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 ...

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failover IP always resolves to self from within self

Assume this setup with 2 servers: server A ip: 1.1.1.1 failover ip: 5.5.5.5 server B ip: 2.2.2.2 failover ip: 5.5.5.5 Each of the server has its own IP but also a common failover IP which ...
-1
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0answers
12 views

SQL Witness size

I've been unable to find any reference from Microsoft's TechNet nor MSDN site outlining the size requirements for a SQL witness instance. I recall from a Windows Server witness setup, it's barely a ...
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1answer
10 views

Bridging host-only subnet on multiple Dom0s

I currently have two XEN-Hosts running a set of virtual machines. These machines can communicate with each other via a host-only network. I want to be able to move virtual machines between both ...
0
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1answer
23 views

System outage when only one of two HAProxy servers is down. Failover doesn't seem to be working

First of all my experience with HAProxy stack is just one day old so I hope my question makes sense. I have 2 HAProxy VMs and 2 Apache VMs (vagrant machines) as follows. 192.168.50.11 HAPROXY VM1 ...
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1answer
16 views

Use Ceph as redundant storage for failover FTP service?

I need to setup a redundant FTP storage service that can survive one server-crash. I have two servers SrvA and SrvB that shares a virtual IP IpVirt (an IP that will usually point to SrvA but that ...
0
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1answer
17 views

SSHFS mount remote directory which subfolder are mounted locally

I have two servers FTPa and FTPb Each server is running PHP web file transfer app that sits in /var/www/html/files/ On both servers some of the app subfolders are mounted with folders inside /sftp/ ...
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1answer
39 views

Load balancing 2x IIS Webservers, across subnets

Morning chaps, Currently we've got one virtual webserver, and if it goes down, nobody can login or access our Intranet. To resolve this I've installed two test servers (2012 R2), one on our first ...
0
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2answers
106 views

How to setup failover with rabbitmq cluster with a loadbalancer like f5

I have been trying to find information on f5 developer central and internet regarding the following setup with no luck. We want to have a rabbitmq cluster with 3 nodes. 1 node will always be primary/...
0
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1answer
63 views

Failover server for EC2

I have one Amazon EC2 instance of Windows Server which is running application with SQL server. Our users from On-premise use RDP to login into this server using Elastic IP and do their work. I want to ...
3
votes
1answer
139 views

DNS issue with Failover IP from Hetzner

Assume we have two servers A and B with 'real' and external IPs and we can switch the so called 'failover ip' (W.X.Y.Z) to point to a specific external IP of A or B. This works from the 'outside' and ...
0
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0answers
13 views

In LVS with keepalived, should different virtual servers have different virtual routers?

I have LVS with Keepalived in a master/backup configuration, used as a load balancer for several virtual IPs. Currently the Keepalived configuration has a separate vrrp_instance for each VIP. Each ...
0
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0answers
25 views

Multiple IP failover on VPN PPTP

I have a server at SoYouStart, I ordered an IP failover. I want to setup a PPTP VPN so I could be able to have one connection to the "normal" IP and one to the failover IP I couldn't manage to do ...
-1
votes
1answer
57 views

Load balance two ADSL connections Centos 7

I have centos 7 server working as a gateway for my network with three LAN cards and two internet connections from different ISPs , i want to combine the two connections and balance the network load ...
0
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0answers
15 views

How do I redirect connections to a local mailserver in fail case to a online mailserver (with dns?)

Situation: I administrate a small business network (10 employees) with a bad internet connection (satellite, limited traffic volume, weather-dependent), so some services like mailserver are organized ...
0
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0answers
64 views

Redis & HAProxy - updated configuration settings?

