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Sometimes when connecting to a computer with SSH, things can get jumbled up and an error can occur that looks like this:

The purpose of the known_hosts file is for the client to authenticate the server they are connecting to. This error will occur when the public key the host has changes.To fix this we must remove the key causing the error.

Linux / Mac / Windows with MobaXterm

Finding the known_hosts File:

Right-click in the text field labeled Public key for pasting into OpenSSH authorizedkeys file and choose Select All. Right-click again in the same text field and choose Copy. Importing your SSH key. Now you must import the copied SSH key to the portal. After you copy the SSH key to the clipboard, return to your account page. H ow do I create and setup an OpenSSH config file to create shortcuts for servers I frequently access under Linux or Unix desktop operating systems? A global or local configuration file for SSH client can create shortcuts for sshd server including advanced ssh client options. Tagged with linux, ssh, devops, bash. If you're anything like me, you probably log in and out of a half dozen remote servers (or these days. Skip to content. Log in Create account DEV Community. DEV Community is a community of 607,586 amazing developers We're a place where coders share, stay up-to-date and grow their careers.

After you have connected to a computer using ssh, the key you used to connected is stored in a file called known_hosts which is located in a hidden file (.ssh) in your home directory. It can be opened in a text editor of your choice with: Indesign 2020 portable.

You will notice the file is arranged: computername, ip-address veryLongKey, where each line is its own computer and key. If you have a smaller screen the key will continue on to the next line, but is still counted as one line.

Method 1 - Getting Rid of It All

If you only have one host in your know_host file then removing the entire file is a solution. The file will be recreated the next time you ssh into that computer. Before you remove the file you should back up the contents:

Method 2 - Targeting the Key Individually

If you look at the error message you will notice this line:

This tells which is the offending host, so now you can remove that key by running:

This will give you the following output when it is successful:

You can also edit the known_hosts file directly and remove the entire offending line which is indicated by: Offending key in /home/user/.ssh/known_hosts:1. In this case the line is 1. Sany forklift. You may end up deleting something you did not intend to so back the file up first:

Windows with PuTTY

Unlike the other options above, PuTTy does not create a convenient known_hosts folder in your home directory. Instead we need to edit the registry it creates:

  1. Search for regedit.exe and open it
  2. Navigate to HKEY_CURRENT_USER/SOFTWARE/SimonTatham/PuTTy/SshHostKeys
  3. Right click the offending key and click delete

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The Remote Development extension pack allows you to open any folder in a container, on a remote machine, or in the Windows Subsystem for Linux (WSL) and take advantage of VS Code's full feature set. Since this lets you set up a full-time development environment anywhere, you can:

  • Develop on the same operating system you deploy to or use larger, faster, or more specialized hardware than your local machine.
  • Quickly swap between different, isolated development environments and safely make updates without worrying about impacting your local machine.
  • Help new team members / contributors get productive quickly with easily spun up, consistent development containers.
  • Take advantage of a Linux based tool-chain right from the comfort of Windows from a full-featured development tool.

No source code needs to be on your local machine to gain these benefits since Remote Development runs commands and extensions directly on the remote machine.

This Remote Development extension pack includes three extensions:

  • Remote - SSH - Work with source code in any location by opening folders on a remote machine/VM using SSH. Supports x86_64, ARMv7l (AArch32), and ARMv8l (AArch64) glibc-based Linux, Windows 10/Server (1803+), and macOS 10.14+ (Mojave) SSH hosts.
  • Remote - Containers - Work with a sandboxed toolchain or container based application by opening any folder mounted into or inside a container.
  • Remote - WSL - Get a Linux-powered development experience from the comfort of Windows by opening any folder in the Windows Subsystem for Linux.

The Remote SSH extension at work:

System Requirements

Local: See the minimum requirements for VS Code. Windows support in Remote - Containers requires Windows 10 Professional or Enterprise is due to the requirements of Docker Desktop. See installation steps for additional details.

Remote host / container / WSL support:

  • x86_64 / ARMv8l (AArch64) / ARM7l (AArch32) Debian/Raspbian 9+, Ubuntu 16.04+, Ubuntu IoT 18.04+, CentOS / RHEL 7+ SSH hosts, containers, or WSL distributions.
  • x86_64 Alpine Linux 3.7+ containers or WSL distributions (no SSH support yet).

Additional SSH support:

  • Windows 10 / Server 2016/2019 (1803+) using the official OpenSSH Server.
  • macOS 10.14+ (Mojave) SSH hosts with Remote Login enabled.

Other glibc based Linux SSH Hosts, containers, or WSL distributions may work if they have needed prerequisites.

Some extensions installed on ARMv7l (AArch32) and ARMv8l (AArch64) devices may not work due to the use of x86 native code in the extension. Similarly, extensions installed in Alpine Linux containers or the Alpine WSL distribution may not work due to glibc dependencies in native code inside the extension. See the Remote Development and Linux article for details.

Installation

  1. Install VS Code or VS Code Insiders and this extension pack. On Windows, be sure to check Add to PATH when asked to Select Additional Tasks during installation.

  2. Remote - SSH: Install an OpenSSH compatible SSH client.

  3. Remote - WSL: Install the Windows Subsystem for Linux along with your preferred Linux distribution. (Note that WSL2 support is experimental.)

  4. Remote - Containers: Install and configure Docker for your operating system.

    Windows / macOS:

    1. Install Docker Desktop 2.0+ for Mac/Windows. (Docker Toolbox is not supported, but Docker does not need to be running if you use a remote host.)
    2. Right-click on the Docker task bar item and update Settings / Preferences > Shared Drives / File Sharing with any source code locations you want to open in a container. See tips and tricks for details.

    Linux:

    1. Follow the official install instructions for Docker CE/EE 18.06+. If you use Docker Compose, follow the Docker Compose 1.21+ install directions.
    2. Add your user to the docker group by using a terminal to run: sudo usermod -aG docker $USER Sign out and back in again so this setting takes effect.

Working with Git? Here are three tips to consider:

  • If you are working with the same repository folder in Windows and WSL or a container, be sure to set up consistent line endings. See tips and tricks to learn how.
  • In WSL, you can also avoid passwords by configuring WSL to use the Windows Git credential manager. See tips and tricks to for details.
  • For containers, if you clone using a Git credential manager, your container should already have access to your credentials! If you use SSH keys, you can also opt-in to sharing them. See Sharing Git credentials with your container for details.

Getting started

Check out one of the following quick starts to get going.

Available commands

Another way to learn what you can do with the Remote Development extensions is to browse the commands each of them provide. Press F1 to bring up the Command Palette and type in Remote- for a full list of commands.

You can also click on the Remote 'Quick Access' status bar item in the lower left corner to get a list of the most common commands.

For more information, please see the extension pack documentation.

Questions, Feedback, Contributing

Have a question or feedback?

  • See the documentation or the troubleshooting guide.
  • Up-vote a feature or request a new one, search existing issues, or report a problem.
  • Contribute a development container definition for others to use
  • Contribute to our documentation
  • ..and more. See our CONTRIBUTING guide for details.

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Or connect with the community..

Telemetry

The Visual Studio Code Remote Development extension pack and its related extensions collect telemetry data to help us build a better experience working remotely from VS Code. We only collect data on which commands are executed. We do not collect any information about image names, paths, etc. The extension respects the telemetry.enableTelemetry setting which you can learn more about in the Visual Studio Code FAQ.

License

By downloading and using the Visual Studio Remote Development extension pack and its related components, you agree to the product license terms and privacy statement.





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