This User Manual covers usage of the Teleport client tool
tsh. In this
document you will learn how to:
- Log into interactive shell on remote cluster nodes.
- Copy files to and from cluster nodes.
- Connect to SSH clusters behind firewalls without any open ports using SSH reverse tunnels.
- Explore a cluster and execute commands on those nodes in a cluster that match your criteria.
- Share interactive shell sessions with colleagues or join someone else's session.
- Replay recorded interactive sessions.
In addition to this document, you can always simply type
tsh into your terminal for
the CLI reference.
$ tsh usage: tsh [<flags>] <command> [<command-args> ...] Gravitational Teleport SSH tool Commands: help Show help. version Print the version ssh Run shell or execute a command on a remote SSH node join Join the active SSH session play Replay the recorded SSH session scp Secure file copy ls List remote SSH nodes clusters List available Teleport clusters login Log in to the cluster and store the session certificate to avoid login prompts logout Delete a cluster certificate # Run `tsh help <command>` to get help for <command> like `tsh help ssh`
A user identity in Teleport exists in the scope of a cluster. The member nodes of a cluster may have multiple OS users on them. A Teleport administrator assigns allowed logins to every Teleport user account.
When logging into a remote node, you will have to specify both logins. Teleport
identity will have to be passed as
--user flag, while the node login will be
[email protected], using syntax compatible with traditional
These examples assume your localhost username is 'joe':
# Authenticate against cluster 'work' as 'joe' and then login into 'node' # as root: $ tsh ssh --proxy=work.example.com --user=joe [email protected] # Authenticate against cluster 'work' as 'joe' and then login into 'node' # as joe (by default tsh uses $USER for both): $ tsh ssh --proxy=work.example.com node
tsh login log a user into a cluster and stores the user certificate
~/.tsh directory as well as in the ssh agent,
if there is one running:
$ tsh login --proxy=work.example.com
This allows you authenticate just once, maybe at the beginning of the day.
tsh ssh commands will run without asking for credentials
until the temporary certificate expires. By default Teleport issues user
certificates with a TTL (time to live) of 23 hours.
It is recommended to always use
tsh login before using any other
This allows users to omit
--proxy flag in subsequent tsh commands. For example
tsh ssh [email protected] will work.
SSH Agent Support
If there is an ssh agent running,
tsh login will store the user certificate in the agent.
This can be verified via:
$ ssh-add -L
SSH agent can be used to feed the certificate to other SSH clients, for example
tsh login can also save the user certificate into a file:
# Authenticate user against proxy.example.com and save the user # certificate into joe.pem file $ tsh login --proxy=proxy.example.com --out=joe # Use joe.pem to login into a server 'db' $ tsh ssh --proxy=proxy.example.com -i joe [email protected]
--out flag will create an identity file suitable for
tsh -i but
if compatibility with OpenSSH is needed,
--format=openssh must be specified.
In this case the identity will be saved into two files:
$ tsh login --proxy=proxy.example.com --out=joe --format=openssh $ ls -lh total 8.0K -rw------- 1 joe staff 1.7K Aug 10 16:16 joe -rw------- 1 joe staff 1.5K Aug 10 16:16 joe-cert.pub
SSH Certificates for Automation
Regular users of Teleport must request an auto-expiring SSH certificate, usually every day. This doesn't work for non-intractive scripts, like cron jobs or CI/CD pipeline.
For such automation, it is recommended to create a separate Teleport user for bots and request a certificate for them with a long time to live (TTL).
In this example we're creating a certificate with a TTL of 10 years for the
jenkins user and storing it in jenkins.pem file, which can be later used with
-i (identity) flag for
# to be executed on a Teleport auth server $ tctl auth sign --ttl=87600h --user=jenkins --out=jenkins.pem
jenkins.pem can be copied to the jenkins server and passed to
(identity file) flag of
tctl auth sign is an admin's
tsh login --out and allows for unrestricted certificate TTL
Exploring the Cluster
In a Teleport cluster all nodes periodically ping the cluster's auth server and
update their status. This allows Teleport users to see which nodes are online with the
tsh ls command:
# This command lists all nodes in the cluster which you previously logged in via "tsh login": $ tsh ls # Output: Node Name Node ID Address Labels --------- ------- ------- ------ turing 11111111-dddd-4132 10.1.0.5:3022 os:linux turing 22222222-cccc-8274 10.1.0.6:3022 os:linux graviton 33333333-aaaa-1284 10.1.0.7:3022 os:osx
tsh ls can apply a filter based on the node labels.
