gRPC 是一个高性能、开源和通用的 RPC 框架，面向移动和 HTTP/2 设计。目前提供 C、Java 和 Go 语言版本，分别是：grpc, grpc-java, grpc-go. 其中 C 版本支持 C, C++, Node.js, Python, Ruby, Objective-C, PHP 和 C#。
gRPC 基于 HTTP/2 标准设计，带来诸如双向流、流控、头部压缩、单 TCP 连接上的多复用请求等特。这些特性使得其在移动设备上表现更好，更省电和节省空间占用。
官方网站：http://www.grpc.io/
官方文档：http://www.grpc.io/docs/
中文翻译：http://doc.oschina.net/grpc
测试环境：
系统是新安装的CentOS 7.2
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[ root @ localhost ~ ] # cat /etc/redhat-release
CentOS Linux release 7.2.1511 ( Core )
一、YUM安装相关工具
Shell
yum install - y gcc - c ++ autoconf libtool
yum groupinstall - y "Development Tools"
二、下载gRPC源码和相关子模块
这步可能出现失败或者网速慢的情况（原因你懂的），多执行几次直到完全下载完毕为止。
Shell
git clone https : / / github .com / grpc / grpc .git
cd grpc
git submodule update -- init
三、编译安装protobuf
这个步骤有个地方要下载googlecode的里面的代码，国内正常来说是下载不下来的（除非有梯子），所以要换个下载地址：
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[ root @ localhost grpc ] # cd third_party/protobuf/
[ root @ localhost protobuf ] # vim autogen.sh找到这行：
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xxxxxxxxxx1
curl $curlopts - O https : / / googlemock .googlecode .com / files / gmock - 1.7.0.zip
修改为：
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xxxxxxxxxx1
curl $curlopts - L - o gmock - 1.7.0.zip https : / / github .com / peter - wangxu / gMock / archive / 1.7.0.zip
然后编译安装即可：
Shell
[ root @ localhost protobuf ] # ./autogen
[ root @ localhost protobuf ] # ./configure
[ root @ localhost protobuf ] # make
[ root @ localhost protobuf ] # make install
[ root @ localhost protobuf ] # ldconfig # refresh shared library cache.
[ root @ localhost protobuf ] # which protoc
/ usr / local / bin / protoc
[ root @ localhost protobuf ] # protoc --version
libprotoc 3.0.0
四、编译安装gRPC
oot @ localhost protobuf ] # cd ../..
[ root @ localhost grpc ] # make
[ root @ localhost grpc ] # make install执行make install的时候，我这里有错误提示：
Warning : it looks like protoc 3.0.0 + isn 't installed on your system,
which means that you won' t be able to compile . proto files for use
with gRPC .
If you are just using pre - compiled protocol buffers , or you otherwise
have no need to compile . proto files , you can ignore this .
If you do need protobuf for some reason , you can download and install
it from :
https : //github.com/google/protobuf/releases
Once you' ve done so , you can re - run this check by doing :
make verify - install明明是有安装protoc的，但是没检测到，网上找了资料说这个问题好像是不影响的。
五、Demo测试
官方自带有个HelloWorld的Demo，可以编译这个Demo看是否我们已经安装成功了。
[ root @ localhost grpc ] # cd examples/cpp/helloworld/
[ root @ localhost helloworld ] # make结果报错了：
Package grpc ++ was not found in the pkg - config search path .
Perhaps you should add the directory containing ` grpc ++ . pc '
to the PKG_CONFIG_PATH environment variable
No package ' grpc ++ ' found
Package grpc was not found in the pkg-config search path.
Perhaps you should add the directory containing `grpc.pc'
to the PKG_CONFIG_PATH environment variable意思是找不到环境变量PKG_CONFIG_PATH，解决方法是把环境变量加上去：
在gRPC目录下保存文件actviate.sh：
DIR = "$( cd " $ ( dirname "${BASH_SOURCE[0]}" ) " && pwd )"
export PATH = $ PATH : $ DIR / bins / opt : $ DIR / bins / opt / protobuf
export CPATH = $ DIR / include : $ DIR / third_party / protobuf / src
export LIBRARY_PATH = $ DIR / libs / opt : $ DIR / libs / opt / protobuf
export PKG_CONFIG_PATH = $ DIR / libs / opt / pkgconfig : $ DIR / third_party / protobuf
export LD_LIBRARY_PATH = $ DIR / libs / opt然后执行：
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[ root @ localhost grpc ] # source actviate.sh
[ root @ localhost grpc ] # cd examples/cpp/helloworld/
[ root @ localhost helloworld ] # make编译成功。（注意，每次新开终端编译或运行程序，都要执行actviate.sh，除非把环境变量设成永久有效）
然后运行服务端，监听的是50051端口：
Shell
[ root @ localhost helloworld ] # ./greeter_server
I0719 09 : 09 : 11.798702503 5076 ev_epoll_linux .c : 85 ] epoll engine will be using signal : 36
D0719 09 : 09 : 11.798857929 5076 ev_posix .c : 106 ] Using polling engine : epoll
Server listening on 0.0.0.0 : 50051在另外一个终端执行客户端程序：
[ root @ localhost helloworld ] # ./greeter_client
I0719 09 : 10 : 04.431843293 5142 ev_epoll_linux . c : 85 ] epoll engine will be using signal : 36
D0719 09 : 10 : 04.432006262 5142 ev_posix . c : 106 ] Using polling engine : epoll
Greeter received : Hello world成功！