YAML safe loading is not available. Please upgrade psych to a version that supports safe loading (>= 2.0).

升级到 xcode9.0 之后使用 安装cocoapods 会出现如下情况:

Air:~ Jniying$ sudo gem install cocoapods
Password:
YAML safe loading is not available. Please upgrade psych to a version that supports safe loading (>= 2.0).
ERROR:  Could not find a valid gem 'cocoapods' (>= 0), here is why:
          Unable to download data from https://gems.ruby-china.org/ - Errno::ECONNREFUSED: Connection refused - connect(2) (https://gems.ruby-china.org/specs.4.8.gz)

YAML safe loading is not available. Please upgrade psych to a version that supports safe loading (>= 2.0). 这个是什么鬼??

查看ruby版本

rvm list known
[ruby-]1.8.6[-p420]
[ruby-]1.8.7[-head] # security released on head
[ruby-]1.9.1[-p431]
[ruby-]1.9.2[-p330]
[ruby-]1.9.3[-p551]
[ruby-]2.0.0[-p648]
[ruby-]2.1[.10]
[ruby-]2.2[.7]
[ruby-]2.3[.4]
[ruby-]2.4[.1]

我当前版本是 2.0.0
尝试去更新 ruby 到最新的

rvm install 2.4.1
Searching for binary rubies, this might take some time.
No binary rubies available for: osx/10.12/x86_64/ruby-2.4.1.
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
Checking requirements for osx.
Installing requirements for osx.
Updating system.........
Installing required packages: autoconf, automake, libtool, pkg-config, coreutils, libyaml, readline, libksba, openssl@1.1..There were package installation errors, make sure to read the log.

Try `brew tap --repair` and make sure `brew doctor` looks reasonable.
-
Check Homebrew requirements https://github.com/Homebrew/homebrew/wiki/Installation
..
Error running 'requirements_osx_brew_libs_install autoconf automake libtool pkg-config coreutils libyaml readline libksba openssl@1.1',
please read /Users/Jniying/.rvm/log/1512703462_ruby-2.4.1/package_install_autoconf_automake_libtool_pkg-config_coreutils_libyaml_readline_libksba_openssl@1.1.log
Requirements installation failed with status: 1.

表示好难过 更新不了rudy 就 安装不了cocoapods

新大陆: Try brew tap --repair and make sure brew doctor looks reasonable.

尝试一下 这个两个命名:

brew doctor
//叫我们下载下面的工具
Warning: Xcode alone is not sufficient on Sierra.
Install the Command Line Tools:
  xcode-select --install

//xcode 9.0冲突
Warning: Your Xcode (9.0.1) is outdated.
Please update to Xcode 9.1 (or delete it).
Xcode can be updated from the App Store.

// openssl 冲突
Warning: Some installed formula are missing dependencies.
You should `brew install` the missing dependencies:
  brew install openssl

下载 Install the Command Line Tools

xcode-select --install

跳出一个窗口下载, 完成之后

brew install openssl
==> Downloading https://homebrew.bintray.com/bottles/openssl-1.0.2n.sierra.bottl
######################################################################## 100.0%
==> Pouring openssl-1.0.2n.sierra.bottle.tar.gz
==> 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

更新完 openssl

再次尝试 安装最新的rudy

rvm install 2.4.1
Searching for binary rubies, this might take some time.
No binary rubies available for: osx/10.12/x86_64/ruby-2.4.1.
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
Checking requirements for osx.
Installing requirements for osx.
Updating system.........
Installing required packages: autoconf, automake, libtool, pkg-config, coreutils, libyaml, readline, libksba, openssl@1.1.........
Certificates bundle '/usr/local/etc/openssl@1.1/cert.pem' is already up to date.
Requirements installation successful.
Installing Ruby from source to: /Users/Jniying/.rvm/rubies/ruby-2.4.1, this may take a while depending on your cpu(s)...
ruby-2.4.1 - #downloading ruby-2.4.1, this may take a while depending on your connection...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 11.9M  100 11.9M    0     0  13809      0  0:15:10  0:15:10 --:--:-- 10573
ruby-2.4.1 - #extracting ruby-2.4.1 to /Users/Jniying/.rvm/src/ruby-2.4.1....
ruby-2.4.1 - #applying patch /Users/Jniying/.rvm/patches/ruby/2.4.1/random_c_using_NR_prefix.patch.
ruby-2.4.1 - #configuring......................................................-
ruby-2.4.1 - #post-configuration.
ruby-2.4.1 - #compiling........................................................-
ruby-2.4.1 - #installing.......
ruby-2.4.1 - #making binaries executable..
ruby-2.4.1 - #downloading rubygems-2.6.14
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  751k  100  751k    0     0   676k      0  0:00:01  0:00:01 --:--:--  676k
No checksum for downloaded archive, recording checksum in user configuration.
ruby-2.4.1 - #extracting rubygems-2.6.14....
ruby-2.4.1 - #removing old rubygems.........
ruby-2.4.1 - #installing rubygems-2.6.14...........................
ruby-2.4.1 - #gemset created /Users/Jniying/.rvm/gems/ruby-2.4.1@global
ruby-2.4.1 - #importing gemset /Users/Jniying/.rvm/gemsets/global.gems.........|
ruby-2.4.1 - #generating global wrappers........
ruby-2.4.1 - #gemset created /Users/Jniying/.rvm/gems/ruby-2.4.1
ruby-2.4.1 - #importing gemsetfile /Users/Jniying/.rvm/gemsets/default.gems evaluated to empty gem list
ruby-2.4.1 - #generating default wrappers........
ruby-2.4.1 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake).
Install of ruby-2.4.1 - #complete 
Ruby was built without documentation, to build it run: rvm docs generate-ri

成功了.

安装 cocoapods

sudo gem install cocoapods

完美谢幕.

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