Detect if site crashed [closed]

It is basically possible to identify whether a host or server is available by performing a ping through its hostaname or IP .

A ping example that worked (ie, the host / site is standing):

Pinging prd029 [xxx.xx.xx.x] with 32 bytes of data:

Reply from 172.16.5.69: bytes=32 time=21ms TTL=254
Reply from 172.16.5.69: bytes=32 time=21ms TTL=254
Reply from 172.16.5.69: bytes=32 time=20ms TTL=254
Reply from 172.16.5.69: bytes=32 time=22ms TTL=254

Ping statistics for 172.16.5.69:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% los
Approximate round trip times in milli-seconds:
    Minimum = 20ms, Maximum = 22ms, Average = 21ms

An example of a failed ping:

Pinging www.google.com [216.58.222.4] with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 216.58.222.4:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

  

However, it is incorrect to say that a failure in ping can   characterize a "drop" of the site / system. You can still have   routing problems from your IP to what you want to get.

     

I tested Google, for example, and it did not work because the problem was on my network.

I think this site should check port 80 of the site you type. If you want something to control uses Nagios , with it you can monitor the status of any service, be it database, website, ftp , email, etc.

It does this by monitoring the service port, the cool thing is that you can create alerts to notify you if the service goes down.