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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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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automatic Active directory failover

I have 2 servers that run DHCP, DNS, and a Domain Controller. they both run Windows Server 2019 Standard. dhcp is in a fail over relationship for scopes. when one server loses power, clients use the ...
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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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HA Cluster with PCS

I am using Ubuntu 18.04LTS. I can't seem to figure out why this cluster will not work. I believe the Corosync service is not starting. I started out with sudo pcs cluster setup --name cluster_test ...
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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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Windows 2016 Failover Cluster Client Access Point 'Binding'

I'm having a network issue with a couple of HA roles when failing over to one of the two nodes in my cluster. Here's my setup, this is not new, been running since 2016 but this problem is new, not ...
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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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Is it possible that the old primary follow the new secondary?

I need to change the roles between two nodes. Circumstance: 2servers: primary: psql01 and standby: psql02 After psql01 stops, psql02 becomes the new primary. After a while, start psql01 On ...
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How to identify the cause of reboot as the log was not captured in a SLES 12 SP3 (2 node cluster)?

Currently, a failover occured from node 1 to node 2 as there was a sudden reboot on node 1. Upon analyzing the log, it is found that the reboot log was not captured and also kdump was not configured ...
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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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Unable to create cluster with repmgr for postgrSQL

I follow this guide to setup. https://medium.com/@victor.boissiere/how-to-setup-postgresql-cluster-with-repmgr-febc2f10c243 Everythings going fine but when come to here sudo -i -u repmgr rm -rf /...
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Issue with RV340 Failover to 4G LTE with a Verizon/Novatel USB730L

( Background, CCNA, trained on CCNP but didn't take exam. I come from enterprise networking working on 2960X's, 4500X's, integrated service routers, etc and these small business appliances I never ...
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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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Azure - Windows Server Failover Cluster - Can't Connect to Cluster Name

In our environment we have a few Windows Server Failover Clusters hosted in Azure. I'm having an issue that I can't seem to find information on. As it stands, the clusters work fine except we can not ...
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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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Repmgr service crashes during automatic failover, slave's upstream node points to failed master - Postgresql

We are using Centos7 with PostgreSQL 11.5 and Repmgr 4.4 in our system. We have setup an automatic failover system using Repmgr with a 3 node cluster (1 master - Server A, 2 standbys - Server C and F) ...
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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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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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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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Automatic Failover Wifi / Proxy

I have got the following scenario: Mobile Device (Linux) that is connected to wifi and or mobile network. For the mobile network, the whole system must use a proxy and a special DNS server since ...
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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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Monit flag stopped service as normal

I am attempting to use Monit to do simple service up/down tracking on our servers. We have a number of java softwares that run and I want to keep those running. The trick lies in us using 2 servers ...
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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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Azure SQL failover groups grace time

I have a hard time understanding failover and grace periode. If I read https://docs.microsoft.com/en-us/azure/sql-database/sql-database-auto-failover-group I understand that the minimum grace periode ...
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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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112 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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121 views

No traffic arrives via openstack floating IP and pacemaker/corosync

I am following the steps from https://fuga.cloud/academy/tutorials/ha-vip-with-corosync-on-openstack/. I am missing a reason why traffic going into the external floating IP is not arriving correctly ...
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548 views

Failover Nginx reverse proxy

I am looking to setup my Nginx reverse proxy to handle a server failure or Nginx failing for some reason or another. I know how to configure nginx to work as a load balancer/ reverse proxy for other ...
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1answer
125 views

DNS IP failover for two WAN

I have two WAN from different providers, I would like to know how can I manage an IP failover to switch services in case of failur of the primary WAN. The only solution that I know is to use dns ...
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29 views

Windows 2012 AD user failover to AWS Windows AD

We're having a bit of an issue with our local Windows AD not failing over to our AWS hosted AD. We have web portals for our support staff to log into with AD credentials. When our on-premise AD "...
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Network Status Down after HyperV to Azure Failover

I was hoping someone could help. I've setup a recovery services vault protecting a HyperV site. Everything seems to be working as expecting in terms of replication, but when performing a failover ...
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2k views

Redis: read-only slave vs fail-over slave?

I'm reading a lot of documentation around Redis network configurations, and I'm confused about how it seems the requirements in the architecture mental model I had, don't seem to map with the current ...
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231 views

nginx upstream configuration to switch back and forth between two servers

I've got a legacy web application, it sometimes crashes. Also, it have an application cache residing in the virtual space of the app itself - it can not share the cache data with other instances of ...
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101 views

Conditional Takeover with Keepalived

Have a bit of an odd situation. I need to set up a singular VIP with keepalived that will bounce among machines as they fail/come down, etc. I have four total servers, each running a database ...
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78 views

Debian HA cluster with 3 servers, run script on outage for DNS failover

I am currently building a HA cluster, the database is already on Galera, the last thing would be, trigger an DNS update to redirect the traffic to another machine. Is there any software, which can ...
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How do https stacks handle failed links when there are multiple A records?

I have setup DNS entries so that a certain FQDN has four A records, with four IPv4 addresses of four networks boxes converging thru a router to a single https server. That does load balancing across ...
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1answer
166 views

Nginx : What is possible downtime for switchover for Active-Passive clustering

I understand OpenSource NginX does provide Active-Passive clustering of multiple Nginx web servers. For Active-Active, Nginx Plus required which is paid. How much is switchover time in case of Active-...
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77 views

Is it possible to rollback a migration from Hyper-V to Azure

I am migrating VMs from Hyper-V to Azure using the integration among SCVMM and the Azure Replication Service. For a given VM, I performed successfully the test failover, I validated the outcome, I ...
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47 views

Windows server fail over clustering between two seperated server [closed]

i have two windows server with speared location,hard and SQL server. how i configure failover between them (IIS and SQL Server)? is there any scenario for this ? is it better to use shared storage ? ...
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2answers
1k views

nginx reverse proxy for high availability setup?

The scenario is like this, I have a nginx reverse proxy server in front of two app servers which are backups of each other, I want nginx to forward all user requests to the first app server at first, ...
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1k views

Configuring Heartbeat to run shell script

I set up a high availability system with Heartbeat, I wish that when there was a drop in the main cluster and the secondary cluster was activated, Heartbeat start in it and execute a shell script. ...
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2k views

How to set up tcp check with keepalived?

Trying to set up HA bastion servers. Failover, load balancing is not needed. Two servers running debian. bastion01 and bastion02. 192.168.0.10 and 192.168.0.11. Floating IP is 192.168.0.12. I started ...

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