RHEL 7 features (6): Cluster

From: Linux China 00:00:00

Ed Hat Enterprise Linux 7.0 is Red Hat's next-generation operating system complete suite designed for mission-critical enterprise-level computing and top-level enterprise-level software and hardware retailer certification.

A cluster is used by multiple computers (nodes) to improve the reliability, scalability, and availability of important products and services.

You can deploy the high availability of Red Hat Enterprise Linux 7.0 based on different configurations for performance, high availability, load balancing, and file sharing. Note: Red Hat Enterprise Linux 7.0 Server Load balancer is now part of Red Hat Enterprise Linux.

Pacemaker Cluster Manager

Red Hat Enterprise Linux 7.0PacemakerReplaceRgmanagerManage cluster resources and recover from node failure.PacemakerAdvantages include:

• Automatic synchronization and version management of resource configuration.
• The flexible resource and fencing modes can be more closely matched with the user environment.
• You can use fencing to restore the resource layer.
• Time-based configuration options.
• The ability to run the same resource on multiple nodes. For example, webpage server or cluster file system.
• The ability to run the same resource on multiple nodes in one of two different modes. For example, synchronize resources and targets.
• Pacemaker does not need Distributed Lock management programs.
• Configurable behavior when arbitration is lost or multiple partitions are formed.

Replace piranha with keepalived and haproxy

Red Hat Enterprise Linux 7.0KeepalivedAndHaproxyReplaced by the Load Balancing ProgramPiranha. The keepalived package provides simple and powerful load balancing and high availability features. The server Load balancer Framework relies on a well-known and widely used Linux virtual server kernel module to provide layer-4 network load balancing. The keepalived daemon uses a group of status check programs in the server pool of Server Load balancer. The keepalived daemon also uses the vro redundancy protocol (vrrp) to allow failover between routers or managers for high availability.HaproxyProvides a reliable High-Performance Network Load Balancing Program for TCP and HTTP applications. It is especially suitable for webpages with high load when persistence or layer7 is required.

High Availability Management

PacemakerN. Leader; leader; PACER; pacemaker; configuration system, also knownPCs, ReplacedCCS,RicciAndLuciAs a unified cluster configuration and management tool.PCsAdvantages include:

• Command line tool.
• You can easily start the cluster, that is, initialize the cluster and start it to run.
• You can configure cluster options.
• You can add, delete, or modify resources and their relationships.

New Resource proxy

Red Hat Enterprise Linux 7.0 provides a large number of resource proxies. Standard Interface for cluster resources when resources are proxies. The resource proxy can convert a set of standard operations to a specific resource or application step, and interpret the result as success or failure.

 

Robustness is the transliteration of robust, which means robustness and robustness. It is the key to system survival in exceptional and dangerous situations. For example, whether a computer software fails to crash or crash when input errors, disk faults, network overload, or intentional attacks are detected is the robustness of the software. The so-called "robustness" refers to the control system maintaining some other performance characteristics under a certain (structure, size) parameter disturbance. According to different definitions of performance, it can be classified into stable robustness and performance robustness. The fixed controller designed with the robustness of the closed-loop system as the target is called the robust controller.

This series of articles from the release notes of RHEL 7.0, complete content please move: https://access.redhat.com/documentation/zh-CN/Red_Hat_Enterprise_Linux/7/html/7.0_Release_Notes/index.html

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