报错：There was an error while trying to load the gem 'uglifier'. (Bundler::GemRequireError)
事实上我们系统里已经有了这个gem
代码语言：javascript复制[root@h202 blog]# bundle list | grep uglifier
* uglifier (3.0.0)
[root@h202 blog]# 那为什么会报错呢，原因是 uglifier 这个包，其实是 JS 的一层包装，它需要 JS的运行环境或者JS的解释器
Uglifier minifies JavaScript files by wrapping UglifyJS to be accessible in Ruby
解决方法是安装 NodeJS
代码语言：javascript复制[root@h202 blog]# yum install nodejs
Loaded plugins: fastestmirror, refresh-packagekit, security
Setting up Install Process
Repository base is listed more than once in the configuration
Loading mirror speeds from cached hostfile
epel/metalink | 3.8 kB 00:00
* base: mirrors.aliyun.com
* epel: mirrors.opencas.cn
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
base | 3.7 kB 00:00
extras | 3.4 kB 00:00
percona-release-noarch | 2.5 kB 00:00
percona-release-x86_64 | 2.5 kB 00:00
updates | 3.4 kB 00:00
zabbix | 951 B 00:00
zabbix-non-supported | 951 B 00:00
Resolving Dependencies
--> Running transaction check
---> Package nodejs.x86_64 0:0.10.42-4.el6 will be installed
--> Processing Dependency: libuv.so.0.10()(64bit) for package: nodejs-0.10.42-4.el6.x86_64
--> Running transaction check
---> Package libuv.x86_64 1:0.10.34-1.el6 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
====================================================================================================================================
Package Arch Version Repository Size
====================================================================================================================================
Installing:
nodejs x86_64 0.10.42-4.el6 epel 2.1 M
Installing for dependencies:
libuv x86_64 1:0.10.34-1.el6 epel 57 k
Transaction Summary
====================================================================================================================================
Install 2 Package(s)
Total download size: 2.1 M
Installed size: 7.2 M
Is this ok [y/N]: y
Downloading Packages:
(1/2): libuv-0.10.34-1.el6.x86_64.rpm | 57 kB 00:00
(2/2): nodejs-0.10.42-4.el6.x86_64.rpm | 2.1 MB 00:13
------------------------------------------------------------------------------------------------------------------------------------
Total 147 kB/s | 2.1 MB 00:14
warning: rpmts_HdrFromFdno: Header V3 RSA/SHA256 Signature, key ID 0608b895: NOKEY
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
Importing GPG key 0x0608B895:
Userid : EPEL (6) <epel@fedoraproject.org>
Package: epel-release-6-8.noarch (@extras)
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
Is this ok [y/N]: y
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : 1:libuv-0.10.34-1.el6.x86_64 1/2
Installing : nodejs-0.10.42-4.el6.x86_64 2/2
Verifying : nodejs-0.10.42-4.el6.x86_64 1/2
Verifying : 1:libuv-0.10.34-1.el6.x86_64 2/2
Installed:
nodejs.x86_64 0:0.10.42-4.el6
Dependency Installed:
libuv.x86_64 1:0.10.34-1.el6
Complete!
[root@h202 blog]#再次尝试 启动服务
代码语言：javascript复制[root@h202 blog]# rails server
=> Booting WEBrick
=> Rails 4.2.6 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
[2016-04-22 13:28:17] INFO WEBrick 1.3.1
[2016-04-22 13:28:17] INFO ruby 2.3.0 (2015-12-25) [x86_64-linux]
[2016-04-22 13:28:17] INFO WEBrick::HTTPServer#start: pid=11288 port=3000
...
...
...
