今天突然啓動 mysql 報錯
$ 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
有時啓動其他軟件也會報這個錯誤，比如 nginx
原因：
這個是由於 openssl 的版本影響到的。
因爲 brew install python3安裝python3後導致openssl升級到1.1，但mysqldump還是依賴的1.0.0，從而導致mysqldump時提示
dyld: Library not loaded: /usr/local/opt/openssl/lib/libssl.1.0.0.dylib
再次把版本降回來即可。
解決辦法：
使用 brew switch openssl 1.0.2s
如果執行命令後報這個錯
$ 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解決下,根據提示來操作就好
結果：
安裝完成即可連接 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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