MongoDb進階實踐之九 Mongodb的備份與還原

時間 2019-12-01

原文原文鏈接

1、引言

    　　前幾天寫了MongoDB數據庫的聚合。一說到「聚合」，用過關係型數據庫的人都應該知道它是一個什麼東西，主要是用於對數據分類彙總和統計。你們都知道，作爲DBA還有另外一個重要的任務，那就是對數據庫進行備份，以備當數據庫發生損壞的時候，咱們能夠還原到之前的某個時刻，防止數據的丟失。今天我就來拋磚引玉，簡單的說一說MongoDB文檔數據庫中的「備份-還原」的概念。

2、簡介

    　　提及來數據庫的「備份-還原」，在RDBMS系統中，都有很好的支持，也有不少選項能夠設置，功能強大，也能自動完成大部分的備份功能，只要當初設置好了就能夠了。對於MongoDB文檔型的數據庫來講，狀況有一些不同。在MongoDB中，要想對數據進行備份操做，須要使用腳原本執行命令完成，還原的的工做也是同樣的，這是它自己支持的「備份-還原」的工做，相對RDBMS系統來講，要簡單不少，不能自動完成。真的不能進行設置，來自動完成「備份和還原」的操做嗎？固然能夠，只是咱們須要使用第三的軟件才能夠，並且功能越強大的，收費有的就越多，免費的也有，功能通常了，可是完成「備份-還原」的工做沒問題。

          接下來咱們就開始說說MongoDB本身的、原生態的「備份-還原」是如何實現的，腳本很簡單。mongodump命名主要完成數據的備份工做，mongorestore命令主要完成數據庫的還原操做。就這兩個命名，是否是很簡單，那就開始咱們今天的正文吧。

3、數據庫的備份和還原

    一、MongoDB數據庫的備份

        1.一、mongodump命令腳本語法以下：

       >./mongodump -h dbhost -d dbname -o dbdirectory

           -h：--host【--host <hostname><:port>, -h <hostname><:port>】

               MongoDB所在服務器地址，默認地址：localhost（127.0.0.1），固然也能夠指定端口號：localhost:27017

           -d：--db【--db <database>, -d <database>】

               須要備份的數據庫實例，例如：school,這個數據庫是我本身創建的，因此是該備份的

           -o：--out <path>【 --out <path>, -o <path>】

               備份的數據存放位置，例如：./databaseBack，固然該目錄須要提早創建，在備份完成後，系統自動在dump目錄下創建一個test目錄，這個目錄裏面存放該數據庫實例的備份數據。

          -u：--username <username>【--username <username>, -u <username>】

               指定用於向使用認證的MongoDB數據庫認證的用戶名，與--password和--authenticationDatabase結合使用

       -p：--password <password>【--password <password>, -p <password>】

               指定用於向使用認證的MongoDB數據庫認證的密碼。與--username和 --authenticationDatabase選項結合使用。

       -c：--collection <collection>【--collection <collection>, -c <collection>】

               指定要備份的集合。若是不指定，則會將指定數據庫或實例中的全部集合備份。

           --port <port>：

               指定MongoDB實例監聽客戶鏈接的TCP端口號。端口的默認值：27017

           --gzip：

                MongoDB3.2或者以上的版本，能夠進行壓縮輸出，若是mongodump指定導出到目錄，則該選項會將每一個文件都壓縮，並添加.gz後綴；若是mongodump指定導出到文檔或標準輸出流，則該選項會壓縮到文檔或輸出流中

           --authenticationDatabase：【--authenticationDatabase <dbname>】

                 若是您未指定身份驗證數據庫，則mongodump會假定指定要導出的數據庫保存用戶的憑據。若是您未指定要導出的身份驗證數據庫或數據庫，則mongodump假定admin數據庫保存用戶的憑據。

