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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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19 views

Setting up multi redundancy server for primary server [on hold]

Currently now we have main server that provides registration process (application via sms/online) to our database and it has the database also. we looking into setting up more than fail safe server ...
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12 views

Failover Gateway, 2 Server

I have set up 2 DHCP servers that route trough the firewall to the WAN. Both of them act as Gateway. The DHCP has a failover configuration allowing to supply the same network. Now if one of them goes ...
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9 views

Azure Site Recovery Test Failover Fails for CentOS 7.1 - Failover failed because of an unsupported configuration

I am trying to perform a test failover to Azure of a brand-new CentOS 7.1 VM. Failover is On-Premises to Azure, but this VM is really an Azure VM running in a separate isolated Virtual Network (for ...
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23 views

Failover issues when running multiple firewalls with multiple switches

We have 2 cisco asa 5506-x configured in an active/standby configuration. We have 2 switches which have 2 vlans configured, vlan 1 for internal traffic, vlan 2 for external traffic. Each firewall ...
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1answer
25 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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53 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
42 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 ...
0
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1answer
21 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 "...
1
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21 views

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 ...
3
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1answer
144 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 ...
0
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0answers
41 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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0answers
24 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 ...
0
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1answer
37 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 ...
0
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1answer
16 views

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 ...
2
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1answer
77 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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0answers
44 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 ...
0
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1answer
41 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
135 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, ...
0
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1answer
167 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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0answers
18 views

Software router - failover static route

To understand my question here is a brief explanation of the network setup: Two buildings 5.6KM appart. MS Server 2008 R2 at site 1. Other site has several PCs that need to RDP to the server. ...
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0answers
222 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 ...
0
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1answer
233 views

haproxy backup / failover for servers one by one

i run haproxy 1.6 in our environment for different applications. Former we used a Cisco product. Haproxy has a lot of advantages but there is one thing i could not configure with haproxy or i do not ...
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1answer
28 views

BIND give DNS record only from alive web server

I want to configure failover dns records for my web service. I want configure something like geo dns, I want check alive web server and BIND must give only alive DNS record For example if host A with ...
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147 views

IP failover with Ubuntu Server

I have some questions about how to proceed with an issue that was suggested to me, and about the tools I can use to do this operation. Well, I have two hosts, these two hosts have two Network ...
0
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1answer
194 views

Keepalived loadbalancing with Nginx not working with only backup Nginx alive after Master Nginx dies

I am using 2 Nginx servers on 2 different machines with Keepalived installed respectively on both machines. Below is the configuration for both Keepalived. MASTER KEEPALIVED vrrp_instance VI_1 { ...
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0answers
42 views

(Windows Server 2012 R2) Is it possible to split a failover cluster into 2 new clusters by expanding and splitting the existing cluster?

Say you have an existing application cluster using Windows Failover Clustering - something perhaps like this: Roles: File Share Services RavenDB ClusterDisk Service ServerName (ravendb.mydomain) ...
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236 views

How to have multiple routes to the same remote VPN in pfSense?

We have a pfSense server in two offices. Our main office has a VPN server configured, and our satellite office has a VPN client configured, using the IP 123.156.88.253 (just an example). We have just ...
0
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1answer
28 views

VM VPN failover

I have a VPN connection from Network1, Host A (VM) to Network2, Host B and Host C. An application in the VM(Host A) is statically configured to communicate with Host B on Network2, i want Host A(...
2
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2answers
129 views

Failover SQL cluster to DR site using replication

I am attempting to fail over a SQL cluster with 2 nodes using Zerto replication. I am running Server 2016 Standard and SQL 2017 standard. My network is not stretched, so I need to failover using a ...
0
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0answers
36 views

Keepalived Gratuitos ARP

Is there any way in keepalived v1.4.4 to stop sending Gratuitous ARP for specific instance? I need that because upstream L2 ISP is forbidding us to send such frames. I tried with this config: ...
1
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1answer
46 views

How to sync azure SDD disk across datacenters?

I'm working on a failover plan for my (at the moment, single Azure region) webservers. My azure resources are due to legacy applications quite oldschool, Windows server 2016 VM's with SSD disks ...
1
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1answer
463 views

Can I use failover partner in the connection string for non-mirroring SQL server set up?

I have set up two SQL server instance with IPs say x.x.x.x and y.y.y.y. On the application level when specifying connection to SQL server, can I specify the connection string as below <connection-...
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2answers
94 views

Best approach to achieve high availability and disaster recovery?

