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 ...

learn more… | top users | synonyms

1
vote
2answers
123 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
22 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
votes
1answer
28 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
votes
1answer
81 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
votes
0answers
37 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 14:28:...
1
vote
1answer
96 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
113 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
62 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
votes
0answers
13 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 ...
1
vote
0answers
478 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
272 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
41 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
votes
0answers
338 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 ...
1
vote
1answer
67 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 server....
0
votes
1answer
946 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
votes
0answers
604 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
249 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
97 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 used,...
0
votes
1answer
62 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, ...
0
votes
1answer
54 views

Speed up EIP reassignment

I have a real-time application running on an Amazon EC2 instance. I'd like to implement master/slave redundancy with a VPC, a second instance and keepalived. So far it's working reliably, but in the ...
1
vote
0answers
97 views

Simultaneous server crash in fail over cluster

I have 2 servers in a failover cluster. The cluster defines a shared 'ClusterStorage' drive. The drive maps to a SAN device through iScsi. Recently, the 2 servers rebooted on their own at the same ...
0
votes
0answers
44 views

local port forwarding with failover

There is a number of similar though not identical processes (worker processes) running on the localhost and listening each on its own TCP port, let's say process1 is listening on port 10001 process2 ...
0
votes
0answers
212 views

AWS + KeepAliveD: Not able to Ping or Telnet Virtual IP from remote hosts

I am setting up KeepaliveD with 2 nodes on AWS by following this article. My Virtual IP gets moved from one node to another in case of fail-over. However, the VIP just cannot be accessed from a remote ...
1
vote
1answer
664 views

How to setup redundancy for AWS Elastic Load Balancers?

In the spirit of redundancy and fail-over, I would like to know some strategies on setting up AWS Elastic Load Balancers for DR, that is, if this is really an issue? (A single ELB would LB traffic to ...
0
votes
3answers
661 views

Can we build a Hyper V failover cluster without a SAN or other shared storage?

I have a question about Hyper-V Failover Cluster. I have 2 server Hyper-V and want to use a failover cluster. As far as I know, I need a SAN server for that, so do we need it in here?
0
votes
1answer
722 views

Bring back to restoring state an online database

I configured logshinging for a database. I did some tests and tried a controlled failover. During log shipping secondary db is in restoring state. To have a controlled failover i stopped the primary ...
0
votes
3answers
122 views

OpenVPN failover

In my company we have two offices in two totally different locations. A is the main office, and B is the secondary. There is a VPN server at A office, and every computer access the A network via this ...
1
vote
1answer
70 views

Hyper-V Failover-Cluster: How does the Cluster know the difference between the Management and the Cluster Network?

Reading the Network Recommendations for a Hyper-V Cluster in Windows Server 2012, I am left with some unanswered questions. It's recommended to have a management network and a cluster network. The ...
0
votes
0answers
86 views

options timeout doesn't work when Primary DNS server in resolv.conf fails

I currently have 2 load balanced AWS Linux box(s) which communicate to several windows web servers.These Linux servers act as a forwarder, re-direct rules etc onto these windows boxes and acts as a ...
-1
votes
3answers
138 views

How does HA / failover work?

Let's say we have ten servers, each one has a copy of stateless application. user enters address in a browser / client program. dns server returns a list of ip (however many people say that dns ...
1
vote
2answers
102 views

Transparent switch from Wifi to ethernet

I have the following network setup: Zyxel USG 200 Firewall which also acts as DHCP server 2 Switches 2 Wifi APs (Zyxel NWA3560-N and WAC6503D-S) with NAT and DHCP disabled The clients (mostly ...
0
votes
1answer
109 views

Proxmox Virtualized Client (Network Configuration)

first some information about me. I ordered a server from ovh and purchased one failover ip to test proxmox and do some training. The main Server is hosting proxmox(Example IP: 123.45.67.89 to figure ...
1
vote
1answer
263 views

Internal Failover Load Balancing in Azure

I have a MongoDB Cluster deployed in Azure. Normally a MongoDB cluster has at least a couple of mongo router instances (mongos) which is where an application should connect (the application is also ...
0
votes
1answer
239 views

Bind9: Master->Slave Notify IPv6 with fallback to IPv4

I've a small Master->Slave DNS scheme setup between two machines running Debian 8 + Bind9 in dual IP stack. The master and the slave both own an IPv4 and IPv6 used by bind, enfored by the ...
2
votes
1answer
401 views

How to set up ARR in active/passive (aka failover) mode?

