How to check the running status of Node.js in CentOS 7

CentOS 7 is a popular version of the Linux operating system commonly used for server running. If you want to run Node.js applications on a CentOS 7 server, you need to make sure Node.js is installed and running correctly. Below are some useful commands for querying Node.js running status on CentOS 7.

Query whether Node.js is installed

On CentOS 7, you can use the following command to query whether Node.js is installed on the system:

node -v

If Node.js is already installed installed on your server, you will see the output version number, for example:

v14.17.6

Otherwise, you will see "bash: node: command not found" or similar error message, which indicates that Node.js Not Installed.

Install Node.js

If Node.js is not installed on CentOS 7, you can use the following command to install it:

Install Node.js v14.x

sudo yum install -y gcc-c++ make
curl -sL https://rpm.nodesource.com/setup_14.x | sudo bash -
sudo yum install -y nodejs

Install Node.js v16.x

sudo yum install -y gcc-c++ make
curl -sL https://rpm.nodesource.com/setup_16.x | sudo bash -
sudo yum install -y nodejs

After the installation is completed, you can execute the "node -v" command again. The output of the version number indicates that the installation is successful.

Query the Node.js runtime version

When you have determined that Node.js has been installed on the CentOS 7 server, you can query which version of Node.js is running:

node -p process.versions.node

The output is similar to:

v14.17.6

Query npm version

npm is the package manager for Node.js. If you want to check the npm version, you can use the following command:

npm -v

The output is similar to:

6.14.15

Conclusion

With the above command, you can easily query and install the complete operation of Node.js and npm on the CentOS 7 server. Keep in mind that version control and management of Node.js are important and can avoid many problems in production environments. Be sure to test new versions carefully before using them in production, and record your version history carefully. Also make sure you have mastered the basics of Node.js and follow best practices.

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