MongoDB is still hand-in-hand when deployed on Linux

To tell the truth, this is do not want to write this kind of foundation, but when I configure the online tutorial although a lot, but most are lack of arms and legs, or not detailed description, here I will press my deployment experience, hand in hand to teach again

If there is any missing or unclear description, please contact me. I will either not write this basic article, since I have written it, it will be updated continuously, just like the previous basic article to build the Go development environment in VsCode, teach you how to configure

This article is based on MongoDB4.0, CentOS environment setup deployment

This is a problem solving, no nonsense, follow the steps, we can deploy without thinking about anything

Deployment began

The Linux server deployed by some companies cannot connect to the Internet. In this case, upload the compressed package to the Linux server in FTP mode and decompress the package

Tar -xvzf mongodb-linux-x86_64-3.2.10. TGZ // Decompress // The ROOT permission is required. Mv mongodb-linux-x86_64-3.2.10 /usr/local/mongodb // Move the decompressed file to the specified directory and rename itcd /usr/local/mongoDB/ // Switch to the migrated mongoDB directoryCopy the code

If you can connect to the Internet, MongoDB’s official website is quite good. After all, I have not done the Internet download, SO I will not write

Okay, so let’s move on to what we did after we unzipped

Create data directory

cd /usr/localMkdir data/db // Create a db directory for storing database data mkdirlog/ / createlogLog directory for storing log dataCopy the code

Config File Configuration

Start by creating our configuration file

cd /usr/localVim conf/ mongodb. conf/ / Create and open the conf fileCopy the code

Then fill out our Conifg file configuration

# mongodb config file

port=27888  # port192.168.105.142 bind_ip = 127.0.0.1# enable extranet access 0.0.0.0
dbpath=/usr/local/mongoDB/data/db  # database storage
logpath=/usr/local/mongoDB/log/mongodb.log Log file storage
fork=true # Set up background run
# auth=true
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Note auth=true first, because the newly deployed MongoDB has not created users. If this function is enabled directly, MongoDB cannot be started

Therefore, if you want to set access to MongoDB, after setting the account password, uncomment auth=true and restart MongoDB

Profile configuration

Configuration of the system profile, which is a necessary step for each software installation, add environment variables to the end of the profile

vim /etc/profile  
  
export MONGODB_HOME=/usr/local/mongodb  
export PATH=$PATH:$MONGODB_HOME/bin  
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If you don’t like vim for text addition, you can also use Echo to append the end of the file’s content

echo 'export MONGODB_HOME=/usr/local/mongodb' >> /etc/profile

echo 'export PATH=$PATH:$MONGODB_HOME/bin' >> /etc/profile
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You can perform either of the preceding operations. However, you need to restart the system configuration for both operations to take effect

source /etc/profile
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At this point, MongoDB has been installed and configured. Now we need to start MongoDB

Start the mongo

Since the startup parameters are configured in config, we directly start the startup in config form

mongod --config .. /conf/mongodb.confCopy the code

Create users and assign permissions

Here I suggest using Studio 3T to connect to our MongoDB server to create users, for no other reason than simplicity

How do we set user permissions in Studio 3T

Select the library to which you want to set permissions and add users

Assign permissions to users

For non-admin libraries, users generally only need to assign readWrite permission

For the admin library, we need to keep an administrator account and assign root permission in case of need. However, in normal operations, do not use the root user if possible. It is easy to perform some dangerous operations and may cause some files that can only be operated by the root user. In other words, it affects the stability of the database

Create user admin admin admin admin admin admin admin admin admin admin admin admin admin admin admin admin admin admin admin admin admin admin adminanydatabase

db.createUser(
{
	user: "naonao".pwd: "123456",
	roles:[
            {role:"root",db:"admin"}
           ,{role:"userAdminAnyDatabase",db:"admin"}]})Copy the code

As you can see, there is a Json array inside roles, so if we only need one permission, keep the elements in the ROLES array just one

Log in to mongoDB using the specified account password and port

Turn off the MongoDB service and remove the user authentication auth=true comment from the configuration file before using user login

Go to the mongoDB/bin file path

cd /usr/mongoDB/bin
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Then use the account password and specify the corresponding port to start MongoDB. If the default port is 27017, do not specify

mongo -u "username" -p "password" -authenticationDatabase "admin" --port 27888
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The default authentication for an account is admin, so if the user belongs to the admin database, it is ok to leave –authenicationDatabase “admin” out

If the username and password used belong to another library, then you must specify the corresponding library. Change ‘admin’ to the corresponding library of the login user

Close the mongo

> use admin
> db.shutdownServer()
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Or simply kill the corresponding Mongo process

Query the MongoDB process first

ps -aux | grep mongo
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KillallMongoDB all associated processes

killall mongo
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Sometimes using kill to specify the corresponding PID of mongo can not end the process, and the mongo process still exists after killall is executed, so we have to use killall-9 mongo

However, killall-9 is a dangerous command. This powerful and dangerous command forces the process to terminate abruptly while running, and the process cannot clean itself up after it finishes. The hazard is that system resources cannot be released normally. It is not recommended unless other methods fail to be used.

Linux opens specified ports

MongoDB has now been built and can be used normally on Linux

If our MongoDB is still insecure about security after adding the account password, we can change our port instead of using the default port 27017

After the port change, we need to remember to open the corresponding port on Linux, otherwise the client will not be able to connect to our MongoDB server

You can enable the port in either of two ways. One is to enable the port after the restart. The other is permanent, and the restart of the server does not affect the opening of the port

Here I set MongoDB’s port to 27888

After Linux restarts, the port needs to be reopened:

iptables -I INPUT -p tcp --dport 27888 -j ACCEPT
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Permanent: add the following command to /etc/sysconfig/iptables

-A INPUT -p tcp -m tcp --dport 27888 -j ACCEPT

# restart iptables
service iptables restart
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If the iptables file doesn’t exist, we’ll just create one

After the server restarts, MongoDB is automatically started

Sometimes we will restart the server, but inevitably something will forget to open, or another colleague restarted the server, he does not know how to open

So we need to configure MongoDB to open automatically so that we can avoid a lot of unnecessary trouble

cd /etc/rc.d

Append MongoDB enable_mode to rc.local
echo '/usr/local/mongoDB/bin/mongod --config /usr/local/mongoDB/conf/mongodb.conf' >> rc.local
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If you have custom ports for MongoDB, don’t forget to configure them to open automatically upon startup

Also write Linux shutdown/restart command here, can verify that we configure the restart effect of the content is successful

Linux shutdown/restart

Restart command: reboot (restart the computer now) shutdown now Shutdown command: shutdown -h nowCopy the code

Most of the time, we connect to Linux servers remotely, so just reboot. Don’t try shutdown. Remote connection of the case, off after you how boot??

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