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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502 views

Externally hosted proxy server as frontend to internal HTTP server

I will explain the problem first ... I have an in-house webserver/web-app that is publicly accessible. Our Internet connection (Bonded ADSL MAX Premium) is therefore a single-point-of-failure (which ...
2
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2answers
3k views

Redis high availability and load balancing

I'm using Redis for some time and now we want to move to a redundant cluster which would be fault tolerant, highly available and load balanced. I principally use Redis for some PHP web application ...
2
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2answers
105 views

Multiple DNS servers for website failover

I know this is a bad "solution", if its even one, but due to the circumstances I think it fits. If Server A runs ns1.example.com and Server 2 runs ns2.example.com and both are hosting an exact ...
2
votes
2answers
919 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 ...
2
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2answers
273 views

How to secure app on Heroku against another big outage?

After the 16 hours downtime of Heroku and AWS we're thinking of how to make our website stay up even when heroku or AWS are down. Is there something better than just backup the app every 5 minutes, ...
2
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1answer
2k views

How to build true HA cluster using Ubuntu Cloud or other virtualization options

We need to set a fault tolerant solution for a VOIP application preferably using Linux clusters. The application will reside on server A and an identifically configured server B will act as fail over....
2
votes
3answers
1k views

Aggregate multiple WAN connections (DSL, WiFi, WiMax) with a static IP, without BGP

Is it possible to use two VPN or MLPPP routers to aggregate, load balance, or fail over between WAN connections from a number of different providers? Two conditions: 1. We need to keep the external ...
2
votes
1answer
456 views

IIS7 failover cluster across datacenters

I have servers in two different datacenters with each datacenter getting static IPs. What I would like to do is setup the servers as IIS7 servers and allowing them to failover from datacenter to ...
2
votes
2answers
651 views

Regarding active/passive failover, what utilities exist?

I am about to configure two Nagios servers with one being a hot-standbye or failover unit. It will periodically check the active Nagios server and will need to steal its IP addresses in the case of ...
2
votes
2answers
2k views

How to setup IIS7 and SQL Server failover on a Windows Server 2008 R2?

We would like to ensure minimal down time for our hosted software, which is .NET and SQL Server based. We would like to setup a multi-site cluster so we would have two servers at geographically ...
2
votes
2answers
444 views

tools for geographical redundancy

I'm writing a spec for a high availability application. I need a low budget solution to be able to failover between two data centers. Replicating databases and content I'll be able to manage solutions ...
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2answers
448 views

When to employ server failover in a virtual environment

This question kind of got me thinking about fault tolerance in DHCP, so I did a little digging in my current environment and discovered that we only have 1 DHCP server per major site in our company ...
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1answer
1k views

HyperDB Configuration Master/Slave

Running on server 2008 R2 IIS 7.5, with a MySQL Master/Slave (also on server 2008 r2), and WordPress 3.7. Is it ONLY compatible with wordpress 3.5.2? If that is so is there any other plugins to allow ...
2
votes
1answer
3k views

KeepAliveD, Rackspace Cloud, Unicast - both LB's enter MASTER state…?

I have set up two HAProxy Load Balancers in an Active->Passive pair. KeepAliveD will be used for failover between MASTER and BACKUP servers. Like most clouds, Multicast is not supported so I cannot ...
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1answer
2k views

DHCP failover with isc-dhcp-server using two secondary servers

I'm rearranging our network and putting some DHCP failover since we have a lot of machines, and even servers, getting IP addresses with DHCP. Today we have a nice DNS topology with one master server ...
2
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1answer
781 views

VPN Failover Cisco ASA 5505

So basically we have a Cisco ASA 5505 (we have inherited this from a customer, none of us have any experience with Cisco's). Now essentially we have to WAN lines which we have setup in Failover, via ...
2
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2answers
156 views

Performance penalty when using CNAME

We are using the current CNAME record for a server, i.e. foo.example.com => CNAME => server1.example.com server1.example.com => CNAME => ec2-34-142-138-31.compute-1.amazonaws.com ec2-...
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1answer
2k views

keepalived 2 VIP and 2 servers

Is it possible to configure keepalived in such a 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 ...
2
votes
2answers
942 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 ...
2
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1answer
617 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 ...
2
votes
1answer
1k views

Best failover strategy for e-mail servers on AWS to ensure high availability

We have our e-mail server hosted on AWS. Last week Amazon had a failure in their East Coast region which brought down our server along with many others. We now want to implement a failover strategy ...
2
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2answers
173 views

Ways to do simple failover with one server and two IPs

The setup is one server (Windows 2008) at one location with two incoming connections. As the server has to interface with various on-site devices, and will have a small number of incoming connections,...
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2answers
2k views

DNS failover across multiple datacenters?

I've got a site that is starting to get a lot of traffic and just the other day, we had a network outage at the datacenter where our loadbalancer (haproxy) is hosted at. This worried me as despite all ...
2
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1answer
143 views

Failing back from DNSSec to regular DNS

A disaster recovery plan has been proposed in a client's company that would fail back from DNSSec to regular DNS in the event of 1) A major site outage requiring the change of many DNS records 2) ...
2
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1answer
2k views

heartbeat: Bad nodename in /etc/ha.d//haresources [node1]

I'm trying to start heartbeat on Ubuntu 10.04 with service heartbeat start, but getting the following errors: heartbeat[24829]: 2011/11/22_19:31:07 ERROR: Bad nodename in /etc/ha.d//haresources [...
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1answer
644 views

Is it a bad idea to use RAID 1 and NBD to create a mirror of a disk for failover?