# only show nodes with os label set to 'osx': $ tsh ls os=osx Node Name Node ID Address Labels --------- ------- ------- ------ graviton 33333333-aaaa-1284 10.1.0.7:3022 os:osx
To launch an interactive shell on a remote node or to execute a command, use
$ tsh ssh --help usage: t ssh [<flags>] <[[email protected]]host> [<command>...] Run shell or execute a command on a remote SSH node. Flags: --user SSH proxy user [alice] --proxy SSH proxy host or IP address, for example --proxy=host:ssh_port,https_port --ttl Minutes to live for a SSH session --insecure Do not verify server certificate and host name. Use only in test environments -d, --debug Verbose logging to stdout -p, --port SSH port on a remote host -l, --login Remote host login -L, --forward Forward localhost connections to remote server --local Execute command on localhost after connecting to SSH node Args: <[[email protected]]host> Remote hostname and the login to use [<command>] Command to execute on a remote host
tsh tries to mimic the
ssh experience as much as possible, so it supports the most popular
-L. For example if you have the following alias defined in your
alias ssh="tsh --proxy=work.example.com --user=myname" then you can continue
using familiar SSH syntax:
$ ssh [email protected] $ ssh -p 6122 [email protected] ls
A Teleport proxy uses two ports:
3080 for HTTPS and
3023 for proxying SSH connections.
The HTTPS port is used to serve Web UI and also to implement 2nd factor auth for
If a Teleport proxy is configured to listen on non-default ports, they must be specified
--proxy flag as shown:
This means use port
5000 for HTTPS and
5001 for SSH
tsh ssh supports OpenSSH
-L flag which allows forwarding incoming connections from localhost
to the specified remote host:port. The syntax of
-L flag is:
where "bind_ip" defaults to
$ tsh ssh -L 5000:web.remote:80 node
Will connect to remote server
proxy.example.com, then it will open
a listening socket on
localhost:5000 and will forward all incoming connections
web.remote:80 via this SSH tunnel.
It is often convenient to establish port forwarding, execute a local command which uses such
connection and disconnect. You can do this via
$ tsh ssh -L 5000:google.com:80 --local node curl http://localhost:5000
- Connects to
- Binds the local port 5000 to port 80 on google.com
curlcommand locally, which results in
curlhitting google.com:80 via
Resolving Node Names
tsh supports multiple methods to resolve remote node names.
- Traditional: by IP address or via DNS.
- Nodename setting: teleport daemon supports
nodenameflag, which allows Teleport administrators to assign alternative node names.
- Labels: you can address a node by
In the example above, we have two nodes with
os:linux label and one node with
Lets login into the OSX node:
$ tsh ssh os=osx
This only works if there is only one remote node with
os:osx label, but you can still execute
commands via SSH on multiple nodes using labels as a selector. This command will update all
system packages on machines that run Linux:
$ tsh ssh os=ubuntu apt-get update -y
Suppose you are borrowing someone else's computer to login into a cluster. You probably don't
want to stay authenticated on this computer for 23 hours (Teleport default). This is where the
flag can help.
This command logs you into the cluster with a very short-lived (1 minute) temporary certificate:
$ tsh --ttl=1 login
You will be logged out after one minute, but if you want to log out immediately, you can always do:
$ tsh logout
To securely copy files to and from cluster nodes use
tsh scp command. It is designed to mimic
scp as much as possible:
$ tsh scp --help usage: tsh scp [<flags>] <from, to>... Secure file copy Flags: --user SSH proxy user [alice] --proxy SSH proxy host or IP address --ttl Minutes to live for a SSH session --insecure Do not verify server certificate and host name. Use only in test environments -P, --debug Verbose logging to stdout -d, --debug Verbose logging to stdout -r, --recursive Recursive copy of subdirectories Args: <from, to> Source and the destination
$ tsh scp example.txt [email protected]:/path/to/dest
Again, you may want to create a bash alias like
alias scp="tsh --proxy=work scp" and use
the familiar sytanx:
$ scp -P 61122 -r files [email protected]:/path/to/dest
Suppose you are trying to troubleshoot a problem on a remote server. Sometimes it makes sense
to ask another team member for help. Traditionally this could be done by letting them know which
node you're on, having them SSH in, start a terminal multiplexer like
screen and join a
Teleport makes this a bit more convenient. Let's log into "luna" and ask Teleport for your current session status:
$ tsh ssh luna >luna $ teleport status User ID : joe, logged in as joe from 10.0.10.1 43026 3022 Session ID : 7645d523-60cb-436d-b732-99c5df14b7c4 Session URL: https://work:3080/web/sessions/7645d523-60cb-436d-b732-99c5df14b7c4
Now you can invite another user account in the "work" cluster. You can share the URL for access through a web browser. Or you can share the session ID and she can join you through her terminal by typing:
$ tsh join 7645d523-60cb-436d-b732-99c5df14b7c4
Connecting to SSH Clusters behind Firewalls
Teleport supports creating clusters of servers located behind firewalls without any open listening TCP ports. This works by creating reverse SSH tunnels from behind-firewall environments into a Teleport proxy you have access to. This feature is called "Trusted Clusters".