Have gotten 2 Redis instances installed, with one being a master. That is working remarkably well and with no headaches. I'm now trying to get my HAProxy/keepalived nodes to handle some sort of ...
0
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0answers
55 views

TCP Balancer active/standby active/passive

I have two Servers, Server A,ServerB. running as TCP socket server. I want to a active/standby or /active/passive failover. that means: 1:Server A and Server B Running, route ALL connection to ...
1
vote
1answer
278 views

open-iscsi initiator on linux does not see the passive side of an active/passive open-e target

I have a Linux server running SLES11 SP4 which uses open-iscsi and multipathing to connect to a LUN that is presented from an Open-E DSS v7 storage cluster with active/passive failover. The Linux ...
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0answers
8 views

Add Multiple FileShares to Windows Failover Cluster

Is there a way to add multiple fileshares simultaneously or via powershell to Windows Failover Cluster on a Windows 2012 R2 server? With the user interface, this will take all day because there ...
0
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1answer
34 views

Azure SQL Database Failover But Use Same DNS Name

I am researching ways to make a highly available web application in Azure using the PaaS App Service and DBaaS SQL Database offerings. Standard databases include Standard Geo-Replication to ...
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0answers
29 views

Windows network teaming failover email notification

I'm wondering if it's possible to configure Windows Server network adapter teaming to send alert email to administrators in case of failover. Does this function exists builtin ? Or do we need any ...
0
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2answers
82 views

window server 2012 r2 clustering - shared storage required or not

I just came to know that we can setup a 2 node window failover cluster without using shared storage (SAN) In that case, how does services running on 1 node failover to another when their data is not ...
0
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0answers
26 views

MySQL Cluster: Too Many Connections

We have our java application directly connected to the MySQL cluster (NDB engine) with 1 SQL Node. We also have another SQL node. We had a requirement to load balance our 2 SQL Nodes with the physical ...
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0answers
23 views

Performance concern with hosting large clustered DBs on VPS cloud servers

I wonder if anybody else bumped into this issue? You get a couple of beefy 12-core VPS instances in some cloud like DigitalOcean and set up a database on them in "active-passive" cluster ...
0
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0answers
22 views

How to failover to another ovpn configuration?

The OpenVPN documentation gives information about failover/loadbalancing over several servers, within one configuration file. Is there a way to failover to another .ovpn configuration? I have the ...
1
vote
1answer
41 views

Enable HTTPS with CNAME Apache

I have two apache servers, both of which hostnames are primary.domain.com and secondary.domain.com The Primary server will rsync and mirror all files to Secondary server as a backup. I am trying to ...
2
votes
2answers
236 views

How does High Availability work? [closed]

I don't understand how to setup a failover for my quite simple scenario. I am building a service gateway for API. What I want to have is two servers hosted in different datacenters. And I simply want ...
0
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1answer
39 views

time based (scheduled) haproxy backend backup setting

I have 2 web servers: A and B with haproxy before them. I'd like to use A as a master and B as a backup/failover server. I'd like to know whether it is possible to have: no automatic switch to B in ...
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0answers
30 views

failover from Oracle VM to Azure

Can I do a failover from Oracle OVM to Azure and then fallback to Oracle VM i.e. to Oracle Hypervisor environment? Does Azure support this at this point of time?
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0answers
77 views

How does the Azure Web Apps architecture look like?

I've had a few outages of 10 to 15 minutes, because apparently Microsoft had a 'blip' on their storages. They told me that it is because of a shared file system between the instances (making it a ...
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votes
1answer
35 views

Need some clarification on a NIC functionality on a Dell Poweredge r610

Quick question. I'm trying to understand the NIC functionality of this server. NIC specs from manual: My question is, do the two broadcom controller chips provide fail-over redundancy? For example, ...
5
votes
2answers
423 views

nginx use proxy cache if backend is down

I need to nginx proxy use cache if backend server down: this is my configuration. but seems be nginx use cache without check backend server. http { # ... proxy_set_header Host $host; ...
3
votes
3answers
296 views

How to recover from switch failure? [closed]

Suppose there is only one switch within a system and it is connected to a bunch of machines to form a network. If this switch goes down, the entire network goes down. Chances of this happening are ...
0
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1answer
884 views

Could not get domain controller name from machine

While validating a Failover Cluster over two member servers I get the following two errors: Connectivity to a writable domain controller from node SQL2.domain.com could not be determined because of ...
0
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0answers
40 views

how to assign failover ip into windows vm (ubuntu, kvm)

I purchased a dedicate server (Ubuntu 14.04 LTS amd64) with a failover ip from online.net. And i want to setup a windows vm with failover ip using kvm. I tried myself several times, but all failed. ...
0
votes
1answer
22 views

SQL Server: One Production server be Failover for other

I'm surely using the wrong terminology, but I have the following: SQL Server A (SAN1) - DB1, DB2, DB3 SQL Server B (SAN2) - DB4, DB5, DB6 It's currently SQL 2008 and we're looking to move to SQL ...
1
vote
1answer
155 views

Install DHCP failover on domain controllers vs member servers?

