macbook install mysql

1. 安装Homebrew，详细步骤参见Homebrew官网。
2. brew doctor确认brew在正常工作。
3. brew update更新包。
4. brew install mysql 安装mysql。log如下：

   ==> Installing dependencies for mysql: openssl
   ==> Installing mysql dependency: openssl
   ==> Downloading https://homebrew.bintray.com/bottles/openssl-1.0.2l.sierra.bottle.tar.gz
   ######################################################################## 100.0%
   ==> Pouring openssl-1.0.2l.sierra.bottle.tar.gz
   ==> Using the sandbox
   ==> Caveats
   A CA file has been bootstrapped using certificates from the SystemRoots
   keychain. To add additional certificates (e.g. the certificates added in
   the System keychain), place .pem files in
   /usr/local/etc/openssl/certs

   and run
   /usr/local/opt/openssl/bin/c_rehash

   This formula is keg-only, which means it was not symlinked into /usr/local,
   because Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries.

   If you need to have this software first in your PATH run:
   echo 'export PATH="/usr/local/opt/openssl/bin:$PATH"' >> ~/.bash_profile

   For compilers to find this software you may need to set:
   LDFLAGS: -L/usr/local/opt/openssl/lib
   CPPFLAGS: -I/usr/local/opt/openssl/include

   ==> Summary