nhthai2005

Some Important Commands

1. Use to start a stopped node

docker-machine start node_name;                 

2. Use to stop a running node

docker-machine stop node_name;                 

3. Use to check docker nodes

docker-machine ls;                                         

4. Use to check ip of a node

docker-machine ip node_name;                     

5. Use to check node list

nhthai2005

Quick setup — if you’ve done this kind of thing before

Supposed that https://github.com/nhthai2005/DNS-Server.git Get started by creating a new file or uploading an existing file. We recommend every repository include a README, LICENSE, and .gitignore.

...create a new repository on the command line

echo "# DNS-Server" >> README.md git init git add README.md git commit -m "first commit" git branch -M master

nhthai2005

Vagrant.configure("2") do |config|
    config.ssh.insert_key = false
    config.vm.box = "centos/7"
    config.vm.network "private_network", ip: "192.168.99.2"
    config.vm.hostname = "ansible"
    config.vm.synced_folder ".", "/vagrant", type: "virtualbox"
    config.vm.provider "virtualbox" do |vb|
        vb.name = "Ansible-Playbooks"
        vb.cpus = 2
        vb.memory = "4096"

nhthai2005

Finding Checksum Values in Windows 10

One method uses the command certutil in the command prompt window. For example:

certutil -hashfile c:\Users\JDoe\Desktop\abc.exe SHA512

This command returns the SHA512 hash of file abc.exe located at the specified file path. You may use other values after SHA, such as 1 or 256, to produce the corresponding hash, and you may substitute MD5 or other supported parameters.

Another method is to use Windows PowerShell (version 5.1 for me) with the command Get-FileHash:

nhthai2005

#!/bin/bash
sudo curl -L "https://github.com/docker/compose/releases/download/1.29.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose

nhthai2005

The simplest solution, use the dos2unix command (sometimes named fromdos, d2u or unix2dos):

dos2unix filename

Using the stream editor sed:

sed -e "s/\r//g" file > newfile

Using perl:

perl -p -e 's/\r//g' file > newfile

Using a terminal editor vi or vim:

nhthai2005

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)

nhthai2005

Split Panes for Multiple Shells at Once

Here are some other keyboard shortcuts for working with panes:

• Create a new pane, splitting horizontally: Alt+Shift+- (Alt, Shift, and a minus sign)
• Create a new pane, splitting vertically: Alt+Shift++ (Alt, Shift, and a plus sign)
• Move pane focus: Alt+Left, Alt+Right, Alt+Down, Alt+Up
• Resize the focused pane: Alt+Shift+Left, Alt+Shift+Right, Alt+Shift+Down, Alt+Shift+Up
• Close a pane: Ctrl+Shift+W

nhthai2005

# How to cycle through reverse-i-search in BASH?
# vi ~/.inputrc

"\e[A": history-search-backward
"\e[B": history-search-forward

nhthai2005

#!/bin/bash
git restore *
git clean -fd
git reset --hard