Introduction PostgreSQL is a powerful object-relational database management system, provided under a flexible BSD-style license.[1] PostgreSQL contains many advanced features, is very fast and standards compliant. PostgreSQL has bindings for many programming languages such as C, C++, Python, Java, PHP, Ruby... It can be used to power anything from simple web applications to massive databases … Continue reading Install PostgreSQL on ubuntu
Ubuntu
SSH/OpenSSH/Keys on Ubuntu
Public and Private Keys Public key authentication is more secure than password authentication. This is particularly important if the computer is visible on the internet. If you don't think it's important, try logging the login attempts you get for the next week. My computer - a perfectly ordinary desktop PC - had over 4,000 attempts … Continue reading SSH/OpenSSH/Keys on Ubuntu
What information iwconfig provides on Ubuntu
Question: lo no wireless extensions. eth0 no wireless extensions. wmaster0 no wireless extensions. wlan0 IEEE 802.11bgn ESSID:"Network" Mode:Managed Frequency:2.412 GHz Access Point: Not-Associated Tx-Power=20 dBm Retry min limit:7 RTS thr:off Fragment thr=2352 B Power Management:off Link Quality:0 Signal level:0 Noise level:0 Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 … Continue reading What information iwconfig provides on Ubuntu
Scan available wifi access points on Ubuntu
Turn on the interface and scan all available WiFi networks sudo ifconfig wlan0 up sudo iwlist wlan0 scan Anther way to turn up and off wifi interface (ifdown will release the existing IP address to the DHCP server; ifup will get another IP address from the DHCP server) sudo ifdown wlan0 sudo ifup wlan0 A … Continue reading Scan available wifi access points on Ubuntu
How to stop and restart an X server on Ubuntu
Make sure you are logged out first. Hit Ctrl+Alt+F1 and login using your credentials. kill your current X server session by typing sudo service lightdm stop or sudo lightdm stop Enter runlevel 3 by typing sudo init 3 Do whatever you need to do You might be required to reboot when the installation finishes. If … Continue reading How to stop and restart an X server on Ubuntu
Amazon Greengrass launches as a snap on Ubuntu
https://youtu.be/1rLxPOxVJoQ Personal note: Take a look at Ubuntu Core with Qt for Internet of Things development (6/25/2017) Last week, Amazon launched Greengrass, their new IoT platform allowing developers to create intelligent edge software. Amazon is collaborating with a variety of manufacturers to make Greengrass available on as many devices as possible from home gateways, industrial gateways … Continue reading Amazon Greengrass launches as a snap on Ubuntu
On Nautilus-dropbox installation on Ubuntu
I'll have to say it's somewhat problematic... The installation usually would stalk somewhere and later gives you this error: E: Unable to lock the administration directory /var/lib/dpkg/lock? How to fix it: sudo rm /var/lib/dpkg/lock should do the trick. You can use ps afx|grep dpkg to check if there is still a process runnning at the … Continue reading On Nautilus-dropbox installation on Ubuntu
How to install a USB WiFi adapter on Raspberry Pi or Ubuntu?
How to install TP-Link TL-WN725N on Raspberry Pi The TP-Link TL-WN725N is known as a hard one to get working on your Raspberry Pi. After searching for a long time, I finally got it working. In this post, I will tell you how to install it. It is recommended to upgrade your Raspberry Pi first. … Continue reading How to install a USB WiFi adapter on Raspberry Pi or Ubuntu?
How to install WordPress on a localhost (Ubuntu/Debian)
1. Install a LAMP stack (apache2, php, mariaDB) sudo apt update sudo apt install apache2 mariadb-server sudo apt install php php-mysql -y Don't forget to run sudo mysql_secure_installation MySql will ask you to set up a password for the root account. Check your IP address (ifconfig) and put it in a browser. This will make … Continue reading How to install WordPress on a localhost (Ubuntu/Debian)
How to install WordPress locally on Ubuntu/Debian?
WordPress is a content management system originally developed for blogging, but has been greatly expanded through widgets, themes and plugins. Complete the following steps to install WordPress on a Ubuntu 12.04 workstation ("server") so that you can try different plugins and theme, before you get your blog online. 1. Pre-reqs (Apache, PHP, and MySQL) sudo … Continue reading How to install WordPress locally on Ubuntu/Debian?
Eric's playground 