           --authenticationMechanism：【 --authenticationMechanism <name>】

                默認值： SCRAM-SHA-1

        1.二、實例代碼

       　　1】、登錄MongoDB的客戶端，查看school數據庫當前的詳情linux

            //登錄MongoDB的客戶端
            [root@linux bin]# ./mongo --host=192.168.127.130 --port=27017
            MongoDB shell version v3.6.3
            connecting to: mongodb://192.168.127.130:27017/
            MongoDB server version: 3.6.3
            Server has startup warnings:
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten]
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten]
            2018-06-13T11:27:09.723+0800 I CONTROL  [initandlisten]
            2018-06-13T11:27:09.723+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
            2018-06-13T11:27:09.723+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
            2018-06-13T11:27:09.723+0800 I CONTROL  [initandlisten]


            //顯示當前數據庫列表
            > show dbs
            admin   0.000GB
            config  0.000GB
            local   0.000GB
            school  0.000GB   //---這個數據庫就是咱們要備份的

            //切換到school數據庫
            > use school
            switched to db school

            //顯示當前school數據庫下有多個集合
            > show tables
            geoInstance
            users

            //當前兩個集合都有數據
            > db.users.find()
            { "_id" : ObjectId("5b1e044733091e826f7c2c74"), "title" : "MongoDb Overview", "description" : "Mongodb is not sql database", "author" : "huangFeiHong", "url" : "http://www.huangfeihong.com", "tags" : [ "mongodb", "database", "NoSql" ], "likes" : 100, "quantity" : 4 }
            { "_id" : ObjectId("5b1e044733091e826f7c2c75"), "title" : "NoSql Overview", "description" : "No sql database is very fast", "author" : "huangFeiHong", "url" : "http://www.huangfeihong.com", "tags" : [ "mongodb", "database", "NoSql" ], "likes" : 10, "quantity" : 12 }
            { "_id" : ObjectId("5b1e044733091e826f7c2c76"), "title" : "Log4Net Overview", "description" : "log4net is not sql database", "author" : "linChong", "url" : "http://www.linchong.com", "tags" : [ "log", "net", "NoSQL" ], "likes" : 750, "quantity" : 6 }
            { "_id" : ObjectId("5b1e1bfb33091e826f7c2c77"), "title" : "MongoDb Higher", "description" : "Mongodb is not sql database", "author" : "huangFeiHong", "url" : "http://www.huangfeihong.com", "tags" : [ "mongodb", "database", "NoSql" ], "likes" : 120, "quantity" : 4 }
            { "_id" : ObjectId("5b1e1bfb33091e826f7c2c78"), "title" : "NoSql Redis Overview", "description" : "No sql database is very fast", "author" : "linChong", "url" : "http://www.linchong.com", "tags" : [ "redis", "database", "NoSql" ], "likes" : 30, "quantity" : 33 }
            { "_id" : ObjectId("5b1e1bfb33091e826f7c2c79"), "title" : "Memcached Overrivew", "description" : "Memcached is sql database", "author" : "wuSong", "url" : "http://www.wusong.com", "tags" : [ "memcached", "cache", "NoSQL" ], "likes" : 50, "quantity" : 10 }
            >
            >
            > db.geoInstance.find()
            { "_id" : ObjectId("5b1f4d21cf30d7cba03d5e03"), "loc" : [ 1, 3 ] }
            { "_id" : ObjectId("5b1f4d21cf30d7cba03d5e04"), "loc" : [ 3, 4 ] }
            { "_id" : ObjectId("5b1f4d21cf30d7cba03d5e05"), "loc" : [ 0, -3 ] }
            { "_id" : ObjectId("5b1f4d21cf30d7cba03d5e06"), "loc" : [ -6, 2 ] }
            { "_id" : ObjectId("5b1f4d21cf30d7cba03d5e07"), "loc" : { "x" : 9, "y" : 5 } }
            { "_id" : ObjectId("5b1f4d21cf30d7cba03d5e08"), "loc" : { "lng" : -9.2, "lat" : 21.3 } }

　　2】、退出MongoDB的客戶端，咱們要建立保存備份文件的目錄
redis

            //退出MongoDB的客戶端
            > exit
            bye
            [root@linux bin]#

            //當前目錄結構
            [root@linux bin]# pwd
            /root/application/program/mongodb/mongodb-linux-x86_64-3.6.3/bin
            [root@linux bin]# databaseBack    //建立保存備份文件的目錄名稱

