默认使用 brew install nginx 出现了一下的错误：
localhost:testdj newstart$ brew install nginx
==> Installing dependencies for nginx: openssl, pare
==> Installing nginx dependency: openssl
==> Downloading https://homebrew.bintray.com/bottles/openssl-1.0.2n.high_sierra.
######################################################################## 100.0%
==> Pouring openssl-1.0.2n.high_sierra.bottle.tar.gz
Error: Failed to create /usr/local/opt/openssl
Things that depend on openssl will probably not build.
Could not symlink .
/usr/local/opt is not writable.
Warning: The post-install step did not complete successfully
You can try again using `brew postinstall openssl`
==> 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:$PATH"' >> ~/.bash_profile
For compilers to find this software you may need to set:
LDFLAGS: -L/usr/local/opt/openssl/lib
CPPFLAGS: -I/usr/local/opt/openssl/include
==> Summary
? /usr/local/Cellar/openssl/1.0.2n: 1,792 files, 12.3MB
==> Installing nginx dependency: pcre
==> Downloading https://homebrew.bintray.com/bottles/pcre-8.41.high_sierra.bottl
######################################################################## 100.0%
==> Pouring pcre-8.41.high_sierra.bottle.tar.gz
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink .
/usr/local/opt is not writable.
You can try again using:
brew link pcre
==> Summary
? /usr/local/Cellar/pcre/8.41: 204 files, 5.3MB
==> Installing nginx
==> Downloading https://homebrew.bintray.com/bottles/nginx-1.12.2_1.high_sierra.
######################################################################## 100.0%
==> Pouring nginx-1.12.2_1.high_sierra.bottle.tar.gz
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink .
/usr/local/opt is not writable.
You can try again using:
brew link nginx
Warning: The post-install step did not complete successfully
You can try again using `brew postinstall nginx`
==> Caveats
Docroot is: /usr/local/var/www
The default port has been set in /usr/local/etc/nginx/nginx.conf to 8080 so that
nginx can run without sudo.
nginx will load all files in /usr/local/etc/nginx/servers/.
To have launchd start nginx now and restart at login:
brew services start nginx
Or, if you don't want/need a background service you can just run:
nginx
==> Summary
? /usr/local/Cellar/nginx/1.12.2_1: 25 files, 1MB
localhost:testdj newstart$ /usr/local/webserver/nginx/sbin/nginx -v
-bash: /usr/local/webserver/nginx/sbin/nginx: No such file or directory
localhost:testdj newstart$ /usr/local/Cellar/nginx/sbin/nginx -v
-bash: /usr/local/Cellar/nginx/sbin/nginx: No such file or directory
localhost:testdj newstart$ brew postinstall nginx
==> Postinstalling nginx
Error: Permission denied @ dir_s_mkdir - /usr/local/etc
localhost:testdj newstart$ sudo chown -R $(whoami) /usr/local/etc/
chown: /usr/local/etc/: No such file or directory
localhost:testdj newstart$ sudo chown -R $(whoami) /usr/local
chown: /usr/local: Operation not permitted
localhost:testdj newstart$ sudo chown -R $(whoami) /usr/local/
chown: /usr/local/: Operation not permitted
localhost:testdj newstart$ nginx
-bash: nginx: command not found
localhost:testdj newstart$ sudo nginx
sudo: nginx: command not found
localhost:testdj newstart$
然后就是浩浩荡荡的解决之路：
首先如果出现一些目录没有权限的问题：直接使用 sudo chown -R $(whoami) /usr/local/opt(这个目录就是需要赋予权限的目录),往后所有需要给目录赋权限的使用，直接使用这个，比如，提示Error: Failed to create /usr/local/opt/openssl 直接使用上面的命令
1. openssl 无法link成功
在试过很多方法之后，比如 添加 --force 参数，仍旧无解的情况下，google给了我希望
删除 /usr/local/Cellar/openssl路径，可是删除之后重新使用 brew install openssl 仍旧失败
继续，删除 rm -rf /usr/local/opt/openssl
重新使用 brew install openssl。成功
2. 启动nginx 仍旧失败
查看只有发现是 没有 link pcre
使用命令：brew link pcre
3. 这样修改之后，仍旧失败
启动后，显示
nginx: [alert] could not open error log file: open() "/usr/local/var/log/nginx/error.log" failed (2: No such file or directory)
2017/12/26 15:47:00 [emerg] 36666#0: open() "/usr/local/nginx/conf/nginx.conf" failed (2: No such file or directory)
这个时候，执行 brew postinstall nginx
解决
4. 访问 localhost:8080 显示成功