1.解压版安装
获取安装包：
wget https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel70-3.6.2.tgz
解压：
tar zxvf mongodb-linux-x86_64-rhel70-3.6.2.tgz
[root@localhost mongodb]# ls
mongodb-linux-x86_64-rhel70-3.6.2 mongodb-linux-x86_64-rhel70-3.6.2.tgz
重命名解压的文件夹
[root@localhost mongodb]# mv mongodb-linux-x86_64-rhel70-3.6.2 mongdb
创建在mongodb下创建bin、conf、data、log分别存放可执行文件、配置文件、数据文件和日志文件
[root@localhost mongodb]# mkdir data
[root@localhost mongodb]# mkdir log
[root@localhost mongodb]# mkdir bin
[root@localhost mongodb]# mkdir conf
[root@localhost mongodb]# ls
bin conf data log mongodb mongodb-linux-x86_64-rhel70-3.6.2.tgz
将mongdb/bin目录下的mongod和mongo命令复制到bin目录下
在conf下创建mongod.conf配置文件
bind_ip=0.0.0.0
port = 27017
dbpath = /usr/local/mongodb/data/
logpath = /usr/local/mongodb/log/mongod.log
fork = true
bind_ip:绑定的ip地址
port：mongodb使用的端口
dbpath和logpath分别指数据文件和日志文件
fork：表示后台启动mongo进程
进入bin目录下，启动mongodb
./mongod -f ../conf/mongod.conf
[root@localhost bin]# ./mongod -f ../conf/mongod.conf
about to fork child process, waiting until server is ready for connections.
forked process: 20324
child process started successfully, parent exiting
输出如上所示表示启动成功
进入bin目录，执行mongo连接mongodb数据库
[root@localhost bin]# ./mongo 127.0.0.1:27017
输出如下：
MongoDB shell version v3.6.2
connecting to: mongodb://127.0.0.1:27017/test
MongoDB server version: 3.6.2
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:
2018-01-31T13:36:19.345+0800 I CONTROL [initandlisten]
2018-01-31T13:36:19.345+0800 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database.
2018-01-31T13:36:19.345+0800 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted.
2018-01-31T13:36:19.345+0800 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2018-01-31T13:36:19.345+0800 I CONTROL [initandlisten]
2018-01-31T13:36:19.345+0800 I CONTROL [initandlisten] ** WARNING: This server is bound to localhost.
2018-01-31T13:36:19.345+0800 I CONTROL [initandlisten] ** Remote systems will be unable to connect to this server.
2018-01-31T13:36:19.345+0800 I CONTROL [initandlisten] ** Start the server with --bind_ip <address> to specify which IP
2018-01-31T13:36:19.345+0800 I CONTROL [initandlisten] ** addresses it should serve responses from, or with --bind_ip_all to
2018-01-31T13:36:19.345+0800 I CONTROL [initandlisten] ** bind to all interfaces. If this behavior is desired, start the
2018-01-31T13:36:19.345+0800 I CONTROL [initandlisten] ** server with --bind_ip 127.0.0.1 to disable this warning.
2018-01-31T13:36:19.345+0800 I CONTROL [initandlisten]
2018-01-31T13:36:19.346+0800 I CONTROL [initandlisten]
2018-01-31T13:36:19.346+0800 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2018-01-31T13:36:19.346+0800 I CONTROL [initandlisten] ** We suggest setting it to 'never'
2018-01-31T13:36:19.346+0800 I CONTROL [initandlisten]
2018-01-31T13:36:19.346+0800 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2018-01-31T13:36:19.346+0800 I CONTROL [initandlisten] ** We suggest setting it to 'never'
2018-01-31T13:36:19.346+0800 I CONTROL [initandlisten]
2018-01-31T13:39:20.634+0800 E - [main] Error loading history file: FileOpenFailed: Unable to fopen() file /root/.dbshell: No such file or directory
>
表示连接成功。
警告内容： 网上搜了一下，大概意思是
就是允许hugepage可以动态分配，而不是系统启动时预先分配，看上去对内存消耗很大的服务都不喜欢它。感觉这是一个lazy loading的设计思想。
在/etc/rc.local文件中作为永久关闭
if test -f /sys/kernel/mm/transparent_hugepage/enabled; then
echo never > /sys/kernel/mm/transparent_hugepage/enabled
fi
if test -f /sys/kernel/mm/transparent_hugepage/defrag; then
echo never > /sys/kernel/mm/transparent_hugepage/defrag
fi