NoSQL Databases

Types of NoSQL Databases

  • Document store types ( MongoDB and CouchDB)
  • Key-Value store types ( Redis and Volgemort)
  • Column store types ( Cassandra)
  • Graph store types ( Neo4j and Giraph)
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Run Docker inside LXD

To run Docker inside LXD, we need to change the security.nesting as true.

lxc launch ubuntu-daily:16.04 docker -c security.nesting=true


lxc config set docker security.nesting true
lxc restart docker
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Italic fonts in iTerm2 tmux and vim

Run following command to fix italic fonts

{ infocmp -1 xterm-256color ; echo -e "\tsitm=\\E[3m,\n\tritm=\\E[23m,"; } > xterm-256color.terminfo
tic xterm-256color.terminfo
rm xterm-256color.terminfo
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Setup Manjaro Xfce Desktop

Enable touchpad tap to click

  1. Install xorg-xinput via Package Manager
  2. Query touchpad device id
    xinput list

    Output example:

    ⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
    ⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
    ⎜   ↳ Sony Vaio Jogdial                       	id=7	[slave  pointer  (2)]
    ⎜   ↳ SynPS/2 Synaptics TouchPad              	id=14	[slave  pointer  (2)]
    ⎜   ↳ Logitech USB Receiver                   	id=12	[slave  pointer  (2)]
    ⎜   ↳ Logitech USB Receiver                   	id=11	[slave  pointer  (2)]
    ⎣ Virtual core keyboard                   	id=3	[master keyboard (2)]
     ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboard (3)]
     ↳ AT Translated Set 2 keyboard            	id=13	[slave  keyboard (3)]
     ↳ Video Bus                               	id=8	[slave  keyboard (3)]
     ↳ Sony Vaio Jogdial                       	id=15	[slave  keyboard (3)]
     ↳ Sony Vaio Keys                          	id=6	[slave  keyboard (3)]
     ↳ Power Button                            	id=9	[slave  keyboard (3)]
     ↳ Logitech USB Receiver                   	id=16	[slave  keyboard (3)]
     ↳ UVC Camera (05ca:18b5)                  	id=10	[slave  keyboard (3)]
  3. List TouchPad properties
    xinput list-props 14

    Output example:

    Device 'SynPS/2 Synaptics TouchPad':
     Device Enabled (142):	1
     Coordinate Transformation Matrix (144):	1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
     libinput Tapping Enabled (295):	0
     libinput Tapping Enabled Default (296):	0
     libinput Tapping Drag Enabled (297):	1
     libinput Tapping Drag Enabled Default (298):	1
     libinput Tapping Drag Lock Enabled (299):	0
     libinput Tapping Drag Lock Enabled Default (300):	0
     libinput Tapping Button Mapping Enabled (301):	1, 0
     libinput Tapping Button Mapping Default (302):	1, 0
     libinput Accel Speed (281):	0.000000
     libinput Accel Speed Default (282):	0.000000
     libinput Natural Scrolling Enabled (277):	0
     libinput Natural Scrolling Enabled Default (278):	0
     libinput Send Events Modes Available (262):	1, 1
     libinput Send Events Mode Enabled (263):	0, 0
     libinput Send Events Mode Enabled Default (264):	0, 0
     libinput Left Handed Enabled (286):	0
     libinput Left Handed Enabled Default (287):	0
  4. Enable tap to click
    xinput set-prop 'SynPS/2 Synaptics TouchPad' 'libinput Tapping Enabled' 1
  5. Add command in step 4 to .xsession file to make sure enable tape to click after reboot
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Force Replication Between Domain Controllers

  1. Open Active Directory Sites and Services: On the Start menu, point to Administrative Tools, and then click Active Directory Sites and Services.
  2. In the console tree, expand Sites, and then expand the site to which you want to force replication from the updated server.
  3. Expand the Servers container to display the list of servers that are currently configured for that site.
  4. Expand the server objects and click their NTDS Settings objects to display their connection objects in the details pane. Find a server that has a connection object from the server on which you made the updates.
  5. Click NTDS Settings below the server object. In the details pane, right-click the connection object whose From Server is the domain controller that has the updates that you want to replicate, and then click Replicate Now.
  6. When the Replicate Now message box appears, review the information, and then click OK.
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BI Report Tools

Our database has more then 42 millions records. We need to create reports for different roles.
I prefer opensource BI since we can build the website on our own server and access data directly.

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How to install pip on Ubuntu 16

  1. Upgrade packages to the latest version
    sudo apt-get update && sudo apt-get -y upgrade
  2. Install python-pip
    sudo apt-get install python-pip
  3. Check version
    pip -V
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