今天突然启动 mysql 报错
$ mysql -uroot -p
dyld: Library not loaded: /usr/local/opt/openssl/lib/libssl.1.0.0.dylib
Referenced from: /usr/local/bin/mysql
Reason: image not found
[1] 97293 abort mysql -uroot -p
有时启动其他软件也会报这个错误，比如 nginx
原因：
这个是由于 openssl 的版本影响到的。
因为 brew install python3安装python3后导致openssl升级到1.1，但mysqldump还是依赖的1.0.0，从而导致mysqldump时提示
dyld: Library not loaded: /usr/local/opt/openssl/lib/libssl.1.0.0.dylib
再次把版本降回来即可。
解决办法：
使用 brew switch openssl 1.0.2s
如果执行命令后报这个错
$ brew switch openssl 1.0.2s
Error: openssl does not have a version "1.0.2s" in the Cellar.
openssl's installed versions: 1.0.2r
可以按照提示使用 1.0.2m，1.0.2n 或者 1.0.2r解决下,根据提示来操作就好
结果：
安装完成即可连接 mysql 了
$ brew switch openssl 1.0.2r
Cleaning /usr/local/Cellar/openssl/1.0.2r
Opt link created for /usr/local/Cellar/openssl/1.0.2r
$ mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.16 Homebrew
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