Setting Node.JS on Ubuntu

info.txt

**Install Node.js**

cd ~
curl -sL https://deb.nodesource.com/setup_8.x -o nodesource_setup.sh
sudo bash nodesource_setup.sh
sudo apt-get install nodejs
sudo apt-get install build-essential

**Install Nginx**
sudo apt-get update
sudo apt-get install nginx

**Adjust the Firewall**
sudo ufw app list    -- to list all available apps
Nginx Full: This profile opens both port 80 (normal, unencrypted web traffic) and port 443 (TLS/SSL encrypted traffic)
Nginx HTTP: This profile opens only port 80 (normal, unencrypted web traffic)
Nginx HTTPS: This profile opens only port 443 (TLS/SSL encrypted traffic)
sudo ufw allow 'Nginx Full'

**Manage the Nginx Process**
sudo systemctl stop nginx
sudo systemctl start nginx
sudo systemctl restart nginx
sudo systemctl reload nginx


**Set Up Nginx as a Reverse Proxy Server**
sudo nano /etc/nginx/sites-available/default
. . .
    location / {
        proxy_pass http://localhost:8080;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}

**Check Nginx syntax**
sudo nginx -t
sudo systemctl restart nginx

How to fix connect() to php5-fpm.sock failed (13: Permission denied) while connecting to upstream Nginx error

I encountered this problem after updating PHP to 5.5.12. I use Nginx with PHP5 FPM and after the updating PHP I was seeing 502 Gateway Error pages. Nginx’s error log file (/var/log/nginx/error.log) had the following in it:

2014/05/08 06:22:24 [crit] 24538#0: *292759 connect() to unix:/var/run/php5-fpm.sock failed (13: Permission denied) while connecting to upstream, client: 1.1.1.1, server: websistent.com, request: "GET /wordpress-custom-403-401-error-page/ HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "websistent.com"

The default value of the listen.mode was 0666 prior 5.5.12. To fix the CVE-2014-0185 vulnerability this was changed to 0660. This is evident from the permissions:

$ ls -l /var/run/php5-fpm.sock
srw-rw---- 1 root root 0 May 1 19:40 /var/run/php5-fpm.sock

Notice the first column of the output srw-rw----, it means users/groups other than root do not have any permissions on this file.
We have two options now:

1. Explicitly set the “listen.mode” to 0666 which make it insecure, or
2. Change the owner and group of the socket file so that Nginx can read/write to it.

Option 2 is highly recommended, find out username used by the Nginx worker processes:

grep 'user' /etc/nginx/nginx.conf

The most common ones are either www-data or nginx. Edit PHP FPM pool configuration file:

/etc/php5/fpm/pool.d/www.conf

Find the following lines:

listen.owner = bob
listen.group = bob

Add the user www-data as a member of secondary group bob

usermod -G bob www-data

Restart the PHP FPM daemon

service php5-fpm restart

Check if the ownership of the socket file has changed

$ ls -l /var/run/php5-fpm.sock
srw-rw---- 1 www-data www-data 0 May 1 22:13 /var/run/php5-fpm.sock

checking which process is running on given port Linux
lsof -i :8000

to kill process running in given port
kill process-id

Some useful Linux commands

To change owner and gropup of file/directory

changes all sub folders too
sudo chown -R username:group directory
changes given folder only
sudo chown username:group directory

The Linux 'unzip' Command
Decompress Single ZIP Files
unzip filename

Decompress Multiple ZIP Files
unzip filename1 filename2 filename3

Exclude Some ZIP Files
unzip filename.zip -x filetoexclude.zip

Extract a ZIP File to a Different Directory
unzip filename.zip -d path/to/extract/to

How to Show the Contents of a Compressed Zip File
unzip -l filename.zip

How to Test If a ZIP File Is Valid
unzip -t filename.zip

Decompress a ZIP File Without Prompting to Overwrite
unzip -n filename.zip

Extract Password-Protected ZIP Files
unzip -P password filename.zip

To compress:

To compress:
zip squash.zip file1 file2 file3

or to zip a directory
zip -r squash.zip dir1

To uncompress:
unzip squash.zip

remove/delete all from directory
rm -rf directoryName

How To Secure Nginx with Let's Encrypt on Ubuntu

Step 1 — Installing Certbot

sudo add-apt-repository ppa:certbot/certbot
sudo apt-get update

And finally, install Certbot's Nginx package with apt-get
sudo apt-get install python-certbot-nginx

Step 2 — Obtaining an SSL Certificate
sudo certbot --nginx -d example.com -d www.example.com

Step 3 — Verifying Certbot Auto-Renewal
sudo certbot renew --dry-run

How to Change MYSQL Root PASSWORD Ubuntu

mysqladmin -u root -p'oldPassword' password 'newPassword'

installing SuiteCRM

cd /tmp && git clone https://github.com/salesagility/SuiteCRM.git suitecrm
sudo mv suitecrm /var/www/suitecrm/

sudo chown -R www-data:www-data /var/www/suitecrm/
sudo chmod -R 755 /var/www/suitecrm/

composer install

To Setup Crontab
In order to run SuiteCRM Schedulers, edit your web server user's crontab file with this command:
sudo crontab -e -u www-data
... and add the following line to the crontab file:
* * * * * cd /var/www/suitecrm; php -f cron.php > /dev/null 2>&1
You should do this only after the installation is concluded.

Read more about this
https://websiteforstudents.com/install-suitecrm-on-ubuntu-16-04-lts-with-nginx-mariadb-php-7-1-and-lets-encrypt-free-ssl-tls/

Detect web traffic source device

http://detectmobilebrowsers.com/mobile