The Problem I am trying to configure several web farms (for different sites) following the NLB+ARR architecture. Let's say I have 6 VMs: ARR+NLB cluster of 2 VMs. It receives traffic and forwards ...
2
votes
0answers
140 views

DHCP Failover works but no DNS available

I have a DHCP failover (load balance) configured. DHCP failover works but the clients are not getting any DNS entries. We have 2 DNS servers using AD-integrated zones, and the failover is between ...
2
votes
2answers
3k views

Redis high availability and load balancing

I'm using Redis for some time and now we want to move to a redundant cluster which would be fault tolerant, highly available and load balanced. I principally use Redis for some PHP web application ...
3
votes
1answer
338 views

using apache2 mod_proxy(_balancer) for 3+3 tomcat failover configuration

we have got 3 active Tomcat instances, the load should be distributed evenly amongst them (sticky sessions via jvmroute, ajp). We also have got 3 failover Tomcat instances running. If one of the 3 ...
0
votes
2answers
152 views

How to enable “persistent mode” in Windows failover cluster manager 2012?

In Windows Server 2008 R2 there was a checkbox named "Enable persistent mode" on a General tab in the Properties of a cluster resource. In Windows Server 2012 that seems to have disappeared. My ...
0
votes
2answers
3k views

How to configure NIC teaming on free VMWare ESXi 5.5?

There are articles online that describe this process for paid version of ESXi via VDS. My understanding is that VDS is not available on free ESXi version. We, however, do not need fully blown HA on ...
0
votes
0answers
108 views

vSphere Cluster no failover

I've inherited a 2-node vSphere Cluster (vCenter appliance in the cluster). We recently had one host crash during working hours. My understanding with a vSphere HA Cluster (and like any cluster) when ...
0
votes
1answer
128 views

Replacing 1GBe with 10GBe NIC Failover Cluster Host

We have a 3-node Failover Cluster - all currently running 4 Port 1GBe NIC Cards. We intend to upgrade these NICs to 2x 10GBe + 2x 1GBe NIC cards which have the following configuration: Ports 1 -- ...
1
vote
0answers
120 views

dhcp relay with failover to local service

I'd like to set up a dhcp server which normally relays to a central site, but has a pool of addresses to hand out if the link to the central site goes down. I'm using isc dhcp server on Debian, but ...
1
vote
0answers
63 views

Run generic Windows Service with affinity for the Primary Replica of an SQL Server AlwaysOn Availability Group

Is it possible to configure a generic Windows service in a Windows Server Failover Cluster such that the service always runs on the same machine as the Primary Replica (read/write) of an SQL Server ...
0
votes
1answer
118 views

OS X server Open Directory fail over successfully but not the user home directories

We setup the OS X server Open Directory(OD) master and replica. Users are created on master and their home directories are on the master server. When the master OD server is down, the OD client (MAC) ...
2
votes
0answers
732 views

Error getting the list of sites from the target environment: An invalid dn syntax has been specified

Trying to add another (second) Domain Controller to an existing Domain. In the second step of "Active Directory Domain Services Configuration Wizard" getting the following error: Error getting the ...
1
vote
2answers
186 views

Which method can I use to automate DNS-failover with monitoring?

We're operating multiple redundant servers across the world for latency reasons. Currently if one site goes down, our only way to let another site take over that region is through DNS. We would like ...
0
votes
1answer
900 views

Softlayer HAProxy with failover

I have 2 virtual servers on Softlayer, both running HAProxy. I am trying to set up failover with keepalived. Each server has a private IP and public IP, and they are on the same VLAN. I've tried many ...
0
votes
2answers
2k views

Failover pacemaker cluster with two network interfaces?

So, i have two test servers in one vlan. srv1 eth1 10.10.10.11 eth2 10.20.10.11 srv2 eth1 10.10.10.12 eth2 10.20.10.12 Cluster VIP - 10.10.10.100 Corosync config with two interfaces: ...
1
vote
0answers
2k views

monitor of systemd resource with pacemaker & corosync returns “not running” when cloned while it is

The setup: - OS: CentOS 7, latest versions op Corosync, Pacemaker & PCS - two node active/active cluster with a virtual IP - on both nodes Exim is running for outoging mail (SMTP), nothing special ...