CentOS 7（hhvm只支持64位）下hhvm Nginx环境搭建，，到目前为止CentOS 7下还没有hhvm rpm安装包，因此采用源码编译。在安装hhvm前强力建议先利用《lnmp一键安装包》安装完整的lnmp（包括Nginx、PHP、MySQL）,通过这种方式我们可以在同一台服务器对每个虚拟主机进行配置，如在同一台服务器上有www.111cn.net跑在PHP上、另一个网站blog.linuxeye.com可以选择跑在hhvm，并可以自由切换用php还是hhvm，只需要简单修改虚拟主机配置文件。

安装步骤：
1. 安装完整的LNMP，参考《lnmp一键安装包》

2. 安装hhvm

rpm -Uvh http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-2.noarch.rpm
yum -y install git mariadb-devel curl-devel expat-devel libpng-devel psmisc binutils-devel ＼
boost-devel libmcrypt-devel libmemcached-devel jemalloc-devel libevent-devel sqlite-devel ＼
libxslt-devel libicu-devel tbb-devel libzip-devel bzip2-devel openldap-devel readline-devel ＼
elfutils-libelf-devel libdwarf-devel libcap-devel libyaml-devel libedit-devel lz4-devel ＼
libvpx-devel unixODBC-devel libgmp-devel libpng-devel ImageMagick-devel curl-devel expat-devel
cd lnmp/src
wget https://google-glog.googlecode.com/files/glog-0.3.3.tar.gz
tar xvzf glog-0.3.3.tar.gz
cd glog-0.3.3
./configure
make && make install
cd ..
wget http://www.geocities.jp/kosako3/oniguruma/archive/onig-5.9.5.tar.gz
tar xvzf onig-5.9.5.tar.gz
cd onig-5.9.5
./configure
make && make install
cd ..
git clone https://github.com/facebook/hhvm -b master  hhvm  --recursive
cd hhvm
./configure
## use newer ImageMagick from remi
rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm
## remove the obsolete ImageMagick version
yum -y remove ImageMagick
yum -y install ImageMagick-last* --enablerepo=remi
cmake -D LIBMAGICKWAND_INCLUDE_DIRS="/usr/include/ImageMagick-6" ＼
-D LIBODBC_INCLUDE_DIRS="/usr/lib64" -D LIBODBC_LIBRARIES="/usr/lib64" ＼
-D LIBVPX_INCLUDE_DIRS="/usr/lib64" -D LIBXSLT_INCLUDE_DIR="/usr/lib64" ＼
-D LIBXSLT_LIBRARIES="/usr/lib64/libxslt.so"  -D LIBMAGICKWAND_LIBRARIES="/usr/lib64/libMagickWand-6.Q16.so" ＼
-D LIBMAGICKCORE_LIBRARIES="/usr/lib64/libMagickCore-6.Q16.so" .
make -j2 #利用cpu多核编译加快速度，2代表核数，单核不用加-j2,查看cpu核数：cat /proc/cpuinfo | grep processor | wc -l
注：编译过程非常消耗系统资源，有可能会报内存不够导致编译中断，如下错误：

[ 30%] Building CXX object third-party/thrift/CMakeFiles/hphp_thrift.dir/thrift/lib/cpp/async/TEventTask.cpp.o
c++: internal compiler error: Killed (program cc1plus)
Please submit a full bug report,
with preprocessed source if appropriate
编译通过后，执行如下命令安装：

make install
安装成功后，打印出hhvm版本：

hhvm --version
HipHop VM 3.4.0-dev (rel)
Compiler: heads/master-0-g0b46339509ebd9612623d52c296fdcc8e6f93dff
Repo schema: d8dcfe0a4feda06dea7087bd82b55ef19217b170
Extension API: 20140829
3. 配置hhvm
创建并修改hhvm目录权限

mkdir /etc/hhvm /var/run/hhvm /var/log/hhvm
chown -R www.www /var/run/hhvm /var/log/hhvm
修改/usr/local/nginx/conf/nginx.conf使其中一段成为如下：

        location ~ .*＼.(php|php5)?$  {
                fastcgi_pass   unix:/var/run/hhvm/sock;
                fastcgi_index  index.php;
                fastcgi_param  SCRIPT_FILENAME $document_root$fastcgi_script_name;
                include        fastcgi_params;
                }
service nginx reload
添加hhvm虚拟主机的方法: 请执行vhost_hhvm.sh

cd lnmp
wget http://blog.linuxeye.com/wp-content/uploads/2014/05/vhost_hhvm.sh
chmod +x vhost_hhvm.sh
创建hhvm配置文件/etc/hhvm/config.hdf，保持如下：

ResourceLimit {
  CoreFileSize = 0          # in bytes
  MaxSocket = 10000         # must be not 0, otherwise HHVM will not start
  SocketDefaultTimeout = 5  # in seconds
  MaxRSS = 0
  MaxRSSPollingCycle = 0    # in seconds, how often to check max memory
  DropCacheCycle = 0        # in seconds, how often to drop disk cache
}

Log {
  Level = Info
  AlwaysLogUnhandledExceptions = true
  RuntimeErrorReportingLevel = 8191
  UseLogFile = true
  UseSyslog = false
  File = /var/log/hhvm/error.log
  Access {
    * {
      File = /var/log/hhvm/access.log
      Format = %h %l %u % t ＼"%r＼" %>s %b
    }
  }
}

MySQL {
  ReadOnly = false
  ConnectTimeout = 1000      # in ms
  ReadTimeout = 1000         # in ms
  SlowQueryThreshold = 1000  # in ms, log slow queries as errors
  KillOnTimeout = false
}

Mail {
  SendmailPath = /usr/sbin/sendmail -t -i
  ForceExtraParameters =
}
配置hhvm修改/etc/hhvm/server.ini，保持如下：

; php options
pid = /var/run/hhvm/pid

; hhvm specific
;hhvm.server.port = 9001
hhvm.server.file_socket = /var/run/hhvm/sock
hhvm.server.type = fastcgi
hhvm.server.default_document = index.php
hhvm.log.use_log_file = true
hhvm.log.file = /var/log/hhvm/error.log
hhvm.repo.central.path = /var/run/hhvm/hhvm.hhbc
修改/etc/hhvm/php.ini指定mysql.sock路径（hhvm默认路径sock路径是/var/lib/mysql/mysql.sock）

hhvm.mysql.socket = /tmp/mysql.sock
expose_php = 0 ;关闭头信息X-Powered-By (和hhvm.server.expose_hphp = false作用一样)
memory_limit = 400M
post_max_size = 50M 
添加开机自启动脚本
保证文件/etc/systemd/system/hhvm.service内容如下：

[Unit]
Description=HHVM HipHop Virtual Machine (FCGI)

[Service]
ExecStart=/usr/local/bin/hhvm --mode daemon --user www --config /etc/hhvm/server.ini ＼
--config /etc/hhvm/php.ini --config /etc/hhvm/config.hdf

[Install]
WantedBy=multi-user.target
管理hhvm服务

systemctl enable hhvm #开机自启动
systemctl start hhvm #启动hhvm
systemctl status hhvm #查看hhvm状态