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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What is a good solution for failover when all I have is 2 physical servers?

I have 2 physical servers, each with 32GB RAM and 2 quad core procs. Each will run VMWare, 4 VMs each, one DB, 1 app server, 1 task queue server, and one general purpose server. One will run my web ...
2
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1answer
268 views

Akamai Website Fail-over trigger

My organisation currently has 2 data centres from which it hosts its corporate website, with Akamai providing load-balancing, and other CDN services. Now, I'm told that if our server stack in 1 data ...
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1answer
110 views

Active node stops resources when pasive node is shutdown

2 nodes, active/pasive. 2 resources, a virtual ip, openLdap, and the nfs mount where openldap saves the data. When both nodes are up, things worked fine. You could move resources away and put the ...
0
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1answer
67 views

Website caching failover service [closed]

A while back I remember reading about a service that provided failover support for websites. I never got around to reading specifics and now I can't remember the name of the service. Does anyone have ...
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2answers
290 views

RAID 1 Failover

Given two disks in a (hardware) RAID 1 configuration, what exactly happens to a production system when one drive fails? Is there any noticeable service interruption, or will the system continue ...
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2answers
608 views

Linux server failover

I have two Linux servers (CentOS6) - both are identically configured connected to the same switch with a direct link between them. I only have one external IP that is assigned to eth0 on both servers ...
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1answer
136 views

Are self Self-healing Cloud and Traditional Failover Boxes basically the same?

Does it still make sense to setup your own failover system (HAproxy + 2 or more servers for example) when self healing cloud seems like a practical solution? They seem to do the same job or am I ...
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1answer
585 views

DNS failover in a two datacenter scenario

I'm trying to implement a low-cost solution for website high availability. I'm looking for the downsides of the following scenario: I have two servers with the same configuration, content, mysql ...
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2answers
101 views

Methods to remotely change virtual IP of server

I'm intending to use virtual IP for my failover implementation. Setup: *Server A (192.168.0.1) * - takes virtual IP of 192.168.0.10 by default *Server B (192.168.0.2) * - takes virtual ip of ...
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1answer
121 views

VPN redundancy, failover

I am making a project for school with 3 offices wich are connected with vpn, the main server infrastructure is located in the head office and i am trying to remove all the single point of failures. ...
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3answers
1k views

Linux WAN failover simple solution needed

I'm banging my head against the wall to come up with a clever and simple solution to WAN failover. This is for a SOHO installation with two different external IPs. Only outbound connection failover ...
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4answers
4k views

Nagios: Is it possible to have multiple IPs for a host?

In our office we have dual WAN setup, if our cable connection drops we still get connectivity via our T1. The only issue is that our office network is no longer available on the same IP so all Nagios ...
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1answer
373 views

Wireless LAN Bridge with WAN VPN Failover

My network is below, it's currently just an ordinary 192.168.0.0/24, the branch offices needs to have access to resources on the main site. Currently all internet traffic go across the bridge and ...
4
votes
3answers
2k views

Should the SAN (Dell MD3200) management port be on the same subnet/VLAN as the failover cluster private subnet/VLAN?

So, I'm getting a bit confused here. I have a Dell MD3200 SAN with dual controllers. Each controller has an Ethernet management port that connects to a switch. Together the two controllers connect to ...
3
votes
1answer
93 views

Our datacentre is forcing us to change IP addresses, what is the best way to take advantage of the period when they're both active (failover gateway)?

The subnet of IPs the datacentre gave us was apparently on loan, so they assigned us a new block and gave us two weeks to swap them over, during which both will be active. They're on totally different ...
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2answers
494 views

Several load-balancing servers listening on single IP/port?

Let's say I have a fully working, load-balanced application server environment. All servers have to fail-over gracefully. It's relatively easy to do with the application servers, but how can I ...
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6answers
3k views

Ubuntu failover from Ethernet-to-ADSL-modem to USB 3G dongle

I have an internet connected Ubuntu server, connected by Ethernet to a residential ADSL line. This is adequate, most of the time, but I can't rely upon the ADSL link to be as reliable as I'd like. ...
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0answers
224 views

Cisco 2911 - BDSL/3G-HWIC - How to failover to 3G if BDSL offline?

