Node.js Setup

• Advantages
• High productivity by using the same language in both FE and BE
• Easy to implement WebSocket using socket.io
• Node.js uses non-blocking IO model; IO processing in 
• Disadvantages
• Single thread model:
• If one job takes time, it impacts the overall system performance
• Hard to optimize using CPU in multi core system; requires cluster 
• Node.js Install
• sudo dnf install nodejs
• node -v
• update:
• sudo npm cache clean -f
• sudo npm install -g n
• sudo n stable
• sudo n latest
• sudo ln -sf /usr/local/n/versions/node/x.x.x/bin/node /usr/bin/node
• node -v
• sudo dnf install npm
• sudo npm install npm@latest -g
• npm -v
• Express install
• npm init
• npm install express --save
• npm install body-parser --save : to process json, etc
• npm install cookie-parser --save
• npm install multer --save : to process multi-post form
• Swagger
• npm install -g swagger
• cd /usr/local/bin
• ln -s /usr/local/n/versions/node/7.9.0/bin/swagger
• example:
• https://scotch.io/tutorials/speed-up-your-restful-api-development-in-node-js-with-swagger
• file upload:
• http://swagger.io/docs/specification/file-upload/
• 
  
• MongoDB
• dnf install mongod mongodb-server mongo-tools
• systemctl start/enable mongod
• for specific versions:
• vi /etc/yum.repos.d/mongodb.repo

         [mongodb-org-2.6]

         name=MongoDB Repository

         baseurl=http://downloads-distro.mongodb.org/repo/redhat/os/x86_64/

         gpgcheck=0

         enabled=1

    [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

• sudo dnf install mongodb-org mongodb-org-server
• sudo systemctl start/enable mongod
• mongostat or mongostat --rowcount 5 2
• command line: mongo
• config: /etc/mongod.conf
• npm install mongoose --save
• Rock mongo
• sudo yum install httpd gcc php php-gd php-pear php-devel openssl-devel unzip wget
• If you use Fedora 25, you need to downgrade PHP 7.0 to PHP 5.6 before going to the next steps:
  • dnf remove php
  • wget https://rpms.remirepo.net/fedora/remi-release-25.rpm
  • rpm -Uvh remi-release-25.rpm
  • dnf --enablerepo=remi install php56 php56-php-common php56-php-cli php56-php-mbstring php56-php-mcrypt php56-php-pear php56-php-xml php56-runtime php56-php-mysqlnd php56-php-devel php56-php-fpm
  • module load php56
  • systemctl restart httpd
  • cd /etc
  • ln -s /opt/remi/php56/root/etc/php.ini
• sudo pecl install mongo
• sudo vi /etc/php.ini
• extension=mongo.so
• sudo systemctl restart httpd
• php -m | grep -i mongo
• If you use Fedora 25, you need to downgrade PHP 7.0 to PHP 5.6 before going to the next steps:
  • systemctl enable php56-php-fpm
  • systemctl start php56-php-fpm
• wget https://github.com/iwind/rockmongo/archive/master.zip
• unzip master.zip
• sudo mv rockmongo-master/ /var/www/html/rockmongo
• sudo systemctl restart httpd
• Unable to connect MongoDB, please check your configurations. MongoDB said:Failed to connect to: 127.0.0.1:27017: Permission denied.
• /usr/sbin/setsebool -P httpd_can_network_connect 1
• service httpd restart
• PM2
• npm install pm2 -g
• pm2 start app.js
• pm2 monit
• pm2 list
• pm2 stop
• pm2 restart
• pm2 delete
• pm2 logs
• Jade
• http://html2jade.aaron-powell.com/