            
            //已經建立好的目錄結構，databaseBack是備份目錄
            [root@linux bin]# ls
            bsondump      datas            logs   mongod        mongodump    mongofiles   mongoperf    mongorestore  mongostat
            databaseBack  install_compass  mongo  mongodb.conf  mongoexport  mongoimport  mongoreplay  mongos        mongotop

　　3】、開始備份數據庫，由於咱們使用的是客戶端，要寫完整的地址，在MongoDB服務器端就能夠省略sql

            //代碼很簡單
            [root@linux bin]# ./mongodump -h 192.168.127.130:27017 -d school -o ./databaseBack
            2018-06-13T11:50:00.816+0800    writing school.geoInstance to
            2018-06-13T11:50:00.817+0800    writing school.users to
            2018-06-13T11:50:00.821+0800    done dumping school.geoInstance (6 documents)
            2018-06-13T11:50:00.821+0800    done dumping school.users (6 documents)


            //查看備份文件
            [root@linux bin]# ls ./databaseBack
            school
            [root@linux bin]# ls ./databaseBack/school
            geoInstance.bson  geoInstance.metadata.json  users.bson  users.metadata.json

　　4】、如下操做將建立一個只包含名爲school的數據庫中名爲users的集合的轉儲文件。在這種狀況下，數據庫在端口27017上的192.168.127.130運行：

mongodb

            [root@linux bin]# ./mongodump -h 192.168.127.130:27017 --db school --collection users -o ./backCollection
            2018-06-13T13:40:46.702+0800    writing school.users to
            2018-06-13T13:40:46.706+0800    done dumping school.users (6 documents)
            [root@linux bin]# ls ./backCollection
            school
            [root@linux bin]# ls ./backCollection/school
            users.bson  users.metadata.json
            [root@linux bin]#

　　5】、要將轉儲輸出到存檔文件，請使用--archive選項和存檔文件名運行mongodump。例如，如下操做將建立一個包含school數據庫轉儲的文件school.20180613.archive。shell

            [root@linux bin]# ./mongodump -h 192.168.127.130:27017 --archive=./backArchiveFile/school.2018613.archive --db school
            2018-06-13T13:57:51.953+0800    writing school.geoInstance to archive './backArchiveFile/school.2018613.archive'
            2018-06-13T13:57:51.955+0800    writing school.users to archive './backArchiveFile/school.2018613.archive'
            2018-06-13T13:57:51.994+0800    done dumping school.geoInstance (6 documents)
            2018-06-13T13:57:51.997+0800    done dumping school.users (6 documents)
            [root@linux bin]# ls ./backArchiveFile/
            school.2018613.archive

　　6】、要壓縮輸出轉儲目錄中的文件，請使用新的--gzip選項運行mongodump。例如，如下操做將壓縮文件輸出到默認轉儲目錄。數據庫

            [root@linux bin]# ./mongodump -h 192.168.127.130:27017 --db school --gzip -o ./backZip
            2018-06-13T14:04:39.674+0800    writing school.geoInstance to
            2018-06-13T14:04:39.675+0800    writing school.users to
            2018-06-13T14:04:39.682+0800    done dumping school.geoInstance (6 documents)
            2018-06-13T14:04:39.684+0800    done dumping school.users (6 documents)
        
            //顯示壓縮文件
            [root@linux bin]# ls ./backZip/school
            geoInstance.bson.gz  geoInstance.metadata.json.gz  users.bson.gz  users.metadata.json.gz

　　 7】、想要經過mongodump命令將壓縮的文件輸出到指定目錄，請將--gzip選項與--archive選項一塊兒使用，並指定壓縮文件的名稱。json

            [root@linux bin]# ./mongodump -h 192.168.127.130:27017 --archive=./backZip/school.2018613.gz --db school --gzip
            2018-06-13T14:08:57.311+0800    writing school.geoInstance to archive './backZip/school.2018613.gz'
            2018-06-13T14:08:57.312+0800    writing school.users to archive './backZip/school.2018613.gz'
            2018-06-13T14:08:57.346+0800    done dumping school.geoInstance (6 documents)
            2018-06-13T14:08:57.349+0800    done dumping school.users (6 documents)