This chapter explains how to a user may connect to a trusted cluster. Refer to the admin manual to learn how a trusted cluster can be configured.
Assuming the "work" Teleport proxy server is configured with a few trusted
clusters, a user may use
tsh clusters command to see a list of them:
$ tsh --proxy=work clusters Cluster Name Status ------------ ------ staging online production offline
Now you can use
--cluster flag with any
tsh command. For example, to list SSH nodes that
are members of "production" cluster, simply do:
$ tsh --proxy=work --cluster=production ls Node Name Node ID Address Labels --------- ------- ------- ------ db-1 xxxxxxxxx 10.0.20.31:3022 kernel:4.4 db-2 xxxxxxxxx 10.0.20.41:3022 kernel:4.2
Similarly, if you want to SSH into
db-1 inside "production" cluster:
$ tsh --proxy=work --cluster=production ssh db-1
This is possible even if nodes of the "production" cluster are located behind a firewall without open ports. This works because "production" cluster establishes a reverse SSH tunnel back into "work" proxy, and this tunnels is used to establish inbound SSH connections.
Teleport proxy serves the web UI on
https://proxyhost:3080. The UI allows you to see the list of
online nodes in a cluster, open web-based Terminal to them, see recorded sessions and replay them.
You can also join other users via active sessions.
You can copy & paste using the mouse. For working with a keyboard, Teleport employs
"prefix" mode. To enter prefix mode, press
While in prefix mode, you can press
Ctrl+V to paste, or enter text selection mode by pressing
When in text selection mode, move around using
hjkl, select text by toggling
space and copy
Using OpenSSH Client
There are a few differences between Teleport's
tsh and OpenSSH's
ssh but most
of them can be made completely invisible.
tshneeds to know which cluster you are connecting to. But if you execute
tsh --proxy=xxx login, the current proxy will be saved in your
~/.tshprofile and won't be needed for other
tsh sshoperates two usernames: one for the cluster and another for the node you are trying to login into. See User Identities section below. For convenience,
$USERfor both by default. But again, if you use
tsh ssh, your Teleport username will be stored in
To avoid typing
tsh ssh [email protected] when loggin inton servers, you can
create a symlink
ssh -> tsh and execute the symlink. It will behave exactly
like a standard
ssh command, i.e.
ssh [email protected]. This is helpful with other
tools that expect
ssh to just work.
Teleport is built using standard SSH constructs: keys, certificates, protocols. This means that a Teleport system is 100% compatible with both OpenSSH clients and servers.
For OpenSSH client (
ssh) to work with a Teleport proxy, two conditions must be met:
sshmust be configured to connect via a Teleport proxy.
sshneeds to be given the SSH certificate issued by
SSH Proxy Configuration
ssh to use a Teleport proxy on
proxy.example.com, a user must
~/.ssh/config. A few examples are shown below:
# When "ssh db" is executed, OpenSSH will connect to proxy.example.com on port 3023 # and will request a proxied connection to "db" on port 3022 (default Teleport SSH port) Host db Port 3022 ProxyCommand ssh -p 3023 %[email protected] -s proxy:%h:%p # When connecting to a node behind a trusted cluster named "remote-cluster", # the name of the trusted cluster must be appended to the proxy subsystem # after '@': Host *.trusted-cluster.example.com Port 3022 ProxyCommand ssh -p 3023 %[email protected] -s proxy:%h:%[email protected]
The configuration above is all one will need to
ssh [email protected] if there's an
SSH agent running on a client computer. You can verify it by executing
tsh login. If the SSH agent is running the cluster certificates will
be printed to stdout.
If there is no ssh-agent available, the certificate must be passed to the OpenSSH client explicitly.
Passing Teleport SSH Certificate to OpenSSH Client
If a user does not want to use an SSH agent or if the agent is not available, the certificate
must be passed to
IdentityFile option (see
man ssh_config). Consider this example:
the Teleport user "joe" wants to login into the proxy named "lab.example.com".
tsh login command:
$ tsh --proxy=lab.example.com login --user=joe
His identity is now stored in
~/.tsh/keys/lab.example.com, so his
~/.ssh/config needs to look like this:
# ~/.ssh/config file: Host *.lab.example.com Port 3022 IdentityFile ~/.tsh/keys/lab.example.com/joe ProxyCommand ssh -i ~/.tsh/keys/lab.example.com/joe -p 3023 %[email protected] -s proxy:%h:%p
Now he can SSH into any machine behind
lab.example.com using the OpenSSH client:
$ ssh jenkins.lab.example.com
If you encounter strange behaviour, you may want to try to solve it by enabling
the verbose logging by specifying
-d flag when launching
Also you may want to reset it to a clean state by deleting temporary keys and
other data from