# ssh root@192.168.122.96 root@192.168.122.96’s password: Permission denied, please try again. Do according to [1]. NOTE: on Ubuntu, remember to restart ssh service like this “sudo restart ssh”. [1] https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/v2v_guide/preparation_before_the_p2v_migration-enable_root_login_over_ssh Answered by harryxiyou.
Posts tagged SSH
87 posts in total.
How can I login without password and run command in server at a local machine remotely?
Login without PWD is fast and efficient. Running commands in server from local machine also have these benefits. login without PWD: add PC A’s public key to PC B’s authorized keys. > a@A:~> cat .ssh/id_rsa.pub | ssh b@B ‘cat >> .ssh/authorized_keys’ > b@B’s password: Run command remotely ssh root@MachineB “ls” NOTE: running commands remotely is […]
How to use vnc to connect remote server with GUI desktop
For my case, I need to bypass one intermediate server so that I can connect to the remote server with vnc. For example, there are two servers (s1, s2) except my local PC and I have to login to s1 so that I can login s2 from my local PC. However, now, I need to […]
How to get the IP addresses of VMs in KVM with virsh
When we create VMs in KVM, we may don’t know the IP addresses because they are automatically assigned by DHCP. So we want to get them in VMM so that can login by SSH. Do the commands as follows. $ virsh domiflist hvm1 Interface Type Source Model MAC ——————————————————- vnet0 network default virtio 52:54:00:1c:36:cd $ […]
How to choose the key used by SSH for a specific host?
How to choose a key used rather than the default ~/.ssh/id_rsa when ssh to a remote server for a specific host? You have at least 2 choices for choosing the key used by ssh. Taking ~/.ssh/key1 and user@example.com as the example here. Method one, specify the key in command line with the -i option of […]
Which ssh client on iOS works the best for socks?
There are good ssh clients on Windows and, needless to mention, Linux. But which ssh client on iOS for iPhone/iPad works the best for socks? You may try vSSH. It is the best SSH client app I found on iOS. vSSH supports tunneling/port forwarding: you can setup port tunneling in the “Port forwarding” section of […]
How to make lftp to use key for authentication for sftp on Linux?
I have successfully enabled password-less ssh login to a remote server, say example.com with username user. But when I use lftp to log on the sftp by lftp sftp://user@example.com it still asks my password. How it make lftp use my private key to logon the remote lftp server? There is a little trick to make […]
How to scp multiple files from remote to local on Linux?
With scp, copying several files such as file1 file2 to remote site can be passed by command line like $ scp file1 file2 user@remote: But how to scp multiple files from remote to local on Linux? You can do similar things by at least 2 method with scp: $ scp user@remote:file{1,2} ./ $ scp user@remote:”file1 […]
Why does ; after & lead to unexpected token error in bash on Linux?
The command using ‘;’ after ‘&’ like ssh host1 hostname &; ssh host2 hostname & Leads to error like bash: syntax error near unexpected token `;’ Why does ; after & lead to unexpected token error in bash on Linux? And what’s the solution? The fix The quick fix is to change your command to […]
How to manually kill HDFS DataNodes?
stop-dfs.sh report that there are no datanodes running on some nodes like hdfs-node-000208: no datanode to stop However, there are DataNode process running there. How to clean these processes on many (100s) of nodes? You may use this piece of bash script: for i in `cat hadoop/etc/hadoop/slaves`; do echo $i; ssh $i ‘jps | grep […]
How to force ssh client to authenticate using password on Linux?
ssh client can use many authentication methods like password, keys. On a server, I set password-less log in with private/public key. Now, I want to try whether the new password is set correctly by log on using ssh. By default, the key-based authentication method is used again. How to force ssh client to authenticate using […]
How to enable SSH service on Fedora Linux?
How to enable SSH service on Fedora Linux? By default, it seems ssh is not enabled. Fedora may not have sshd service installed/enabled by default. You will need to install and configure it by yourself. The following instructions is for Fedora 22 as an example. First, install the sshd server by # dnf install openssh-server […]
How to Passwordless SSH to an OpenWrt Router?
The good ssh-copy-id method which works well on common Linux seems not working for OpenWrt router. How to Passwordless SSH to an OpenWrt Router? OpenWrt’s SSH server is Dropbear. It can accept normal RSA keys. But the authorized_keys location is not the same as the openssh “~/.ssh/authorized_keys”. The location for the authorized_keys is /etc/dropbear/authorized_keys What […]
How to disable SSH reverse DNS lookup on Linux?
How to disable the reverse DNS lookup by the SSD server on Linux? To turn off reverse DNS lookups of the SSH daemon, log on the server and add UseDNS no to /etc/ssh/sshd_config. And remember to restart the sshd service by service sshd restart or systemctl restart sshd.service or other commands depending on your system. […]
How to limit the network rate used by scp in Linux?
I am using a shared network and scp to upload files. I do not want to use most of the bandwidth available. How to limit the network rate used by scp in Linux? You can use the -l option of scp to limit the rate of bandwidth. -l limit Limits the used bandwidth, specified in […]
Any good Web browser in command line in Linux?
What suggested web browser in command line? This will be very useful for browsing the Internet from a command line via SSH. You may use Lynx, a fully-featured World Wide Web (WWW) client for users running cursor-addressable, character-cell display devices, in Linux. Homepage: http://lynx.isc.org/ Lynx is a fully-featured World Wide Web (WWW) client for users […]
How to check whether a USB disk is connected to a Linux server?
I can only connect to a Linux server by SSH. How to check whether a USB disk is connected to the Linux server? 2 ways I usuaully use: Method One: Check the print out of dmesg After the USB storage is connected and detected by Linux, it may print some messages containing “[sde]” (the new […]
How to email admins automatically after a Linux server starts?
Managing a cluster of servers, I would like to notified when a server is started. How to make the Linux servers email me or other admins automatically after they are started? I did this by adding a crontab entry on each servers like @reboot date | mailx -S smtp=smtp://smtp.example.com -s “`hostname` started” -r zma@example.com zma@example.com […]
How to make Linux automatically reboot after a kernel panic?
After a kernel panic, it is impossible to remotely connect to the Linux server to reboot it by SSH. How to make the panic kernel automatically reboot itself? Linux kernel has a nice feature that reboots itself after a timeout when a kernel panic happened. Usually, it is disabled by default. To turn it on, […]
Basic iptables configuration for Linux
What is a good basic iptables config? Basic rules needed: Allow incoming TCP to 22 for SSH but blocks all others. Allow outgoing TCP/UDP connections. You may consider using the following rules as a start: for tables in iptables ip6tables ; do # Flush existing rules $tables -F # Default policy $tables -P INPUT DROP […]
