Methods and systems are disclosed for a digital signature system using scalable and reliable servers. The system includes multiple frontend servers that are each in communication with multiple backend servers. A remote application server sends a signature request to one of the front end servers. The signature request includes at least two public keys that each have a different server identifier embedded in them. The backend server extracts one of the server identifiers and tries the signature generating process with the corresponding back end server. If that that backend server does not respond, then the frontend server extracts the server identifier from another public key and initiates the signature generation process with that backend server. In some systems, the remote application server has a predefined relationship with multiple frontend servers so that if one frontend server is down, the application server can communicate with a backup frontend server.

A network arrangement that employs a cache having copies distributed among a plurality of different locations. The cache stores state information for a session with any of the server devices so that it is accessible to at least one other server device. Using this arrangement, when a client device switches from a connection with a first server device to a connection with a second server device, the second server device can retrieve state information from the cache corresponding to the session between the client device and the first server device. The second server device can then use the retrieved state information to accept a session with the client device.

Systems and methods of the present invention for maintaining network data distribution are provided. Network data may be distributed in such as manner as to allow a network session to weather interrupted communications between host and clients without significant loss of data. Embodiments of the present invention provide for one or more clients to serve as backup host(s) for the network session. When the other clients transmit data to the host, they may also transmit the data to one or more backup hosts if there are any indications of interrupted communication.

A system and method for diameter agent load balancing. The method including: receiving a request from a sending diameter node; parsing at least one Attribute-Value Pair (AVP) from the request; determining a partition-identifier (partition-id) from the at least one AVP; determining a receiving diameter node, based on the partition-id; and sending the request to the receiving diameter node. The system including: a message module configured to receive a request from a sending diameter node; a parsing module configured to parse at least one Attribute-Value Pair (AVP) of the message from the request and determine a partition-id from the at least one AVP and a receiving diameter node, based on the partition-id; and a forwarding module configured to send the request to the receiving diameter node.

A system and method for diameter agent load balancing. The method including: receiving a request from a sending diameter node; parsing at least one Attribute-Value Pair (AVP) from the request; determining a partition-identifier (partition-id) from the at least one AVP; determining a receiving diameter node, based on the partition-id; and sending the request to the receiving diameter node. The system including: a message module configured to receive a request from a sending diameter node; a parsing module configured to parse at least one Attribute-Value Pair (AVP) of the message from the request and determine a partition-id from the at least one AVP and a receiving diameter node, based on the partition-id; and a forwarding module configured to send the request to the receiving diameter node.

An electronic device, a method for domain name query, and related products are provided, which are for an electronic device. The method includes the following. Whether the electronic device enables a link aggregation (SLA) is detected in response to detecting an Internet protocol (IP) address query request for a target domain name. Multiple communication links enabled by the SLA are determined in response to detecting that the SLA is enabled. An IP address corresponding to the target domain name is obtained by querying multiple domain name system (DNS) servers through at least one target communication link of the multiple communication links.

The technology provides for live migration from a first cluster to a second cluster. For instance, when requests to one or more cluster control planes are received, a predetermined fraction of the received requests may be allocated to a control plane of the second cluster, while a remaining fraction of the received requests may be allocated to a control plane of the first cluster. The predetermined fraction of requests are handled using the control plane of the second cluster. While handling the predetermined fraction of requests, it is detected whether there are failures in the second cluster. Based on not detecting failures in the second cluster, the predetermined fraction of requests allocated to the control plane of the second cluster may be increased in predetermined stages until all requests are allocated to the control plane of the second cluster.

The technology provides for live migration from a first cluster to a second cluster. For instance, when requests to one or more cluster control planes are received, a predetermined fraction of the received requests may be allocated to a control plane of the second cluster, while a remaining fraction of the received requests may be allocated to a control plane of the first cluster. The predetermined fraction of requests are handled using the control plane of the second cluster. While handling the predetermined fraction of requests, it is detected whether there are failures in the second cluster. Based on not detecting failures in the second cluster, the predetermined fraction of requests allocated to the control plane of the second cluster may be increased in predetermined stages until all requests are allocated to the control plane of the second cluster.

A first forwarding VM may execute in a first availability zone and have a first IP address. Similarly, a second forwarding VM may execute in a second availability zone and have a second IP address. The first and second IP addresses may be recorded with a cloud DNS web service of a cloud provider such that both receive requests from applications directed to a particular DNS name acting as a single endpoint. A service cluster may include a master VM node and a standby VM node. An IPtable in each forwarding VM may forward a request having a port value to a cluster port value associated with the master VM node. Upon a failure of the master VM node, the current standby VM node may be promoted to execute in master mode and the IPtables may be updated to now forward requests having the port value to a cluster port value associated with the newly promoted master VM node (which was previously the standby VM node).

A first forwarding VM may execute in a first availability zone and have a first IP address. Similarly, a second forwarding VM may execute in a second availability zone and have a second IP address. The first and second IP addresses may be recorded with a cloud DNS web service of a cloud provider such that both receive requests from applications directed to a particular DNS name acting as a single endpoint. A service cluster may include a master VM node and a standby VM node. An IPtable in each forwarding VM may forward a request having a port value to a cluster port value associated with the master VM node. Upon a failure of the master VM node, the current standby VM node may be promoted to execute in master mode and the IPtables may be updated to now forward requests having the port value to a cluster port value associated with the newly promoted master VM node (which was previously the standby VM node).