webpass availability

Environment Introduction Operating System: CentOS6.5 _ x64 miniLoad Balancing mode: DR (direct routing)Brief description of LVS and Keepalived:LVS is short for Linux Virtual Server, which is a Virtual Server cluster system. The cluster technology and Linux operating system are used to implement a high-performance and high-availability server with good scalability, reliability and management.The LVS cluster uses IP Server Load balancer technology and

High Availability is a key requirement for important database applications. IBM DB2 9.5 provides many features to meet this requirement. If you are not familiar with DB2 on the distributed platform, or have been using it for a while, you may find this set of processing availability features confusing. When to use which feature and what target do you want to accomplish when to use it? Before getting started,

This article is from DBAnotes. Original article title: DRBD and Pacemaker If someone asks you if a PC server can reach 99.99% high availability, what should you do? Maybe no machine can "Make sure" to achieve this availability. Of course, there may be no problems in a certain period of time, but it must be luck, however, high availability is basically impossible

Build a high-availability cluster in CentOS 7 This article uses two machines to implement dual-collector for high-availability clusters. the IP address of the Host Name node1 is 192.168.123168, And the IP address of the Host Name node2 is 192.168.123169.1. Install cluster Software Software pcs, pacemaker, corosync, fence-agents-all are required. If you need to configure related services, install the corresp

Nginx + Keepalived for High Availability of hot standby Preparation: The two ip addresses of the machine are 192.168.100.128 192.168.100.129 (you can use a virtual machine for testing. The Network Mode of the virtual machine is NET and the static ip address is used) Prepare a virtual ip address to provide external services, that is, access the web application through the ip address. (Keepalive binds the virtual ip address to two machines.) the core pr

The main implementation is a high-availability server Load balancer web server cluster, suitable for lamp architecture. The front end uses two servers as The lvs + keepalived load scheduler. N servers can be used as the apache + php application server in the middle, and the next two servers are used as the mysql high-availability dual-machine, finally, a virtual machine is used as the file server. A total o

Nginx Server Load balancer dual-host High Availability If the Web server cluster is used as a city pool, the load balancing server is equivalent to the city gate, and its importance is self-evident. If the "City Gate" is closed, the access to the outside world will be broken. If a server is balanced, when the server fails, the whole website will be inaccessible. Therefore, we need more than two servers to achieve failover and high

Tag: IP Address server server virtual machine equalizerFunction:Lvs+keepalived in a high-availability load-balancing cluster:· Keepalived is responsible for back-end real server Health CheckIf a real server service fails, it is removed from the Cluster service, and then automatically joined to the cluster after recovery.· Keepalived is responsible for high availability of the load Balancer (directory server

This chapter describes how to build a mirrored database based on a previous single back-end DatabaseThe Lync Server backend is the SQL Server database, and the back-end high availability differs from the previous high-availability configuration followed by Lync Integration.High availability is an architecture that continues to provide services in the event of a h

Xen-server for single-point failover High Availability (HA)Create a new resource pool (the pool in this place is the server Xen-server pool)650) this.width=650; "height=" src= "http://a3.qpic.cn/psb?/594581eb-e62e-4426-a878-953c87dd5729/* shhfudflmmuj6cyulqkfinqlzgvpdx5erq0qjlcrke!/b/dgybaaaaaaaaek=1kp=1pt=0bo=igfjaaaaaaadae8! su=0202829665tm=1481868000sce=0-12-12rf=2-9 "width=" 289 "style=" margin:0px;padding:0px; border-width:0px;border-style:none;v

This article mainly discusses perforce's * Perforce centralized authorization * Perforce's support for Distributed teams * Server Load balancer and scalability of perforce * Perforce high availability and disaster recovery One perforce centralized authorization Currently, in many large companies, different departments have different p4servers, which leads to the simultaneous existence of multiple p4servers in the company, as an admin

11.6 Designing High Availability SolutionsConsiderations for 11.6.1 PlanningThe following two factors need to be considered when planning for high availability:RTO (Recovery time Objective, i.e. target recovery times)RTO indicates how much downtime the business system tolerates each time. If the business stops too long, the loss will naturally increase. For particularly important business systems, it may be necessary to use multiple technologies at th

I have previously written a heartbeat-ldirectord to achieve high availability of LVS. Here, a lightweight program keepalived is introduced based on vrrp protocol, which can also provide high availability for services, this program was originally developed to provide high availability for LVS. Next, let's take a look at how to use keepalived + ipvs to achieve hig

interaction objects makes the relationship between people and interaction objects more reasonable, so as to get along with each other. Availability)It is the basic and important indicator of interaction design. It is the overall evaluation of the degree of availability. It is also a quality indicator that measures whether a product is effective, easy to learn, secure, efficient, memorable, error-free, and

then configure/etc/keepalived. conf. You only need to change the annotation part. 4. Set gateways on two real servers respectively Set all gateways to 192.168.10.10. 5. Configure HTTP in two realservers [[Email protected] ~] # Yum-y install httpd[[Email protected] ~] # Cd/var/www/html/[[Email protected] HTML] # Cat index.html[[Email protected] HTML] #/etc/init. d/httpd startThe configuration of another machine is the same, and the process is omitted. 6. Run service keepalived start on

Through this article, you will learn about DB2Hadr functions and basic operating principles, you can quickly configure an hadr environment through an instance and perform some simple functional tests. Next we will discuss some technical points of hadr.Discuss in detail and give some suggestions. If you are considering the HA issue, I sincerely hope this article will help you. DB2 hadr Overview High Availability disaster recovery(Hadr) is a dat

Keepalived + nginx high-availability environment, keepalivednginx There are actually many high-availability solutions, and the cost is very low and simple. For example, if you have a website, the simplest high availability is nds + nginx + two machines. Because we are a customer's project, dns application is very troublesome, so we need to consider using keepaliv

Deploy a robust high-availability layer-7 Load Balancing solution based on keepalived + nginx 20151214 High Availability is a common topic. Open-source high availability software has been developed quite well. Previously, it has done lvs + heartbeat 4-layer LB In debian, it has been very stable (unfortunately, the traffic is not large). Now, due to business needs

LVS + Keepalived for high-availability Load Balancing I. Principle 1. Summary if you divide TCP/IP into five layers, Keepalived is similar ~ Software with layer-5 switching mechanism, with 3 ~ The layer-5 switching function is mainly used to detect the status of the web server. If a web server fails, Keepalived will detect and remove it from the system, when the web server is working normally, Keepalived automatically adds it to the server group. All

services.After splitting the service is usually stateless, session management and so on usually to the gateway layer, or unified SSO services, business services to eliminate the complexity of session management, improve service efficiency;The split service supports distributed multi-instance deployments to scale on demand, enabling rapid, on-demand scale-up, such as marketing campaigns, to increase the availability of your site as you respond to sudd