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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150 views

How to make Nginx fire 504 immediately is server is not available?

I have Nginx set up as a load balancer with cookie-based stickiness. The logic is: If the cookie is NOT there, use round-robbing to choose a server from cluster. If the cookie is there, go to the ...
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2answers
161 views

Windows Server 2008 DNS Forwarder Failover

When setting up and testing DNS forwarders I am finding that if the primary is unreachable 2008 will still try it for every query before trying the secondary. The default timeout before querying the ...
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1answer
215 views

DFS Replication Manager on Failover Cluster Nodes

I currently have a VM architecture setup for high availability / manageability. The one point of failure is that I have a single windows 2008 machine that runs DFS replication across the servers in my ...
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2answers
97 views

Hosts File Failover [closed]

My software uses DNS Name to connect to the Server. My Clients sometimes need to work off site and in such a case they use Hamachi to connect to the server. I would like to know if it is possible to ...
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1answer
119 views

mongodb on aws 2 region replication

I think I already have the answer, but I'm a developer so thought I'd check here first. There are AWS regions with more than 2 zone, but some with only 2. E.g. Sydney. Now if I were to deploy a ...
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2answers
127 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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0answers
520 views

XenServer IP Failover OVH not working

I have got problem on XenServer with IP FailOver in OVH. I did everything what is in this official tutorial http://help.ovh.co.uk/BridgeClient and IP not working. On my VM is Debian 7 64bit I set MAC ...
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430 views

Most VMS refuse to start

Setup: Virtual Host, running server 2012, hosting around 10 production VMs Problem: Last night, 2 VMs stopped with no warning, event log notification, or any information. The rest of the VMs on this ...
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206 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, ...
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1answer
1k views

Failover Cluster Client Access Point Only Responds to Pings on the Owner Node

Background We're running two VMs (Windows Server 2012 R2) on Azure with SQL Server installed, set up as an availability group. We also, of course, have another VM as a dedicated DC. These are all ...
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1answer
148 views

Which technique should be chosen for IP failover with manual control

I have the following setup, Linux stack, with front-end running nginx proxy and static assets and back-end running Ruby on Rails and MySQL in master-master replication: Primary site: front-end.a, ...
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2answers
70 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 ...
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2answers
105 views

how to recover from a failed web server or reverse proxy

I have the following setup in my datacenter. Global LB --> HA proxy (2 instances on different servers via VRRP, performs HTTPS termination, acts as reverse proxy) ---> Nginx(2 instances on different ...
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1answer
467 views

Nginx GeoIP load balancing with failover

I am attempting to set up a test Nginx load balanced environment. So far I have sucessfully configured a load balancer nginx-balancer1 and 3 servers to serve webpages nginx1, nginx2 & nginx3. I ...
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1answer
186 views

Configuring multiple Nginx load balancers for failover

I am attempting to set up a test Nginx load balanced environment. So far I have sucessfully configured a load balancer nginx-balancer1 and 3 servers to serve webpages nginx1, nginx2 & nginx3. ...
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2answers
417 views

Redundant routing (active/backup) on linux

I'm currently trying to setup a redundant routing on RHEL 5. The target goal is to have a primary route to a subnet and a backup route to that subnet, to be used only if the gateway of the primary ...
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0answers
72 views

IP Failover - Configured, but disabled

I have multiple debian servers on which I configured "IP Failovers" or "Floating IPs". My floating IP is 10.0.0.2 and I have an A records: www.example.com pointing to this IP. I configured this ...
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3answers
244 views

How much failover redundancy is enough? [closed]

I'm working on a client-server system where all clients currently submit their transactions to essentially a single west-coast IP address to reach what is called the "gateway" application. The ...
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1answer
93 views

ScreenOS Failover tunnel

I have a route-based vpn from my site (Netscreen204) to a customer site (Fortinet) . They want a second, backup tunnel in case of failure, and will be using the Fortune there too. The only thing I ...
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0answers
19 views

Is it possible to have VOIP and data share a common fail-over connection?

Internally, VOIP and data services are wired separately. They operate on two mutually exclusive networks, with separate broadband connections. Currently, there is no fail-over backup for VOIP ...
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1answer
443 views

MongoDB Failover Replica Set

I'm newbie to mongodb replica sets and sharding.. I am setting up IP Failover on two servers. I set up DNS failover at AWS route 53 to switch the IP address in case the main server goes down. I also ...
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2answers
405 views

Can Nagios monitor a service only by hostname?

I have two hosts server1 and server2 where I do manual fail over. The C record master-server then points to the one which is the master. Only the master host should have a certain service checked. It ...
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2answers
286 views

SQL Server Failover Cluster on Azure (HA Strategy)

In the context of SQL Server 2012 Standard Edition, is it possible to make Azure Blob storage available to a SQL Failover cluster directly as a shared SCSI resource on a Windows Cluster? An Azure blob ...
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2answers
464 views

How to handle IP's with manual failover?