            [root@linux bin]# ls ./backZip/
            school.2018613.gz

    二、MongoDB數據庫的還原

        　　2.一、mongorestore命令腳本語法以下：

       　　   >mongorestore -h <hostname><:port> -d dbname <path>

                  --host <:port>, -h <:port>：

                  MongoDB所在服務器地址，默認爲： localhost:27017

                  --db , -d ：

                  須要恢復的數據庫實例，例如：school，固然這個名稱也能夠和備份時候的不同，好比school3

                  --drop：

                  還原的時候，先刪除當前的數據，而後還原備份的數據。也就是說，還原後，成功備份以後再添加或者修改的數據都會被刪除，慎用哦！

                  <path>：

                  mongorestore 最後的一個參數，設置備份數據所在位置，如:./databaseBack

                  你不能同時指定 <path> 和 --dir 選項，--dir也能夠設置備份目錄。

                  --dir：

                  指定備份數據的目錄地址

                  你不能同時指定 <path> 和 --dir 選項。

        2.二、示例代碼

       　　1】、上文已經成功備份了數據庫，如今咱們要登錄MongoDB客戶端把咱們的school數據庫刪除。服務器

            //登錄MongoDB客戶端，顯示當前數據庫列表
            [root@linux bin]# ./mongo --host=192.168.127.130 --port=27017
            MongoDB shell version v3.6.3
            connecting to: mongodb://192.168.127.130:27017/
            MongoDB server version: 3.6.3
            Server has startup warnings:
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten]
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten]
            2018-06-13T11:27:09.723+0800 I CONTROL  [initandlisten]
            2018-06-13T11:27:09.723+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
            2018-06-13T11:27:09.723+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
            2018-06-13T11:27:09.723+0800 I CONTROL  [initandlisten]
            > show dbs
            admin   0.000GB
            config  0.000GB
            local   0.000GB
            school  0.000GB
            >

            //刪除school數據庫
            > use school
            switched to db school
            > db.dropDatabase()
            { "dropped" : "school", "ok" : 1 }
            >
            >
            > show dbs
            admin   0.000GB
            config  0.000GB
            local   0.000GB
            >

            //退出MongoDB客戶端
            > exit
            bye
            [root@linux bin]#

　　 2】、咱們開始還原咱們的school數據庫吧，咱們從集合來恢復數據庫。app

            //還原users集合
            [root@linux bin]# ./mongorestore -h 192.168.127.130:27017 --collection users --db school ./databaseBack/school/users.bson
            2018-06-13T13:16:52.118+0800    checking for collection data in databaseBack/school/users.bson
            2018-06-13T13:16:52.120+0800    reading metadata for school.users from databaseBack/school/users.metadata.json
            2018-06-13T13:16:52.148+0800    restoring school.users from databaseBack/school/users.bson
            2018-06-13T13:16:52.218+0800    no indexes to restore
            2018-06-13T13:16:52.218+0800    finished restoring school.users (6 documents)
            2018-06-13T13:16:52.219+0800    done


            //還原geoInstance集合
            [root@linux bin]# ./mongorestore -h 192.168.127.130:27017 --collection geoInstance --db school ./databaseBack/school/geoInstance.bson
            2018-06-13T13:18:26.353+0800    checking for collection data in databaseBack/school/geoInstance.bson
            2018-06-13T13:18:26.358+0800    reading metadata for school.geoInstance from databaseBack/school/geoInstance.metadata.json
            2018-06-13T13:18:26.386+0800    restoring school.geoInstance from databaseBack/school/geoInstance.bson
            2018-06-13T13:18:26.456+0800    restoring indexes for collection school.geoInstance from metadata
            2018-06-13T13:18:26.475+0800    finished restoring school.geoInstance (6 documents)
            2018-06-13T13:18:26.475+0800    done

