client = Etcd.client # this will create a client against etcd server running on localhost on port 4001
client = Etcd.client(port: 4002)
client = Etcd.client(host: '127.0.0.1', port: 4003)
client = Etcd.client(:user_name => 'test', :password => 'pwd') # populates the authentication header for basic HTTP auth with user name and password (useful for proxied connections)
client = Etcd.client(host: '127.0.0.1', port: 4003, allow_redirect: false) # wont let you run sensitive commands on non-leader machines, default is true

client=Etcd.client(
  :host => "your-etcd-host",
  :port => 443,
  :use_ssl => true,
  :ca_file => "/pathto/myca.crt",
  :ssl_cert => OpenSSL::X509::Certificate.new( File.read("/pathto/my-cert.crt") ),
  :ssl_key => OpenSSL::PKey::RSA.new("/etc/ssl/my-cert.key",passphrase)
)
#Omit passphrase if not set on your key.

client.set('/nodes/n1', value: 1)
# with ttl
client.set('/nodes/n2', value: 2, ttl: 4)  # sets the ttl to 4 seconds

client.get('/nodes/n2').value

client.delete('/nodes/n1')
client.delete('/nodes/', recursive: true)

client.test_and_set('/nodes/n2', value: 2, prevValue: 4) # will set /nodes/n2 's value to 2 only if its previous value was 4

client.watch('/nodes/n1') # will wait till the key is changed, and return once its changed

client.get('/nodes')

client.machines

client.leader