How to: Create Passwordless SSH Remote Login

The intention is simple: just let me in without asking for password again and again!

 Follow the steps to achieve this:

 1. Generate RSA key from host machine (skip this if you have already got one)

 ssh-keygen -t rsa -C <youremail@email.com>

 Accept the default location and DO NOT give a password to it.

 2. Copy the RSA key generated to your remote machine

 cat ~/.ssh/id_rsa.pub | ssh root@<remotemachineipaddress> 'cat >> ~/.ssh/authorized_keys'

 So far, it is all done.

 3. A step further

 It would be great if can we save the time on typing the hideous 'SSH' and 'blarblar@blar.blar.blar.blar' as well, wouldn't it? Set up an alias for it from your host machine then.

 alias apple='ssh root@<remotemachineipaddress>'

Put the line into '~/.bashrc' so that it would persist.

 And there we go, apple is your new login!

Comments

Post a Comment

Popular posts from this blog

How to: Add Watermark to PDFs Programmatically using iTextSharp

Being able to add text or image watermark to PDF files is one of those handy things you can archive via program. The only library required for the little program is iTextSharp . For those who haven't used it yet, iTextSharp is a C# version of iText , which allows you to generate or manipulate PDFs. So let's cut the chitchat, and go straight to the code. By calling 'AddTextWatermark' or 'AddImageWatermark' function with required parameters supplied, you are ready to rock! public void CreateTemplate(string watermarkText, string targetFileName){     var document = new Document();     var pdfWriter = PdfWriter.GetInstance(document, new FileStream(targetFileName, FileMode.Create));     var font = new Font(Font.FontFamily.HELVETICA, 60, Font.NORMAL, BaseColor.LIGHT_GRAY);     document.Open();     // Specify font and alignment of text watermark     ColumnText.ShowTextAligned(pdfWriter.DirectContent, Element.ALIGN_CENTER, new ...
Read more

A practical guide to Scala Traits

Trait - has a super class of AnyRef   - uses extends  or with for inheriting a trait ( with to inherit multiple traits)   - defines a type   - can be overridden using override  keyword   Trait vs Interface (Java)   - trait can declare fields and main state   - rich vs thin interfaces (every concrete method added to trait makes it richer)   Trait vs Class   - trait can NOT have any class parameters        trait doesn't support coding in this style: class Point(x: Int, y: Int) - super calls are statically bound in classes, but dynamically bound in trait         super.toString  is predicable in classes, but not in trait when mixing   Ordered Trait   Traits as stackable modifications   - order of mixins: right most trait takes effect first   When to use Trait?   - If the behaviour will not be reused, then make it a concrete class   - If it might be reused in multip...
Read more

A Short Guide to AWK

AWK is built to process column-oriented text data, such as tables. In which a file is considered to consist of N records (rows) by M fields (columns) Basic # awk < file ‘{print $2}’ # awk ‘{print $2}’ file file = input file print $2 = 2nd field of the line, awk has whitespace as the default delimiter Delimiter # awk -F: ‘{print $2}’ file -F: = use ‘:’ as delimiter # awk -F ‘[:;]’ ‘{print $2}’ file -F ‘[:;]’ = use multiple delimiter, and parse using EITHER ‘:’ OR ‘;’ # awk -F ‘:;’ ‘{print $2}’ file   -F ‘:;’ = use multiple delimiter, and parse using ':;’ as THE delimiter # awk -F ‘:’+ ‘{print $2}’ file   -F ‘:’+ = use multiple delimiter, to match any number ':' Arithmetic # echo 5 4 | awk '{print $1 + $2}' output is '9', the result of ‘+’ (works as addition) # echo 5 4 | awk '{print $1 $2}' output is '54', to get string concatenation #  echo 5 4 | awk '{print $1, $2}' output is '5 4',...
Read more