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Questions tagged [failover]

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 automatic and usually operates without warning, while switchover requires human intervention.

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How to setup Nginx container load balancer failover

I am creating an API application which I want to deploy in the cloud and my application is made up of the following containers: Nginx Container: API Gateway API container SQL Server Database ...
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KeepAlived service running but does not executes the check haproxy script

I have configured a failover load balancer, so that it acts as a backup whenever my primary goes down. So I have setup Keepalived that switches the floating virtual IP address to the other machine ...
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Binding multiple IP on single listen throws error in HAProxy

I have a LB which is redirecting request in a round robin mechanism to my 4 servers configured. I have assigned a floating IP address(LOADBALANCERFLOATINGIPADDRESS) to the machine. Now I want my LB to ...
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Unable to access web service with floating IP address assigned to my machine

I have a machine for which I have assigned a floating IP address. That machine is also my load balancer. I can access my service easily using the IP address of load balancer. However I am unable to ...
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Automatic redirection to static error site if web server is unavailable

I was reading an article about warm recoverable web server with Compute Engine and Cloud Storage. Normal scenario: Failover: Documentation states that: In an outage, you update the external HTTP(S) ...
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How to implement backup link via VPN

I have a PTP wireless network from one location to another and it is working well. I would like to have a VPN backup in case it should ever go down. How can I make this happen automatically? I am ...
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howto make nginx with failover with containers that potentially don't exist

I would like to use Nginx in front of a number of dockers containers, some of which (known) may be missing. Make sure that nginx does not block on "host not found" and stop the container ...
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DHCP server failover with dynamic bootp range declaration

I am trying to configure a failover for a ISC dhcp server running on Linux that has dynamic-bootp range declaration. The configuration file looks like this (I am trying it locally first, therefore ...
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Identifying current main DHCP server

There are two DHCP server of the same IP address example.(10.100.9.12 and 10.100.9.13). The gateway, subnet mask, and DNS is the same. The current DHCP are running on Vlan9. Is there any possible way ...
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Generic high availability abstraction for application possible? [closed]

I am currently examining the possibilities to make our existing server application highly available. The software handles messages that come via UDP resp. some higher level railway-specific protocols. ...
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Windows Server Failover Cluster (File Server)

I am planning to create a windows server failover cluster for file server. However, I do not have any shared storage available which I can connect to the cluster. Is there anyway to use the local disk ...
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mirror cluster replication software

I'm looking for an alternative to the safekit software which handle high availability using active/passive redundant servers with real-time replication and failover. Actually we have 2 distant servers,...
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A CNAME pointing to 2 different A Records set up with Primary/Secondary Failover Routing?

Considering records like: host.example.com as a CNAME to: host01.example.com and host02.example.com (on two separate records). I want to set up those A records to be with a Failover routing policy. ...
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HAProxy 2.0 - retrying some of the requests based on URL

I have HAProxy version 2.0.14 installed, and I'm looking for a peculiar use-case which I haven't yet managed to configure correctly. Basically I have a frontend which listens on a port, and two ...
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How to setup a failover server with KVM and DRBD

I have a server that I am virtualizing using the Virtualizor control panel. I need to set up a failover server that syncs everything on the first server to the second server. I am using DRBD to sync ...
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Cross update on server failover

What should be the strategy on server failover and need to cross update. Example; primary server stream live data on Secondary server and incase of failover if traffic move to secondary and database ...
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Suitable configuration for failover for ISP diversity?

My Internet connectivity is currently via a DOCSIS cable modem in bridge mode. It's supplied by the ISP and I can't do much to change its configuration. The link is not very reliable, it's prone to ...
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AWS Route 53 Failover DNS with Healthcheck not updating IP (even though health check shows failure)

Our goal is to have a Healthcheck continuously evaluate the health of an endpoint. When it becomes unhealthy, we want the DNS to failover to a different IP address. We have set this up but we now ...
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How long does it take to failover with oVirt/RHEV?

I'm trying to get a better understanding of what is achieved by using RHEV/oVirt (or other OSS solutions) in an HA cluster. I'm interested in knowing how long it takes to fail over, and what exactly ...
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Cannot Implement Failover Clustering Windows Server 2019

I am learning how to implement a failover cluster. I have 3VMs running Windows Server 2019 Standard Edition on all the VMs and it is not activated. I installed failover cluster feature on all the VMs. ...
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Windows Disk Cluster for Hyper-V Failover Cluster

Looking for design assistance. Typically, I use a 2 node SAN disk cluster running CentOS and DRBD for high availability. I will then connect the hypervisor(s) via iSCSI; sometimes KVM/QEMU, sometimes ...
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2x Windows Server for 2 labs in different parts of a building - what kind of failover to use

I have two servers and two labs in different parts of the building with Hyper-V 2019 with VMs for Windows Server Standard (2012 R2, will be upgrading in a few years). I want to: configure ServerA for ...
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Veritas Cluster nodes reboot when another is reset or hard turned off

We are conducting bi-yearly resiliency test on a 4 node VCS cluster. With two applications running on nodes 1-3 and 2-4 resp. in active-standby mode. When making a manual switch over, or a graceful ...
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moving ip of one VM to another VM

I've hosted two VMs on the same machine, one is active in nature i.e. hosting a service and is connected to a client (client is running directly on the host machine). I've to implement a fault ...
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What is the best way to handle DNS and failover management for a subdomain website when I don't have control of the domain?

