In computing, failover is automatic switching to a redundant or standby computer server, system, or network upon the failure or abnormal termination of the previously active application, server, system, or network. Failover and switchover are essentially the same operation, except that failover is ...

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324 views

Setting up a failover web server, off site

I've read so many articles, posted a few SF, but I can't find a solution that seems to cover everything. It doesn't seem as black and white as setting up and AD and installing DFS to replicate ...
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1answer
379 views

How can I solve the “split brain” issue with only 2 physical servers?

I have 2 physical servers, each will contain 2 VMs; a VM with Postgres (9.2) running, and a VM running some Python software (which will connect to the Postgres server). I'm not tied to anything in ...
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0answers
182 views

How to bind CIFS server to virtual IP in Windows Server 2012?

I'm a unix guy who is new to clustering with Windows. I have two Windows 2012 servers that have the StorNext clustered filesystem mounted as drives on each. If I try to add the File Sharing role, I ...
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1answer
28 views

How to set up always on server that directs between two URLs?

I have two urls: myurl.co.za myurl.net And a 3rd url: myurl.com Depending on different times of the day, I want users to be redirected to either myurl.co.za or myurl.net. I have a program that I ...
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2answers
325 views

Server 2012: how to plan for storage failover?

The Stuff I have the following components to work with: two rooms two beefy Dell R510s, one in each room two EMC VNXe storage devices, one in each room. The goal Ensure that if one server room ...
2
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1answer
267 views

SQL Server 2008 R2 Failover Clusters behaviour on multiple failures

I'm testing the resilience of one of our test systems. We have 2 x DB (SQL 2008 R2 on Server 2008 R2, running in ESXi VMs) arranged in a Failover Cluster. Shutting down the Active SQL Server service ...
2
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0answers
108 views

Solr on a two node Jboss cluster

Are there any issues with deploying Solr on two node jboss cluster with the index shared on a NFS mount point? We would like to do this for high-availability across data centers.
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1answer
232 views

What's the best way to run HAProxy backup as another HAProxy server and avoid cyclical issues

I have several geographical regions for my service deployment, say Region1, Region2, and Region3. Each region has a failover haproxy instance. Each haproxy is configured with several backend servers ...
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3answers
2k views

A-Record Failover?

I have a Fortigate 100D with 2x BT Business Infinity Fibre connections acting as WAN1 & WAN2. The BT lines come with 5 static public IPs each and I have my DNS hosted through CloudFlare pointing ...
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1answer
177 views

Is there a linux remote fs driver (nfs/sshfs/cifs/etc) that also keeps a local copy and fails over to the local copy?

I need to keep some static web mirrors synced in as close to realtime as possible, but I also want it to be somewhat fail-safe (or at least not obvious to the visitors), so if the file server goes ...
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2answers
277 views

MongoDB Failover Time

I have a MongoDB 2.4 replica set of six nodes and an arbitrator running in a test environment. I was testing the fail-over response time and it was around forty-five seconds. Keep in mind, reads are ...
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1answer
389 views

Xen XCP: Route failover IP to Guest

I have two hosts, which I installed XCP 1.6 on. The machines are hosted at Hetzner. Each host currently has a public IP and an additional IP assigned. There is a guest on each of the hosts which ...
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2answers
314 views

Failover Azure VM running SQL Server?

I'm currently looking at hosting an SQL Server database on an Azure Virtual Machine Instance and connecting the website via two load balancing web-roles. Due to various limitations in our application ...
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vote
2answers
636 views

One website, two public IPs, each IP on separate line, how to do failover

We have a website that sits behind two firewalls, main and failover. Main and failover firewall have different IPs, and different Internet connections from different providers. How to provide failover ...
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1answer
629 views

Tomcat Failover High Availability (active / passive)

we have a jee web application running on apache tomcat , we need to deploy this application on production environment and we decided to use failover structure so we have one server active and another ...
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1answer
1k views

keepalived 2 VIP and 2 servers

Is it possible to configure keepalived in a such way? In normal state VIP_1 assigned to SERVER_1 and VIP_2 assigned to SERVER_2 on server failure all VIP's going to working server, and after failed ...
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2answers
840 views