What is the recommendation for installing DHCP failover; domain controllers or member servers? I can't seem to find any recommendations either way. I did find an old question here pertaining to ...
1
vote
2answers
31 views

Creating a failover cluster of 2 VMs

I'm trying to create a cluster of 2 VMs on hyper v. The 2 VMs and the host server all running on win 2008 r2. When attempting to test validation for the failover cluster I'm getting an error of "disk ...
3
votes
0answers
189 views

How to Reduce Failover Interval in HAProxy?

I have setup HAProxy and it is working fine. I observed that when one of the node goes down HAProxy detects that immediately, but switch-over / redirect existing traffic to the rest of working nodes ...
0
votes
2answers
45 views

Implement an IP on Debian to redirect & failover on 2 external IPs

Hello network & sys gurus, I would like to use one Debian server inside a cluster to host a IP 1 redirecting to IP 2, or if IP 2 is not reachable, redirecting to IP 3. IP 2 and IP 3 are hosted ...
0
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0answers
50 views

NGINX Reverse Proxy Cache

I'm trying to create a website failover solution utilizing NGINX as a caching reverse proxy. The reverse proxy is the main A record. I'd like it to constantly serve cache, and display stale cache in ...
-1
votes
2answers
194 views

VM migration and IP address

When a VM offering a service is migrated to a different server is it an important requirement from the client applications point of view to retain the same IP the VM had before ? For long lived TCP ...
0
votes
2answers
66 views

Confused about windows failover cluster, DC and SQL AlwaysOn

I'm setting up a AlwaysOn group for a SQL Server 2014 database. However, as this is my first time I have a lot of questions and as I proceed to solve one issue, another arises and this seems to go ...
0
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0answers
21 views

Cisco 1921 ISR K9 with Cisco 2620xm failover

I have a Cisco 1921 ISR and a Cisco 2600 Router (2620xm). The C1921 is the primary router on the corporate network. I would like the Cisco 2600 to connect to a module on the C1921 and provide 2 ...
0
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0answers
153 views

Windows Failover Cluster Generic Script

I have two windows server 2012 R2 machines set-up in a cluster. Everything seems fine with regular services but when I try to create a generic script resource I encounter the following vague error: ...
0
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0answers
193 views

DNS load balancing with multiple IPs on the same domain in GoDaddy

Looking for a cheaper solution than amazon CloudFront, I placed two "A" records with different IPs to different servers on the same subdomain in a NameSever managed by GoDaddy in order to achieve some ...
0
votes
1answer
71 views

2 Node Failover Cluster

I need to build a 2 node Hyper-V failover cluster, that's dead simple right? The problem is that the hardware is already bought. Both servers are identical and approved. Related spec: 250GB Drive ...
3
votes
2answers
126 views

Why should we purchase a dedicated load balancer when the firewall can do it?

I've got 2 servers, let's call them 'node1' and 'node2' installed at a data centre. They run our application software. They are interchangeable, and each have a full copy of all customers' databases. ...
1
vote
1answer
37 views

Failing over to mirror instance when not using a witness server

I have a set up where I have two SQL servers set up for failover mirroring to two other SQL servers. I am not using a witness server. I had previously used a witness server and that of course would ...
0
votes
3answers
205 views

Web Server failover solution [closed]

Sorry for a dumb question but I`m a green hand yet. I have two Linux server: one of it is running Apache with MySQL to serve my web-platform (master server) another one is supposed to be a sort of ...
0
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2answers
68 views

Secondary AD DC With Fail over

Situation: I have a AD DC authenticating all the users now and serve as the DNS as well. Problem: After reading through this, I am wondering how do I set up another AD DC and configure the site and ...