Homebrew is a package manager for Mac, similar to yum or apt-get in Linux system, it can make your Mac more perfect. mongodb is a NOSQL database, a document database, which is different from traditional relational databases (mysql, orcal, etc.). This article gives a basic introduction to brew and installs mongoddb on Mac using brew and its problems and precautions ( Note from the author)

There are more tasks that need to be completed in recent work , So the previous series of blogs (a series of articles based on gulp requirejs rjs’s front-end automation construction) have not been completed. First insert a blog here to record some things. Because we need to build a framework for our existing front-end framework in our work recently. A backend system with output is used to complete front-end construction and output projects. So I am going to use node + express for project evaluation and mongodb for persistence. This article records the use of brew to install mongodb under Mac.

Homebrew

Homebrew is a software package management tool for Mac, we can use it to install and uninstall software on our Mac Software etc. If you use Homebrew, we must first install Homebrew under our Mac, execute the following command to install:

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/ install/master< /span>/install)" 

Homebrew The installation is very simple, use a ruby ​​command, our Mac computer comes with ruby, you can try it in the terminal:

ruby -v

As follows, output ruby ​​version:

< /p >

Execute the installation command, install brew, after the installation is complete, we will You can use brew to install the software on the Mac. Before installing mongodb, let’s learn about brew. First, how to uninstall brew? If you don’t know how to uninstall, you can execute the brew installation command again, if you have already installed it. If brew executes the installation command again, it will give you a prompt telling you that brew has been installed on your system. If you want to repeat the installation, execute the uninstall command. In this way, you can execute the following uninstall command according to the terminal prompt. I also posted the uninstall command of brew:

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)" 

In fact, it is ok to change the install command in the installation command to uninstall NS.

Here are some common brew commands:< /p>

1. Follow the new brew itself

2. Use brew to install the software

brew install soft_name
// soft_name is the sign of the software you want to install, such as using brew to install git
brew install git

3. Use brew to uninstall the software

brew uninstall soft_name
// soft_name is the sign of the software you want to uninstall, such as using brew to uninstall git
brew uninstal l git

4, display use List of software installed by brew

brew list

5. Update software

brew upgrade // Update all software installed with brew
brew upgrade git // Update a software installed with brew

6. Check which software needs to be updated

brew  outdated

7. Find software< /p>

// When you can’t remember the name of the software, you can use search, just write a few words A letter, he will help you associate and output all possible results to you 
brew search

The following figure shows the output result of using brew search gi:

8. Check what is installed with brew and where it is installed

brew --cache

More commands

Use brew to install mongodb

1. With brew, we can install mongodb very easily:

brew install mongodb

< p style="line-height:28px;font-size:18px;color:rgb(182,138,0);font-family:Georgia, Helvetica;">2. Afterwards, upgrade our mongodb to ensure the latest version< /p>

brew upgrade mongodb

If you start mongo now, you will not succeed, as follows:

Failed to connect to 127.0.0.1:27017, reason: errno:61 Connection refused

Error: couldn't connect to server 127.0.0.1:27017 (127.0.0.1), connection attempt failed at src/mongo/shell/mongo.js:146

exception: connect failed

3. Before starting mongo, we need to create a directory, which is the default for mongo Write the data into the directory

mkdir -p /data/db 
4. Then give the newly created directory a readable Permission to write
 
chown `id -u` /data/db
5. Modify the directory
// /data/db The directory is the default directory of mongo. If you want to use another directory, you can use the --dbpath parameter
mongo --dbpath dir_name
// dir_name is your directory name
Now, you can start mongodb with confidence, execute The following command:
mongod
If the above error is still included, maybe you can try the following command: 
brew services start mongodb
However, brew services will be abolished and no one has maintained them. Click here for details. 
Now if everything goes well, it should look like this: 

If one day you find that your database suddenly fails to start, it may be caused by a normal shutdown. You can delete mongod. lock the file, then restart, if it still doesn’t work, you can check the process, then Kill:
ps -aef | grep mongo
 < p style="line-height:28px;font-size:18px;color:rgb(182,138,0);font-family:Georgia, Helvetica;">as follows:

Then kill the process according to the process ID:
sudo kill< /span> 6955
Restart the mongodb service, ie Yes:
mongod
We can open a new terminal window to connect to the database and try to view all the databases:
mongo

show dbs

Finally, like everyone recommend a client-side visualization tool robomongodb that connects to mongo. It is a cross-platform tool. We can download the Mac version and open it after installation. The interface looks like this:

click the create button to create a new connection, a connection configuration box will pop up, there are some default parameters, we keep the default, directly click save, and then Just click the connect button:

The following figure is the interface after clicking connect to connect to the database successfully

Well, other authors will continue to play tricks, everyone encourages, and study hard.