We have a site where we have a cisco 2911 router. Said router has BDSL provided over ethernet and a 3G-HWIC for redundancy. At the moment this is manually failed over in the event of a BDSL outtage, ...
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2answers
550 views

Multi-site high availability

We have a SaaS application that we need to be highly available. We already have an expensive, well-maintained Hyper-V failover cluster, but today the datacenter where we host that cluster had a ...
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1answer
275 views

redirect to a static page on another web server when main web server is down

We have a single IIS web server in house that when it goes down we would like to redirect traffic to another web server and display a message that the web site is down. I have been all over the net ...
6
votes
1answer
3k views

Pacemaker Active/Active haproxy load balancing

I am using Haproxy to load balance replicated mysql master servers. I am also using Heartbeat and Pacemaker for Active/Active ip failover with two virtual ips on the two load balancers for web server ...
0
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1answer
51 views

Advanced SQL Setup

Got a major issue that I need some help with. Here is the situation. The client has multiple web sites hosted on multiple web servers (virtual machines) running on multiple virtual hosts that ...
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2answers
51 views

Howto switch ISP provider? [duplicate]

Possible Duplicate: Office network failover? I have a office LAN providing internet access to several workstations, each workstation it is basically connected to the hub that it is ...
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2answers
728 views

How do I do IP Failover for my Public IP address with Linux HA

I did a lot of experiment with heartbeat, corosync and pacemaker for IP FailOver which I have to do with Public IP. I did more than one ip failover(VIPs) with two nodes, also with three nodes BUT ...
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1answer
904 views

DNS Failover when Datacenter is dead

I'm just trying to configure my DNS server to switch the DNS entry in my DNS server (bind) if a server becomes unreachable. Is there a simple tool that I can use to do so?
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1answer
225 views

mysql/web server failover setup using reverse proxy

I have two webservers and at the moment have DNS - Round Robin setup so that they are somewhat 'failsafe' this was only ever a temporary failover solution and I am now looking at a more permanent and ...
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2answers
186 views

Dynamically re-route specific traffic on NIC failure in Linux

This is my first question on this forum. Hope I will be able to help others in the future. I have two boxes with two NICs each. I know that using bonding I can have some degree of fault tolerance ...
4
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2answers
4k views

How good is failover of the iSCSI target on a two-node linux san?

I'm evaluating the possibility to use two off the shelf servers to build a cheap iSCSI redundant SAN. The idea is to run linux, pacemaker, and an iSCSI target - something like the SAN Active-Passive ...
1
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1answer
247 views

How to connect drive array to redundant motherboards?

How should one connect a small storage array, four 3TB SATA drives for now, to two motherboards or controllers as a failover system? This means avoiding adding another single point of failure such as ...
3
votes
1answer
1k views

Heartbeat Pacemaker 3 node/ip failover

I have setup two node active/active ip failover with heartbeat and pacemaker following the link at zivtech on the two load balancers for the backend web servers. Two LBs has public ip each which is ...
4
votes
4answers
2k views

DNS Round Robin: Do browsers stick to one IP as long as it is online?

How do most browsers behave if they get multiple A-records from the DNS server? Do the stick to one IP as long as it is reachable (and only use another if the IP is down)? Or do they switch all the ...
3
votes
3answers
230 views

Two server with same data in case one goes down

I actually own two linux web servers and I was wondering how I could make them work together in case one goes down. From what I found, cluster seems to be the closest, because it would replicate the ...
0
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1answer
130 views

How to approach high availability and fail-overs when moving to a vmWare cloud server/cluster

I'm currently running a CentOS VPS with some simple web/DB/VPN servers, but I'm planning to move to a vmWare Enterprise cloud based machine in the near future to improve availability, and I need to ...
1
vote
1answer
484 views

Heartbeat ip failover on Ubuntu

I have 3 servers, 1 as load balancer and 2 as web-servers(apache tomcat) hosting some jsp pages. I want to add one more load balancer in active/passive mode to avoid SPOF and below is the expected ...
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3answers
3k views

How to configure ubuntu server with 2 NICs, and 2 Gateways (2nd as a failover)?

