How to ssh to vagrant without actually running "vagrant ssh"?

I've had to re-implement "vagrant ssh" because it's -c option didn't pass on arguments properly. This is basically what it does (there might be more, but it works fine this way)

#!/bin/sh
PORT=$(vagrant ssh-config | grep Port | grep -o '[0-9]\+')
ssh -q \
    -o UserKnownHostsFile=/dev/null \
    -o StrictHostKeyChecking=no \
    -i ~/.vagrant.d/insecure_private_key \
    vagrant@localhost \
    -p $PORT \
    "$@"

As a one-liner (with thanks to kgadek):

ssh $(vagrant ssh-config | awk 'NR>1 {print " -o "$1"="$2}') localhost

To account for when you have more than one vagrant host, this will select the desired host, as well as cull blank lines from the config (using sed):

HOST=name-of-my-host
ssh $(vagrant ssh-config $HOST | sed '/^[[:space:]]*$/d' |  awk 'NR>1 {print " -o "$1"="$2}') localhost

Just pass the entire vagrant ssh-config as a config file to ssh with the -F configfile parameter. The host alias to connect to is defined on the first line in vagrant ssh-config; Host default means you can connect with ssh default.

I couldn't see an option to read the config file from the standard input, so went with the temp file route. Here's a one-liner that also cleans up the temporary $TMPDIR.vagrant-ssh-config file afterwards. It needs to be executed in the same directory as your Vagrantfile, assuming you vagrant box is up and running.

vagrant ssh-config > $TMPDIR.vagrant-ssh-config && ssh default -F $TMPDIR.vagrant-ssh-config ; rm $TMPDIR.vagrant-ssh-config

Note: on my Mac OSX system, $TMPDIR expands to /var/folders/46/yltlhtgx8m5cg68_w95wgvy41324gn/T/ (right now). Use another variable, or another folder, if it's not set on your system.

There's a lot of answers already, but they all seem overly complicated or solve problems the asker didn't have.

simply:

# save the config to a file
vagrant ssh-config > vagrant-ssh

# run ssh with the file.
ssh -F vagrant-ssh default

In terminal run

vagrant ssh

In another terminal window/tab run

ps aux | grep ssh

There you will see the actual command executed by Vagrant, something like this:

ssh [email protected] -p 2222 -o Compression=yes -o DSAAuthentication=yes -o LogLevel=FATAL -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o IdentitiesOnly=yes -i ~/.vagrant.d/less_insecure_private_key -o ForwardAgent=yes