Monday, 2020-10-26

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abbbii have setup an OVN network with a simple switch assigning dhcp addresses on the configured ports. How to setup DNS resolution? I have added an DNS record which is listed in the "ovn-sbctll ist DNS", but i fail to see how nodes which are connected to the ovn network are supposted to resolve? I read somewhere that the DNS requests are routed to the controller node by flow rules, but how does it work at07:25
abbbiall?07:25
numansabbbi, Hi07:25
numansabbbi, is the dns working as expected ?07:25
abbbinumans: i dont understand the concept, which IP is going to be the DNS "server" in this network? A router which i have to add? The swich itself?07:26
numansabbbi, the OVN internal DNS is a basic resolver for internal dns resolution i.e within the logical switch/router07:27
numansabbbi, if you have configured dns for a logical switch, then the udp dns packet is sent to ovn-controller as packet-in. It checks the internal dns records present in the OVN southbound database.07:28
abbbinumans: so that does only work if the system resolving is only part of the logical switch network and has no "external" dns server configured?07:28
numansand if it finds, it sends a reply, otherwise the packet is resumed and if you hv configured an actual dns server in your deployment, it is expected to resolve it.07:29
numansabbbi, yes.07:29
abbbiah ok, then i get it. The system i have configured a port on the logical switch is also part of another network.07:29
numansabbbi, https://docs.openstack.org/project-deploy-guide/charm-deployment-guide/latest/app-ovn.html07:30
numansyou can grep for "Internal DNS resolution"07:30
numansit has some details.07:30
numansabbbi, although I'm not sure if you are using openstack or not.07:30
abbbiyes, i had seen that, im not using openstack :)07:31
abbbibut well, you just confirmed my thoughts so everything OK, then i will use something else for DNS, because all the systems that will be connected to the LS will also have another network with available DNS server connected.07:32
abbbidoesnt make sense to use the internal dns resolver then07:32
numansabbbi, ack.07:32
abbbithanks :)07:32
numanswelcome07:32
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