SSH connection multiplexing: execute commands simultaneously on multiple hosts via SSH
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lib/net/ssh
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README.rdoc
Rakefile
gem-public_cert.pem
net-ssh-multi.gemspec

README.rdoc

Net::SSH::Multi

As of v1.1.1, all gem releases are signed. See INSTALL.

DESCRIPTION:

Net::SSH::Multi is a library for controlling multiple Net::SSH connections via a single interface. It exposes an API similar to that of Net::SSH::Connection::Session and Net::SSH::Connection::Channel, making it simpler to adapt programs designed for single connections to be used with multiple connections.

This library is particularly useful for automating repetitive tasks that must be performed on multiple machines. It executes the commands in parallel, and allows commands to be executed on subsets of servers (defined by groups).

FEATURES:

  • Easily manage multiple connections

  • Open channels, spawn processes, etc. on multiple connections in parallel

  • Transparently limit concurrent connections when dealing with large numbers of servers (Net::SSH::Multi::Session#concurrent_connections)

  • Specify a default gateway machine through which connections should be tunneled, or even specify a different gateway machine for each server

SYNOPSIS:

In a nutshell:

require 'net/ssh/multi'

Net::SSH::Multi.start do |session|
  # access servers via a gateway
  session.via 'gateway', 'gateway-user'

  # define the servers we want to use
  session.use 'user1@host1'
  session.use 'user2@host2'

  # define servers in groups for more granular access
  session.group :app do
    session.use 'user@app1'
    session.use 'user@app2'
  end

  # execute commands on all servers
  session.exec "uptime"

  # execute commands on a subset of servers
  session.with(:app).exec "hostname"

  # run the aggregated event loop
  session.loop
end

See Net::SSH::Multi::Session for more documentation.

REQUIREMENTS:

  • net-ssh (version 2)

  • net-ssh-gateway

If you want to run the tests or use any of the Rake tasks, you'll need:

  • Echoe (for the Rakefile)

  • Mocha (for the tests)

INSTALL:

  • gem install net-ssh-multi

However, in order to be sure the code you're installing hasn't been tampered with, it's recommended that you verify the signature. To do this, you need to add my public key as a trusted certificate (you only need to do this once):

# Add the public key as a trusted certificate
# (You only need to do this once)
$ curl -O https://raw.github.com/net-ssh/net-ssh/master/gem-public_cert.pem
$ gem cert --add gem-public_cert.pem

Then, when install the gem, do so with high security:

$ gem install net-ssh-multi -P HighSecurity

If you don't add the public key, you'll see an error like “Couldn't verify data signature”. If you're still having trouble let me know and I'll give you a hand.

LICENSE:

(The MIT License)

Copyright © 2008 Jamis Buck <jamis@37signals.com>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.