Can't juju ssh to one of my units

[Samuel Cozannet]

Hi Derek,

You need to upgrade your Juju to 2.0.3 at least. This is a known issue (I
am all thumbs so can't find the LP ref right now but there are a bunch of
tickets about it)

To do so, first upgrade your controller:

sudo apt update && sudo apt upgrade
juju switch controller
juju upgrade-juju

Then upgrade units of the model

juju switch <model>
juju upgrade-juju

If this doesn't work out for you, I had success with upgrading a controller
to 2.1-beta5 by adding the devel ppa, upgrading locally, upgrading the
controller, then the units.


Let us know how it gets for you,
Best
Sam

On Feb 13, 2017 21:52, "Derek DeMoss" <derekd at darkhorse.com> wrote:

> Hey All,
> I'm getting a host key verification failure when I try to juju ssh to one
> of my units.
>
> username at os-nuc-01:~/.ssh$ juju ssh  postgresql/14 -v
> OpenSSH_7.2p2 Ubuntu-4ubuntu2.1, OpenSSL 1.0.2g  1 Mar 2016
> debug1: Reading configuration data /etc/ssh/ssh_config
> debug1: /etc/ssh/ssh_config line 19: Applying options for *
> debug1: Connecting to <ip address> [<ip address>] port 22.
> debug1: Connection established.
> debug1: identity file /home/username/.local/share/juju/ssh/juju_id_rsa
> type 1
> debug1: key_load_public: No such file or directory
> debug1: identity file /home/username/.local/share/juju/ssh/juju_id_rsa-cert
> type -1
> debug1: identity file /home/username/.ssh/id_rsa type 1
> debug1: key_load_public: No such file or directory
> debug1: identity file /home/username/.ssh/id_rsa-cert type -1
> debug1: Enabling compatibility mode for protocol 2.0
> debug1: Local version string SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.1
> debug1: Remote protocol version 2.0, remote software version OpenSSH_7.2p2
> Ubuntu-4ubuntu2.1
> debug1: match: OpenSSH_7.2p2 Ubuntu-4ubuntu2.1 pat OpenSSH* compat
> 0x04000000
> debug1: Authenticating to <ip address>:22 as 'ubuntu'
> debug1: SSH2_MSG_KEXINIT sent
> debug1: SSH2_MSG_KEXINIT received
> debug1: kex: algorithm: curve25519-sha256 at libssh.org
> debug1: kex: host key algorithm: ecdsa-sha2-nistp256
> debug1: kex: server->client cipher: chacha20-poly1305 at openssh.com MAC:
> <implicit> compression: none
> debug1: kex: client->server cipher: chacha20-poly1305 at openssh.com MAC:
> <implicit> compression: none
> debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
> debug1: Server host key: ecdsa-sha2-nistp256 SHA256:
> th86nMHQbr0RyuXXnsrBbeOs2JkchFl6gXVBY7p6S2k
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
> Someone could be eavesdropping on you right now (man-in-the-middle attack)!
> It is also possible that a host key has just been changed.
> The fingerprint for the ECDSA key sent by the remote host is
> SHA256:th86nMHQbr0RyuXXnsrBbeOs2JkchFl6gXVBY7p6S2k.
> Please contact your system administrator.
> Add correct host key in /tmp/ssh_known_hosts736182584 to get rid of this
> message.
> Offending RSA key in /tmp/ssh_known_hosts736182584:7
>   remove with:
>   ssh-keygen -f "/tmp/ssh_known_hosts736182584" -R <ip address>
> ECDSA host key for <ip address> has changed and you have requested strict
> checking.
> Host key verification failed.
>
>
> If I just do: ssh ubuntu@<unit ip address> it connects just fine.
>
> So my question is, where is Juju getting the original for
> /tmp/ssh_known_hosts736182584:7
>
> I've tried searching a bunch on my juju-controller machine, but I haven't
> been able to find anything that looks like the problematic known_hosts
> file...
>
> All the other machines/units are juju ssh-able, and I have no idea why
> this one would be different [other than the drive filled up from
> postgresql, and I had to clear some WAL files before things got running
> again].
>
> Any insight or help would be appreciated!
> Derek DeMoss
> Dark Horse Comics, Inc.
> System Administrator I
> "Truth...  Is where you seek it."-Lomar
>
>
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