安装mysql
设置TMPDIR
Mysql_install_db——verbose——user= ' whoami '——basedir="$(brew——prefix mysql)"——datadir=/usr/local/var/mysql——tmpdir=/tmp # whoami inline执行
mysql。服务器启动
运行Brew建议的命令，将MySQL添加到launchctl中，以便在启动时自动启动
Mysql现在应该可以正常工作并一直正常运行
祝成功。
只是在之前的回答中添加一些东西-当从MySql 5.6升级到MySql 8.0时，我遵循了这里提供的步骤来进行干净的卸载，但我得到了以下错误
2019-11-05T07:57:31.359304Z 0 [ERROR] [MY-000077] [Server] /usr/local/Cellar/mysql/8.0.18/bin/mysqld: Error while setting value 'ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION' to 'sql_mode'.
2019-11-05T07:57:31.359330Z 0 [ERROR] [MY-013236] [Server] The designated data directory /usr/local/var/mysql is unusable. You can remove all files that the server added to it.
2019-11-05T07:57:31.359413Z 0 [ERROR] [MY-010119] [Server] Aborting
2019-11-05T07:57:31.359514Z 0 [Note] [MY-010120] [Server] Binlog end
我花了些时间才想明白。在这里找到了一个线索:
https://discourse.brew.sh/t/clean-removal-of-mysql/2251
因此，我的问题的关键是在卸载后删除/usr/local/etc/my.cnf文件。
在完成最后一步之后，MySql终于开始工作了。