Setting up Hyper-V Server 2012 with active/active failover

I want to set up Hyper-V server according to the following: I want the Hyper-V server to, if both interfaces are up, to use the NIC connected to Switch A for storage traffic, and the NIC connected ...
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1answer
6k views

CentOS Dual WAN - Load Balance and Failover

I am setting up a Linux server (CentOS) to act as a router with load balacing and failover (when one internet line is down, another one should take over). The clients conected to eth1 ( LAN ) should ...
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2answers
61 views

Azure Table Storage mirroring

I am proposing an Azure environment with the following: VM SQL Server for core relational data Table Storage for bulk data I want to mirror the SQL Server database to another server so that ...
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1answer
1k views

nginx failover without load balancing

I'm having trouble with configuring nginx. I'm using nignx for reverse porxy. I just want to send my all requests to my first server. But if the first server is down, i want to send requests to ...
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1answer
249 views

Multisite WAN Failover

We are looking for a Debian Squeeze, opensource multi site "wan fail over" solution (apologize if a post for this exists - didn't see one). Multi site is key.... In a Small Office context, we want ...
3
votes
3answers
449 views

Haproxy on server failure event

I've got a setup with one HAproxy server (frontend) and multiple web-servers (backend). Is it possible to configure HAproxy so that a script is executed when a web-server gets down?
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1answer
2k views

Fail-over VPN with two ISPs and Cisco ASA 5500 Series

We have a couple of branch offices that need to connect to a main site. We plan to use Cisco ASAs 5515 to establish VPN connections. We would also like to have 2 ISPs at each location to make the ...
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1answer
223 views

Simple failover: Use NAT? (Network Address Translation)

We have a Windows Server 2008 server which needs very high uptime. We want failover in the event we need to take it offline for some reason, ex: hardware update, software update, etc. It runs mostly ...
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1answer
561 views

Exchange DAG fails over during backup

It seems like every night during our backup process, the Exchange DAG fails over. Is it possible to change a tolerance setting to prevent the DAG from unnecessarily failing over during backup times?
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1answer
601 views

Dual Linux NFS Server Failover - nfsv4leastime / nfsv4gracetime

first time here posting, i hope i won't do many mistakes. I've a setup with 2 NFS server. They're using corosync/pacemaker + drbd to offer active/passive nfs server. Distro used is Ubuntu latest LTS ...
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1answer
83 views

What is the easiest way to obtain a script-driven hot failover system?

I need to reconfigure a prod env to provide hot failover for a db driven web app written in Perl that is currently running on an Apache HTTPD server, on a Linux OS. The app is not designed to run in ...
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0answers
222 views

Unable to remote desktop using failover cluster name

I am using Microsoft Failover Cluster and I have 2 nodes - say node1 & node2. The nodes are successfully accessed by remote desktop. but the cluster name is not accessible. The cluster name is ...
2
votes
2answers
735 views

MongoDB replicaSet failover incurs 1000x query response time increase

I'm testing a production MongoDB replica set failover. When I manually fail one of the instances I see an approx. 1000x (one thousand x) decrease in response times of my PHP queries. I'm on the ...
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1answer
58 views

one website on 2 servers [closed]

i want to put my website on 2 servers, When server #1 is down, my site loads from server#2 . How can i do this? i want this 2 servers synced realtime... is there any software for this? or any trick? ...
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1answer
343 views

How to setup cluster of virtual machines to host web application with fail-over redundancy?

I would like to know how to setup a cluster of virtual machines to host a web application. We are expecting a high volume of clients connecting. I would like a cluster of virtual machines (or ...
0
votes
1answer
509 views

No Internet access after successful failover?

I am using pfSense 2.0.2 and want to set up a failover between my normal WAN connection (GW_WAN) and a 3G surfstick (GW_OPT8). I put both in a gateway group called WAN_FAILOVER: GW_WAN Tier1 ...
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4answers
163 views

Achieving Five Nines

I am building a web application where uptime is key. I understand that 100% uptime is not realistic but I would like to achieve five nines. I'm unsure as to the most prudent way to accomplish this. ...
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1answer
171 views

Using Amazon route53 for high availability

Using Amazon Route53 DNS, is it possible to build a highly available setup pointing to multiple web servers not on Amazon? I don't need to worry about session stickyness. Let's assume I have two web ...
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1answer
91 views

Is failover with only two servers possible?

