Example of how to install and uninstall Node.js normally on Linux

Node.js is an event-driven I/O server-side JavaScript environment based on Google's V8 engine. The V8 engine executes Javascript very quickly and has very good performance. To learn Nodejs, you first need to know how to install the environment. In actual production environments, Node.js is generally deployed in the Linux environment. This article mainly introduces to you how to solve the problem of Linux being unable to install and uninstall Node.js normally. The article introduces it in great detail through sample code. It has certain reference learning value for everyone's study or work. Friends who need it can join us below. Let's study, I hope it can help everyone.

Ever since I bought a VPS, I have never been idle. I always want to make full use of it and stock up on things.

So I decided to install nodejs to build a web server. Now the stable version of nodejs has been updated to 8. a few days. I summarized it a little and wrote it down as a note for reference to friends who have encountered the same pitfalls~

Officially recommended installation method (corresponding version warehouse to install Nodejs)

My operation The system is CentOS6 64Bit. I checked the official Nodejs upgrade documentation (including various supported systems). For my system, I need to execute the following commands respectively:

curl --silent --location https://rpm.nodesource.com/setup_8.x | sudo bash -
sudo yum -y install nodejs

Of course, you may need to pass the following additional commands Install the build tool:

sudo yum install gcc-c++ make
# or: sudo yum groupinstall 'Development Tools'

If you have other systems, you can refer to other contents in the document.

I encountered a pitfall here (there may be fewer such situations, so the specific solution will be discussed at the end of the article later). The first item above should be to silently specify the use of 8.

I have tried it repeatedly, and the command clearly prompts you to execute sudo yum -y install nodejs to install nodejs8.x, but it always installs 6.x. Is it a dependency problem? I couldn't figure out the reason, so I had no choice but to find other installation methods, so I found the second installation method.

Manual installation of Nodejs

Get the latest installation package, and unzip the installation. It may depend on Python 2.7 or above, and I will explain it slowly.

If you only manually install Nodejs8. , you can execute

yum install gcc-c++ openssl-devel
cd /usr/local/src
wget http://nodejs.org/dist/v8.9.4/node-v8.9.4.tar.gz
tar zxvf node-v8.9.4.tar.gz
(cd into extracted folder: ex "cd node-v8.9.4.tar.gz")
./configure
make
make install

to check whether it is 8.x. If it is OK, basically the installation part is done. If it doesn't work, it's too bad. If it has something to do with Python, please check out the Python installation and upgrade guide under Linux (still in draft).

Delete nodejs

Then let’s look at deletion, because you have installed a lower version and need to upgrade, that is to delete the old version first, nodejs should be down Compatible, so I didn’t study it because I was too busy to study it. If you save multiple versions of nodejs, of course, some old functions may be abolished in the new version and cause abnormalities. Although generally speaking, the advantages of upgrading outweigh the disadvantages. However, you still have to consider whether the old project environment needs to be upgraded! If you are someone who has nothing to do, and you must have a reason to convince me, please leave a message below. Almost off topic, the delete command is so easy.

node -v

Then enter y as prompted and press Enter to delete it quickly. All deletions are exciting. . .

Actually, the installation process was far from easy for me, otherwise I wouldn’t have been struggling for a few days. One was a version error, and the other was a Python upgrade. There was a version problem. After a lot of data was missing, I found out that it was caused by a yum cache problem.

If you encounter a similar problem to me, please try the following command:

sudo yum remove nodejs

Reference materials

Nodejs official documentation , install Nodejs through package management
How to manually install Nodejs under Centos
The correct Nodejs version cannot be installed under the Yum warehouse (and just now The code in the example is similar, both clear the cache, but it doesn't work for me)
I used the nodejs7.x package to install it under CentOS, but it installed 6.9.5 (an effective solution for me) )
How to delete Nodejs through Linux command

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  ##Summary

So, in fact, it should If you encounter an incorrect version, try clearing the cache, and then install it using the official command~

I think since it is a cache problem in the Yum warehouse, in addition to Nodejs, other packages may also have similar situations. , if you also find that after selecting the required version, the old version is still installed, and it has nothing to do with dependencies, try clearing the cache:)

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