I have two identical storage hosts where the master is the only one the users can access. If the master fails, then I want to manually change the DHCP address, so instead of master points to ...
2
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1answer
493 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 ...
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1answer
124 views

Automatic failover in SQL server alwayson availability group

I have 2 nodes in my SQL server fail over cluster. I use SQL server 2012 always on feature for HA purpose. The problem is that when one my server goes down the automatic fail over does not happen! ...
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0answers
388 views

keepalived - random re-elections

We have set up 3 servers running keepalived . We started noticing some random re-elections occurring which we can't explain so I cam here looking for advice. Here is our configuration: MASTER: ...
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1answer
38 views

database cluster fail over [closed]

I planed to develop a customized HA program for MSSQL, but I got a question when reading some articles about cluster. When master is down, then slaves vote for a new master, and the new master will ...
3
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1answer
77 views

High Available SQL Server without SAN by using AlwaysOn feature

I have two Microsoft SQL Servers (v 2012) and I want to make them mirror and when one of them goes down the second one will be replaced. AlwaysOn is a new feature in SQL Server 2012 that is ...
2
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1answer
32 views

Reserve Memory For Shell / Putty To Login When Server Is Overloaded (High Load)

I am currently trying to improve my failover strategies. Aside from adding a DNS failover I want to make sure I am able to log in via a shell Whenever the server is overloaded I am unable to log in ...
2
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0answers
42 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 ...
0
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0answers
109 views

Create a fail-safe private network between multiple cloud servers

I want to create a virtual private network between two or more virtual cloud servers, comparable to Amazon Virtual Private Cloud (Amazon VPC is not an option, as the servers are not hosted at AWS). I ...
2
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0answers
196 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 ...
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1answer
149 views

Failover clustering or Network Load Balance on windows server

I have 2 servers with Windows 2008 R2 standard OS. I need to create a cluster in case on of the servers goes down ; so the other one will continue provide services. The services we mostly use are a ...
2
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1answer
1k 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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0answers
53 views

FreeIPA issue: after ipa1 server kernel panic, not switching to ipa2 failover server

Our setup is as follows. All machines are running under Centos 5.8. We have a gateway machine with a firewall, gw.example.com, through which all external traffic is funneled. Behind it we have 2 ...
0
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2answers
245 views

web server redundancy in case of network failure

I have a (web) server at a datacenter, which at times (as all datacenters do) has network failures (for like 10-30 minutes). I have a second server at a different company (datacenter) which I could ...
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2answers
881 views

Failover for server with dual WAN

I have one mail server, one SonicWall firewall, two Internet providers, and an internal DNS server. I have WAN failover set up on the SonicWall so in the event that the primary connection is down ...
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votes
2answers
252 views

Hyper-V File Server Clustering - at my wit’s end [duplicate]

I am at my wit’s end with File Server clustering under Hyper-V. I am hoping that someone might be able to help me figure out this Gordian Knot of a technology that seems to have dead ends (like ...
2
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0answers
265 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 ...
1
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1answer
211 views

glusterfs mounts get unmounted when 1 of the 2 bricks goes offline

I have an odd case where 1 of the 2 replicated glusterfs bricks will go offline and take all of the client mounts down with it. As I understand it, this should not be happening. It should fail over ...
3
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1answer
1k views

Redis sentinel + HAProxy failover

I am looking to implement a HA redis implementation using Master-Slave redis servers. The web servers will connect to these through an HAProxy instance installed on each box. The situation is easy ...
0
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1answer
333 views

Proper management of PGPool II

Currently I have a site, with one Postgres database server. It is just for a select number of users (less than ten) but it needs the maximum uptime possible. I would like some kind of automatic ...
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votes
2answers
221 views

What is the best way to setup a heartbeat agent for failover between two VMs? [closed]

I have two VMs in VirtualBox that use NAT for their network adapters. They are both getting the same IP address, so I will need to reconfigure that; but knowing that, is it possible to set up a ...
0
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1answer
111 views

Failover server virtualization, what solution? [closed]

I currently have a web/mail server with mutiple virtual domains on it. I would like to run a failover server (all my dns are already on an failover ip), keep it in sync with the main server. Thus ...
0
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1answer
68 views

Server DR configuration

I have 2 Dell PowerEdge Servers, a Dell T310 and a Dell T320 - both running Windows 2008 Server. My main application runs on the T320 (with Raid 1 on the data drive - configured using Dell utility), ...
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2answers
123 views

Hardware failover of linux server without clusters or vm?

Any ideas on how to provide complete failover for a SLES11 installation without implementing clusters or vm? The applications that are running are not (and will never be) cluster aware. There are ...
0
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2answers
4k views

nginx reverse proxy - try upstream A, then B, then A again

I'm trying to set up nginx as a reverse proxy, with a large number of backend servers. I'd like to start up the backends on-demand (on the first request that comes in), so I have a control process ...
1
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2answers
136 views

Any software/proxy that can do SMTP failover?

I'm using a monitoring software that sends out email to my ISP's mail server (SMTP Server). But sometimes, the ISP's mail server goes down, or takes too long to respond, I would like to find out if ...
0
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0answers
108 views

Limit Devices on SonicWall FailOver Connection

We'd like to use a SonicWall to configure a failover Internet connection that will likely use a Verizon 4G "jetpack". We don't anticipate having to use this very often but when we do we are concerned ...