I'm trying to set up a basic high-availability solution with HAproxy and mysql. Currently it looks like this In case of host1 failing, the host2 is supposed to get it's IP and traffic (using feature ...
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vote
1answer
500 views

Hyper-V Redundancy without Domain

We currently run a Hyper-V server on a non-domain W2008 server, and are looking to build a failover solution. Because all the (6-10) VM guests are linuxes, and our datacenter space is 90% non ...
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1answer
202 views

HA Options for Windows Servers

We are looking at different options to allow us to stay up and running when our primary datacenter (DC1) goes down for any reason. What is the main difference in having a offsite server updated all ...
0
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1answer
265 views

How to setup a failover solution for Windows 2003 SMTP Server?

I'm currently running Windows SMTP Server on a rented Windows 2003 Server VM. There are times when my hosting company network is down and my clients can't send their emails via the SMTP Server host I ...
2
votes
1answer
483 views

Linux HA Heartbeat Virtual IP Switching with domain name linked to it

I have heartbeat set up on two servers like so: Master: 10.15.1.50 Backup: 10.15.1.51 (Virtual IP: 10.15.1.52) So, the master always has 10.15.1.52 as well, but if it goes down, the backup will ...
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1answer
627 views

Hyper-V R2 can't add a teamed NIC as External Network

I have a Dell PowerEdge R710 running Windows Server 2008 R2 Datacenter and which was part of a Hyper-V Failover Cluster. It has 8x Broadcom BCM5709C NICs and three are teamed together to be my ...
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votes
2answers
67 views

Is a virtual IP assigned by a hosting provider?

I'm going to be setting up HA proxy with 2 physical servers, using heartbeatd. I'm going to have clients point domains to an IP address which can't change after doing so. My hosting provider has ...
3
votes
4answers
285 views

IIS: How do you handle Windows reboots?

We have one VPS (Windows 2008 R2+IIS7.5), with an asp.net mvc 3 application. The main question is: how to handle issues when Windows needs to reboot? (after installing Windows Updates or anything ...
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votes
1answer
103 views

Relying on shared disks for heartbeat

I read somewhere that using shared disks for heartbeats is reliable even if network totally fails. I read it in the context of remedy from split-brain. Is this correct? But I can not understand this. ...
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votes
1answer
104 views

Nginx reverse proxy: How to serve 'back soon' html file while backend server restarts

I have a WSGI server behind by nginx. Say I bring the WSGI instance down for maintenance/update, is there a nice way of nginx automatically serving up any requests to that application with a specified ...
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1answer
144 views

Software load balancing fail-over vs hardware [closed]

Please correct me, but my understanding is that with software load balancing a service must be run on each server while there is one DS that notifies the other servers that a server has gone down and ...
1
vote
1answer
643 views

DC/DNS failover with global/common DNS roundrobin

I think I am getting lost in network failover land. I am trying to set up a Windows Domain Controller and DNS, while providing resilients and failover. I have two Domain Controllers and DNS servers. ...
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votes
5answers
4k views

Many ISP's is block port 25, how do I choose an alternative port?

I am building an application that will be acting as a combined MUA/MTA on different networks. However, many of the networks are with ISP's that block port 25 for SMTP. Therefore I would also like to ...
0
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3answers
368 views

Apache failover for JBoss

I am running a JBoss web app (AS 6 Final) hosted on linux (Debian). I would like to implement a failover solution so that when JBoss is down, a static web page is served in its place. My current ...
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1answer
352 views

Nginx automatic failover

How do I setup Nginx on two machines so that if the primary machine crashes there is automatic failover to the 2nd machine? And what are the best practices here? There seems to already be a lot ...
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2answers
137 views

What is a reliable device to detect, from the outside, if my internet connection has gone down?

We host some web sites on servers in our office. We have two internet connections, a primary and a backup connection (with separate IP address ranges.) We need to be able to detect, from outside our ...