　　3】、查看一下咱們還原的數據。 memcached

            [root@linux bin]# ./mongo --host=192.168.127.130 --port=27017
            MongoDB shell version v3.6.3
            connecting to: mongodb://192.168.127.130:27017/
            MongoDB server version: 3.6.3
            Server has startup warnings:
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten]
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten]
            2018-06-13T11:27:09.723+0800 I CONTROL  [initandlisten]
            2018-06-13T11:27:09.723+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
            2018-06-13T11:27:09.723+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
            2018-06-13T11:27:09.723+0800 I CONTROL  [initandlisten]
            >
            >
            > show dbs
            admin   0.000GB
            config  0.000GB
            local   0.000GB
            school  0.000GB
            >
            >
            > use school
            switched to db school
            >
            > show tables
            geoInstance
            users
            >
            >
            > db.users.find()
            { "_id" : ObjectId("5b1e044733091e826f7c2c74"), "title" : "MongoDb Overview", "description" : "Mongodb is not sql database", "author" : "huangFeiHong", "url" : "http://www.huangfeihong.com", "tags" : [ "mongodb", "database", "NoSql" ], "likes" : 100, "quantity" : 4 }
            { "_id" : ObjectId("5b1e044733091e826f7c2c75"), "title" : "NoSql Overview", "description" : "No sql database is very fast", "author" : "huangFeiHong", "url" : "http://www.huangfeihong.com", "tags" : [ "mongodb", "database", "NoSql" ], "likes" : 10, "quantity" : 12 }
            { "_id" : ObjectId("5b1e044733091e826f7c2c76"), "title" : "Log4Net Overview", "description" : "log4net is not sql database", "author" : "linChong", "url" : "http://www.linchong.com", "tags" : [ "log", "net", "NoSQL" ], "likes" : 750, "quantity" : 6 }
            { "_id" : ObjectId("5b1e1bfb33091e826f7c2c77"), "title" : "MongoDb Higher", "description" : "Mongodb is not sql database", "author" : "huangFeiHong", "url" : "http://www.huangfeihong.com", "tags" : [ "mongodb", "database", "NoSql" ], "likes" : 120, "quantity" : 4 }
            { "_id" : ObjectId("5b1e1bfb33091e826f7c2c78"), "title" : "NoSql Redis Overview", "description" : "No sql database is very fast", "author" : "linChong", "url" : "http://www.linchong.com", "tags" : [ "redis", "database", "NoSql" ], "likes" : 30, "quantity" : 33 }
            { "_id" : ObjectId("5b1e1bfb33091e826f7c2c79"), "title" : "Memcached Overrivew", "description" : "Memcached is sql database", "author" : "wuSong", "url" : "http://www.wusong.com", "tags" : [ "memcached", "cache", "NoSQL" ], "likes" : 50, "quantity" : 10 }
            >
            >
            > db.geoInstance.find()
            { "_id" : ObjectId("5b1f4d21cf30d7cba03d5e03"), "loc" : [ 1, 3 ] }
            { "_id" : ObjectId("5b1f4d21cf30d7cba03d5e04"), "loc" : [ 3, 4 ] }
            { "_id" : ObjectId("5b1f4d21cf30d7cba03d5e05"), "loc" : [ 0, -3 ] }
            { "_id" : ObjectId("5b1f4d21cf30d7cba03d5e06"), "loc" : [ -6, 2 ] }
            { "_id" : ObjectId("5b1f4d21cf30d7cba03d5e07"), "loc" : { "x" : 9, "y" : 5 } }
            { "_id" : ObjectId("5b1f4d21cf30d7cba03d5e08"), "loc" : { "lng" : -9.2, "lat" : 21.3 } }

　　4】、咱們可使用nsInclude參數來恢復指定集合的數據。

            [root@linux bin]# ./mongorestore -h 192.168.127.130:27017 --nsInclude school.users ./databaseBack/
            2018-06-13T14:19:59.942+0800    preparing collections to restore from
            2018-06-13T14:19:59.946+0800    reading metadata for school.users from databaseBack/school/users.metadata.json
            2018-06-13T14:19:59.970+0800    restoring school.users from databaseBack/school/users.bson
            2018-06-13T14:19:59.977+0800    no indexes to restore
            2018-06-13T14:19:59.977+0800    finished restoring school.users (6 documents)
            2018-06-13T14:19:59.977+0800    done


