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This article introduces the relevant knowledge of "what is the role of linux clusters". In the operation of actual cases, many people will encounter such a dilemma. Then let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

For some application systems that require strong real-time services, it is necessary to ensure that the services run uninterrupted 24 hours a day, but due to some unpredictable reasons, a single device operating environment is difficult to provide such service requirements, so building a cluster system is an indispensable choice.

Scalability of Linux Cluster

The scalability of the cluster is reflected in that it can meet the needs of users at any time. With the increase of business, when the existing cluster service entities can not meet the needs, one or more service nodes can be dynamically added to the cluster to enhance the overall performance of the cluster. This is the embodiment of cluster scalability.

Cluster load balancing and error recovery

The advantages of cluster are mainly reflected in load balancing and error recovery: one is the embodiment of load balancing; the other is the support for error recovery.

Through flexible and effective system load sharing, combined with the cluster customized load sharing strategy, the client access is reasonably allocated to each service node, so as to effectively use resources and achieve load balancing. For example, when defining a polling allocation policy, the request is evenly distributed to each service node. If the minimum load distribution policy is defined, when there is a request for access, the cluster system will automatically analyze and determine which node has less pressure. Distribute the request to the corresponding node.

In order to ensure that each executing task can be completed effectively, through erroneous redirection, when a task is running on a node, the execution fails due to unpredictable reasons, at this time, the error mechanism will start another service node to continue to complete the task, which is the error recovery function of the cluster.

The external architecture has been very secure, heartbeat technology to ensure effective internal communication between nodes in the cluster system. Heartbeat monitoring is realized through heartbeat line. in order to achieve load balancing, provide highly available services and perform error recovery, the cluster system provides heartbeat monitoring technology.

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