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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93 views

Is failover with only two servers possible?

I'm trying to set up a basic high-availability solution with HAproxy and mysql. Currently it looks like this In case of host1 failing, the host2 is supposed to get it's IP and traffic (using feature ...
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1answer
542 views

Hyper-V Redundancy without Domain

We currently run a Hyper-V server on a non-domain W2008 server, and are looking to build a failover solution. Because all the (6-10) VM guests are linuxes, and our datacenter space is 90% non ...
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1answer
220 views

HA Options for Windows Servers

We are looking at different options to allow us to stay up and running when our primary datacenter (DC1) goes down for any reason. What is the main difference in having a offsite server updated all ...
0
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1answer
295 views

How to setup a failover solution for Windows 2003 SMTP Server?

I'm currently running Windows SMTP Server on a rented Windows 2003 Server VM. There are times when my hosting company network is down and my clients can't send their emails via the SMTP Server host I ...
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1answer
523 views

Linux HA Heartbeat Virtual IP Switching with domain name linked to it

I have heartbeat set up on two servers like so: Master: 10.15.1.50 Backup: 10.15.1.51 (Virtual IP: 10.15.1.52) So, the master always has 10.15.1.52 as well, but if it goes down, the backup will ...
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1answer
690 views

Hyper-V R2 can't add a teamed NIC as External Network

I have a Dell PowerEdge R710 running Windows Server 2008 R2 Datacenter and which was part of a Hyper-V Failover Cluster. It has 8x Broadcom BCM5709C NICs and three are teamed together to be my ...
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2answers
68 views

Is a virtual IP assigned by a hosting provider?

I'm going to be setting up HA proxy with 2 physical servers, using heartbeatd. I'm going to have clients point domains to an IP address which can't change after doing so. My hosting provider has ...
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4answers
294 views

IIS: How do you handle Windows reboots?

We have one VPS (Windows 2008 R2+IIS7.5), with an asp.net mvc 3 application. The main question is: how to handle issues when Windows needs to reboot? (after installing Windows Updates or anything ...
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1answer
104 views

Relying on shared disks for heartbeat

I read somewhere that using shared disks for heartbeats is reliable even if network totally fails. I read it in the context of remedy from split-brain. Is this correct? But I can not understand this. ...
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1answer
107 views

Nginx reverse proxy: How to serve 'back soon' html file while backend server restarts

I have a WSGI server behind by nginx. Say I bring the WSGI instance down for maintenance/update, is there a nice way of nginx automatically serving up any requests to that application with a specified ...
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1answer
150 views

Software load balancing fail-over vs hardware [closed]

Please correct me, but my understanding is that with software load balancing a service must be run on each server while there is one DS that notifies the other servers that a server has gone down and ...
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1answer
710 views

DC/DNS failover with global/common DNS roundrobin

I think I am getting lost in network failover land. I am trying to set up a Windows Domain Controller and DNS, while providing resilients and failover. I have two Domain Controllers and DNS servers. ...
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5answers
4k views

Many ISP's is block port 25, how do I choose an alternative port?

I am building an application that will be acting as a combined MUA/MTA on different networks. However, many of the networks are with ISP's that block port 25 for SMTP. Therefore I would also like to ...
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3answers
394 views

Apache failover for JBoss

I am running a JBoss web app (AS 6 Final) hosted on linux (Debian). I would like to implement a failover solution so that when JBoss is down, a static web page is served in its place. My current ...
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1answer
382 views

Nginx automatic failover

How do I setup Nginx on two machines so that if the primary machine crashes there is automatic failover to the 2nd machine? And what are the best practices here? There seems to already be a lot ...
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2answers
141 views

What is a reliable device to detect, from the outside, if my internet connection has gone down?

We host some web sites on servers in our office. We have two internet connections, a primary and a backup connection (with separate IP address ranges.) We need to be able to detect, from outside our ...
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1answer
3k views

Force failover a Cisco ASA

I have two ASA in a lan state primary\secondary configuration. None of them have "failover active" or "no failover active" in their configuration. Would it be proper to failover in a manner such as: ...
1
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1answer
602 views

postgreSQL replication and failover with repmgr on Ubuntu

I'm new to Linux and have been tasked with setting up a redundant Linux DB server with PostgreSQL. preferably the fail-over needs to be automatic, but a manual process will be fine for now. What I ...
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1answer
193 views

Router failover not detecting outside interface link lost

Suppose I have two routers configured in master/slave configuration. They look something like this (addresses are not real ones) 123.123.123.10 <===> [eth0] Router 1 (10.1.1.2) [eth1] ===> ...
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0answers
339 views

JBoss: switch domain in case of failure

In a cluster configuration of 2 different physical servers, managed with the domain setup, where one of the servers is the master and acts as a domain and the other is the slave and gets the ...
4
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1answer
71 views

Blackberry Outage: How can I PIN a large number of users?

