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howto-ssh.md

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How To SSH

To the Jumpbox

This command shells out to ssh to initiate an interactive ssh session to the jumpbox vm.

bbl ssh --jumpbox

To the BOSH Director

This command will shell out to ssh twice. On the first invocation, it will open a tunnel forwarding a random port to the jumpbox.

On the second invocation, it initiates an interactive ssh session through that port to ssh to the director.

bbl ssh --director

To BOSH-Deployed VMs

bbl print-env prints out environment variables (BOSH_ALL_PROXY, BOSH_CLIENT, BOSH_CLIENT_SECRET, and others) that need to be exported to bosh ssh to a job vm using the bosh-cli.

Evaluating the command output sets those variables in your environment.

eval "$(bbl print-env)"
bosh ssh web/0

When you run bosh ssh web/0, the following happens:

  1. The bosh-cli parses BOSH_ALL_PROXY and determines from the ssh+socks5:// scheme that it should proxy through a jumpbox via a tunnel of its own making.

  2. The bosh-cli uses some go libraries to start a socks5 proxy on another goroutine. This socks5 proxy is backed by an ssh tunnel from your local machine to the jumpbox.

  3. The bosh-cli uses your system's openssh ssh "ProxyCommand" option and bsd nc -x to open an additional tunnel to web/0 through that socks5 proxy.

  4. When ssh exits after you ctrl-D or your ttyless command exits, the bosh-cli exits and the socks5 proxy stops with it.

For http requests to the bosh director, the bosh-cli reads BOSH_ALL_PROXY=ssh+socks5:// and uses golang's ssh.Client.Dial in the cli's http.Client to send each http request to the director through an ssh tunnel between your local machine and the jumpbox.

Troubleshooting

  • It is not necessary to set BOSH_GW_HOST and other old-style bosh ssh variables. Unset them.

  • The ubuntu stemcell allows a maximum of three login attempts, so ensure you do not have a lot of keys in your SSH keyring. ssh-add -D can clear them all.