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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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Setting the same secondary public IP on multiple servers

The question concerns floating public IP's. I'm trying to set up a failover mechanism in the simplest way possible. Are there any hidden downsides to configuring the same secondary static public IP on ...
Blackness's user avatar
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3 votes
2 answers
658 views

ZFS: Handling massive no. of concurrent RW operations and failover

I have a single ZFS/Linux instance with a file that can grow to those crazy sizes supported by ZFS. A large number of concurrent users need to read/write from/to this file over the public inter net. ...
Harry's user avatar
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3 votes
0 answers
386 views

Safest way to configure `max_fails` in Nginx reverse proxy

We have nginx as a reverse proxy, load balancing across 2 application servers. These application servers were defined in upstream blocks like so: upstream app_backends { server 1.1.1.1:...
Robin Winslow's user avatar
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0 answers
57 views

Microk8s baremetal redundancy failover

I have a bare metal kubernetes cluster spanning over a cluster of raspberry pis where I am hosting some applications. And I want to test and setup an environment where if I "kill" any of the ...
Hickori's user avatar
0 votes
1 answer
351 views

How target group dns failover works with AWS

I currently have an AWS load balancer and it has a target group, containing an instance per AZ: 2 of these are unhealthy and I have configured the attributes of the target group so DNS failover ...
Thomas Stokes's user avatar
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95 views

How to change routes dynamically based on route availability on Linux?

I have an odd and somewhat specific routing question. I want to change routes/next-hop based on next-hop availability. My setup is quite odd, and probably a far cry from any best practice. It looks ...
espenfjo's user avatar
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0 answers
61 views

EUI Edge Router Load Balancing and Failover error

I unfortunately still have the problem that the Edge Router for some reason all the time uses VDSL and cellular at the same time without reason, although everything is configured as a failover so that ...
Fabian Schubert's user avatar
0 votes
1 answer
136 views

How does NGINX Plus handle server failure when doing session persistence for TCP/UDP communication?

My understanding from the NGINX Plus documentation is that their Load Balancing will route around servers that are down or swamped and that Session Persistence attempts to maintain the same server for ...
Sean Duggan's user avatar
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68 views

Failover and offline reads in GlusterFS?

I have a cluster, where all machines have the daemon running and the clients mounted. As far as I understand, only the machine where I run peer probe becomes the host. If a client goes down: the ...
Centaro's user avatar
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0 answers
17 views

Azure resources with dual region network configuration

I'll ask this question as Azure specific, but could provide to any cloud provider ( AWS , Google Cloud , etc. ) Is it possible to design Azure networks in such a manner that a single resource is ...
BaltoStar's user avatar
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463 views

Windows doesn't failover between internal DNS

We have an Active directory environment with 2 servers - WS2019 being the "main" one holding all FSMO and WS2022 being "reserve", almost all clients are Windows 10. Both are in the ...
SelfishCrawler's user avatar
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1 answer
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How to set up an IPSec VPN with failover on linux without virtual IP?

I need to set up a VPN connection using IPsec between a client system and our Linux server. There shall be a fallback in case of failure of the VPN endpoint, i.e. some sort of automatic failover. From ...
Tobias B.'s user avatar
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1 answer
423 views

Istio: How do I exclude unhealthy destination from a VirtualService?

I'm trying to configure load balancing and failover for external services. Each HTTP endpoint for the service needs its own specific headers. I created a virtual service with two destinations: ...
hylowaker's user avatar
  • 101
1 vote
1 answer
388 views

Failover load balancing by iptables is possible?

I'm playing around with iptables in my home lab. My first goal is to take my active directory communication into one load balancing virtual IP. I used prerouting chain to do that. For testing purposes,...
Peet's user avatar
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1 vote
1 answer
149 views

Build a failover strategy inside GCP to redirect if compute engine stop responding or is on an error state

Currently I have a architecture inside GCP (Google Cloud Plataform) of a Wordpress application that works this way Cloud DNS -> Load Balancer (with Cloud CDN enabled) -> Compute Engine (with ...
Alan Nicolas de Oliveira's user avatar
-1 votes
1 answer
48 views

Firewall failover internal ip

I have multiple servers at my data center and i want to switch to pfsense, but i don't know if it can automatically fall over to the second server that is a mirror from the first server. So if the ...
Lennard K's user avatar
2 votes
1 answer
330 views

How do I (automatically) re-attempt to deliver mail from a different Postfix server?

