Skip to main content

How to add users to your AWS EC2 Linux instance

Do you need to add more users to your AWS EC2 Linux instance? This is a step-by-step tutorial to guide you through the basic process.

1) Open a terminal session and navigate to the path where you have your-key-pair.pem file

2) Type the following command in order to extract the public key from your key pair
ssh-keygen -y -f your-key-pair.pem
3) You will get as a response a string like the one below. Copy it to your clipboard.
ssh-rsa AAAAB3NzaC1yVh0/ThkcfO479gFjMUVw48D2Pi4u0P+0lvP0tpzKcZ/nwnzhFIDyUHsVKMN0F97DCoPQEbk5jmyHRSBok+cuEXAMPLEt1VI7TLSAwWZj5aRedb+awFDLxBgS8SN/nvsaP4+KY8uGum10YV83/wGNZjYEVRLg9NjyDbuVERYFAKEhscyZAbWTMw2t30JELizxyXZx4s4OImfS4yOCnDLFgHFf3JUjGhTUg1O+10I3V2TB3j63166AEB+98JizrRtwJ85AUN/wmMD0V2YIiEaa2rMLbdGZw8lSlPakV3bedx+8NYf+s2+SLwB
4) Login with your ec2-user to your instance, as usual.
ssh -i your-key-pair.pem ec2-user@yourawspublicip
5) Create a Linux user account on the EC2 instance
sudo adduser username
6) OPTIONAL: Only if you want to give this user sudo access, do the following:
  • Switch to root: sudo su -
  • Open sudo config file: visudo
  • Add this line to the commands section: username  ALL=(ALL)  NOPASSWD:ALL

7) Switch to the user you have just created
sudo su - username
8) Create a .ssh directory
mkdir .ssh
9) Change permissions of this directory
chmod 700 .ssh
10) Create a new file authorized_keys in this directory and paste the public key that you have on your clipboard. Make sure that it doesn't miss the first letter.
vi .ssh/authorized_keys
11) Change permissions of this file
chmod 600 .ssh/authorized_keys
12) Send your-key-pair.pem file to the new user. She will be able to connect to the EC2 instance running the following command from the same folder where she has placed your-key-pair.pem file.
ssh -i your-key-pair.pem username@yourawspublicip
13) If thy get public key error, make sure they give the right permissions to your-key-pair.pem.
    chmod 600 your-key-pair.pem

Popular posts from this blog

How to disable cookies on Google Analytics so that you don't need a consent banner

The integration of Google Analytics into a website or blog is not GDPR-compliant by default . You must first obtain explicit consent of the end-users to store cookies, describing in your privacy policy how you intend to use collected personal data. This is the reason why most websites nowadays display an annoying (but necessary) consent banner. If you fail to do so or if you only ask for implicit consent, you are at risk of being fined. However, it is possible to disable cookies on Google Analytics (GA) respecting end-users privacy, so that you don't need to ask for consent. The downside is that you will not be able to distinguish the type of user (unique vs new vs returning) and you will miss some session insights. If these details are not relevant for you, here is how you do it. Disable Google Analytics cookies on a custom website If you have a custom website with full access to the source code, you can simply insert the script below between the <head>  and </head>...

How to convert a PWA into an Android app in 5 minutes

In early 2021 I developed a memory game called Kobadoo  as a PWA (Progressive Web App) using ReactJS. It works pretty well as a browser game and gets decent traffic, but I wanted to reach more potential users by making it available on the official mobile app marketplaces. Since I didn't want to spend any time coding a native app, the easiest solution I found was to convert the PWA into a TWA (Trusted Web Activities) app. It barely takes 5 minutes to do it. TWA essentially allows you to easily create an Android app ( .apk file) that displays a full-screen browser view of your PWA. The user experience is almost identical to a web app and the views from the TWA will count as traffic on your web app. This means that if you have ads on your PWA, they will still work (and generate revenue) from the TWA. Another advantage is that every update you make on the PWA will be immediately reflected on the TWA without the need to submit a new version on Google Play. Here's how I convert...

How to change a post thumbnail in Blogger

If you have ever published a post on Blogger with more than one image on it, you might know that the featured image  (also called post thumbnail ) that is displayed in your blog's landing page is always the first image in the post. Blogger does not provide an editor tool to change this thumbnail. However, there is a workaround that will enable you to set the image you want. Find the Image URL. You can do this by right-clicking on an image of your choice from your browser and selecting Copy image address . Note that it can be any image that is publicly available on the Internet, not only from your post. Changing your post HTML code. From Blogger editor tool, click on the pencil, then select HTML view . Add the following line at the very start of your HTML code: <img src=" https://www.example.com/image.png " style="display:none;"/> where the URL in red is the one you copied in step 1. Click on Publish . That's it! The chosen image will be displayed as ...