94 lines
3.5 KiB
Markdown
94 lines
3.5 KiB
Markdown
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---
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description: Log into or run a command on a machine using SSH.
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keywords: machine, ssh, subcommand
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title: docker-machine ssh
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---
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Log into or run a command on a machine using SSH.
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To login, just run `docker-machine ssh machinename`:
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```bash
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$ docker-machine ssh dev
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## .
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## ## ## ==
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## ## ## ## ===
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/""""""""""""""""\___/ ===
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~~~ {~~ ~~~~ ~~~ ~~~~ ~~ ~ / ===- ~~~
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\______ o __/
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\ \ __/
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\____\______/
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_ _ ____ _ _
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| |__ ___ ___ | |_|___ \ __| | ___ ___| | _____ _ __
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| '_ \ / _ \ / _ \| __| __) / _` |/ _ \ / __| |/ / _ \ '__|
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| |_) | (_) | (_) | |_ / __/ (_| | (_) | (__| < __/ |
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|_.__/ \___/ \___/ \__|_____\__,_|\___/ \___|_|\_\___|_|
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Boot2Docker version 1.4.0, build master : 69cf398 - Fri Dec 12 01:39:42 UTC 2014
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docker@boot2docker:~$ ls /
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Users/ dev/ home/ lib/ mnt/ proc/ run/ sys/ usr/
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bin/ etc/ init linuxrc opt/ root/ sbin/ tmp var/
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```
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You can also specify commands to run remotely by appending them directly to the
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`docker-machine ssh` command, much like the regular `ssh` program works:
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```bash
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$ docker-machine ssh dev free
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total used free shared buffers
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Mem: 1023556 183136 840420 0 30920
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-/+ buffers: 152216 871340
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Swap: 1212036 0 1212036
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```
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Commands with flags work as well:
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```bash
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$ docker-machine ssh dev df -h
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Filesystem Size Used Available Use% Mounted on
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rootfs 899.6M 85.9M 813.7M 10% /
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tmpfs 899.6M 85.9M 813.7M 10% /
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tmpfs 499.8M 0 499.8M 0% /dev/shm
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/dev/sda1 18.2G 58.2M 17.2G 0% /mnt/sda1
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cgroup 499.8M 0 499.8M 0% /sys/fs/cgroup
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/dev/sda1 18.2G 58.2M 17.2G 0%
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/mnt/sda1/var/lib/docker/aufs
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```
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If you are using the "external" SSH type as detailed in the next section, you
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can include additional arguments to pass through to the `ssh` binary in the
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generated command (unless they conflict with any of the default arguments for
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the command generated by Docker Machine). For instance, the following command
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forwards port 8080 from the `default` machine to `localhost` on your host
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computer:
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```bash
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$ docker-machine ssh default -L 8080:localhost:8080
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```
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## Different types of SSH
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When Docker Machine is invoked, it checks to see if you have the venerable
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`ssh` binary around locally and attempts to use that for the SSH commands it
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needs to run, whether they are a part of an operation such as creation or have
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been requested by the user directly. If it does not find an external `ssh`
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binary locally, it defaults to using a native Go implementation from
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[crypto/ssh](https://godoc.org/golang.org/x/crypto/ssh). This is useful in
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situations where you may not have access to traditional UNIX tools, such as if
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you are using Docker Machine on Windows without having msysgit installed
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alongside of it.
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In most situations, you do not need to worry about this implementation detail
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and Docker Machine acts sensibly out of the box. However, if you
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deliberately want to use the Go native version, you can do so with a global
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command line flag / environment variable like so:
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```bash
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$ docker-machine --native-ssh ssh dev
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```
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There are some variations in behavior between the two methods, so report
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any issues or inconsistencies if you come across them.
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