Placement of containerized applications in a network for embedded centralized discovery controller (CDC) deployment
System and method embodiments of centralized discovery controller (CDC) services on a switching network fabric are disclosed. Nodes on the switching network fabric are categorized into leader nodes, e.g., spine switches, and follower nodes, e.g., leaf switches. The CDC services may be divided into centralized CDC services and distributed CDC services, which have direct connections to endpoints for seamless horizontal scaling of endpoints. The centralized CDC services may be placed on a leader node, and the distributed CDC services may be placed among the follower nodes. Operations of the CDC services may be monitored. In case of a node failure, CDC services deployed on the failed node may be moved or transferred to one or more other nodes that have the same role as the failed node. Implementations of the CDC service placement embodiments enable seamless horizontal scaling for endpoints and provide capability for more visibility and monitoring of endpoint.
1. A computer-implemented method for placement of centralized discovery controller (CDC) services comprising:
given a plurality of endpoints and a network fabric comprising a plurality of nodes comprising at least one leader node and multiple follower nodes in the network fabric:
dividing a plurality of CDC services into one or more centralized services and multiple distributed services, the one or more centralized services configured to have connectivity to the multiple distributed services;
placing the one or more centralized services on a leader node on the at least one leader node; and
placing the multiple distributed services on or distributed across the multiple follower nodes, the multiple distributed services being placed closer to the plurality of endpoints than the one or more centralized services are to the plurality of endpoints.
2. The computer-implemented method of claim 1 further comprising:
monitoring operations of the one or more centralized services and the multiple distributed services; and
responsive to failure of a node that is placed with at least one CDC service, moving or transferring the at least one CDC service to one or more other nodes that have a same role as the failed node.
3. The computer-implemented method of claim 2 wherein:
responsive to the failed node being the leader node, moving the one or more centralized services to a backup leader node; and
responsive to the failed node being a follower node, moving one or more distributed services placed on the follower node to one or more other follower nodes.
4. The computer-implemented method of claim 3 wherein the backup leader node is chosen automatically based on available resources of the network fabric, and a Domain Name System (DNS) service is updated automatically by a placement service as part of a leader node change so that the DNS service update is available to all CDC other services in the network fabric.
5. The computer-implemented method of claim 1 wherein the at least one leader node and the multiple follower nodes are determined dynamically by a placement service that uses one or more factors comprising role of a node and position of a node in the network fabric.
6. The computer-implemented method of claim 1 wherein determining at least one leader node and multiple follower nodes involves at least one of:
a role for each node in a topology of the network fabric; and
a location for each node in the topology of the network fabric.
7. The computer-implemented method of claim 1 wherein:
responsive to one or more new endpoints to be added for accessing the network fabric,
adding one or more follower nodes to the network fabrics, the one or more added follower nodes having connections to the one or more new endpoints with new distributed services instantiated on the one or more added follower nodes.
8. An information handling system for placement of centralized discovery controller (CDC) services comprising:
one or more processors; and
a non-transitory computer-readable medium or media comprising one or more sets of instructions which, when executed by at least one of the one or more processors, causes steps to be performed comprising:
determining at least one leader node and multiple follower nodes in a network fabric that comprises a plurality of nodes;
dividing a plurality of CDC services into one or more centralized services and multiple distributed services, the one or more centralized services configured to have connectivity to the multiple distributed services;
placing the one or more centralized services on a leader node on the at least one leader node; and
placing the multiple distributed services on or distributed across the multiple follower nodes, the multiple distributed services being placed closer to a plurality of endpoints than the one or more centralized services are to the plurality of endpoints.
9. The information handling system of claim 8 wherein the non-transitory computer-readable medium or media further comprises one or more sequences of instructions which, when executed by at least one of the one or more processors, causes steps to be performed comprising:
monitoring operations of the one or more centralized services and the multiple distributed services; and
responsive to failure of a node that is placed with at least one CDC service, moving or transferring the at least one CDC service to one or more other nodes that have a same role as the failed node.
10. The information handling system of claim 9 wherein:
responsive to the failed node being the leader node, moving the one or more centralized services to a backup leader node; and
responsive to the failed node being a follower node, moving one or more distributed services placed on the follower node to one or more other follower nodes.
11. The information handling system of claim 10 wherein the backup leader node is chosen automatically based on available resources of the network fabric, and a Domain Name System (DNS) service is updated automatically by a placement as part of a leader node change so that the DNS service update is available to other services in the network fabric.
12. The information handling system of claim 8 wherein the at least one leader node and the multiple follower nodes are determined dynamically by a placement service that uses one or more factors comprising role of a node and position of a node in the network fabric.
13. The information handling system of claim 8 wherein the non-transitory computer-readable medium or media further comprises one or more sequences of instructions which, when executed by at least one of the one or more processors, causes steps to be performed comprising:
responsive to one or more new endpoints to be added for accessing the network fabrics, adding one or more follower nodes to the network fabric, the one or more added follower nodes having connections to the one or more new endpoints with new distributed services instantiated on the one or more added follower nodes.
14. A non-transitory computer-readable medium or media comprising one or more sequences of instructions which, when executed by at least one processor, causes steps for placement of centralized discovery controller (CDC) services comprising:
given a plurality of endpoints and a network fabric comprising a plurality of nodes comprising at least one leader node and multiple follower nodes in the network fabric:
dividing a plurality of CDC services into one or more centralized services and multiple distributed services, the one or more centralized services configured to have connectivity to the multiple distributed services;
placing the one or more centralized services on a leader node on the at least one leader node; and
placing the multiple distributed services on the multiple follower nodes, the multiple distributed services being placed closer to the plurality of endpoints than the one or more centralized services are to the plurality of endpoints.
15. The non-transitory computer-readable medium or media of claim 14 wherein determining at least one leader node and multiple follower nodes involves at least one of:
a role for each node in a topology of the network fabric; and
a location for each node in the topology of the network fabric.
16. The non-transitory computer-readable medium or media of claim 14 wherein the at least one leader node and the multiple follower nodes are determined dynamically by a placement service that uses one or more factors comprising role of a node and position of a node in the network fabric.
17. The non-transitory computer-readable medium or media of claim 14 further comprising one or more sequences of instructions which, when executed by at least one processor, causes steps to be performed comprising:
monitoring operations of the one or more centralized services and the multiple distributed services; and
responsive to failure of a node that is placed with at least one CDC service, moving or transferring the at least one CDC service to one or more other nodes that have a same role as the failed node.
18. The non-transitory computer-readable medium or media of claim 17 wherein:
responsive to the failed node being the leader node, moving the one or more centralized services to a backup leader node; and
responsive to the failed node being a follower node, moving one or more distributed services placed on the follower node to one or more other follower nodes.
19. The non-transitory computer-readable medium or media of claim 14 further comprising one or more sequences of instructions which, when executed by at least one processor, causes steps to be performed comprising:
responsive to one or more new endpoints to be added for accessing the network fabric, adding one or more follower nodes to the network fabrics, the one or more added follower nodes having connections to the one or more new endpoints with new distributed services instantiated on the one or more added follower nodes.
20. The non-transitory computer-readable medium or media of claim 18 wherein the backup leader node is chosen automatically based on available resources of the network fabric, and a Domain Name System (DNS) service is updated automatically by a placement as part of a leader node change so that the DNS service update is available to other services in the network fabric.