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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256 views

Can HAProxy reconnect a websocket to another backend server transparently?

I'm new to HAProxy so this might have an obvious answer but I wasn't able to find it. Consider this setup: two backend web applications; one HAProxy in front of the web applications; many clients ...
1
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0answers
152 views

Keepalived configurations

I installed keepalived on two firewalls to provide fail over. I'm not sure if the following configurations are correct (see configurations below). Sometimes I have problems to reach the websites ...
0
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1answer
142 views

Hosting self hosted WebAPI in Windows Failover Cluster

I've got a windows service that is self-hosting the Asp.Net WebAPI. This works great and I can send GET requests successfully. However I am also trying to host this service in a Windows 2012 ...
0
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0answers
62 views

Windows 2008r2 Failover GeoCluster Quorum Votes

Windows 2008r2 Failover Cluster with SQL 2012 always on Geo cluster. I have: 2 nodes setup with equal nodeweights = 1 DFS Witness has a nodeweight of 1 equaling 3 Votes for the cluster. setup ...
2
votes
1answer
33 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 ...
1
vote
1answer
767 views

pfSense failover and OpenVPN site-to-site

I have two pfSense Clusters, and am trying to connect them with an OpenVPN site-to-site VPN. Initially, the client was a single pfSense system, and all was well. Now that one system is a cluster, and ...
0
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1answer
288 views

Active-passive xenserver bond availibility after stacked switch failure

Citrix documentation for Xenserver recommends that when physicals NICs participating in an active-passive bond, need to be connected to different switches, the switches must be stacked.. Would the ...
8
votes
5answers
717 views

Hot spare host vs cold spare host?

We have several hosts where we have an identical hot spare host, which is patched and updated so it is very close to have to same software and config. In case of failure the network cable is switched ...
0
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1answer
51 views

Supporting writes on bind9 failover

I want to set up a redundant DNS based on Bind9, including failover for write operations. I have DHCP dynamically update DNS based on client hostnames, and I need this functionality to continue to ...
0
votes
3answers
1k views

XenServer HA (failover VM's) without shared storage

In the university from Uruguay where I work, we have 2 IBM BladeCenter S with 4 server blades each one. Each blade have XenServer 6.2 installed and working. Our idea is have each BladeCenter in ...
0
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1answer
522 views

Apache mod_proxy_balancer + Tomcat load balancing - Should not redirect until web applications are ready

I am using apache2 mod_proxy and mod_proxy_balancer to balance the load to 4 seperate tomcat8 instances on different servers. I am using different AJP ports for each tomcat instance and using jvmRoute ...
0
votes
1answer
180 views

Redirect PowerDNS on Failure

I've been searching around, but cannot seem to find an answer so I apologize if this has been asked here before. I had two PowerDNS servers - ns1 and ns2 (which are in different datacenters). Both ...
0
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1answer
447 views

HDFS' ZKFC service unable to start

Introduction CDH4's ZooKeeper Failover Controller (ZKFC) has been installed. Starting the ZKFC service: [vagrant@localhost ~]$ sudo service hadoop-hdfs-zkfc start Starting ...
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3answers
69 views

One domain hiding two servers

For our SaaS web-app we have two identical servers in two geographically separated data centers. FOO_1 is the production server and does real-time (MySQL master-slave) replication to its backup ...
1
vote
1answer
178 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 ...
1
vote
2answers
210 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 ...
1
vote
1answer
328 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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votes
2answers
115 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 ...
0
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1answer
147 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 ...
2
votes
2answers
143 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
583 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 ...
3
votes
1answer
535 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 ...
1
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0answers
247 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, ...
1
vote
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 ...
0
votes
1answer
171 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, ...
2
votes
2answers
80 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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votes
2answers
120 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 ...
0
votes
1answer
501 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 ...
1
vote
1answer
201 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. ...
1
vote
2answers
515 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 ...
0
votes
0answers
85 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 ...
3
votes
3answers
281 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 ...
0
votes
1answer
120 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 ...
0
votes
1answer
566 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 ...
0
votes
2answers
526 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 ...
0
votes
2answers
355 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 ...
4
votes
2answers
511 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
votes
1answer
569 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 ...
0
votes
1answer
145 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! ...
0
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0answers
441 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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votes
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
votes
1answer
81 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
votes
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
votes
0answers
45 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
votes
0answers
118 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
votes
0answers
235 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 ...
1
vote
1answer
152 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
votes
1answer
2k 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 ...
0
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0answers
54 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
votes
2answers
321 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 ...