Dokuwiki is the best Open Source project I have ever used, so I have prepared a simple step-by-step guide to help you get started. It is relatively brief and concise as most of the code was already described in other blog posts found on this website.

Update package index.

$ sudo apt-get update

Install nginx server.

$ sudo apt-get install nginx

Install uWSGI package and php plugin.

$ sudo apt-get install uwsgi uwsgi-plugin-php curl

Install ufw program to manage the firewall.

$ sudo apt-get install ufw

Configure the firewall to allow TCP ports 22 and 80 and deny other incoming connections.

$ sudo ufw allow 80/tcp
$ sudo ufw allow 22/tcp
$ sudo ufw limit 22/tcp
$ sudo ufw default deny  incoming
$ sudo ufw default allow outgoing
$ sudo ufw enable

Increase max upload file size and max post size.

$ sudo sed -i -e "/upload_max_filesize/ {s/\\(.*\\) = .*/\\1 = 25M/}" /etc/php5/embed/php.ini
$ sudo sed -i -e "/post_max_size/       {s/\\(.*\\) = .*/\\1 = 30M/}" /etc/php5/embed/php.ini

Create /srv/dokuwiki directory to store website and Dokuwiki source code.

$ sudo mkdir -p /srv/dokuwiki

Download stable release of Dokuwiki.

$ sudo curl -L -s -o /srv/dokuwiki-stable.tgz http://download.dokuwiki.org/src/dokuwiki/dokuwiki-stable.tgz

Extract Dokuwiki source code.

$ sudo tar --extract --gzip --file /srv/dokuwiki-stable.tgz --strip 1 --directory /srv/dokuwiki

Enable pretty URLs.

$ cat <<EOF | sudo tee /srv/dokuwiki/conf/local.php
<?php
\$conf['userewrite'] = 1;
?>
EOF

Change group and owner to www-data.

$ sudo chown -R www-data:www-data /srv/dokuwiki

Configure PHP interpreter application using uWSGI.

This is a simplified configuration – read Running PHP scripts in uWSGI.
$ cat <<EOF | sudo tee /etc/uwsgi/apps-available/php.ini
[uwsgi]
plugins = php
chown-socket = www-data:www-data
processes = 4
EOF

Enable PHP interpreter.

$ sudo ln -s /etc/uwsgi/apps-available/php.ini /etc/uwsgi/apps-enabled/

Restart uWSGI application.

$ sudo systemctl restart uwsgi

Disable default nginx site.

$ sudo unlink /etc/nginx/sites-enabled/default

Configure nginx site for Dokuwiki.

$ cat <<EOF | sudo tee /etc/nginx/sites-available/dokuwiki
server {
  listen 80 default_server;

  server_name dokuwiki.local;

  client_max_body_size 30M;

  root /srv/dokuwiki;
  index doku.php;

  location / {
    try_files \$uri \$uri/ @dokuwiki;
  }

  location @dokuwiki { 
    rewrite ^/_media/(.*)          /lib/exe/fetch.php?media=\$1   last;
    rewrite ^/_detail/(.*)         /lib/exe/detail.php?media=\$1  last;
    rewrite ^/_export/([^/]+)/(.*) /doku.php?do=export_\$1&id=\$2 last;
    rewrite ^/(?!lib/)(.*)         /doku.php?id=\$1&\$args        last;
  } 

  location ~ /(COPYING|README|VERSION|install.php) {
    deny all;
  }

  location ~ /(conf|bin|inc)/ {
    deny all;
  }

  location ~ /data/ {
    internal;
  }

  location ~ \\.php\$ {
    if (!-f \$request_filename) { return 404; }
    include uwsgi_params;
    uwsgi_modifier1 14;
    uwsgi_pass unix:/run/uwsgi/app/php/socket;
  }
}
EOF

Enable configured site.

$ sudo ln -s /etc/nginx/sites-available/dokuwiki /etc/nginx/sites-enabled/

Reload nginx configuration.

$ systemctl reload nginx

What next?

Perform the following steps to configure Dokuwiki.

Remove created earlier local.php file, temporarily allow access to install.php and use it to configure personal wiki to your liking.

Remember to define rewrite level to 1 after logging in as administrator.