Engineering and technology
Anna Fedorova
Anna Borysivna Fedorova (Ukrainian: А́нна Бори́сівна Фе́дорова; born 27 February 1990) is a Ukrainian concert pianist. Fedorova performs as soloist, chamber musician and with symphony orchestras in the major concert halls of the Netherlands, Germany, France, Italy, UK, Ukraine, US, Mexico, Argentina, and Asia. Fedorova is a David Young Piano Prize Holder supported by a Soiree d’Or Award and Keyboard Trust.
16.04 – MySQL won’t start because of AppArmor? – Ask Ubuntu
mysql – how to open port 3306
Fix disappearing files and folders in Windows 10 and bring them all back
Setup Your Gradebook 3.0: Arrange & Customize the Gradebook in Moodle
shell – Access mysql remote database from command line – Stack Overflow
mysql -u {username} -p {password} \
-h {remote server ip or name} -P {port} \
-D {DB name}
Source: shell – Access mysql remote database from command line – Stack Overflow
ubuntu – Why should I enable IO APIC in VirtualBox? – Server Fault
Enable I/O APIC
Advanced Programmable Interrupt Controllers (APICs) are a newer x86 hardware feature that have replaced old-style Programmable Interrupt Controllers (PICs) in recent years. With an I/O APIC, operating systems can use more than 16 interrupt requests (IRQs) and therefore avoid IRQ sharing for improved reliability.
Note: Enabling the I/O APIC is required for 64-bit guest operating systems, especially Windows Vista; it is also required if you want to use more than one virtual CPU in a virtual machine.
However, software support for I/O APICs has been unreliable with some operating systems other than Windows. Also, the use of an I/O APIC slightly increases the overhead of virtualization and therefore slows down the guest OS a little.
Warning: All Windows operating systems starting with Windows 2000 install different kernels depending on whether an I/O APIC is available. As with ACPI, the I/O APIC therefore must not be turned off
Source: ubuntu – Why should I enable IO APIC in VirtualBox? – Server Fault
How To Create a Self-Signed SSL Certificate for Apache in Ubuntu 16.04
Step 1: Create the SSL Certificate
TLS/SSL works by using a combination of a public certificate and a private key. The SSL key is kept secret on the server. It is used to encrypt content sent to clients. The SSL certificate is publicly shared with anyone requesting the content. It can be used to decrypt the content signed by the associated SSL key.
We can create a self-signed key and certificate pair with OpenSSL in a single command:
$ sudo openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /etc/ssl/private/apache-selfsigned.key -out /etc/ssl/certs/apache-selfsigned.crt
Modify the Default Apache SSL Virtual Host File
Next, let’s modify /etc/apache2/sites-available/default-ssl.conf, the default Apache SSL Virtual Host file. If you are using a different server block file, substitute it’s name in the commands below.
Before we go any further, let’s back up the original SSL Virtual Host file:
<IfModule mod_ssl.c>
<VirtualHost _default_:443>
ServerAdmin your_email@example.com
ServerName server_domain_or_IP
DocumentRoot /var/www/html
ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined
SSLEngine on
SSLCertificateFile /etc/ssl/certs/apache-selfsigned.crt
SSLCertificateKeyFile /etc/ssl/private/apache-selfsigned.key
<FilesMatch "\.(cgi|shtml|phtml|php)$">
SSLOptions +StdEnvVars
</FilesMatch>
<Directory /usr/lib/cgi-bin>
SSLOptions +StdEnvVars
</Directory>
</VirtualHost>
</IfModule>
Step 3: Enable the Changes in Apache
Now that we’ve made our changes and adjusted our firewall, we can enable the SSL and headers modules in Apache, enable our SSL-ready Virtual Host, and restart Apache.
We can enable mod_ssl, the Apache SSL module, and mod_headers, needed by some of the settings in our SSL snippet, with the a2enmod command:
$ sudo a2enmod ssl
$sudo a2enmod headers
Next, we can enable our SSL Virtual Host with the a2ensite command:
$ sudo a2ensite default-ssl
$ sudo service apache2 restart
Source: How To Create a Self-Signed SSL Certificate for Apache in Ubuntu 16.04 | DigitalOcean