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Curl retry mechanism

  • 18-03-2017 10:38am
    #1
    IamtheWalrus
    Closed Accounts Posts: 6,075 ✭✭✭


    I have a script I run to deploy 2 web services and a front-end application. The script calls a method that checks to see if the 2 back-end services are up and running. If so, deem the deploy successful, otherwise revert.

    The 2 services sometimes take longer than the front-end to start up. Currently I put in a sleep call to delay the web service check. This allows them time to start up.

    I want to remove this sleep and add in a retry mechanism so that if a service is down, just retry the check repeatedly until I get a response.

    Tp check if the device is up, I use curl. I've read that curl has a retry mechanism but I've never used it.

    Have any of you solved this problem before? I want to understand the things I must consider when solving it, e.g. do I retry until i get a HTTP 200 from my service?

    Anyone any suggestions how I'd test this? I'd need to find a service that was down.


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