Sysdeploy/cloud-init-cherrypy
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Check if DNS round robin is possible #7

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opened 2024-04-17 11:04:38 +02:00 by PeterSurda · 0 comments
PeterSurda commented 2024-04-17 11:04:38 +02:00
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I'd like to use multiple servers with DNS round robin, so that I don't have a SPOF. The source code of cloud-init appears to use pythons' requests library for retrieving the files. I tried a simplified version of the same code in command line python, and it looks like if there are multiple A records, for each retry loop, it will try each IP address. I used wireshark becuase the doesn't seem to be any obvious way to dump the IP address from requests if the TCP connection fails. So for many types of failures, a simple multiple DNS records would work. However for some responses it may not help, e.g. if the server returns a code 200 but garbled content. But I'm not sure if that's even a scenario which we have to protect against.

I'd like to use multiple servers with DNS round robin, so that I don't have a SPOF. The source code of cloud-init appears to use pythons' requests library for retrieving the files. I tried a simplified version of the same code in command line python, and it looks like if there are multiple A records, for each retry loop, it will try each IP address. I used wireshark becuase the doesn't seem to be any obvious way to dump the IP address from requests if the TCP connection fails. So for many types of failures, a simple multiple DNS records would work. However for some responses it may not help, e.g. if the server returns a code 200 but garbled content. But I'm not sure if that's even a scenario which we have to protect against.
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Reference: Sysdeploy/cloud-init-cherrypy#7
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