Here is a basic overview of the network configuration for one of our servers: [Datacenter] [Internet Connection #1] >> [Firewall 1 (xx.xx.xx.1)] >> [Server (xx.xx.xx.10)] ...
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1answer
942 views

Tomcat mod_jk cluster skip 404 http status

I am trying Tomcat Clustering with mod_jk for months and so far not so bad but facing a problem during deployment. I am using FarmDeployer to copy and deploy the WAR to other nodes in the cluster but ...
3
votes
1answer
436 views

Adding the IP Failover on FreeBSD

I've just bought a dedicated server in OVH.com and they are sending me some warnings in email that I haven't configured my IP Failover address correctly and they're going to block this failover within ...
0
votes
2answers
813 views

Will traffic get through a standby firewall if the active firewall's interface to the gateway goes down?

Here is the scenario. I have two ASA 5510's in Active/Standby. Each of them has a single uplink to one of two routers (HSRP1 and HSRP2) configured in HSRP. Disaster strikes and the interface ...
2
votes
1answer
384 views

Cisco ASA force failover from command line

I have 2 independent traffic routes to my servers. They are serviced by a failover Cisco ASA5505 pair. However, should my gigabit switch on the main route fail (or main internet feed), the ASA will ...
0
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1answer
487 views

Cisco IP SLA monitor failure on tcpConnect but the host can be telneted from router

I want to configure a failover link to my cache server with Cisco policy routing. So I attempted to create an ip sla monitor. here is the syntax in the cisco router (there is possibility of being ...
0
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1answer
487 views

How to adjust ASA Failover Times?

I want to adjust my failover poll timing. The proposed column is what I am wanting to set it up as. I believe the following commands will obtain what I want from the first two rows but Im not sure ...
0
votes
2answers
2k views

heartbeat: find out machine's status within a cluster?

I'm trying to do some heartbeat debugging. Is there a simple way to ask a machine whether it thinks it's part of a cluster, and whether it's the master or the slave? I've tried $ heartbeat -s ...
2
votes
1answer
1k views

heartbeat: Bad nodename in /etc/ha.d//haresources [node1]

I'm trying to start heartbeat on Ubuntu 10.04 with service heartbeat start, but getting the following errors: heartbeat[24829]: 2011/11/22_19:31:07 ERROR: Bad nodename in /etc/ha.d//haresources ...
0
votes
1answer
545 views

Heartbeat (without ldirectord etc) for a floating IP address?

I have two load-balancing servers running mod_proxy_balancer. Each server balances between two web servers. Now I'd like to find a way to share a single IP address between those two load-balancing ...
1
vote
2answers
668 views

keepalived questions (requirements, abilities, limitations)

1) What are keepalived's (physical/network) requirements? Does the two (or more) keepalived' nodes need to be connected to the same switch? (something related to broadcasting maybe). 2) Can ...
1
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1answer
263 views

Windows Server 2008 R2, IP Failover with 1 server and 2 isp's

I have a Windows Server machine that I have 2 nic's that are connected to 2 different isp's. Our DNS is hosted externally. What I am trying to do is set it up where when one isp goes down the 2nd isp ...
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2answers
355 views

SSD redundancy via HDD

Is there a way to guarantee redundancy to an SSD using an HDD? Raid 1 is the best choice to guarantee redundancy in HDDs, but SSDs are too expensive to guarantee redundancy via RAID. If I was to ...
0
votes
1answer
231 views

How to use AppScale

There are some wiki which explain how to install and setup AppScale. But I didn't find anything related to the extensive use of AppScale. I mean, what to do in case of major outage ? If the node ...
0
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2answers
102 views

port check - forward and fail over

I am looking for simple fail-over solution. If the 92 server is down, the application should point to 91 server. I can check the connectivity by scripting the following commands. [root@sserver ...
1
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0answers
408 views

Kerberos high availability failover, Apache Mod_auth_kerb, Using the Kerberos slave is slow

We host our own Redmine rails web application internally with Apache using Mod_auth_kerb and our internal Kerberos for authentication. We have 2 internal Kerberos servers KDC1 and KDC2. KDC1 is ...