Ubuntu 16.04 VPS Setup: SSH Key auth + ufw + mysql + apache + multiple PHP versions via phpbrew + nodejs via nvm

vps setup

# update before installation
apt-get update && apt-get upgrade
dpkg-reconfigure tzdata

# SSH Key Auth
ssh-keygen -o -a 100 -t ed25519
cd ~/.ssh/ && cat id_ed25519.pub >> authorized_keys
service ssh restart

# firewall
ufw allow ssh && ufw allow http && ufw allow https
ufw default deny incoming && ufw default allow outgoing
ufw enable

# mySQL
apt-get install -y mysql-server mysql-client && mysql_secure_installation

# Apache
apt-get install -y apache2 curl
a2enmod rewrite && a2enmod proxy && a2enmod ssl
service apache2 restart

# default php 7
apt-get install -y php curl php-curl libapache2-mod-php php-mysql php-bcmath php-opcache php-apcu php-intl php-curl php-gd php-gettext php-mbstring php-mcrypt php-pear php-soap php-tidy php-xmlrpc php-zip php-bz2

# manual php build:
cd /opt
wget http://de.php.net/get/php-5.6.30.tar.bz2/from/this/mirror -O php-5.6.30.tar.bz2
tar jxf php-5.6.30.tar.bz2
cd php-5.6.30
make && make install
./configure --prefix=/opt/php-5.6.30 --with-config-file-scan-dir=/opt/conf.d/ --enable-bcmath --enable-calendar --enable-exif --enable-ftp --enable-gd-native-ttf --enable-inline-optimization --enable-opcache --enable-mbregex --enable-mbstring --enable-pcntl --enable-soap --enable-sockets --enable-sysvsem --enable-sysvshm --enable-zip --disable-rpath --with-bz2 --with-curl --with-freetype-dir --with-gd --with-gettext --with-iconv --with-jpeg-dir=/usr --with-kerberos --with-libdir=/lib/x86_64-linux-gnu --with-libxml-dir=/usr --with-mcrypt --with-mhash --with-mysql --with-mysqli --with-mysql-sock=/var/run/mysqld/mysqld.sock --with-openssl --with-pcre-regex --with-pdo-mysql --with-png-dir=/usr --with-tidy --with-xmlrpc --with-xpm-dir=/usr/ --with-xsl --with-zlib --with-zlib-dir
cp /opt/php-5.6.30/php.ini-production /opt/php-5.6.30/lib/php.ini
cp /opt/php-5.6.30/etc/php-fpm.conf.default /opt/php-5.6.30/etc/php-fpm.conf

# PHPbrew
curl -L -O https://github.com/phpbrew/phpbrew/raw/master/phpbrew
chmod +x phpbrew
mv phpbrew /usr/local/bin/phpbrew
mkdir -p /opt/phpbrew
phpbrew init --root=/opt/phpbrew
export PHPBREW_ROOT=/opt/phpbrew
export PHPBREW_HOME=/root/.phpbrew
### add to ~/.bashrc: ###
export PHPBREW_ROOT=/opt/phpbrew
export PHPBREW_HOME=/root/.phpbrew
source ~/.phpbrew/bashrc
### restart ssh session ###
apt-get install lcov libbz2-dev libgmp3-dev libmcrypt-dev libreadline-dev libedit-dev libtidy-dev libgd2-dev libxpm-dev libpng-dev libjpeg-dev libcurl4-gnutls-dev

# install php via phpbrew
phpbrew --debug install 5.6 +everything -sqlite -pgsql -dtrace -gmp
### edit php config file: /opt/phpbrew/php/php-5.6.30/etc/php-fpm.conf
### replace: "nobody" with "www-data"
### change: listen.owner = root
### change: listen.group = www-data
### change: error_log = /var/log/apache2/php-fpm-5.6.log
chown root:www-data /opt/phpbrew/php/php-5.6.30/var/run/php-fpm.sock
phpbrew fpm start php-5.6.30

# nvm 
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.1/install.sh | bash
nvm install stable