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Adjusting child processes for PHP-FPM (Nginx)

When setting these options consider the following:

• How long is your average request?
• What is the maximum number of simultaneous visitors the site(s) get?
• How much memory on average does each child process consume?

Determine if the max_children limit has been reached.

• sudo grep max_children /var/log/php7-fpm.log

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VirtualBox Host-Only Static IP

My typical setup for a development box in VirtualBox uses two NICs. The first uses NAT to allow the box to communicate with the outside world through my host computer’s network connection. (NAT is the default, so shouldn't require any setup.) The second is a "host-only" connection that allows my host and guest to interact.

To create a host-only connection in VirtualBox, start by opening the preferences in VirtualBox. Go to the "Network" tab, and addd a Host-only Network. Modify the host-only network, and disable DHCP. Make a note of the IP address. (Feel free to set the IP address as well, if you like.)

Next, assign this host-only adapter to the virtual machine. Select the VM and press "Settings". Go to the "Network" tab, and select "Adpater 2". Enable the adapter, set it to a "Host-only Adapter", and select the adpater you created above.

Temporary

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INSTALL Hadoop 3.1 on Debian 9.5

1. Install some dependencies:

   su -
   apt -y install build-essential autoconf automake libtool cmake zlib1g-dev pkg-config libssl-dev libsasl2-dev \
   libsnappy-dev bzip2 libbz2-dev libjansson-dev fuse libfuse-dev zstd \
   clang libc6-dev libtool libzip-dev libncurses-dev liblzo2-dev  \
 software-properties-common dirmngr python python-dev python-setuptools \

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server {
    listen       80;
    server_name  localhost;
    root       /Users/YOUR_USERNAME/Sites;
 
    access_log  /Library/Logs/default.access.log  main;
 
    location / {
        include   /usr/local/etc/nginx/conf.d/php-fpm;
    }

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<?php

class SecureSessionHandler extends SessionHandler {

    protected $key, $name, $cookie;

    public function __construct($key, $name = 'MY_SESSION', $cookie = [])
    {
        $this->key = $key;
        $this->name = $name;