Having agent support on the local system is certainly an improvement, but many of us working remotely often must copy files from one remote system to another. Without installing and initializing an agent on the first remote system, the secure file transfer operation will require a password or passphrase every time. In a sense, this just pushes the tedium back one link down the SSH chain.
Also:My account had 2-factor authentication set up. When this is the case, if Terminal requests credentials, use your username - but NOT your Github password. For 2-factor authentication, you need to use your authentication code (for me, this was generated by Authy on my phone, and I had to copy it into Terminal for the pw).
SSH keys provide a secure way to log in to your VPS. They consist of a key pair with private key (that you must keep secure) and a public key that you copy and share with whom you want to communicate with. They will allow you to log in to your servers in a secure way without the need to use a password.
If we encrypt our data with a longer SSH key which is protected by a shorter passphrase (with a decent entropy), then the limiting factor is entropy of the passphrase. So why do we use a longer key at all? We could simply encrypt the data with the passphrase.
You're not modeling what information the attacker has. The strength of the system only reduces to that of the passphrase if the attacker has a copy of the passphrase-encrypted private key. If they don't, then the strength of the system is the strength of the private key.
Common algorithms used are RSA, ECDSA, and Ed25519, and each type has its own specifications and usable key lengths. During creation, you can specify these details and input other instructions using the right commands. Afterwards, you can continue to use Terminal to copy, modify, and delete your stored keys.
\"Tips and Tricks\" lets you jump right in and learn how to be productive with Visual Studio Code. You'll become familiar with its powerful editing, code intelligence, and source code control features and learn useful keyboard shortcuts. This topic goes pretty fast and provides a broad overview, so be sure to look at the other in-depth topics in Getting Started and the User Guide to learn more.
All of the commands are in the Command Palette with the associated key binding (if it exists). If you forget a keyboard shortcut, use the Command Palette to help you out.
Are you used to keyboard shortcuts from another editor? You can install a Keymap extension that brings the keyboard shortcuts from your favorite editor to VS Code. Go to Preferences > Migrate Keyboard Shortcuts from... to see the current list on the Marketplace. Some of the more popular ones:
The commands Copy Line Up/Down are unbound on Linux because the VS Code default keybindings would conflict with Ubuntu keybindings, see Issue #509. You can still set the commands editor.action.copyLinesUpAction and editor.action.copyLinesDownAction to your own preferred keyboard shortcuts.
In this short series of blog posts I'm going to take a look at a few very useful tools that can make your life as the sysadmin of a cluster of Linux machines easier. This may be a Hadoop cluster, or just a plain simple set of 'normal' machines on which you want to run the same commands and monitoring.
However with Ubuntu 20.04 I had set up a passphrase so that various autyomated scripts that I use using rsync could copy between cloud drives and also between Ubuntu and the cloud drive shares. This was working until I upgraded, now the scripts continually ask me for my password and I can't figure out how to stop it.
How this originally came about was that I needed to be able to rsync to and from a remote location without the need for a human intervention regarding security. The instructions I was given were to use ssh-keygen to generate public/private keys and then ssh-copy-id to copy the public key to the remote host. I've just reinstalled 20.04 on another machine and used this successfully and the rsync is working without the need for a password. However if I clear the keys on the server out, reinstall 22.04 and do the same, it still prompts me for the password. I've updated my question to show the output of the commands as they are being run on Ubuntu 22.04 with the server name obscured for obvious reasons.
SSH public key authentication is more secure than plain old passwords. The main concept is that instead of a short password, one uses a key file which is virtually impossible to guess. You give us the public part of your key and when logging in it will be used, together with the private key and username, to verify your identity.
Despite the fact that setting up an SSH connection requires a bit more work from us than the usual clone via HTTPS, it is still worth doing whenever we care about the security and protection of data in our repository. Every admin, team leader, CTO, or anyone responsible for these matters in the company should make sure that each local copy of the Git repository is only cloned with SSH key.
Explanation: If you misremember, mistype or miscopy the IP address or DNS name for your instance when you invoke the SSH client, it will try to connect to the wrong instance, or no instance at all.Symptoms: Various, depending on what is behind the (incorrect) IP address or DNS name.Diagnosis: If you are using a DNS name, perform a DNS lookup to find out what IP address it resolves to. Then use the NeCTAR Dashboard to check whether the IP address is the correct one for the instance.Solution: Figure out what the correct name / address is, and use it.
Explanation: The standard NeCTAR images are configured with \"fail2ban\" to protect against brute-force attempts to break authentication. This is recommended security practice for any system that is exposed to potential attack by hackers. Fail2ban works by temporarily \"banning\" attempts to authenticate (for example, login) if it detects more than a given number of failed login attempts from the same source in a short space of time. While the ban is in place, all login attempts will, irrespective of whether you have given the correct credentials.Symptoms: The actions performed by \"fail2ban\" are configurable, resulting in a variety of different observable symptoms. Typically you will be prompted for a password unexpectedly.Diagnosis: It is difficult to reliably diagnose this unless you can login to the instance via the console. If you can login that way, check the fail2ban logfile which is typically \"/var/log/fail2ban.log\".Solution: Wait for the ban to expire, and then try again using the correct credentials. The actual ban time is typically 10 minutes, but this is configurable as well.
Ed25519 keys are short. Very short. If you're used to copy multiple lines of characters from system to system you'll be happily surprised with the size. The public key is just about 68 characters. It's also much faster in authentication compared to secure RSA (3072+ bits).
Note the line 'Your identification has been saved in /home/gert/.ssh/id_ed25519'.Your current RSA/DSA keys are next to it in the same /.ssh folder.As with any other key you can copy the public key in /.ssh/id_ed25519.pub to target hosts for authentication.
This certificate can be used to #Revoke a key if it is ever lost or compromised. The backup will be useful if you have no longer access to the secret key and are therefore not able to generate a new revocation certificate with the above command. It is short enough to be printed out and typed in by hand if necessary.
The first step is to get hold of a local copy of the Git repositories you want to access. Duplicating a repository from a remote server is known as cloning, and you do this by pressing + on the list of repositories.
You can also import repositories by copying directories into the Files app Working Copy location. If the directory does not contain a .git subdirectory at top-level, Working Copy assumes you want a new repository with all these files added.
To copy files tap and hold to show a context menu, pick Copy, then navigate to the destination directory and press + in the upper right corner to insert File from clipboard. Move files and directories by dragging them around directory listings.
If the list is long, enter keywords in the search field in order to only see repositories containing these. If you do not see the repository you wish to clone, you can still copy-paste the clone URL into the top-field manually.
Some servers are configured to restrict secure shell to only run Git. You can enable listing repositories and creating repositories from the app by creating the directory /git-shell-commands and placing the scripts working-copy-list and working-copy-create inside.
You can commit changes to your files for the entire repository, for all files in a sub-directory or for a specific file. If you do not wish to commit some of your files you can Revert to how they where at the last commit. The files taken into account are determined by where in the directory structure you initiate the commit. As a short-hand you can swipe left on a repository, directory or file to commit.
As a general rule you should make commits with a single purpose and only include the changed files that helped achieve this purpose. You should write a message in the top line describing this purpose; if it is hard to write something short but concrete you might need to break your commit into smaller parts.