Network and method for coordinating high availability system services

A network of a plurality of nodes, comprising:

• a master node having a primary server to run a centralized system service;
• a vice node having a secondary server to run said centralized system service;
• and
• a system services coordinator to coordinate functions regarding said centralized system service at said plurality of nodes.

A method for coordinating a system service within a network having a plurality of nodes, comprising:

• receiving a request at a system services coordinator, said system services coordinator having a component at each of said plurality of nodes;
• using a callback sequence for performing a function at one of said plurality of nodes in response to said request;
• and
• reacting to said function by said system services coordinator on said node and communicating said reaction to said system services coordinator.

A method for coordinating a function for a system service server on a node, comprising:

• receiving a callback sequence at said system service server from a system services coordinator;
• determining levels of said callback sequence, said levels correlating to stages of completing said function;
• receiving said levels at said system services coordinator;
• and
• publishing events from said node by said system services coordinator correlating to said received levels.

A method for initializing a node within a network having centralized system services, comprising:

• registering said centralized system services on said node with a system services coordinator;
• triggering an initialization function having levels;
• and
• receiving notification at said system services coordinator for completing said levels.

A method for coordinating initialization in a network having a plurality of nodes, comprising:

• registering centralized system services within said network with a system services coordinator;
• electing a master node within said network and sending information on said master node to said plurality of nodes;
• using callbacks registered at said system services coordinator to trigger initialization levels at said plurality of nodes;
• and
• informing said plurality of nodes when said master node completes said initialization levels via said system services coordinator.

A method for switching over a master node having primary servers for centralized system services within a network having a plurality of nodes, comprising:

• informing a system services coordinator on said master node of a loss of master eligibility on said master node;
• invoking switchover callbacks registered at said system services coordinator;
• and
• transferring states of said primary servers to secondary servers for said centralized system services at a vice node.

A method for demoting a master eligible node within a network for exchanging information, comprising:

• initiating a demote callback sequence from a system services coordinator;
• transitioning centralized system services servers on said node to a spare state;
• and
• updating said system services coordinator.

A method for disqualifying a node from being master eligible within a network for exchanging information, comprising:

• initiating a disqualify callback sequence from a system services coordinator;
• setting a master eligible attribute at said node;
• and
• transitioning centralized system servers on said node to an offline state.

A method for qualifying a node to be master eligible within a network for exchanging information, comprising:

• initiating a qualify callback sequence from a system services coordinator;
• setting a master eligible attribute at said node;
• and
• transitioning centralized system servers on said node to a spare state.

A method for shutting down a node within a network for exchanging information, comprising:

• invoking callbacks of centralized system services on said node by a system services coordinator;
• requesting said node be removed from said network by said system services coordinator;
• and
• terminating said system services coordinator.

A method for removing a node from a network, comprising:

• initiating a shutdown callback sequence from a system services coordinator, wherein said shutdown callback sequence includes levels;
• notifying said system services as said levels are completed and terminating centralized system services on said node;
• and
• terminating said system service coordinator.

A method for coordinating centralized system services on a node within a network, said network exchanging information with said node, comprising:

• initializing said node by an initialization function according to a system services coordinator;
• invoking a callback sequence at said node by said system services coordinator;
• updating said centralized system services and non-centralized system services with information received by said system services coordinator;
• communicating with a master node within said network and synchronizing said initialization function with said master node;
• determining a change in configuration of said node within said network;
• and
• executing a function at said node according to said system services coordinator, said function responding to said change in configuration.

A computer program product comprising a computer useable medium having computer readable code embodied therein for coordinating a system service within a network having a plurality of nodes, the computer program product adapted when run on a computer to execute steps, including:

• receiving a request at a system services coordinator, said system services coordinator having a component at each of said plurality of nodes;
• using a callback sequence for performing a function at one of said plurality of nodes in response to said request;
• and
• reacting to said function by said system service on said node and communicating said reaction to said system services coordinator.

