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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14 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
18 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 ...
-2
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1answer
23 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
160 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; ...
2
votes
3answers
245 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 ...
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1answer
85 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 ...
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0answers
18 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
17 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 ...
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1answer
32 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 ...
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2answers
27 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
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0answers
107 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
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2answers
32 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 ...
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0answers
37 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 ...
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2answers
80 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
41 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
15 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
49 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
40 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
52 views

2 Node Failover Cluster

Hi fellow tech geniuses! I got a task from my boss 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 ...
3
votes
2answers
119 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
35 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
94 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
votes
2answers
53 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 ...
0
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1answer
48 views

Debian Heartbeat IP Configuration

I need to setup a heartbeat with pacemaker based on debian OS where the active server virtual IP is 192.168.1.10 and the passive server virtual IP is 192.168.1.11. Both of the server is connected to a ...
2
votes
2answers
477 views

How to create a high-availability application server?

I am working with some hardware units which uses mobile Internet to communicate to my application server. Initially, the hardware had a hard-coded IP address (load balancer) in the hardware for ...
0
votes
1answer
26 views

SNAT& iptables in Centos

i have a remote server where I have added a new FAILOVER IP in a new interface, ETH0:0. Everything works perfectly; IP is setup. I want the traffic that is coming from ETH0:0 to use the ETH0:0 as the ...
0
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1answer
43 views

What happens to read/write operations during automatic client failover in MongoDB Replication

We have setup a 3 node replication set configuration for MongoDB. I want to know what happens to read/write operations during primary switchover. To be more explicit, few read/write operations were ...
0
votes
1answer
15 views

Bridge Mode with fail open

I have a GNU/Linux server running an HTTP reverse proxy (Nginx). The upstream server is well-know (IP address on a subnet). What I would like to "guarantee" is that in case reverse proxy goes down, ...
3
votes
1answer
47 views

Error configuring witness server for failover in SQL Server

I'm lost here, I am configuring a SQL Server for failover and have three servers. Principal server > SQL 2008 R2 Witness server > SQL 2014 Mirror server > SQL 2008 R2 All three servers can ping the ...
0
votes
1answer
41 views

Looking for Failover Cluster for Scientific Linux and nginx [closed]

here is what I'm trying: two instances of SL7.1 with nginx as reverseproxy no shared filesystem shared resources: virtual IP running nginx service I already tried keepalived and corosync + ...
1
vote
0answers
27 views

Hyper-V - Upgrading a 3 node 2008R2 cluster to 2012R2

I'm just after a some advice/tips on upgrading our 3 node Hyper-V cluster from 2008R2 to 2012R2. I have 3 x Dell r710s running Server 2008R2DC. These are clustered and running about 15 VMs (5 on each ...
1
vote
2answers
62 views

MongoDB automatic failover between 2 data centers

If I deploy a MongoDb replica set across only 2 data centers, if one entire data center fails, can there be automatic failover to the other data center? Consider the situation where 1 data center has ...
0
votes
0answers
21 views

Configuring witness server SQL failover

Looking to set up failover for two SQL servers. Question I have is about the witness server. Does the witness server have to be an instance of SQL whose only function is to be the witness server? ...
0
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1answer
23 views

Negotitate VRRP on a private link between routers (Possible?)

I have a topology similar to this one: R1 and R2 are two physical machines acting as routers. (Running some linux distro with Keepalived) R1 and R2 are connected to one another with a private link. ...
0
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1answer
45 views

Hyper-V failover cluster auto load balancing

We have a 2 unit Hyper-V cluster and I was wondering if there is a way to auto load balance the two? If one unit is restarted then I need to manually reassign some of the VMs to the unused hypervisor, ...
0
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0answers
29 views

Cluster pacemaker active/active low performance

I have a problem in my cluster active active configuration: pacemaker 1.1.12 corosync 1.4.7 cman 3.0.12 resource-agent 3.9.5 Varnish 4.0 Config: Cluster name: Clu1 Last updated: Tue Sep 8 ...
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vote
1answer
56 views

Achieving File Server Redundancy

We are in the process of moving all servers (or virtualising physicals) into a central datacenter connected via MPLS. Currently we are fully redundant on most aspects - RDS Farms, SQL Clusters, ...
0
votes
0answers
61 views

Failover Forward IP Packets with port from one server to another

Basically none of the solutions online have worked so far. Here's my setup: To simplify things, we're gonna assume it's a VNC server, My setup is a fully integrated OwnCloud and Ulteo. I've ...
0
votes
1answer
60 views

What is the best way to divert an IP address between two remote locations?

I would like to ask the community thoughts on the following. I have two data centers, one up 'Norf, and one down South Both are isolated in terms of network, but both have public IPs on a dedicated ...
0
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0answers
12 views

Sonicwall failover - “load shed”

I have a Sonicwall NSA 3600 with two WAN interfaces setup with standard active/passive Load Balancing / Failover. I am looking to add a cellular based WAN connection as a third failover option but I ...
0
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0answers
196 views

How to configure Failover IPs for High Availability with Hetzner Online

I have a cluster of 3 Ubuntu nodes running in VMs in the lab and want to take it now to production. Hetzner Online hetzner.de offers some good value dedicated servers, so I rented 3 machines, ...
0
votes
2answers
156 views

What is the best way to sync 2 identical centos servers in real time

I am operating a centos linux server(A) and I want to create a realtime backup server(B) so whenever server A goes down server B(after the failover kicks in) will take over. I already solved the ...
1
vote
1answer
34 views

Fault-tolerance/Failover in school project [closed]

I'm taking a course on distributed architecture. The course participants are divided into groups. Each group must develop an MMORPG-type console game and set up the infrastructure. The lecturer has a ...
0
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0answers
160 views

Seriously confused by SMB and iSCSI clustering

I am trying to configure my storage server(only 1 node for now, more to come)for SMB shares so that my separate Hyper-V nodes can use the storage server disks for shared storage. I decided to go the ...
0
votes
1answer
56 views

Nginx load balancer shows wrong site on failover server

I have five websites and I have three servers, all running nginx. Primary server Load balancer Failover server Each website has it's own primary server but they all share the same failover ...
0
votes
1answer
392 views

repmgr - after a failover switch, both nodes act as a master

I have a two node PostgreSQL cluster configured through repmgr. The database topology looks like this: db1 - 10.10.10.50 ( master ) db2 - 10.10.10.60 ( standby ) wit - 10.10.10.70 ( witness ) The ...
0
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0answers
600 views

UPSTREAM backup is pausing if WEB1 interface is down

upstream cloudpbxtest.synox.jp { server 10.0.7.2:443; server 10.0.7.7:443 backup;} server { listen 443; server_name cloudpbxtest.synox.jp; ssl on; ssl_certificate /etc/nginx/ssl/cloudpbxtest.crt; ...
0
votes
1answer
151 views

Keepalived failover not working - how to configure master / failover

I have following two server setup running: node1: keepadlived master -> HAProxy -> Apache node2: keepadlived failover -> HAProxy -> Apache The system works perfectly until I shut down keepalived ...
0
votes
1answer
71 views

Failover dedicated servers using DFS or use Cloud hosting

Currently I'm running a number of ASP.NET applications on a single dedicated Windows 2012 Standard R2 server with a hardware firewall in front. If this server goes down, my applications cannot be ...
0
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1answer
53 views

pacemaker failover nginx only once

I setup a cluster with two nodes with pacemaker 1.1.10 on CentOS 7. Then I downloaded a resource agent for nginx from github I tested my setup like this: Node 1 is started with the nginx and vip, ...