webpass availability

Nginx reverse proxy, load balancing, high availability of keepalived Nginx reverse proxy, load balancing, high availability of keepalived I. nginx reverse proxy and Server Load balancer 1. What is reverse proxy and Server Load balancer? Strictly speaking, nginx is only used as the nginx proxv reverse proxy, because this reverse proxy function shows the effect of the Server Load balancer cluster, so this

I. Deployment environment: Server version: centos6.5 Active/standby mode: VIP: 192.168.3.30 (on the master) VIP: 192.168.3.32 (on backup) Host network parameters: Interface Master Backup Description Eth1 192.168.3.23 192.168.3.24 Intranet management IP Address Eth2 192.168.5.23 192.168.5.24 Heartbeat line Eth3 192.168.2.23 192.168.2.24 Internet (for temporary file download) Network Topology: 650) This. width

One, the website usability measure 1, the site is not available to measure: The site is not available is also known as a site failure, the industry commonly used how many 9来 to measure the usability of the site. 2. Usability Assessment of website Ii. High Availability Site architecture 1. Application Layer Servers located in the application tier typically respond to high concurrent access requests, and a set of server

1)keepalived use more simple : From the installation, configuration, use, maintenance and other aspects of the comparison, keepalived is much simpler than heartbeat, especially Heartbeat2.1.4 split into 3 sub-projects, installation, configuration, Use is more complex, especially when the problem, do not know which subsystem is the problem, and keepalived only 1 installation files, a configuration file, configuration file is also much simpler;2)heartbeat function more powerful : heartbeat Althoug

memcached cluster scheme has many, more than magent one, but the cluster software to achieve a high-availability feeling or a lack of a step, the most recommended solution should be software plus code to achieve high availability, at least to ensure that the site of 99.5% of the operational lines, the following is the cluster's scenario collection:Randy_shandong: memcached Walkthrough (1) Build mem

The recent slowdown in work has slowed the frequency of updates, and it took time to build the spring cloud Chinese community, almost daily with toothpaste-like time to do something meaningful. Failed to update the blog post as planned, and I am very sorry for my friends who continue to follow my blog.Before I wrote the Spring Cloud series, I had a thicker plan, and now I'm getting a lot of feedback and questions, so I'm going to make some adjustments, and then pull out some of the more focused

High availability of data is a key requirement for important database systems. This paper summarizes the features of DB2 9.5 which provide these functions. Understand the pros and cons of different solutions, and determine which approach is best for you. Brief introduction High availability is a key requirement for important database applications. IBM DB2 9.5 offers many features to meet this requirement.

Introduction to Basic technology Introduction to AIX LVM Mirror Local storage high availability solutions Logical Volume Manager (LVM) is the software for logical volume management on AIX. The LVM itself provides Logical Volume (LV) data mirroring between multiple physical Volume (PV) to achieve local high availability of storage. Write I/O in the LVM Mirror scenario and the underlying device interaction

Project needs to build RABBITMQ high-availability cluster, recently in the learning and building process, recorded here can communicate with everyone (here is just a record of their own building process after learning, many of the principles of things not in detail). Build the Environment CentOS7 64-bit RabbitMQ 3.6.2 Keepalived 1.2.21 Host: 192.168.0.1 192.168.0.2 192.168.0.3 install RABBITMQ service on

Tags: business history automatic data src requires snapshot failover atiOriginal: SQL Server high Availability Technology summaryI. Replication replication (snapshot, transaction, merge)Application Scenarios:Load balancing, providing copy read, write operations.partitions copy historical data into other tables.Authorization to make the data available to anyone who uses it.Data merge.Fail over.Advantages:Simple to implement.The data is synchronized at

MySQL replication can ensure the redundancy of the data and read and write separation to share the system pressure, if the primary master replication can also be good to avoid the primary node single point of failure. But there are some problems with MySQL master replication that do not meet our real needs: A unified access Portal is not provided for load balancing, and if Master is down, it needs to be manually switched to another master instead of automatically switching.This article describes

MHA is currently a relatively mature solution for MySQL high availability, developed by the Japanese Dena company Youshimaton, and is an excellent set of highly available software for failover and master-slave upgrading in MySQL high-availability environments. During the MySQL failover process, MHA can automatically complete the failover operation of the database within 0-30 seconds, and in the process of f

consistency requirements are not very high, but also want to maximize the business availability of the scene. For businesses that have a high level of conformance to data, it is highly recommended that you use MMM as a highly available architecture.Mysql-mmm Advantages and Disadvantages Advantages : High availability, scalability, automatic failover, for master synchronization, at the same time on

MySQL replication can ensure the redundancy of the data and read and write separation to share the system pressure, if the primary master replication can also be good to avoid the primary node single point of failure. But there are some problems with MySQL master replication that do not meet our real needs: A unified access Portal is not provided for load balancing, and if Master is down, it needs to be manually switched to another master instead of automatically switching.This article describes

Tags: keepalived high-availability MySQL master-slave replicationDescription: Requires 3 nodes, master node (202.207.178.6), slave node (202.207.178.7), test node (202.207.178.8), virtual address: 202.207.178.4. Configure the MySQL database master-slave replication, and use keepalived to achieve high availability, can implement the primary database down, from the database available! mysql master-slave copy

Tags: mysql master master copy erro writer offline Aliyun program repos ref VIMMysql-mmm High Availability MMM introduction MMM (Master-master Replication Manager for Mysql,mysql primary master Replication Manager) is a set of scripts that support dual-master failover and dual-master daily management. MMM is developed using the Perl language, which is mainly used to monitor and manage MySQL Master-master (dual master) replication, although it