In my case it happened because I previously had ssh connection with a machine with same ip(say 188.8.131.52) and the system was considering the RSA key(stored in /home/user_name/.ssh/known_hosts) of the previous host which resulted in mismatch.
Then to solve this problem, on your local computer (i.e. host machine not container) go to cd /.ssh/ and open known_hosts file with text editor. Remove the line starting with [localhost]:2222 and save the file. Now try to ssh again
Sometimes, if for any reason, you need to reinstall a server, when connecting by ssh we will find that you server say that the identification has changed.If we know that it is not an attack, but that we have reinstated the system, we can remove the old identification from the known_hosts using ssh-keygen:
Datalore is a web application for data analysis and visualization, which is focused specifically on the machine learning environment in Python. JetBrains Academy is an online platform to learn programming, including such programming languages as Python, Java, and Kotlin. The Academy was introduced by JetBrains in 2019, and reached 200,000 users by July 2020. Certifications were added in November 2021 after community feedback prioritized verifiability of the work done on projects. JetBrains have also developed EduTools plugin for student, this plugin is compatible with IntelliJ IDEA (Ultimate, Community, Educational), Android Studio, CLion, GoLand, PhpStorm, PyCharm (Professional, Community, Educational), WebStorm.
Note: If you have an older home machine,try the Lubuntu distribution instead.The installation and configuration directionsare virtually identical to Ubuntu.While Lubuntu is more responsive (especially on older hardware),its user interface is more primitive.
You can also connect to the SQL Edge instance on your Docker machine from any external Linux, Windows, or macOS tool that supports SQL connections. For more information on connecting to a SQL Edge container from outside, refer Connect and Query Azure SQL Edge.
Log in to your Plugin Alliance account and make sure you have an active license for the plugin you want to activate in your account. If you want to start a trial for a new plugin or activate a free plugin for the first time, go to the Create Offline License page, select the plugins you want, and click Create License. Visit the Manage Devices page, upload the machine_id.txt file in the Activate New Device section (Fig. 5), and click Activate.
Each offline computer only needs to be registered once in your Plugin Alliance account. To activate a new plugin on a device that is already registered, you can begin on the online computer and skip copying the machine_id.txt file.
Since your license data is stored remotely, there is no need to deactivate a computer or flash drive when you reformat it. Our licensing system will recognize the same machine ID as long as there were no other hardware changes and reuse the existing activation for the device.
Most UMN resources now require 2-factor authentication, includingremote access to CSE Labs machines. You will need to install the DuoApp on a mobile device to receive the verification prompts whilelogging into machines. After entering a username / password in a loginsequence, usually one will get a final prompt to use Duo to verify thelogin. Keep track of your phone for this.
CSE Labs has implemented a web-based remote desktop connection to mostLinux lab computers. This technology is referred to as \"FASTX\" andallows one to connect to lab machines graphically through a webbrowser.
Aside from individual machine access, CSE Labs provides a pool ofLinux Virtual Machines for graphical web access via its VOLEsystem. Navigate to , click the Connect toVOLE link and enter your login credentials.
VOLE currently runs on an the older FASTX2 system so may be a bitlaggier than the FASTX2 connections to individual machines. Manystudents notice see this when the system fails to respond for a shorttime or a single press of the \"x\" key results in\"xxxxxxxxxxxxxxxxxxxxxx\" showing up on their screen For these reasons,it is also good to familiar with alternatives to VOLE described later.
When working on remote machines, it is often necessary to transferfiles between a local (home) computer and the remote (lab) machines.There are a number of graphical tools to do this on all platforms:just use search terms like
This will open a file browser for your local files (those on yourpersonal machine). Select a file and confirm with \"Okay/Open\" and itwill be uploaded to the remote machine, usually to your HomeDirectory.
Some systems support a way to \"mount\" a remote machine filesystemthrough an SSH connection. The net effect of this is that copyingfiles into what looks like a local folder actually transfers them toa remote machine and copying them from that folder transfers from thatmachine. This behavior is often not present by default but isincredibly useful and has saved me countless hours of toil. You caninvestigate these for your system of choice
Once set up, an sshfs command can be issued to mount a remote folderon an empty local folder. I often use the following command to mountmy home directory on remote machine apollo.cselabs.umn.edu on alocal directory called apollo:
Visual Studio Code (VS Code) has become a popular code editor /Integrated Development Environment (IDE) that many students and staffuse. While our course has no \"official\" code editing environment,many staff members are knowledgeable about VS Code and point to itsremote code editing features/plugins as particularly useful forcourses like ours. The capability allows you to edit code on othercomputers as if it were on your local machine. While this capabilityis not unique to VS Code (and is in fact based on SSH), VS Codeprovides an easy and useful means of accessing this ability. Beloware several sets of instructions on how to do this.
It is fun and profitable to set up your own machine to compile codefor the class. While not strictly required, most students find it moreconvenient to compile and run code on their own computer rather thanrelying on remote access to other machines. The following sectionsoutline some options on how to set up a local Unix environment.
In almost all cases, compiling and running code on a Linux VM (virtualmachine) will behave identically to a \"native\" Linux. However,students, especially those on MacOS, indicate setting up VMs tobe difficult. If these paths prove difficult, consider using thezero-cost FASTX remote desktop options.
The above recommended software VirtualBox does not support the M1processor so will not work to create a compatible virtual machine. Ifyour course requires an x86-64 architecture for assembly programming(like CSCI 2021 does) then your only choice is to log into a UMNmachine that has this type of processor.
NOTE: Assembly produced by gcc will target the Windows architectureand is not likely to work on lab Linux machines where we willgrade. Make sure to verify your code works in those environments aswell.
To get a local working environment, Mac OSX users are encouraged toinstall a virtual machine software like Virtual Box and UbuntuLinux. The earlier section on Virtual Machines gives some tutorialson how to perform the install.
On logging into the machine you will work on, you will need to makesure that you get the codepack linked at the top associated with thelab and unzip it which will create a directory called lab01-codewith C files for you to analyze. To compile and run these, open aterminal and navigate to the directory lab01-code. This is usuallydone by issuing a series of \"change directory\" or cd commands as inthe following brief demo. 153554b96e