MohammadrezaJavid

PostgreSQL Master-Slave

General concepts

 What's a slave and master?

 In postgresql, we can have a database called Replica,
 whose data is always synced with the primary database(Master).
 Slave is usually used for backup and read only.

MohammadrezaJavid

[servers]
192.168.102.2
192.168.103.2
192.168.100.139

MohammadrezaJavid

virt-clone --original virtual_name_src --name new_name --file path/new_name.qcow2

• virtual_name_src for show all vm name:

virsh list --all

MohammadrezaJavid

#! /bin/bash

read -p "interface name: " intf
read -p "ip addr: " addr
read -p "sub net: " sub
read -p "gate way: " gate
read -p "dns ips: (format: 8.8.8.8, 1.1.1.1, 8.8.4.4): " dns

sudo touch /etc/netplan/01-netcfg.yaml

MohammadrezaJavid

curl -s https://api.github.com/repos/docker/compose/releases \
| grep "docker-compose-linux-x86_64" \
| cut -d : -f 2,3 \
| tr -d \" \
| grep -v "," \
| grep -v ".sha256" \
| head -n 1