Installation and configuration tutorial of MongoDB under Linux

MongoDB Installation

Choose to install using Yum

1. Make a repo file

cat << EOF > /etc/yum.repos.d/mongodb-org-4.2.repo
[mongodb-org-4.2]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/7/mongodb-org/4.2/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-4.2.asc
EOF
12345678

baseurl=https://repo.mongodb.org/yum/redhat/8/mongodb-org/4.2/x86_64/ installation failed. Try to set the address to 7 and install a version based on centos7 . Can be successfully installed
baseurl=https://repo.mongodb.org/yum/redhat/7/mongodb-org/4.2/

2. Install using the yum command

yum install -y mongodb-org

3. Start mongodb

After installing and starting the service, you can use

The start, stop, and restart commands are as follows:

service mongod start
service mongod stop
service mongod restart

4. Open remote connection to mongodb

The configuration file of mongodb is /etc/mongod.conf

If you want to open remote access, you need to modify the bindIp value of the file to: 0.0.0.0 , otherwise you will not be able to connect through other computers

vim /etc/mongod.conf

After the file is modified, restart is required to make the configuration take effect.

service mongod restart

If you still cannot connect remotely, check the firewall status. If the firewall is turned on, turn it off or let the firewall open port 27017 (this port is the default port of mongodb , and the port of mongodb can be modified through the configuration file)
Check the firewall status

firewall-cmd --state

Disable firewall status

systemctl stop firewalld.service

Open port 27017 on the firewall

firewall-cmd --permanent --zone=public --add-port=27017/tcp
firewall-cmd --reload

Test whether you can connect remotely

http://serverip:27017/

Alibaba Cloud Server needs to add a security group for the port

5. Create a user and password

1. Enter mongo shell

[root@iZ2ze1wbnx7ym2bkq1xtk5Z conf.d]# mongo
MongoDB shell version v4.2.8
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("73551ca3-8d61-4ce2-a5d1-c0563f9828d4") }
MongoDB server version: 4.2.8
Server has startup warnings:
2020-07-01T15:24:12.665+0800 I CONTROL [initandlisten]
2020-07-01T15:24:12.665+0800 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database.
2020-07-01T15:24:12.665+0800 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted.
2020-07-01T15:24:12.665+0800 I CONTROL [initandlisten]
2020-07-01T15:24:12.665+0800 I CONTROL [initandlisten]
2020-07-01T15:24:12.665+0800 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2020-07-01T15:24:12.665+0800 I CONTROL [initandlisten] ** We suggest setting it to 'never'
2020-07-01T15:24:12.665+0800 I CONTROL [initandlisten]
---
Enable MongoDB's free cloud-based monitoring service, which will then receive and display
metrics about your deployment (disk utilization, CPU, operation statistics, etc).

The monitoring data will be available on a MongoDB website with a unique URL accessible to you
and anyone you share the URL with. MongoDB may use this information to make product
improvements and to suggest MongoDB products and deployment options to you.

To enable free monitoring, run the following command: db.enableFreeMonitoring()
To permanently disable this reminder, run the following command: db.disableFreeMonitoring()
---

>

2. Switch to the admin database

The admin library is automatically included with mongodb and is used to manage users and permissions. Create a super user who can manage the addition, deletion, and permission control of all users.

> use admin
switched to db admin

3. Add an account

Create a user with super administrator privileges ( userAdminAnyDatabase and readWriteAnyDatabase privileges). The username and password can be anything you want, but the role must be these two

db.createUser( 
{ 
user: "alenghan", pwd: "123456", roles: [
{ 
role: "userAdminAnyDatabase", db: "admin" 
},
"readWriteAnyDatabase" 
] 
}
)

Note: Specific usage of ``db.createUser()`: link address

Once created, you can use the command link

mongo --port 27017 -u "alenghan" --authenticationDatabase "admin" -p 123456

4. Modify the mongo.conf file

Stop the mongodb service mongod stop ) and modify the configuration file ( /etc/mongod.conf )

# mongod.conf
# for documentation of all options, see:
# http://docs.mongodb.org/manual/reference/configuration-options/

# where to write logging data.
systemLog: #System log
destination: file #log output destination
logAppend: true # If true, when mongod/mongos is restarted, logs will continue to be added to the end of the existing logs. Otherwise, the current log file will be backed up and a new one will be created; default is false.
path: /var/log/mongodb/mongod.log #Log path

# Where and how to store data.
storage:
dbPath: /var/lib/mongo # The mongod process stores data directory. This configuration is only valid for the mongod process.
Journal:
enabled: true #Whether to enable journal log persistent storage. Journal logs are used for data recovery and are the most basic feature of mongod, usually used for fault recovery. The default value for 64-bit system is true, and the default value for 32-bit system is false. It is recommended to enable this function, which is only valid for the mongod process.
# engine: #Storage engine type. Mongodb 3.0 and later support two engines: "mmapv1" and "wiredTiger". The default value is "mmapv1". The official claims that the wiredTiger engine is better.
# wiredTiger: #Effective for wiredTiger engine configuration

# how the process runs
processManagement:
fork: true # fork and run in background
pidFilePath: /var/run/mongodb/mongod.pid # location of pidfile PID file path
timeZoneInfo: /usr/share/zoneinfo

# network interfaces
net:
port: 27017 #Port
bindIp: 127.0.0.1
# Enter 0.0.0.0,:: to bind to all IPv4 and IPv6 addresses or, alternatively, use the net.bindIpAll setting. Use commas to separate multiple external network ops. If all external network access is allowed, enter 0.0.0.0
# maxIncomingConnections: 65536 #The maximum number of connections allowed by a process is 65536 by default
# wireObjectCheck: true #Check the validity of data when the client writes data (BSON) The default value is true

#security: #Security related configuration
#authorization: enabled #disabled or enabled is only valid for mongod; it indicates whether user access control (Access Control) is enabled, that is, the client can access the system data by username and password authentication. The default is "disabled", that is, the client can access the database data without a password. (Limits authentication between client and mongod and mongos)
#javascriptEnabled: true #true or false, the default is true, which is only valid for mongod; it indicates whether to turn off the javascript function on the server side, that is, whether to allow javascript scripts to be executed on mongod. If it is false, mapreduce, group commands, etc. will not be available because they need to execute javascript script methods on mongod. If your application does not require operations such as MapReduce, you can turn off JavaScript for safety reasons.

#operationProfiling: #Performance Analyzer
#slowOpThresholdMs: 100 #The time threshold that the database profiler uses to determine an operation as a "slow query", in milliseconds;
#mode: off #Database profiler level, the performance information of the operation will be written to the log file,
# Optional value: 1) off: turn off profiling
# 2) slowOp: on, only includes slow operation logs
# 3) all: on, record all operations
# Database profiling will affect performance, so it is recommended to enable it only during performance debugging. This parameter is valid only for mongod.

#replication: #Master-slave replication master-slave mode This is a big point and needs to be discussed separately
#oplogSizeMB:10240 #The maximum size of the replication operation log, unit: MB.

#sharding: #sharding architecture is used in clusters, no contact yet

Summarize

This is the end of this article about the installation and configuration of MongoDB under Linux. For more information about the installation and configuration of MongoDB under Linux, please search for previous articles on 123WORDPRESS.COM or continue to browse the related articles below. I hope you will support 123WORDPRESS.COM in the future!