ubuntu

WireGuard is lightweight VPN with extremely simple configuration. All below was tested on Ubuntu 18.04 as server and Anroid 8.0.0 as client.

LXC containers are great for application isolation and safe deployment. Running unprivileged containers is the safest way to run containers in a production environment. This note contains enough information to create your own safe container.

Ubuntu has a very detailed documentation about OpenVPN server configuration. The key feature of this note is script for automatic generation of single-file client configurations (keys and certs are embedded) and sending them by email. Looks interesting? Read below!

Several changes occured since my last note about installing python scientific environment:

• IPython Notebook was succeeded by Jupyter Notebook
• seaborn package is used for the pretty matplotlib plots
• raw virtualenv was replaced by virtualenvwrapper
• procedure of notebook profiles creation and edition has been changed
• ipython bug about pip in virtualenv is obsolete. But now another workaround is needed for packahes installation
• pip installation from pypa is now one-liner

Create frames

This note describes usage of Paraview 4.3 (contrary to previous note with Paraview before 4.1). Some changes were made:

• command line arguments were added to make code more reusable
• it works with Paraview extracted from the archive (4.3.1)
• white background must be specified manually (SetViewProperties(view, Background = [1, 1, 1]) in the code)

Lately NVIDIA added repository for Ubuntu 12.04 and Ubuntu 14.04. Recently I hit problem with missing dependencies for libcheese-gtk23 and libcheese7 libraries while installing latest CUDA 6.5 on clean Ubuntu 14.04. Remedy to this can be found on askubuntu. So, the complete set of commands is below.

I've completed setting up my comfort set of LXC containers and want to save some points I spent a lot of time for or things for copy-paste.

I used the official Ubuntu Server Guide but note at Digital Ocean knowledge base also helped me a lot. I created 3 containers: one for vpn, one for site on Drupal and last one as www proxy for second one with nginx only.

This note is similar to previous drupal and joomla installations. Install requirements (webserver, php5, DB server, DB adapter for php) as root:

apt-get install -y nginx php5-fpm nginx postgresql php5-pgsql php5-gd

Note: I've created an updated page with most recent instructions for Jupyter Notebook.

This note describes installation of Bittorrent Sync on Ubuntu. Tutorial was tested on Ubuntu 12.04, but it must work for all Debian-based systems. Read full btsync manual for advanced information.

To enable tun device in OpenVZ containers tun module

• needs to be loaded in the host system (in my case CentOS 6.4)
• containter (in my case Ubuntu Server 12.04) must be allowed to use tun

This howto is based on two sources: Official wiki and Amutu blog entry. In short, the main difficulty is in bridge network configuration: correct network configuration doesn't work in CentOS 6.4 while NetworkManager is running. I compiled official documentation and fix found in Amutu blog here in one entry.

Depends on server configuration, each OpenVPN client needs configuration file (client.conf for *nix and client.ovpn for windows), certificate authority (ca.crt), [optional] tls auth file (ta.key), user crt and key.

SLURM (Simple Linux Utility for Resource Management) — job scheduler and resource manager usually installed on supercomputers. For example, it runs on Lomonosov supercomputer in MSU, Moscow, Russia.

Default Drupal package in Ubuntu installs Apache, but I prefer nginx as a webserver. In this note I’ll describe steps necessary to get Drupal 7 work.

In i3 window manager by default Nautilus actually opens two windows: Desktop window and Nautilus itself. The former can’t be closed by the default shortcut $Mod+Shift+Q.

We all do backups. This note is about doing them on Ubuntu 12.04.

Tasks:

• archive important folders
• dump mysql databases
• upload all to yandex.disk (online web storage with 10GB space)
• delete old backups

I’ll save only backups for last five days.

After moving to i3 I’ve installed PCManFM as GUI file manager. To fix missing icons one have to define icon theme. These instructions are tested on Ubuntu 12.04, but it must work with other distros.