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.
772
questions
0
votes
0
answers
13
views
Failover configuration using two machines for Angular/Django/MySQL
Using only two physical machines, how can one establish a failover configuration using nginx for a web app that is built on angular, django and mysql.
If any of the software components such front-end, ...
- 1
-1
votes
0
answers
17
views
Setting up Internet connection failover on Synolgy NAS
I currently have the following situation:
I have a Home LAN I use also as Small Office, just for myself
I have two WAN connections (both xDSL)
I have a Synology NAS (DS422+, if it matters) that is ...
- 274
-1
votes
0
answers
35
views
Cluster failover events caused by computer account password change
I'm seeing several of our MS Failover clusters running 2019 that use the same witness (quorum) server and periodic failover events within each cluster. The sequence of events that I find are;
The ...
- 1
2
votes
1
answer
91
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 ...
- 3,484
0
votes
0
answers
33
views
Linux Router Fu for failover?
I have some OpenWRT boxes and some other Linux boards... including a Software Defined Networking board (that I haven't used yet).
I have AT&T fiber with its own DHCP & WiFi (& cat5)
and I ...
- 5
-1
votes
1
answer
50
views
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 ...
- 1
0
votes
0
answers
161
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 ...
- 5
0
votes
0
answers
20
views
Simulate Outage on primary SQL Server in Azure Failover Group
I have a SQL Server with SQL Database in Azure that is replicated to a secondary SQL Server with a Failover Group. We have some functionality in code to redirect failed read requests to the secondary ...
- 101
0
votes
0
answers
29
views
Simple redundant "clone" of a linux server?
My current setup involves a small Linux server that runs a few services (LoRaWAN server, some visualization dashboards, and VPN allowing external access to devices on that network). I want to make it ...
- 109
0
votes
0
answers
36
views
Moving from split-scope to failover mode in a dhcp cluster
I have 2 DHCP servers (one in each site) , current configuration is split-scope (ranged .10 to .125 on the first site , and ranged .126 to .249 on the second one)
I want to move to an active active (...
- 3
2
votes
1
answer
556
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 ...
- 2,628
0
votes
0
answers
84
views
VRRP sync group not working?
I have two identical routers. Both are running VyOS.
They are both configured like this:
router1:
high-availability {
vrrp {
group wan {
address 94.<redacted>.1/29 {
...
- 11
1
vote
1
answer
365
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 ...
- 459
1
vote
1
answer
2k
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 ...
- 111
0
votes
2
answers
222
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 ...
- 111
0
votes
1
answer
345
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) ...
google-cloud-platform
0
votes
2
answers
109
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 ...
0
votes
1
answer
601
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 ...
- 3
2
votes
1
answer
1k
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 ...
0
votes
1
answer
98
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.
...
- 194
0
votes
0
answers
51
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 ...
0
votes
1
answer
803
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.
...
- 115
1
vote
0
answers
422
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 ...
- 113
1
vote
0
answers
171
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 ...
- 13
1
vote
1
answer
471
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 ...
- 459
1
vote
1
answer
109
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 ...
- 444
3
votes
2
answers
168
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 ...
- 31
0
votes
1
answer
61
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 ...
1
vote
0
answers
246
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 ...
- 111
0
votes
2
answers
305
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 ...
- 121
0
votes
0
answers
86
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 ...
- 111
0
votes
1
answer
70
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 (...
1
vote
1
answer
3k
views
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 ...
0
votes
0
answers
43
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?
- 1
0
votes
0
answers
280
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 ...
- 1
0
votes
0
answers
94
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 ...
- 87
0
votes
0
answers
142
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, ...
- 774
0
votes
2
answers
126
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 ...
- 145
1
vote
0
answers
59
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.
- 111
3
votes
1
answer
260
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 ...
- 73
2
votes
0
answers
1k
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
- 73
0
votes
1
answer
94
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 ...
- 5
0
votes
1
answer
2k
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 ...
- 1
0
votes
0
answers
199
views
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 ...
- 1
0
votes
0
answers
201
views
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 ...
0
votes
1
answer
448
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 ...
1
vote
1
answer
45
views
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 ...
- 11
1
vote
0
answers
129
views
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 ...
- 275
4
votes
1
answer
998
views
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 ...
- 65
0
votes
1
answer
121
views
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 ...
- 19