hemantshekhawat

###### Install Apache/httpd and PHP
# Before you begin any installation, make sure that your software is up to date:
sudo yum update
#Install Apache:
sudo yum install httpd
#Start Apache:
sudo systemctl start httpd.service
#Set Apache to start on server boot:
sudo systemctl enable httpd.service

nikhita

How to update the Go version

System: Debian/Ubuntu/Fedora. Might work for others as well.

1. Uninstall the exisiting version

As mentioned here, to update a go version you will first need to uninstall the original version.

To uninstall, delete the /usr/local/go directory by:

rosiehoyem

Install Airflow

1. Install Airflow

Follow the installation instructions on the Airflow website.

Update Airflow Configurations

To configure Airflow to use Postgres rather than the default Sqlite3, go to airflow.cfg and update this configuration to LocalExecutor:

# The executor class that airflow should use. Choices include

zacgx

# this script has been tested and worked in a freshly installed Ubuntu 16.04 and 16.10
# it assumes that you are running airflow in a private netowrk and no need to be worry about outside access
# if that's not the case, the lines for PostgreSQL and Redis in this script need to be updated accordingly
# run as root
sudo su

# initial system updates and installs
apt-get update && apt-get upgrade -y && apt-get autoremove && apt-get autoclean

apt-get -y install build-essential binutils gcc make git htop nethogs tmux

mikaelMortensenADI

How to Install VNC on an AWS EC2 Centos 7.2 AMI
Reference: http://devopscube.com/how-to-setup-gui-for-amazon-ec2-rhel-7-instance/

1. Update the server using the following command.

sudo yum -y update

2. Install the gnome GUI components using the following command.

sudo yum groupinstall -y "Server with GUI"

jtferns

Setup

1. Launch Cmder

• 

2. Right-click on the console tab
3. Select New Console... to launch the ConEmu console create dialog

• 

4. In the New Console Split section, select the To right radio option click the Start button

• 

5. Congrats, you now have a half-n-half or 50-50 horizontal split!

Kartones

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

madan712

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

rgreenjr

-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

fabriciocolombo

JDBC Connection URLs for 22 Databases

Source

PostgresSQL JDBC connection URL

jdbc:postgresql:template1
org.postgresql.Driver

MySQL JDBC connection URL