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I know I could get a list of hostnames into bash tab-completion of ssh by adding them to /etc/hosts, but since they are on DHCP, it's kinda bad practice.

Does anyone know another DHCP-aware way, that doesn't force me to interfere with Ubuntu too much?

(Global solution preferred)

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what OS is running your DHCP server? What DHCP server is being used? Do you puppet or any configuration management system? See -… – Zoredache Apr 25 '13 at 22:59
I just have clients. DHCP is managed by hoster. Puppet is too much overhead for my purposes. – arney Apr 26 '13 at 9:23

The simplest way is to simply disable the HashKnownHosts option globally or in your personal .ssh/config file. If you disable that, and also have the bash-completion package installed, then any host you connect to will be available for auto-completion after you have connected the first time.

You could use ssh-keyscan to build up a nice big list to pre-populate your known_hosts file.

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My known_hosts file is /dev/null as Keys change frequently :-( – arney Apr 25 '13 at 22:36
For auto-completion to be possible there has to be some source of data on your system that bash can use as a source. If you aren't defining your hosts anywhere on the local system you are probably out of luck. – Zoredache Apr 25 '13 at 22:57
Sure, but host id checking is just too damn naggy. Apart from that, I'd have to copy that file into every other users directory, overriding their's :-( – arney Apr 26 '13 at 9:21
up vote 1 down vote accepted

Came up with a good one myself:

sudo sh -c "echo 'Host' >> /etc/ssh/ssh_config"

works immediately and for every user :-)

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