# Website monitor?

**URL:** <https://www.ruby-forum.com/t/website-monitor/79858>\
**Category:** Rails\
**Created:** [March 11, 2006, 4:25pm UTC](https://www.ruby-forum.com/t/website-monitor/79858 "2006-03-11T16:25:18Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![joe-black](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/87869e/32.png) [@joe-black](https://www.ruby-forum.com/u/joe-black)\
**Post date:** [March 11, 2006, 4:25pm UTC](https://www.ruby-forum.com/t/website-monitor/79858/1 "2006-03-11T16:25:18Z")

</div>

hi all.  
i have a site powered by ROR. now, i try to find a monitor based on  
ruby.  
any one have any idea?

regards.

---

<div class="post-metadata">

**Author:** ![joe-black](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/87869e/32.png) [@joe-black](https://www.ruby-forum.com/u/joe-black)\
**Post date:** [March 11, 2006, 8:44pm UTC](https://www.ruby-forum.com/t/website-monitor/79858/2 "2006-03-11T20:44:51Z")

</div>

On Mar 11, 2006, at 7:25 AM, Joe B. wrote:

> hi all.  
> i have a site powered by ROR. now, i try to find a monitor based on  
> ruby.  
> any one have any idea?
> 
> regards.
> 
> –

```
Here is a simple monitor script. Make sure you read it and replace

```

the placeholder info with the sites you want monitored and the email  
address and unix user the emails are sent from/to. Set it up with cron.

Cheers-  
-Ezra

ez@brainspl:~/mon$ cat site\_monitor.rb  
#! /usr/local/bin/ruby

# 

# simple script to monitor websites

# 

# sample cron line

# 

# \*/15 \* \* \* \* /usr/local/bin/ruby /home/ez/mon/site\_monitor.rb \> /

dev/null 2\>&1

# 

require “net/http”  
require “net/smtp”  
require “yaml/store”  
require “socket”

# 

# array of urls to ping

# 

uris = %w(  
[foo.railsapp.com](http://foo.railsapp.com)  
[bar.railsapp.com](http://bar.railsapp.com)  
[whatever.net](http://whatever.net)  
)

# 

# array of people to notify if urls are down

# 

recipients = %w(  
removed\_email\_address@domain.invalid  
)

# 

# message format string

# 

msg\_fmt = %Q(  
URI: %s

```
 TIME: %s

 EXCEPTION: %s\n%s

```

)

# 

# user to send messages as

# 

user = “your\_unix\_user\_name”

# 

# host to send messages from

# 

host = ENV[“HOSTNAME”] || ENV[“HOST”] || Socket::gethostname

# 

# maximum number of messages to send

# 

msg\_max = 3

# 

# db class to store codes/notifications

# 

class DB  
attr “path”  
attr “db”  
def initialize path = File::join(File::expand\_path(“~”), “.uri.db”)  
@path = path  
@db = ::YAML::Store::new @path  
end  
def reset uri  
@db.transaction{ @db[uri] = {“success” =\> true, “msgs” =\> 0} }  
end  
def [] uri  
@db.transaction{ @db[uri] } || reset(uri)  
end  
def []= uri, record  
@db.transaction{ @db[uri] = record }  
end  
end

# 

# umbrella error class

# 

class SiteDownError \< StandardError; end

# 

# ping each url, mail messages if failure for any reason…

# 

db = DB::new

uris.each do |uri|  
begin  
raise SiteDownError unless  
Net::HTTPOK === Net::HTTP::new(uri, 80).get(“/”)  
y uri =\> “up”  
db.reset uri

```
 rescue Exception => e
   y uri => "down"
   record = db[uri]

   if record["msgs"] < msg_max
     now = Time::now
     msg = msg_fmt % [uri, now, e, e.backtrace.join("\n").gsub(%r/

```

^/,“\t”)]  
from = “%s@%s” % [user, host]

```
     Net::SMTP::start("localhost") do |smtp|
       recipients.each do |recipient|
         email = "From: #{ from }\r\n" <<
                 "To: #{ recipient }\r\n" <<
                 "Subject: #{ uri } DOWN @ #{ now }\r\n" <<
                 "\r\n#{ msg }"
         smtp.send_message email, from, recipient
       end
     end

     record["success"] = false
     record["msgs"] += 1
     db[uri] = record
   end
 end

```

end

---

<div class="post-metadata">

**Author:** ![joe-black](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/87869e/32.png) [@joe-black](https://www.ruby-forum.com/u/joe-black)\
**Post date:** [March 11, 2006, 9:55pm UTC](https://www.ruby-forum.com/t/website-monitor/79858/3 "2006-03-11T21:55:09Z")

</div>

Here’s a second vote for Monastic. I use it to monitor two or three  
sites. Fre and simple.

On 3/11/06, Ben R. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> > > hi all.  
> > > the placeholder info with the sites you want monitored and the email
> > 
> > # sample cron line
> > 
> > # array of urls to ping
> > 
> > ```
> > removed_email_address@domain.invalid
> > 
> > ```
> > 
> > )
> > 
> > # 
> > 
> > ```
> > end
> > 
> > ```
> > 
> > # 
> > 
> > ```
> > raise SiteDownError unless
> > msg = msg_fmt % [uri, now, e, e.backtrace.join("\n").gsub(%r/
> > end
> > 
> > ```
> > 
> > Rails mailing list  
> > removed\_email\_address@domain.invalid  
> > [http://lists.rubyonrails.org/mailman/listinfo/rails](http://lists.rubyonrails.org/mailman/listinfo/rails)

–  
=\> the blog from beyond \<=  
=\> [www.eyeheartzombies.com](http://www.eyeheartzombies.com) \<=

---

<div class="post-metadata">

**Author:** ![joe-black](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/87869e/32.png) [@joe-black](https://www.ruby-forum.com/u/joe-black)\
**Post date:** [March 11, 2006, 9:39pm UTC](https://www.ruby-forum.com/t/website-monitor/79858/4 "2006-03-11T21:39:36Z")

</div>

If you just want to monitor if the server is up or not (monitor is a  
vague term), you could use Montastic. It is a free site monitor  
powered by RoR.

> **[Montastic Website Monitoring](https://www.montastic.com/)**
>
> The mighty websites monitoring & status page software. Free plan available. Free for open source software.

On 3/11/06, Ezra Z. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> > –  
> > #! /usr/local/bin/ruby  
> > require “net/smtp”
> 
> # 
> 
> # 
> 
> ```
> attr "db"
> def []= uri, record
> 
> ```
> 
> db = DB::new  
> record = db[uri]  
> “To: #{ recipient }\r\n” \<\<  
> end  
> end
> 
> * * *
> 
> Rails mailing list  
> removed\_email\_address@domain.invalid  
> [http://lists.rubyonrails.org/mailman/listinfo/rails](http://lists.rubyonrails.org/mailman/listinfo/rails)

–  
Ben R.  
[http://www.benr75.com](http://www.benr75.com)