简介：
Mongodb 是一个由 C++ 语言编写的基于分布式文件存储的数据库，是目前最像关系型数据库的非关系型数据库。
下载地址：https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel62-3.6.3.tgz
一、直接安装吧，CentOS 6.8 x86_64
shell > tar zxf mongodb-linux-x86_64-rhel62-3.6.3.tgz shell > mv mongodb-linux-x86_64-rhel62-3.6.3 /usr/local/mongodb
# 设置环境变量，export PATH=$PATH:/usr/local/mongodb/bin && source /etc/profile
二、启动、客户端连接
shell > mkdir -p /data/{mongo_data,logs}
# 创建一个数据目录跟日志目录
shell > mongod --dbpath /data/mongo_data --logpath /data/logs/mongo.log --fork about to fork child process, waiting until server is ready for connections. forked process: 8659 child process started successfully, parent exiting
# --fork 后台启动 mongod 进程，--dbpath、--logpath 分别指定数据目录跟日志文件
shell > mongo MongoDB shell version v3.6.3 connecting to: mongodb://127.0.0.1:27017 MongoDB server version: 3.6.3 Welcome to the MongoDB shell. For interactive help, type "help".
# 连接本机 mongodb，--bind_ip 指定要监听的地址，--help 查看帮助信息
三、基本操作
> help db.help() help on db methods db.mycoll.help() help on collection methods sh.help() sharding helpers rs.help() replica set helpers help admin administrative help help connect connecting to a db help help keys key shortcuts help misc misc things to know help mr mapreduce show dbs show database names show collections show collections in current database show users show users in current database show profile show most recent system.profile entries with time >= 1ms show logs show the accessible logger names show log [name] prints out the last segment of log in memory, 'global' is default use <db_name> set current database db.foo.find() list objects in collection foo db.foo.find( { a : 1 } ) list objects in foo where a == 1 it result of the last line evaluated; use to further iterate DBQuery.shellBatchSize = x set default number of items to display on shell exit quit the mongo shell
# 输入 help 显示帮助信息
1、数据库、数据表
# 都是不需要事先创建的
> db test > show dbs admin 0.000GB config 0.000GB local 0.000GB
# 默认连接到了 test 库，目前这台 mongo 中有三个数据库：admin、config、local
2、切换数据库，直接插入数据
> use spider_db switched to db spider_db > db spider_db > show dbs admin 0.000GB config 0.000GB local 0.000GB
# 数据库中没有数据，是不会显示的 ( 还没有正式生成数据文件 )
> db.spider_resource.insert({"id": 1, "name": "wang", "age": 28})
WriteResult({ "nInserted" : 1 })
> db.spider_resource.find()
{ "_id" : ObjectId("5ab0ba99090d8464fa486775"), "id" : 1, "name" : "wang", "age" : 28 }
# 成功插入一条数据
> db.spider_resource.update({"name": "wang"}, {$set: {"QQ": "25152069"}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.spider_resource.find({"id": 1})
{ "_id" : ObjectId("5ab0ba99090d8464fa486775"), "id" : 1, "name" : "wang", "age" : 28, "QQ" : "25152069" }
# 更新数据成功
> db.spider_resource.deleteMany({"age": 28})
{ "acknowledged" : true, "deletedCount" : 1 }
# 删除所有 Age = 28 的数据
四、权限验证
# Mongodb 的权限验证跟其余的数据库，例如: MySQL、Redis 等都不同，不是统一权限验证，而是基于数据库的权限验证。
# 例如，当你在 A 库创建用户后，你只能在 A 库验证，即使你创建用户时给该用户分配的数据库不是 A 库。
# MongoDB 内置角色：
>、数据库用户角色：read(对指定数据库只读)、readWrite(对指定数据库读写)
>、数据库管理角色：dbAdmin(对指定数据库执行管理函数)、dbOwner(对指定数据库有所有权)、userAdmin(对指定数据库具有用户管理权限)
>、集群管理角色：clusterAdmin、clusterManager、clusterMonitor、hostManager
# 只允许在 admin 数据库中使用，授予用户对集群的管理权限
>、备份恢复角色：backup、restore
>、所有数据库角色：readAnyDatabase、readWriteAnyDatabase、userAdminAnyDatabase、dbAdminAnyDatabase
# 只允许在 admin 数据库中使用，授予用户对所有数据库相应的权限
>、超级用户角色：root(只允许在 admin 数据库中使用，全局权限最高)
1、创建用户、分配角色
> use admin switched to db admin > db.createUser({user: "dba", pwd: "dba", roles: [{role: "userAdminAnyDatabase", db: "admin"}]}) Successfully added user: { "user" : "dba", "roles" : [ { "role" : "userAdminAnyDatabase", "db" : "admin" } ] }
# 切换到 admin 数据库，创建了一个具有管理所有数据库用户的角色用户
# 执行 db.shutdownServer() 关闭 mongodb 后，以验证方式重新启动。
shell > mongod --dbpath /data/mongo_data --logpath /data/logs/mongo.log --fork --auth about to fork child process, waiting until server is ready for connections. forked process: 15886 child process started successfully, parent exiting
2、用户身份认证、权限验证
