![]() ![]() Load the new key first, without the -c option, then load one or more old keys into the agent, possibly by ssh-ing to the client machine that has that old key, using the -A option to allow agent ssh -A ssh-add -c One way of dealing with this is to load both the new key and old key(s) into your ssh-agent(1). If you have already installed keys from one system on a lot of remote hosts, and you then create a new key, on a new client machine, say, it can be difficult to keep track of which systems on which you've installed the new key. pub file to reinstate it as the most recent. The default_ID_file is the most recent file that matches: ~/.ssh/id*.pub, (excluding those that match ~/.ssh/*-cert.pub) so if you create a key that is not the one you want ssh-copy-id to use, just use touch(1) on your preferred key's. Otherwise, if ssh-add(1) provides no keys contents of the default_ID_file will be used. Note that this results in the comment on the key being the filename that was given to ssh-add(1) when the key was loaded into your ssh-agent(1) rather than the comment contained in that file, which is a bit of a shame. Rather than specifying these as command line options, it is often better to use (per-host) settings in ssh(1)'s configuration file: ssh_config(5).ĭefault behaviour without -i, is to check if ‘ ssh-add -L’ provides any output, and if so those keys are used. These two options are simply passed through untouched, along with their argument, to allow one to set the port or other ssh(1) options, respectively. Print Usage summary -p port, -o ssh_option This option is useful if the server has restrictions on commands which can be used on the remote side. With this option the user's ~/.ssh/authorized_keys file will be downloaded, modified locally and uploaded with sftp. SFTP mode: usually the public keys are installed by executing commands on the remote side. Instead of installing keys on the remote system simply prints the key(s) that would have been installed. Of course, this can result in more than one copy of the key being installed on the remote system. ![]() This means that it does not need the private key. ![]() fįorced mode: doesn't check if the keys are present on the remote server. Note that this can be used to ensure that the keys copied have the comment one prefers and/or extra options applied, by ensuring that the key file has these set as preferred before the copy is attempted. If the filename is omitted, the default_ID_file is used. Use only the key(s) contained in identity_file (rather than looking for identities via ssh-add(1) or in the default_ID_file). The options are as follows: -i identity_file It is also capable of detecting if the remote system is a NetScreen, and using its ‘ set ssh pka-dsa key. By default it adds the keys by appending them to the remote user's ~/.ssh/authorized_keys (creating the file, and directory, if necessary). It then assembles a list of those that failed to log in, and using ssh, enables logins with those keys on the remote server. It assembles a list of one or more fingerprints (as described below) and tries to log in with each key, to see if any of them are already installed (of course, if you are not using ssh-agent(1) this may result in you being repeatedly prompted for pass-phrases). Ssh-copy-id is a script that uses ssh(1) to log into a remote machine (presumably using a login password, so password authentication should be enabled, unless you've done some clever use of multiple identities). ![]()
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