When spinning up a linux virtual machine, I have chosen the authentication type as password. Now I want to change to ssh. How to achieve this?
Thanks
You can use Azure portal to reset password, like this:
If you want to change authentication type, you can follow this steps:
1. Create an SSH key pair
ssh-keygen -t rsa -b 2048
2. rename id_rsa.put to authorized_keys
mv /home/user/.ssh/id_rsa.pub /home/user/.ssh/authorized_keys
3.Copy id_rsa to your local, then you can use this key to SSH it.
Related
I have Linux VM on Azure which at first set without SSH keys. which means authentication is made only with password via SSH. I would like to change it now. I tried the way I know, I can login with the keys - but still login with password.
What else did I miss? There is something else?
Thanks
Tried to configure SSH key, disable the 'passwordauthentication'
Change ssh config
Add key via azure portal
Try to following these steps -
Login to your existing azure VM using passwords authentication.
Create new ssh key pair.
ssh-keygen -t rsa -b 2048
Replace ~/.ssh/authorized_keys with ~/.ssh/id_rsa.pub key
mv ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys
Save ~/.ssh/id_rsa public key to your local system.
Edit /etc/ssh/sshd_config and make following changes
Change PasswordAuthentication to this:
PasswordAuthentication no
Change PubkeyAuthentication to this:
PubkeyAuthentication yes
Change PermitRootLogin to this:
PermitRootLogin no
Change ChallengeResponseAuthentication to this:
ChallengeResponseAuthentication no
Restart the vm using following command
sudo systemctl restart ssh
I tried to reproduce the same in my environment and got the results like below:
I have created Linux VM on Azure first set without SSH keys only with password via SSH then I tried to authentication to ssh key like below:
Create SSH key pair:
ssh-keygen -t rsa -b 2048
Then, use /home/<user>/.ssh/id_rsa.pub
Enter passphrase: Give your password
Once you enter password RSA will executed successfully like below:
Then try to move to id_rsa to authorized using below script:
`mv/home/<user>/.ssh/id_rsa.pub/home/<user>/.ssh/authorized_keys`
when I run this cmd cat id_rsa I got public key successfully like below
I agree with schine som And save public key open config file with vi and try restart like below:
PasswordAuthentication no
PubkeyAuthentication yes
PermitRootLogin no
ChallengeResponseAuthentication no
I've created a server on Digital Ocean and made a keypair for connection over ssh for the root user. Now it wants me to create a keypair for the new regular user I've created. What is the normal practice for naming these keys and how do I use them so the system knows which keys to use when I'm signing in to each account?
Name them however you wish to remember them; typically by user. Use the identify file option when you connect.
To connect with a file:
ssh -i /path/to/key.pem user#host
To generate a new file and save it somewhere
ssh-keygen -f /path/to/file
See man ssh && man ssh-keygen
See: https://www.freebsd.org/cgi/man.cgi?query=ssh&sektion=1
See: https://linux.die.net/man/1/ssh-keygen
i need to make passwordless login for same linux server with same user.
[airwide#eir ~]$ hostname -i
10.3.7.73
[airwide#eir ~]$ ssh airwide#10.3.7.73
airwide#10.3.7.73's password:
how can make to passwordless for same server?
Password-free login via SSH is managed using SSH keys. You can generate a keypair using the command ssh-keygen. The ssh keypair is usually stored in ~/.ssh in a pair of files named id_rsa and id_rsa.pub. When you use SSH to connect to a server, the SSH command will look for a private key in ~/.ssh/id_rsa, and will attempt to authenticate using that key. In order to authorize the key, you will need to place the public key into your authorized_keys file:
`cat ~/./ssh/id_rsa.pub >> ~/.ssh/authorized_keys`
Once you've done that, you will be able to use SSH to connect without a password from the server where the id_rsa file is to the server that has the content of id_rsa.pub in its authorized_keys file. (You can do this for same-server, as in your question, or between multiple servers. Either way, it's the same process.)
Add server's private key in known host key under .ssh folder.
You are looking for ssh keys. You can create one by entering ssh-keygen. This wil create a public key and a private key. You place the public key on the remote server, and then you can use SSH without a password.
More details, and howto:
https://wiki.archlinux.org/index.php/SSH_keys
I'm writing a cron job that uses rsync and ssh to sync things up, but the problem is, rsync requires password when connecting to the remote server. i need to save the rsync ssh password, so it can keep syncing without asking for the password. Is there any way to do that? or is it just impossible?
Use Generate the authentication key
http://www.debian-administration.org/article/SSH_with_authentication_key_instead_of_password
You can follow these steps to get your task done. Use commands mentioned below.
Step 1) You can use ssh-keygen -t rsa to generate RSA public key.
Step 2) ssh-copy-id -i /root/.ssh/id_rsa.pub user#destination_IP_address
( This copies the public key to remote machine , now your local machine knows your remote machine.)
( Note: make sure you are using appropriate "user" across machines. )
How do you setup server to server SFTP to use public-key authentication instead of user account and password?
In the client you need to generate its public key and add it to server's authorized key list.
The following are the commands you can use.
On client machine
ssh-keygen -t dsa -f id_dsa
mv id_dsa* ~/.ssh/
scp ~/.ssh/id_dsa.pub USER_NAME#SERVER:~/.ssh/HOST_NAME.key
On the server
cat ~/.ssh/HOST_NAME.key >> ~/.ssh/authorized_keys2
Remember to
chmod 700 .ssh
and also
chmod 600 authorized_keys
This is a solution for windows users
I had a similar issue on windows so I used Putty from http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html
If you need to generate a public key then use:
http://the.earth.li/~sgtatham/putty/latest/x86/puttygen.exe
Then, when you want to automate a batch to download from the FTP server the Pageant in order to load the private key into session
http://the.earth.li/~sgtatham/putty/latest/x86/pageant.exe
Then use the PSFTP to connect and perform actions
http://the.earth.li/~sgtatham/putty/latest/x86/psftp.exe
So here is sample code for the batch:
!--Loading the key to session--!
#C:\pageant.exe "C:\privatekey.ppk"
!--Calling the PSFTP.exe with the uaser and sftp address + command list file--!
#C:\psftp user#your.server.address -b C:\sftp_cmd.txt
Command list file (sftp_cmd.txt) will like like this:
mget "*.*" !--downloading every thing
!--more commands can follow here
close
Now, all you need to to schedule it in scheduled tasks
*I wish it was simple as unix's cron job....