Does anyone know of a simple monitoring tool that can periodically send a request to a web service and alert me when it does not receive a response? nothing unusual, just planning and reporting.
I use http://pingdom.com/ for a good effect. It can not only check whether the site is up or down, but can also be set to check for specific text (for example, "sql error" will be an error). He has more features and very nice reports, as well as regular emails for everyday life.
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JMeter , unix cron,
Content Site Monitor (http://www.contentsitemonitor.com). -, . . ping , , . / , , , / . , 3 !
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- - , curl twill.
curl - URL, FTP, FTPS, HTTP, HTTPS, SCP, SFTP, TFTP, TELNET, DICT, LDAP, LDAPS FILE. curl SSL-, HTTP POST, HTTP PUT, FTP-, HTTP-, -, cookie, (Basic, Digest, NTLM, Negotiate, kerberos...),...
...
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Repeating the probe can be done using cronon Linux and Task Scheduleron Windows.
cron
Task Scheduler
I have used Alertra in the past. It was very good. They access your site from various places around the world. This is a subscription service, so do not install anything. Just pay monthly. No contract, IIRC.