最近想尝试一下英特尔的基于WebRTC协同通信开发套件，其中的CS_WebRTC_Conference_Server_MCU依赖MongoDB。
MongoDB是什么？
MongoDB 是一个基于分布式文件存储的数据库。由 C++ 语言编写。旨在为 WEB 应用提供可扩展的高性能数据存储解决方案。
MongoDB 是一个介于关系数据库和非关系数据库之间的产品，是非关系数据库当中功能最丰富，最像关系数据库的。
安装MongoDB
参考：https://docs.mongodb.org/getting-started/shell/tutorial/install-mongodb-on-red-hat/
https://docs.mongodb.org/getting-started/shell/tutorial/install-on-linux/
1、创建repovi /etc/yum.repos.d/mongodb-org-3.2.repo
[mongodb-org-3.2]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.2/x86_64/
gpgcheck=0
enabled=12、安装MongoDB和相关工具
sudo yum install -y mongodb-org
3、启动MongoDB
sudo service mongod start4、验证MongoDB是否启动成功
cat /var/log/mongodb/mongod.log
查看是否有一句：[initandlisten] waiting for connections on port <port>
其中<port>是在/etc/mongod.conf中配置的，默认情况下是27017端口。
还有另一种方式：
# sudo service mongod status
Redirecting to /bin/systemctl status mongod.service
● mongod.service - High-performance, schema-free document-oriented database
Loaded: loaded (/usr/lib/systemd/system/mongod.service; disabled; vendor preset: disabled)
Active: active (running) since 一 2016-09-12 09:50:16 CST; 15s ago
Process: 8787 ExecStart=/usr/bin/mongod $OPTIONS run (code=exited, status=0/SUCCESS)
Main PID: 8842 (mongod)
CGroup: /system.slice/mongod.service
└─8842 /usr/bin/mongod --quiet -f /etc/mongod.conf run
9月 12 09:50:13 192.168.1.155 systemd[1]: Starting High-performance, schema-free document-oriented database...
9月 12 09:50:14 192.168.1.155 mongod[8787]: about to fork child process, waiting until server is ready for connections.
9月 12 09:50:14 192.168.1.155 mongod[8787]: forked process: 8842
9月 12 09:50:16 192.168.1.155 mongod[8787]: child process started successfully, parent exiting
9月 12 09:50:16 192.168.1.155 systemd[1]: Started High-performance, schema-free document-oriented database.没有运行的情况：
# sudo service mongod status
Redirecting to /bin/systemctl status mongod.service
● mongod.service - High-performance, schema-free document-oriented database
Loaded: loaded (/usr/lib/systemd/system/mongod.service; disabled; vendor preset: disabled)
Active: inactive (dead)5、使MongoDB开机自动启动
sudo chkconfig mongod on
6、停止MongoDB
sudo service mongod stop
7、重启MongoDB
sudo service mongod restart
服务器配置: /etc/mongod.conf
# mongo.conf
#where to log
logpath=/var/log/mongo/mongod.log
logappend=true #以追加方式写入日志
# fork and run in background
fork = true
#port = 27017 #端口
dbpath=/var/lib/mongo #数据库文件保存位置
directoryperdb=true
# Enables periodic logging of CPU utilization and I/O wait
#启用定期记录CPU利用率和 I/O 等待
#cpu = true
# Turn on/off security. Off is currently the default
# 是否以安全认证方式运行，默认是不认证的非安全方式
#noauth = true
#auth = true
# Verbose logging output.
# 详细记录输出
#verbose = true
# Inspect all client data for validity on receipt (useful for
# developing drivers)用于开发驱动程序时的检查客户端接收数据的有效性
#objcheck = true
# Enable db quota management 启用数据库配额管理，默认每个db可以有8个文件，可以用quotaFiles参数设置
#quota = true
# 设置oplog记录等级
# Set oplogging level where n is
# 0=off (default)
# 1=W
# 2=R
# 3=both
# 7=W+some reads
#oplog = 0
# Diagnostic/debugging option 动态调试项
#nocursors = true
# Ignore query hints 忽略查询提示
#nohints = true
# 禁用http界面，默认为localhost：28017
# Disable the HTTP interface (Defaults to localhost:27018).这个端口号写的是错的
#nohttpinterface = true
# 关闭服务器端脚本，这将极大的限制功能
# Turns off server-side scripting. This will result in greatly limited
# functionality
#noscripting = true
# 关闭扫描表，任何查询将会是扫描失败
# Turns off table scans. Any query that would do a table scan fails.
#notablescan = true
# 关闭数据文件预分配
# Disable data file preallocation.
#noprealloc = true
# 为新数据库指定.ns文件的大小，单位:MB
# Specify .ns file size for new databases.
# nssize = <size>
# Accout token for Mongo monitoring server.
#mms-token = <token>
# mongo监控服务器的名称
# Server name for Mongo monitoring server.
#mms-name = <server-name>
# mongo监控服务器的ping 间隔
# Ping interval for Mongo monitoring server.
#mms-interval = <seconds>
# Replication Options 复制选项
# in replicated mongo databases, specify here whether this is a slave or master 在复制中，指定当前是从属关系
#slave = true
#source = master.example.com
# Slave only: specify a single database to replicate
#only = master.example.com
# or
#master = true
#source = slave.example.com 进入Mongo命令行
# mongo
MongoDB shell version: 2.6.12
connecting to: test
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
http://docs.mongodb.org/
Questions? Try the support group
http://groups.google.com/group/mongodb-user
Server has startup warnings:
2016-09-12T09:50:14.195+0800 [initandlisten]
2016-09-12T09:50:14.195+0800 [initandlisten] ** WARNING: Readahead for /var/lib/mongodb is set to 4096KB
2016-09-12T09:50:14.195+0800 [initandlisten] ** We suggest setting it to 256KB (512 sectors) or less
2016-09-12T09:50:14.195+0800 [initandlisten] ** http://dochub.mongodb.org/core/readahead
> 小结
通过yum安装是非常简单方便的，不需要纠结依赖项的问题。
更多内容请参考官方文档。