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 ...
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2
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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. ...
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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:...
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41
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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 ...
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215
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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 ...
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67
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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 ...
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42
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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288
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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:
...
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254
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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,...
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107
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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 ...
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392
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effect of fail_timeout and max_fails in upstream in nginx
I have a public facing nginx server acting as reverse proxy for an on-premises upstream server. I have two ISP providers so I want nginx to failover to the backup ISP whenever primary ISP fails.
...
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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 ...
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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 ...
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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 ...
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456
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zabbix connection to external database
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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 ...
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1
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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 ...
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863
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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 ...
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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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2
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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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588
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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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2
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179
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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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1
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841
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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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1
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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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1
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118
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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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62
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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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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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519
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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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210
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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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1
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725
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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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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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336
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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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2
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436
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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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107
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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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163
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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