We are deploying SQL servers at two geographically distant sites. The bandwidth between two sites is 10Mbps. The requirement is to have both sites writable/readable. Both sites have redundancy ...
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0answers
26 views

how to prevent data loss when intra-site fail over takes place

Our program requires two sites, each has two MS SQL Servers. Both sites need to write data to local SQL Server and all four SQL Servers need to stay in sync for intra-site and inter-site redundancy ...
1
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1answer
764 views

Full Mail Server Failover

I'm trying to find the best solution to allowing a mail server to still be fully operational even if it were to crash by switching to a fallback server. We run our mail server on Debian using Postfix ...
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0answers
50 views

How can I programmatically force a NetScaler cluster to failover?

Working on a script that needs to fail over the netscaler to it's secondary and back. I'm attempting to use the Nitro REST API, but so far it's defeating me. The API docs say there's an action to ...
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0answers
36 views

Setting up a failover enabled infrastructure with both VPN & direct ISP traffic (proxied) to a LAN & direct ISP to another subnet / LAN, need input

I'm looking to solve the following problem in the cleanest most succinct way. I would prefer to use a single device / server to accomplish this, but realize that I might need to pull together some ...
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2answers
334 views

Create failover for DNS MX record and smtp

Have a question, I have mail server behind two separate public IP addressees, ISP1 and ISP2 - with auto failover. On my domain provider I have A record mail.domain.com pointing to ISP1 and then MX ...
0
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1answer
456 views

Zimbra (open source) how can I perform a backup?

Good day everyone So I am trying to perform a backup on out zimbra server and I found documentation (Zimbra Backup Proceedures ) and realised that the scripts aren't working correctly. Scripts from ...
0
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1answer
89 views

Scheduled tasks when replicating servers

Currently we have a single server that is serving customers and we've planned to add a new server and setup load balancing and database active cluster, so in this case both servers would act the same. ...
3
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1answer
447 views

CTDB Samba failover not highly available

TL;DR Failing a node in a ctdb + samba cluster while interacting with a share interrupts share connection. here and here state there is work in progress to make this possible here states it is ...
0
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1answer
395 views

Using OVH/SYS failover IP as server's main IP

Good morning my server is a dedicated from SoYouStart. I purchased 8 failover IP. OS is Centos 7.4 + CloudLinux. The machine will run a cPanel box. What I need is associate the cPanel and ...
7
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1answer
122 views

Azure Site Recovery unplanned failover

I have managed to create a DR of a couple virtual machines to Azure. I am using Azure site recovery and Azure resource manager, and I followed this manual about how to do this https://www....
6
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1answer
167 views

Internal storage as HA failover cluster storage pool ?

I have 2 HyperV server (2012 R2) nodes with shared ISCSI storage (ubuntu 16.04) in a Failover Cluster. I want to make that 3 servers (windows server 2016 and/or 2012r2) each with 2 partitions, one ...
0
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1answer
620 views

pfSense / Load Balancer: Access Virtual Server from LAN

I have a network as diagram below: On SITE A, pfSense firewall server public port for a virtual server (example: port X), virtual server have 2 pool: Pool 1: point to A_Srv_01 Pool 2 (Fall-back Pool)...
0
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1answer
67 views

Network structure for multiple ISP failover

I want to create a corporate data center that will use 3 ISPs. I want to use load balancing and/or fail over with 2 of the 3 ISP because they will be used for MS Exchange servers and web servers. The ...
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0answers
583 views

NGINX: Failover to backup in ip_hashed upstream

I'm using NGINX as a load balancer to run multiple instances of my site. I'm working on conditional routing to send users to specific servers based on an incoming HTTP header. The end goal is to have ...
0
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1answer
1k views

Debian 9 - additional IP

I have a server with Debian 9.2. (Soyoustart) I want to add 2 additional IP addresses. Is it correct to add them in that way ? In the file "/etc/systemd/network/50-default.network", to these lines :...
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0answers
99 views

Solaris Clusters - cluster: (C383355) No response from daemon on node

I followed the instructions here to setup 2 node solaris cluster At the end of everything I noticed that one of the node's status is "offline" I also see the following message from "# cluster status"...
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2answers
50 views

What software/hardware to use to implement STONITH so that machine A can cut the power of machine B?

I'm trying to enforce split-brain protection when machine B takes over on a failover scenario. Basically I want to enforce that machine A is really out before machine B is activated, avoiding the ...