What I wanted to do is to create a mirror of one machine's disk on a failover machine so that, in the event the primary machine failed, I would just reboot the failover, select a different root ...
2
votes
3answers
72 views

How can I set up temporary failover for a “write-only” smb share?

I am tasked to set up a storage server which will be used to "receive" data from an Illumina machine running very expensive DNA sequencing operations with limited interruptibility. The sequencer ...
2
votes
1answer
3k views

Configuring Secondary DNS to Work if Primary is down (Bind)

I have a master slave DNS server setup with bind. The secondary DNS server is working correctly and resolves any queries sent to it. However, when the primary DNS is down, it seems that the secondary ...
2
votes
1answer
331 views

Change hostname on linux ha failover case

I have configured two machines to do a warm standby so that machine 2 can take the ip of machine 1 if that should fail and become its replacement. sadly, thats not enough, i need to change the ...
2
votes
3answers
1k views

Monitoring an ISC DHCP Failover Status Using Nagios

I recently implemented ISC DHCP Failover and it's working beautifully, but I'd like to monitor the current status of the failover using Nagios. Ultimately, I would like my Nagios check to: report ...
2
votes
1answer
756 views

Failover/redundant SSH

I have an SSH server where multiple clients SSH in to maintain a bunch of port forwards. What I want to do is, if the server goes down, have the clients automatically connect to the next server. The ...
2
votes
3answers
2k views

Is there any open source solution for failover of incoming traffic?

We have two ISP's and both ISPs' IP NAT with the same webserver IP. I want failover for incoming traffic, is there any open source solution? Can I do it by making two name servers, one for each ISP? ...
2
votes
1answer
533 views

Intermittent unavailability of an instance in a failover cluster while a standby node is offline in a SQL Server 2008 failover cluster

I've got a small failover cluster that I run for the websites my company has. During a RAM upgrade of the standby server, our websites started to show errors about not being able to access the ...
2
votes
2answers
684 views

Configure Hyper-V Server 2008 R2 Failover Cluster from Windows Vista

How do I configure Hyper-V Server 2008 R2 Failover cluster capabilities? Can I use mmc from a vista system or do I have to use Powershell?
2
votes
1answer
722 views

EC2 database server failover strategy

I am planning to deploy my web app to EC2. I have several webserver instances. I have 1 primary database instance. I have 1 failover database instance. I need a strategy to redirect the webservers to ...
2
votes
1answer
329 views

TFS failover options for single server?

What are people using for TFS (2005) failover when using a single server configuration? It seems that most help docs from MS are about dual config (app and data tiers). In fact I found a msdn blog ...
2
votes
1answer
402 views

How to set up ARR in active/passive (aka failover) mode?

The Problem I am trying to configure several web farms (for different sites) following the NLB+ARR architecture. Let's say I have 6 VMs: ARR+NLB cluster of 2 VMs. It receives traffic and forwards ...
2
votes
0answers
140 views

DHCP Failover works but no DNS available

I have a DHCP failover (load balance) configured. DHCP failover works but the clients are not getting any DNS entries. We have 2 DNS servers using AD-integrated zones, and the failover is between ...
2
votes
0answers
735 views

Error getting the list of sites from the target environment: An invalid dn syntax has been specified

Trying to add another (second) Domain Controller to an existing Domain. In the second step of "Active Directory Domain Services Configuration Wizard" getting the following error: Error getting the ...
2
votes
0answers
570 views

DRBD + corosync + pacemaker - Servers won't connect after failover

I got 2 servers configured with drbd, corosync with pacemaker. It is all working fine, primary server gets secondary if it fails, and secondary gets primary. But if the 1st server comes up again ...
2
votes
1answer
51 views

Website failover across internet connections

Requirement For a network having 4 static IP internet leased line connections linked to hosting a website. What are the current strategies one can apply to ensure high availability in case of ...
2
votes
0answers
554 views

Dreamhost DNS to AWS Route 53

I'm looking to setup DNS failover for config.webconverger.com and I think Route53 is the best option to get it going. However I'm confused how to export the DNS zone from Dreamhost to Route 53, ...
2
votes
0answers
49 views

Failover web hosting with multiple NS

Are there any drawbacks in having each nameserver entry in a domain name point to different failover server? In this setup, the same DNS server will also serve the content - so if it's down, the ...
2
votes
0answers
384 views

Keepalived failover not working for Static NAT target behind Cisco ASA

I've got a Cisco ASA[0] with a pair of Linux boxes in the DMZ running Keepalived and HAproxy acting as a load-balancing failover pair for another pair of Windows servers, also in the DMZ. I'm ...
2
votes
0answers
727 views

TeamCity (or Jenkins) with Cluster/Replicated servers

We use Team City 7 for Continuous Intergration. Sometimes I need to bring down the server for maintenance which stirs up complaints. Is anyone using a cluster for these types of servers where there ...
2
votes
0answers
739 views

Openldap Mirror Mode replication failover

We have currently one master ldap server and around 400 slave servers which are partially replicated through that master.All openldap versions are same and 2.4.31 What we want is actually if master ...
2
votes
1answer
375 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
votes
0answers
147 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.
2
votes
0answers
479 views

JBoss: switch domain in case of failure

In a cluster configuration of 2 different physical servers, managed with the domain setup, where one of the servers is the master and acts as a domain and the other is the slave and gets the ...
2
votes
2answers
176 views

DRBD(-alike) solution to enable failover for spool files

Im about to setup a failover-setup for our Kannel service using hardbeat and DRBD. One machine is the primary one, when that one dies/goes down, it switches to the secondary. Kannel is using a spool ...