> show dbs 2018-03-20T05:15:23.327-0400 E QUERY [thread1] Error: listDatabases failed:{ "ok" : 0, "errmsg" : "not authorized on admin to execute command { listDatabases: 1.0, $db: "admin" }", "code" : 13, "codeName" : "Unauthorized" } : _getErrorWithCode@src/mongo/shell/utils.js:25:13 Mongo.prototype.getDBs@src/mongo/shell/mongo.js:65:1 shellHelper.show@src/mongo/shell/utils.js:816:19 shellHelper@src/mongo/shell/utils.js:706:15 @(shellhelp2):1:1
# 重新连接后，输入 show dbs 报错，提示认证失败
> use admin switched to db admin > db.auth("dba", "dba") 1 > show dbs admin 0.000GB config 0.000GB local 0.000GB
# 用户认证后，再次执行则不报错
> use spider_db switched to db spider_db > db.tmdb.insert({"id": 1, "name": "wang"}) WriteResult({ "writeError" : { "code" : 13, "errmsg" : "not authorized on spider_db to execute command { insert: "tmdb", ordered: true, $db: "spider_db" }" } })
# 切换到 spider_db 数据库，插入数据的时候报错，提示认证失败，先前创建的 userAdminAnyDatabase 角色用户只有用户管理权限
> use admin switched to db admin > db.createUser({user: "user01", pwd: "user01", roles: [{role: "read", db: "spider_db"}]}) Successfully added user: { "user" : "user01", "roles" : [ { "role" : "read", "db" : "spider_db" } ] } > use spider_db switched to db spider_db > db.createUser({user: "user02", pwd: "user02", roles: [{role: "readWrite", db: "spider_db"}]}) Successfully added user: { "user" : "user02", "roles" : [ { "role" : "readWrite", "db" : "spider_db" } ] }
# 我们在 admin 数据库中创建了一个只读用户 user01，在 spider_db 数据库中创建了一个读写用户 user02。
> db.auth("user02", "user02") 1 > db.tmdb.insert({"id": 1, "name": "wang"}) WriteResult({ "nInserted" : 1 }) > db.tmdb.find() { "_id" : ObjectId("5ab0d35d0c6513083da7387c"), "id" : 1, "name" : "wang" } > show collections tmdb > show dbs admin 0.000GB config 0.000GB local 0.000GB spider_db 0.000GB
# 我们在 spider_db 数据库中切换了用户 user02，成功创建了一条记录，也可以读到该记录，并且也显示出了集合(表)、跟数据库
> db.auth("user01", "user01") Error: Authentication failed. 0 > use admin switched to db admin > db.auth("user01", "user01") 1 > use spider_db switched to db spider_db > db.tmdb.find() { "_id" : ObjectId("5ab0d35d0c6513083da7387c"), "id" : 1, "name" : "wang" }
# 我们在 spider_db 数据库中切换用户 user01 时，提示认证失败，当切换到 admin 数据库中再次切换用户时，成功了。
# 这是我用 user01 这个只读用户插入数据居然成功了！！！然后我退出客户端，重新登录认证后，还是用这个 user01 只读用户创建数据提示失败。
> use admin switched to db admin > db.auth("user01", "user01") 1 > use spider_db switched to db spider_db > db.tmdb.find() { "_id" : ObjectId("5ab0d35d0c6513083da7387c"), "id" : 1, "name" : "wang" } { "_id" : ObjectId("5ab0d5300c6513083da7387d"), "id" : 2, "name" : "xiao" } { "_id" : ObjectId("5ab0e1e6e1f734cf6e1f6373"), "id" : 3, "name" : "qiang" } { "_id" : ObjectId("5ab0e259e1f734cf6e1f6374"), "id" : 4, "name" : "king" } > db.tmdb.insert({"id": 5, "name": "baby"}) WriteResult({ "writeError" : { "code" : 13, "errmsg" : "not authorized on spider_db to execute command { insert: "tmdb", ordered: true, $db: "spider_db" }" } })
# 可见，这个切换用户是不是有点问题呢 ？？？
3、查看当前所有用户
> use admin switched to db admin > db.auth("dba", "dba") 1 > db.system.users.find().pretty() { "_id" : "admin.dba", "user" : "dba", "db" : "admin", "credentials" : { "SCRAM-SHA-1" : { "iterationCount" : 10000, "salt" : "xZe7OF09184eRzmIrYah4A==", "storedKey" : "BW+tDxhWucq8OtgsndNIkTIg3go=", "serverKey" : "zWd0pqb1fyRlNdknJlOBjzfgf/k=" } }, "roles" : [ { "role" : "userAdminAnyDatabase", "db" : "admin" } ] } { "_id" : "admin.user01", "user" : "user01", "db" : "admin", "credentials" : { "SCRAM-SHA-1" : { "iterationCount" : 10000, "salt" : "gBT2977goyNF5lYTJrufxw==", "storedKey" : "UuuMWuQUEi5GgxAYHbwAxBDjbGY=", "serverKey" : "Lv79GMQSgNGqRR8R4LNzgCOWcd0=" } }, "roles" : [ { "role" : "read", "db" : "spider_db" } ] } { "_id" : "spider_db.user02", "user" : "user02", "db" : "spider_db", "credentials" : { "SCRAM-SHA-1" : { "iterationCount" : 10000, "salt" : "UxsTe1hRECOvCqL4f4uB8A==", "storedKey" : "kf/SHhtTzSZzQDjHwszrR2wHu/c=", "serverKey" : "rXC9p41rGwyo9QyhkZWY1gTliAc=" } }, "roles" : [ { "role" : "readWrite", "db" : "spider_db" } ] } { "_id" : "spider_db.user03", "user" : "user03", "db" : "spider_db", "credentials" : { "SCRAM-SHA-1" : { "iterationCount" : 10000, "salt" : "Mem9nRSILHK7ZWQBIqP9yA==", "storedKey" : "o8uGPAL4aNIFNT1Y2MWyST8NUe8=", "serverKey" : "TWo+f+QmO0AqGg1L83tku/hpM+Y=" } }, "roles" : [ { "role" : "read", "db" : "spider_db" } ] }
# 对 就是这样
> db.system.users.find().count() 4
# 统计咯