My network consists of two different locations and in both I have a Postfix server running for outgoing mail on each of them. Mail gets submitted to any of the two round-robin, based on having them ...
gertvdijk's user avatar
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-1 votes
1 answer
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Virtual IP in Single Server [closed]

I want to setup as below I have two ISP with different static IP, terminated in single server with two NIC, make virtual IP for this NIC, want to bind my local web serve to this Virtual IP, so that if ...
SDhimar's user avatar
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0 answers
555 views

zabbix connection to external database

0 I am trying to setup zabbix with two database , one on localhost and another on diffrent machine. zabbix server: 192.168.0.100 external database :192.168.0.154 I setup zabbix with localhostdatabaase ...
biplab 's user avatar
2 votes
1 answer
2k views

Kill tcp connections to all backends when any of the haproxy backend gets healthy

I have postgres cluster of 2 nodes behind HAProxy, any of those two can be primary and replica (role is managed by separate system - stolon). I want to force HAProxy to reset tcp connection when ...
pradeepchhetri's user avatar
2 votes
1 answer
1k views

How to initiate manual AWS Route 53 Failover when using Health Checks?

I am using Route 53 with DNS Failover configured based on Health Checks. This is great, but sometimes I want to manually initiate a failover. How can I manually cause a failover, for example in the ...
A X's user avatar
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1 vote
1 answer
3k views

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 ...
Himanshuman's user avatar
0 votes
2 answers
423 views

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 ...
Himanshuman's user avatar
0 votes
1 answer
624 views

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) ...
Aleks Vujic's user avatar
0 votes
2 answers
216 views

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 ...
theonefromcv's user avatar
1 vote
1 answer
947 views

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 ...
Yakup's user avatar
  • 13
2 votes
1 answer
3k views

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 ...
Torlarp Leenabanchong's user avatar
2 votes
1 answer
122 views

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. ...
Rob's user avatar
  • 224
0 votes
0 answers
70 views

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 ...
itsavvy2015's user avatar
0 votes
2 answers
2k views

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. ...
Kahn's user avatar
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1 vote
0 answers
563 views

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 ...
Gábor Major's user avatar
1 vote
0 answers
234 views

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 ...
user3098629's user avatar
2 votes
1 answer
857 views

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 ...
A X's user avatar
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1 vote
1 answer
150 views

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 ...
Paul's user avatar
  • 452
3 votes
2 answers
214 views

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 ...
G. Bennett's user avatar
0 votes
1 answer
71 views

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 ...
LeniVietz's user avatar
1 vote
0 answers
370 views

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 ...
nmajoros's user avatar
  • 111
0 votes
2 answers
480 views

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 ...
y_159's user avatar
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0 votes
0 answers
114 views

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 ...
libbynotzoey's user avatar
0 votes
1 answer
137 views

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 (...
Gerson Raul Acevedo Mendez's user avatar
0 votes
1 answer
5k views

How to configure failover cluster to register its records automatically after it deleted from DNS server?

Windows Server 2016 failover cluster with two nodes. How to configure the cluster to register its DNS records automatically after the records have been deleted? I tried to grant permission on DNS, but ...
Mostafa Elgaml's user avatar
0 votes
0 answers
52 views

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?
asdlll's user avatar
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0 votes
0 answers
583 views

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 ...
Marc's user avatar
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0 votes
0 answers
120 views

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 ...
Bhargav's user avatar
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0 votes
0 answers
217 views

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, ...
Vesper's user avatar
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0 votes
2 answers
174 views

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 ...
iamsumesh's user avatar
  • 155
1 vote
0 answers
175 views

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.
infantry's user avatar
  • 111
3 votes
1 answer
387 views

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 ...
febry's user avatar
  • 73
2 votes
0 answers
2k views

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
febry's user avatar
  • 73
0 votes
1 answer
115 views

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 ...
jrnetsec's user avatar

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