Updating DNS for this subdomain would take hours or days, but we'd like to be able to set up a reliable auto-failover mechanism that I think would require faster DNS changes. What is best practice for ...
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Servers Redundancy/Fail over in different locations

One in a different city. These are individual servers, pretty much works as file servers. We upload images to those servers and at the end of the month we send the images to our clients (...
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How to configure failover cluster to register its records automatically after it deleted from dns server?

I have failover cluster with 2 nodes .Both nodes have windows server 2016 and i was configured DNS Aging and Scavenging (Cleanup Stale DNS Records). But unfortunately cluster name and listener dns ...
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Switch to failover IP instead of main IP for all HTML requests?

I'm using Centos 8 and with my luck, my main IP is blacklisted on an API I'm trying to use. I have 3 failover IP addresses however. Is it possible for me to use one of these failovers instead?
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Query to get the failoverCount and lastFailover in a Windows Failover Cluster

Anyone know of a command or PowerShell script to get the current failoverCount and lastFailover datetime in a Windows Failover Cluster? I have a 2-node cluster that doesn't automatically failover ...
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Single isp dual failover links

I'm having a problem trying to configure my cisco 3945 router to use a dual hand-off wan links. Lets say the ISP has provided the below ip addresses where they are doing hsrp at their end ISP EDGE 1 ...
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SQL Server 2012 AAG not failing over in case of SQL Server crash/stop

I have created the following structure: Two hardware servers with Windows Server 2012R2 installed, SQL Server 2012R2 installed. Then Windows went fully updated and SQL Server was patched to SP4, ...
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Website fail over using 2 IP address

We have a moodle webserver with 2 Public IPs (different ISPs). Is it possible to make a mechanism, to access the website with other IP, if the first ISP connections fail? We have added 2 public IPs in ...
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how to view old events in failover cluster manager

In failover cluster manager > cluster events, i have only for about 12 hour of events. I wish to view older ones or maybe how to make the manager show more than that.
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Enable Windows Failover Cluster With Zentyal Active Directory

currently i have one domain controller with zentyal (Community Edition). And i have 2 node already connected to domain. So i setup Windows Failover Cluster, but i always got failed validate with ...
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Validation Failed On Windows Failover Cluster Access Denied

i have 2 node will be setup windows failover cluster. every node already connect to Active Directory. when i validate on windows failover cluster, still failed on List Disk error message like this
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How can I fail-over my website domain?

I have two web servers running on a different location with different static IP: WebServer 1: x.x.x.x Webserver 2: z.z.z.z Both servers should point to test.com domain. Let assume currently, Master ...
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ASR failback fails because boot type UEFI

Our on-premises environment is VMware running Windows Server virtual machines. We are using Azure Site Recovery (ASR) to replicate some of our VMs to Azure. I have been doing some failover/failback ...
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SQL Server fails over while vmware virtual machine backup

Recently we moved clustered SQL Server 2017 running on Windows Server 2016 from physical to VMWare, since then everyday it started failing over at same time. No Error in SQL Server logs but Windows ...
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2 Node -- KeepaliveD -- network break

I have a two node ( VMs ) setup running keepaliveD. The problem is that due to only ability of managing the VMs from command line, I can't demonstrate how the network break between both node-A and ...
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Failover cluster of 2+ servers for disasters with only 2+ physical machines

TL;DR: Question in bold below Here http://www.howto-expert.com/how-to-create-a-server-failover-solution/ is an (I assume) old blog post, explaining how to setup 2 server machines (one master and one ...
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Failover between two internally hosted, geographically seperate web servers [closed]

We have a web application hosted on an internal windows vm. Our company has a number of bases around the country, each with it's own server rack, and the base LANs are linked together in a big ...
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1 vote
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Using floating IP for load-balanding OpenShift/OKD control plane

On-prem OpenShift installation requires load-balancer over the control plane, and does so already for installation. Now this cluster will be local, with the control plane only accessible inside ...
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Why aren't inherited scope options replicating between Win2019 DHCP servers in a failover config?

I have 2 Win 2019 DCs, both running DHCP servers with a scope configured for failover. If I explicitly set scope options on one, they properly replicate to the other server. But options inherited from ...
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Cost reasonable failover architecture between 2 datacenters [closed]

I would like to get your thoughts on an architecture to handle failover between 2 application servers hosting multiple applications (.NET based websites, SQL Server) in Switzerland. The goal is to ...
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You do not have administrative privileges on the server Failover Cluster

I am trying to setup a 3 node Failover cluster in Azure. The below is my configuration: Region: West Europe VM Size: Standard D2s v3 Storage: Premium LRS Data Disk: 2 numbers, 128 GB OS Disk: ...
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Gateway failover

I have an Ubuntu server acting as a gateway for inbound internet connections. This server shut down unexpectedly because of overheating and lost all internet connections during business hours. How can ...
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Dedicated server in OVH - IP failover not working

I have server in OVH. I buy 13 IP blocks, added to server but ip not working. My step: I added new IP block 151.80.170.164/30 to my /etc/systemd/network/50-default.network, i added this line [...
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Windows implementation of keepalivd?

Me and my team have been trying to find a solution to the following setup: Two physical/vm machines with their own memory and network devices. One will act as master the other slave. A virtual IP ...
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Simplest way to setup a failover web server

So I have a simple web app (LAMP) , minus (MySQL) , that stores user generated data into files (think photos, audio etc). I want to setup a failover webserver what's the easiest way to do this? ...
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pacemaker IP and MAC failover

I am setting up a system with two redundant servers, where one is an active one. If the active server goes down or is not reachable the other server has to become active. All the services are ready so ...
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