            //這是在有數據的狀況下執行恢復
            [root@linux bin]# ./mongorestore -h 192.168.127.130:27017 --nsInclude school.users ./databaseBack/
            2018-06-13T14:21:10.743+0800    preparing collections to restore from
            2018-06-13T14:21:10.747+0800    reading metadata for school.users from databaseBack/school/users.metadata.json
            2018-06-13T14:21:10.748+0800    restoring school.users from databaseBack/school/users.bson
            2018-06-13T14:21:10.755+0800    error: multiple errors in bulk operation:
              - E11000 duplicate key error collection: school.users index: _id_ dup key: { : ObjectId('5b1e044733091e826f7c2c74') }
              - E11000 duplicate key error collection: school.users index: _id_ dup key: { : ObjectId('5b1e044733091e826f7c2c75') }
              - E11000 duplicate key error collection: school.users index: _id_ dup key: { : ObjectId('5b1e044733091e826f7c2c76') }
              - E11000 duplicate key error collection: school.users index: _id_ dup key: { : ObjectId('5b1e1bfb33091e826f7c2c77') }
              - E11000 duplicate key error collection: school.users index: _id_ dup key: { : ObjectId('5b1e1bfb33091e826f7c2c78') }
              - E11000 duplicate key error collection: school.users index: _id_ dup key: { : ObjectId('5b1e1bfb33091e826f7c2c79') }

            2018-06-13T14:21:10.755+0800    no indexes to restore
            2018-06-13T14:21:10.755+0800    finished restoring school.users (6 documents)
            2018-06-13T14:21:10.755+0800    done

　　5】、咱們可使用zip壓縮文件，經過archive參數來恢復指定數據庫的數據。

            [root@linux bin]# ./mongorestore -h 192.168.127.130:27017 --gzip --db school  --archive=./backZip/school.2018613.gz
            2018-06-13T14:26:48.939+0800    the --db and --collection args should only be used when restoring from a BSON file. Other uses are             deprecated and will not exist in the future; use --nsInclude instead
            2018-06-13T14:26:49.591+0800    preparing collections to restore from
            2018-06-13T14:26:50.041+0800    reading metadata for school.geoInstance from archive './backZip/school.2018613.gz'
            2018-06-13T14:26:50.071+0800    restoring school.geoInstance from archive './backZip/school.2018613.gz'
            2018-06-13T14:26:51.132+0800    restoring indexes for collection school.geoInstance from metadata
            2018-06-13T14:26:51.150+0800    finished restoring school.geoInstance (6 documents)
            2018-06-13T14:26:51.152+0800    reading metadata for school.users from archive './backZip/school.2018613.gz'
            2018-06-13T14:26:51.181+0800    restoring school.users from archive './backZip/school.2018613.gz'
            2018-06-13T14:26:51.837+0800    no indexes to restore
            2018-06-13T14:26:51.838+0800    finished restoring school.users (6 documents)
            2018-06-13T14:26:51.838+0800    done



            //之前已經刪除了school數據庫
            [root@linux bin]# ./mongo --host 192.168.127.130 --port=27017
            MongoDB shell version v3.6.3
            connecting to: mongodb://192.168.127.130:27017/
            MongoDB server version: 3.6.3
            Server has startup warnings:
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten]
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
            2018-06-13T11:27:09.721+0800 I CONTROL  [initandlisten]
            2018-06-13T11:27:09.723+0800 I CONTROL  [initandlisten]
            2018-06-13T11:27:09.723+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
            2018-06-13T11:27:09.723+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
            2018-06-13T11:27:09.723+0800 I CONTROL  [initandlisten]
            > show dbs
            admin   0.000GB
            config  0.000GB
            local   0.000GB
            school  0.000GB  //數據庫已經存在了，說明恢復成功

5、結束

　　好了，就是這些了。MongoDB的備份和還原仍是有不少內容的，mongodump和mongorestore命令有不少參數能夠去配置，今天只是一個初步認知，若是你們想查看更詳細的內容，能夠查看英文的網站。地址以下：https://docs.mongodb.com/manual/reference/program/mongodump/。不忘初心，繼續努力吧。

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