Install Yarm-PM2 under Ubuntu

First open the official website of yarm. https://www.yarnpkg.com/zh-Hant/

(1) The official installation method of yarn:

1. Install Yarn through the Debian package and paste the following command

curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb https://dl.yarnpkg.com/debian/ stable main"| sudo tee /etc/apt/sources.list.d/yarn.list

2. Next, you can simply use the following instructions to install:

sudo apt-get update && sudo apt-get install yarn

3. Yarn is installed at this point, but the server is abroad, which may be restricted by the network in later use, so we switch to Ali's server. The effect diagram is as follows:

yarn config set registry https://registry.npm.taobao.org 

(Two) install PM2

1. We execute the following command to perform a global installation of pm2:

 npm install vue-cli pm2 -g

2. After the installation is complete, we run the server.js written in the previous article.

Here to talk about it, once the js running through the node command is closed or unexpectedly ended, we cannot continue to access it. So we need to increase stability through pm2.

 pm2 start server.js

The rendering after successful operation is as follows:

If you are successful here, you don't need to read down. If the installation of pm2 fails, continue to read down.

Before, I kept making errors when configuring the environment on ubuntu14.04, and finally I came up with a set of commands, which can be installed normally. You can test it yourself.

(3) Installation failure resolution#

1. First of all, since the installation failed, you must remove the previous installation. The code is as follows:

sudo apt remove cmdtest
sudo apt remove yarn

1. After the removal is complete, follow the installation tutorial on the official website here, the code is as follows:

curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb https://dl.yarnpkg.com/debian/ stable main"| sudo tee /etc/apt/sources.list.d/yarn.list
sudo apt update
sudo apt install yarn
yarn config set registry https://registry.npm.taobao.org 

1. Don't ask why when you get here, copy and paste and run:

1 apt-get update
2 apt-get install apt-transport-https
3 curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -4 echo "deb https://dl.yarnpkg.com/debian/ stable main"| tee /etc/apt/sources.list.d/yarn.list
5 apt-get update
6 apt-get install yarn
7 npm cache clean --force
8 npm install -g ionic cordova
9 npm install vue-cli pm2 -g

1. If the normal error is resolved.

Finally, record the following commonly used pm commands:

• pm2 restart server //Restart pm2 server
• pm2 stop server //stop pm2 server
• pm2 start xxxx.js //Run the js file
• pm2 logs //View pm2 logs
• pm2 ls //View PM2 running list
• pm2 show server //View server details