Shulou(Shulou.com)06/02 Report--

This article introduces the relevant knowledge of "how to install MongoDB on Linux". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Environment:

CentOS 7

MongoDB 3.4.9

Download MongoDB

First, go to the MongoDB official website to download MongoDB, address https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.4.9.tgz. Put the downloaded files in the / opt directory.

Decompression

Extract the downloaded tgz file, rename the folder to mongodb, and then create db and logs directories to store data and logs, respectively. As follows:

Configuration

Go to the bin directory and edit the mongodb.conf file as follows:

Dbpath=/opt/mongodb/dblogpath=/opt/mongodb/logs/mongodb.logport=27017fork=truenohttpinterface=true

The implementation results are as follows:

test

After all this, we can start MongoDB, or in the bin directory, execute the. / mongod-f mongodb.conf command to start MongoDB, and then execute the mongo command to indicate entering the console of MongDB. After entering the console, we enter the db.version () command. If the current MongoDB version number is displayed, the installation is successful. As follows:

By default, the connection address is 127.0.0.1 27017, and the connected database is the test database. We can also specify the connection address and the connected database manually:

Mongo 127.0.0.1:27017/admin

After the connection is successful at this point, enter the db command, and we can see that the currently connected database is admin.

Configure boot boot

We can also configure boot and edit the / etc/rc.d/rc.local file as follows:

Shut down and restart the test automatically after the configuration is completed.

Configure environment variables

You have to enter commands in the installation directory every time. Please configure the environment variables directly and edit the. bash_profile file in the current user directory, as follows:

Turn off the MongoDB service

You can use the db.shutdownServer (); command to shut down the MongoDB service, but this command needs to be executed under the admin database, so switch to admin first, and then shut down the service. The complete running process is as follows:

Safety management

None of the actions we have done above involve users. We all have user names and passwords that need to be logged in when using Oracle, MySQL or MSSQL. Of course, they are also available in MongoDB, but we need to add them manually. Before adding, let's talk about a few features of user management in MongoDB:

The account in 1.MongoDB is set in a certain library, and we have to verify it in which library we set it.

two。 When creating a user, we need to specify the user name, user password, and user role, which represents the user's permissions.

OK, suppose I create a user for the admin database as follows:

Use admindb.createUser ({user: "root", pwd: "123", roles: [{role:" userAdminAnyDatabase ", db:" admin "}]})

User represents the user name, pwd represents the password, role represents the role, and db indicates the database on which the user is applied. The roles of users are as follows:

1.Read: allows the user to read the specified database

2.readWrite: allows users to read and write to a specified database

3.dbAdmin: allows users to perform administrative functions in a specified database, such as index creation, deletion, viewing statistics, or accessing system.profile

4.userAdmin: allows users to write to the system.users collection. You can create, delete and manage users in a specified database.

5.clusterAdmin: available only in the admin database, giving users administrative rights to all shard and replication set related functions

6.readAnyDatabase: available only in admin databases, giving users read access to all databases

7.readWriteAnyDatabase: available only in admin databases, giving users read and write permissions to all databases

8.userAdminAnyDatabase: available only in admin databases, giving users userAdmin permissions for all databases

9.dbAdminAnyDatabase: available only in admin databases, giving users dbAdmin permissions for all databases

10.root: available only in the admin database. Super account, super privilege

After the user has successfully created it, we shut down the current MongoDB service instance, and then restart the new instance as follows:

Mongod-f / opt/mongodb/bin/mongodb.conf-- auth

After a successful startup, if we directly execute the following command, we will prompt that we do not have permissions:

Show dbs

The implementation results are as follows:

"errmsg": "not authorized on admin to execute command {listDatabases: 1.0}", "code": 13, "codeName": "Unauthorized"

At this point, we need to enter the admin database first, and then authorize it, as follows:

Use admindb.auth ("root", "123")

A return of 1 from the execution result of the auth method indicates that the authentication is successful. Then execute the show dbs and you can see the expected results. At this point, I create a read-only user under the sang library, as follows:

Use sangdb.createUser ({user: "readuser", pwd: "123", roles: [{role:" read ", db:" sang "}]})

After the creation is successful, follow the above process to enter the sang library and use the readuser user for authentication. After the authentication is successful, we can perform the query operation in the sang library as follows:

Use sangdb.auth ("readuser", "123")

There will be no problem with performing the query operation after these two steps, but if you do not have permission to perform the insert operation at this time, we can create a user with read and write function to perform the corresponding operation. I will not repeat it here.

That's all for "how to install MongoDB on Linux". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.