remote server health check from Dreamhost Cron

ping_server.rb

#!/usr/bin/ruby
require 'net/http'
require 'net/smtp' 
require 'uri'
require 'yaml'

#set up logger
require 'logger'
logger = Logger.new('/home/cdk888/scripts/logs/ping.log', 'daily')

url="http://home.chris888.com"
ping_ok=true
email_ok=false
error=""
res_body=""
res_code="500"

#email_credentials
begin
yml = YAML.load_file("/home/cdk888/scripts/email.yml")
smtp_server=yml['smtp_server']
smtp_port=yml['smtp_port']
from_domain=yml['from_domain']
smtp_account=yml['smtp_account']
smtp_password=yml['smtp_password']
email_from=yml['email_from']
email_to=yml['email_to']
email_ok=true
rescue Exception => e
	ping_ok=false
	error="error loading yaml file"
end
#ping remote server
begin
	url = URI.parse(url)
	res = Net::HTTP.start(url.host, url.port) {|http|
		http.get('/ping.html')
	}
	res_body=res.body
	res_code=res.code
rescue Exception => e
	ping_ok=false
	error="Something went wrong!\n"+e.to_s
end

if res_code != "200" && ping_ok
	ping_ok=false
	error="ping didn't return 200\nHTTP Status=#{res_code}\nHTTP Body=#{res_body}"
end
#deal with bad ping
if !ping_ok
	logger.error(error)
	if email_ok
		the_email = "From: #{email_from}\nSubject: Ping Fail\n\n#{error}.\n\n"  
		# handling exceptions  
		begin  
			Net::SMTP.start(smtp_server, smtp_port,from_domain,smtp_account,smtp_password, :plain) do |smtpclient|  
    		smtpclient.send_message(the_email, email_from, email_to)  
    	end  
		rescue Exception => e  
  			logger.error("Exception occured: " + e)
		end
	end
	#do some check of last error
else
	logger.warn("ping ok")
end