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This document describes the steps to install the traveler application. These steps can be automated in a puppet or docker platform.

Install node.js LTS

Check OS release

cat /etc/os-release

Check if yum is available. Install if not.

which yum

Check available node.js from the default yum repo.

yum list nodejs

Check https://nodejs.org/en/about/releases/ for the current LTS node version.

You will need curl to install.

which curl

E.g. in order to install node v14.

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

Check https://github.com/nodesource/distributions for the current LTS.

After install, verify the node and npm version.

which node
node --version
which npm
npm --version

Install mongodb 3.4

Following https://www.digitalocean.com/community/tutorials/how-to-install-mongodb-on-centos-7 to install on centos 7.

sudo nano /etc/yum.repos.d/mongodb-org.repo

Add the following

[mongodb-org-3.4]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.4/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-3.4.asc

yum repolist
sudo yum install mongodb-org

Check mongod with systemctl after installation.

sudo systemctl stop mongod
sudo systemctl status mongod

Optimize mongodb

See https://docs.mongodb.com/manual/tutorial/transparent-huge-pages/ for how to disable THP.

Install the traveler application and config

Add a traveler user to run the application on the box with node.js.

useradd -m -d /home/traveler traveler
sudo passwd traveler

At /home/traveler,

git clone https://github.com/dongliu/traveler.git

Copy the config directory from the repo root to /home/traveler/traveler-config/. Update the configuration files according to the installation. See the docker directory for example.

Install PM2 and config

As an admin user

sudo npm install pm2@latest -g
which pm2

As the traveler user

pm2 install pm2-logrotate

Start the traveler application with pm2. This requires the application is properly configured.

NODE_ENV=production TRAVELER_CONFIG_REL_PATH=../traveler-config/ pm2 start --name traveler app.js

Save the pm2 script

pm2 save

pm2 files will be created at /home/traveler/.pm2.

As the admin user

sudo env PATH=$PATH:/usr/bin pm2 startup centos -u traveler --hp /home/traveler

Check if traveler script is properly created by

cat /etc/systemd/system/pm2-traveler.service

Reboot the box and the traveler application should start.