working version

lib/routers.rb

@@ -4,7 +4,7 @@ require "net/ssh"
 class Routers
 
   @@start_address = "10.20.20."
-  @@start_at = 30
+  @@start_at = 43
   @@stop_at = 80
 
   def initialize
@@ -21,32 +21,50 @@ class Routers
     # run command
   end
 
+  # takes a block and yields ip and connectio to
+  # every succesful connection
   def all_ips
-    connections = {}
     while(@at < @@stop_at)
-      error = nil
       begin
         connection = Net::SSH.start(at , "root" ,
             password:  Rails.application.credentials.sala,
             non_interactive: true ,
             timeout: 4)
         puts "Ok #{at}"
-        connections[at] = connection
+        yield( at , connection)
+        break
       rescue Net::SSH::ConnectionTimeout
-        error = "  Timed out ssh"
+        puts "Not at #{at}  Timed out ssh"
       rescue Errno::ETIMEDOUT
-        error = "  Timed out erro"
+        puts "Not at #{at}  Timed out erro"
       rescue Errno::EHOSTUNREACH
-        error = "  Host unreachable"
+        puts "Not at #{at}  Host unreachable"
       rescue Errno::ECONNREFUSED
-        error = "  Connection refused"
+        puts "Not at #{at}  Connection refused"
       rescue Net::SSH::AuthenticationFailed
-        error = "  Authentication failure"
+        puts "Not at #{at}  Authentication failure"
       end
-      puts "not at #{at} #{error}" if error
       @at += 1
     end
   end
 
+  # create a reboot at 2:30
+  # destructively in the same location,
+  # ie can rerun to ensure, but other changes will be lost
+  def make_cron
+    # Reboot at 2:30am every day
+    # Note: To avoid infinite reboot loop, wait 70 seconds
+    # and touch a file in /etc so clock will be set
+    # properly to 2:31 on reboot before cron starts.
+    cron_job = "30 2 * * * sleep 70 && touch /etc/banner && reboot"
+    cron_file = "/etc/crontabs/root"
+    cron_create = "echo '#{cron_job}' > #{cron_file}"
+    crond_restart = "/etc/init.d/cron restart"
+    all_ips do |ip , connection|
+      connection.exec!(cron_create)
+      connection.exec!(crond_restart)
+      puts "Cron for #{ip} ok"
     end
-Routers.new.all_ips
+  end
+end
+Routers.new.make_cron