ClusterSSH Setup with Teleport

[stevenGravy]

A question we sometimes get is around using ClusterSSH, a tool that allows for opening and issuing commands to multiple ssh sessions at once. Using with Teleport is essentially just configuring to enable usage with the openssh ssh client. Here I will give an example to configure for nodes. The nodes hostnames follow the *.teleport.example.com pattern.

Prerequisites:

• cssh already installed
• SSH nodes available to connect to with the same userid

Step 1. Configure ~/.ssh/config

Host teleport.example.com
   HostName teleport.example.com
   StrictHostKeyChecking no
   Port 3023
Host *.teleport.example.com
   StrictHostKeyChecking no
   HostName %h
   Port 3022
   ProxyCommand ssh -p 3023 %r@example.teleport.com -s proxy:%h:%p

Step 2. Confirm access via ssh client to a server

# run ssh-agent
 eval `ssh-agent`
# login to teleport
tsh login ...

#confirm access to a teleport.example.com server via ssh
ssh root@myserver1.teleport.example.com

Step 3. Configure ClusterSSH

Configure the relevant servers within the .clusterss/config file.
Ex: .clusterssh/config

clusters = myservers
myservers = myserver1.teleport.example.com myserver2.teleport.example.com myserver3.teleport.example.com myserver4.teleport.example.com
user = myuser

Step 4 Connect

Running this command would open 4 terminal sessions at once connected via Teleport.
cssh myservers