A computer program product comprising a computer useable medium having computer readable code embodied therein for coordinating a function for a system on a node, the computer program product adapted when run on a computer to execute steps including:

• receiving a callback sequence at said system service from a system services coordinator, said system services coordinator in communication with a primary server of said system service;
• determining levels of said callback sequence, said levels correlating to stages of completing said function;
• receiving said levels at said system services coordinator;
• and
• publishing events from said node by said system services coordinator correlating to said received levels.

A computer program product comprising a computer useable medium having computer readable code embodied therein for initializing a node within a network having centralized system services, the computer program product adapted when run on a computer to execute steps including:

• registering said centralized system services on said node with a system services coordinator;
• triggering an initialization function having levels;
• and
• receiving notification at said system services coordinator for completing said levels.

A computer program product comprising a computer useable medium having computer readable code embodied therein for coordinating initialization in a network having a plurality of nodes, the computer program product adapted when run on a computer to execute steps including:

• registering centralized system services within said network with a system services coordinator;
• electing a master node within said network and sending information on said master node to said plurality of nodes;
• using callbacks registered at said system services coordinator to trigger initialization levels at said plurality of nodes;
• and
• informing said plurality of nodes when said master node completes said initialization levels via said system services coordinator.

A computer program product comprising a computer useable medium having computer readable code embodied therein for switching over a master node having primary servers for centralized system services within a network having a plurality of nodes, the computer program product adapted when run on a computer to execute steps including:

• informing a system services coordinator on said master node of a loss of master eligibility on said master node;
• invoking switchover callbacks registered at said system services coordinator;
• and
• transferring states of said primary servers to secondary servers for said centralized system services at a vice node.

A computer program product comprising a computer useable medium having computer readable code embodied therein for demoting a master eligible node within a network for exchanging information, the computer program product adapted when run a computer to execute steps including:

• initiating a demote callback sequence from a system services coordinator;
• transitioning centralized system services servers on said node to a spare state;
• and
• updating said system services coordinator.

A computer program product comprising a computer useable medium having computer readable code embodied therein for disqualifying a node from being master eligible within a network for exchanging information, the computer program product adapted when run on a computer to execute steps including:

• initiating a disqualify callback sequence from a system services coordinator;
• setting a master eligible attribute at said node;
• and
• transitioning centralized system servers on said node to an offline state.

A computer program product comprising a computer useable medium having computer readable code embodied therein for qualifying a node to be master eligible within a network of exchanging information, the computer program product adapted when run on a computer to execute steps including:

• initiating a qualify callback sequence from a system services coordinator;
• setting a master eligible attribute at said node;
• and
• transitioning centralized system servers on said node to a spare state.

A computer program product comprising a computer useable medium having computer readable code embodied therein for shutting down a node within a network for exchanging information, the computer program product adapted when run on a computer to execute steps including:

• invoking callbacks of centralized system services on said node by a system services coordinator;
• requesting said node be removed from said network by said system services coordinator;
• and
• terminating said system services coordinator.

A computer program product comprising a computer useable medium having computer readable code embodied therein for removing a node from a network, the computer program product adapted when run on a computer to execute steps including:

• initiating a shutdown callback sequence from a system services coordinator, wherein said shutdown callback sequence includes levels;
• notifying said system services as said levels are completed and terminating centralized system services on said node;
• and
• terminating said system service coordinator.

A computer program product comprising a computer useable medium having computer readable code embodied therein for coordinating centralized system services on a node within a network, said network exchanging information with said node, the computer program product adapted when run on a computer to execute steps including:

• initializing said node by an initialization function according to a system services coordinator;
• invoking a callback sequence at said node by said system services coordinator;
• updating said centralized system services and non-centralized system services with information received by said system services coordinator;
• communicating with a master node within said network and synchronizing said initialization function with said master node;
• determining a change in configuration of said node within said network;
• and
• executing a function at said node according to said system services coordinator, said function responding to said change in configuration.