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 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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Azure Application Gateway probes failing with CN mismatch even for http

I've set up an Application Gateway with frontend https settings (using a wildcard cert from Letsencrypt) and backends just using http. When I try to set up a probe that derives the address to probe ...
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Squid taking 2 minutes to fail over between parents

Squid Version 3.5.27 running on Ubuntu 18 VM. Certain applications are only accessible via our on-prem data centers, so as a work-around we configure a parent cache for internal domain names. ...
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Is MySQL HA via Kubernetes a tried and proven solution?

I'm working on a project which is about to migrate to a new production environment. One of the key components in this project is a MySQL database. The MySQL database must be highly available. We're ...
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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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Way to go for “dynamic” HA load balancing reverse proxy?

So what I want to do is, reverse proxy to a specific port based on the domain. e.g.: example.net => 10.0.0.1:10001 example.com => 10.0.0.1:10002 example.de => 10.0.0.1:10003 and so on The ...
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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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setting keepalived for HA

I followed this blog to setup keepalived service. This question is in continuation with this one. But whenever i'm trying to ping the Virtual IP directly from host it always says host unreachable. ...
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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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Upto what number of nodes can keepalived / CTDB HA softwares scale for IP failovers?

We are trying to build a high availability cluster with a support to highly scalable architecture. In an effort we plan to use - DNS server to distribute client requests across N nodes. All active ...
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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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Route all outgoing traffic (Example: HTTP request) through failover IP?

My server is currently making requests on an API, but the address is rate limited due to an internal mistake that over-queried resulting in a week rate limit. In the meantime, I would like to contact ...
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How can I Configure Keepalived for MultiNetwork Servers?

I am going to configure two servers for IPFailover with Keepalived, but each server has two network cables, so they are double networked. Should I configure Keepalived as it is configured on single ...
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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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829 views

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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107 views

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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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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58 views

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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633 views

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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494 views

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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319 views

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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428 views

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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79 views

Failover Cluster waits till the Site to Site DNS Replication done

I created a failover cluster with 2 subnets in AWS VPC. In one subnet I have DC1 (10.30.10.101) and Node 01 (10.30.10.102). In other subnet, I have DC2 (10.30.12.101)and Node 02 (10.30.12.102)....
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SmartOS can't ping any ip that resolves to failover ip

Our server is running SmartOS, we have 2 network cards one for internal use (10.x.x.x) and one external, i am able to ping any website / service except domains that resolve to our Failover IP (The IP ...
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113 views

DHCP Server shutting down?

I have a Server 2012 R2 Essentials server, which is the PDC in the domain. I also have another 2012 R2 server acting as a domain controller for times when the primary is down. I have setup DHCP on ...
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470 views

syslog udp load balancing and failover with keepalived

I have a simple two host graylog cluster for which i need to load balance udp syslog traffic, I'm using keepalived, floating ip and load balancing work perfectly, but it still directs traffic to all ...
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712 views

Not able to add node in cluster and getting exception while adding the node in Windows failover clustering

Recently one of the cluster node got rebooted(due to some disk corruption) for which we first removed from cluster and after that when we are trying to add it back into cluster we are facing exception....
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67 views

Error While Creating Azure SQL Server Failover Group

I am trying to implement a failover group in Azure for my SQL servers but I am getting this error while doing so. Further, I have question too. I got to know that Secondary Server should not be in ...
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WAN failover for local mail server

I have a question about possible failover solution for internet connection to local mail server in one small office where are problems with ISP. There is Kerio Control server with public static IP 1.1....
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failover two redhat node

I want to know is it possible to failover 2 Redhat physical nodes. both nodes are identical and they dont have any shared storage. I want to failover two separates redhat physical nodes when NodeA ...
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154 views

Get high availability with BGP

I want get high availability with BGP (mostly for DDoS Attack) I have.. Ubuntu servers(not Vultr's) and Vultr's ubuntu servers and I'll rent /24 IP block and AS Number soon..(and link it to vultr) (...
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Browser IP failover?

I hve read a bunch of the answers here and most of them are dealing with round-robin DNS (RR DNS), but I have a different question. If at the DNS level I am resolving to say 3 IPs in a specific order, ...

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