Capture Screen on Chromebook
CTRL + Switch screen = Capturing the whole screen
CTRL + SHIFT + Switch Window = Capturing a partial screen
Install Hadoop 2.8.2 HA on Centos
Assume all servers have been installed Centos 7 and all DNS records have been created on DNS Server.
LVM Common Tasks
- Initializing disks or disk partitions
For entire disks:$ pvcreate /dev/sdaFor partitions:
$ pvcreate /dev/sda1
Linux Parted Command to Create, Resize and Rescue Disk Partitions
Running parted command with ROOT user
Proxy Websocket Connection via Apache
- Enable mod_proxy_wstunnel
sudo a2enmod mod_proxy_wstunnel
Force User Logout on Linux
There are two commands can be used: skill and pkill
- Halt/Stop a user
skill -STOP -u <username>or
pkill -STOP -u <username>
Change User Password via Django
Create super user
$ python manage.py createsuperuser
Configure Static DNS on Centos
Modify /etc/sysconfig/network-scripts/ifcfg-eth0
PEERDNS=no
DNS1=8.8.8.8
DNS2=8.8.4.4
HTTP 413 Request Entity Too Large Error
- Fix Nginx
ETL and Tools
- What is ETL?
ETL is short for extract, transform, load, three database functions that are combined into one tool to pull data out of one database and place it into another database.- Extract - reading data from original database
- Transform - converting extract data from original form to target form. (rules or lookup tables or combining the data with other data)
- Load - writing data to target database