We lost power due to the hurricane and need to notify BES users that services will be restored soon. How can I extract all BES users and send them a notification message? Also how do I alter the ...
2
votes
1answer
911 views

Best failover strategy for e-mail servers on AWS to ensure high availability

We have our e-mail server hosted on AWS. Last week Amazon had a failure in their East Coast region which brought down our server along with many others. We now want to implement a failover strategy ...
2
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2answers
162 views

Ways to do simple failover with one server and two IPs

The setup is one server (Windows 2008) at one location with two incoming connections. As the server has to interface with various on-site devices, and will have a small number of incoming ...
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1answer
976 views

Linux/Vyatta failover with GRE and OSPF/BGP

I have strange problem with routing failover in scenario: I'm trying do this failover via ospf or bgp, in both happens the same strange behavior with tunnels: For 192.7.0.0 TUN providing default route ...
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2answers
2k views

DNS failover across multiple datacenters?

I've got a site that is starting to get a lot of traffic and just the other day, we had a network outage at the datacenter where our loadbalancer (haproxy) is hosted at. This worried me as despite all ...
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1answer
402 views

Can Windows cluster failover a custom TCP Server application even when Windows itself is working?

I develop a TCP server application that listens to a specific port. One of my users is asking me if my application can run on an active-active Windows 2008 Enterprise cluster. Having only almost no ...
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4answers
98 views

Looking for a solid redirection infrastructre [closed]

We have critical servers (webservers and databases) that are fully replicated, except for the reverse proxy that we use to hide the internal stuff. This proxy is acting like a router that filters and ...
1
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0answers
235 views

High availability setup with 2 tomcat servers in Windows

I am trying to set up a high availability setup(not load balancing, only HA) with 2 tomcat servers. When I google for information, I get tons of links with apache+HAProxy+keepalived setup for linux ...
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2answers
3k views

Magento hosting on a budget

I have to do a setup for Magento. My constraint is primarily ease of setup and fault tolerance/fail over. Furthermore costs are an issue. I have three identical physical servers to get the job done. ...
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1answer
38 views

Secondary backup server

I've been given a task to implement a backup solution in the event of our website goes down. It is a dedicated server running centos 6. From what i've experience on our server, our server may go down ...
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3answers
1k views

Secondary DHCP server won't start on Centos 6.2

I'm trying to create a backup DHCP server. Server times are in sync. Primary server starts fine. Secondary server won't start. Error from /var/log/messages is: Sep 15 14:47:45 stream dhcpd: ...
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4answers
120 views

Just one client bound to address and port: does it make a difference broadcast versus unicast in terms of overhead?

Scenario: I am implementing failed over for a network node, so my idea is to make the master node listens on a broadcast ip address and port. If the master node fails, another failover node will ...
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2answers
1k views

DNS Round-robin, Load Balancing, Load sharing, and failover in 2012

I have been reading many posts on serverfault as well as on other sites regarding all these. What I understand is, Multiple A records(round-robin dns) can be used for both : Load sharing ...
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3answers
4k views

If DNS Failover is not recommended, what is?

As a followup question to his very popular question: Why is DNS failover not recommended?, I think it was agreed that DNS failover is not 100% reliable due to caching. However the highest voted ...
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1answer
2k views

Loadbalancing JBoss with haproxy AND mod_jk

I've been tasked to explore ways of building a very fail-resistant configuration for a professional application developed for JBoss. I have a somewhat fixed hardware configuration (servers have ...
1
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1answer
823 views

Sonicwall with failover, multiple subnets, and preferred WAN interface per subnet

I am trying to set up my Sonicwall TZ-210 as follows: Two WAN interfaces (different ISPs), set up in failover mode. Two LAN interfaces with different subnets Each LAN subnet will have a preferred ...
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1answer
176 views

MySQL Cluster Failover doesn't work

I have two servers, where First server 10.100.15.150: 1. one mgm server 2. one ndbd 3. one mysql api Second server 10.100.15.160: 1. one ndbd 2. one mysql api When i start all 'parts' of cluster ...
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2answers
2k views

Redis Master and Slave usage

While I know how to configure and run Redis master and slave on two different servers, I would like to whether my Webserver will be able to connect to slave redis server if the master redis server ...
1
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2answers
124 views

High available and secure FrontEnd to WebApps behind a firewall [closed]

my question is about proposed implementation of high available and secure FrontEnd to WebApps behind a firewall. The components of the network and their relationships are as follows: 1) 2 WebApps ...
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votes
6answers
7k views

Cluster failover and strange gratuitous arp behavior

I am experiencing a strange Windows 2008R2 cluster related issue that is bothering me. I feel that I have come close as to what the issue is, but still don't fully understand what is happening. I ...
0
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1answer
169 views

Stop Nginx from accepting new connections on error

I am running an nginx server behind a separate (L-4) load balancer that basically just serves static files and forwards requests to a downstream web server. This works great as long as all the ...
1
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1answer
147 views

failover with crm - current server

crm status is kind of confusing :-( Which of the 2 nodes is the currently selected one and which one is the alternative machine for failover scenario? crm status ============ Last updated: Sun Jul ...
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2answers
1k views

linux routing or natting with ip on loopback interface as alias

Ive got eth0:0 192.168.2.10 (for bgp network announce, no vlan, alias on eth0) eth0.1 192.168.3.20 (for bgp session 1,vlan3 transport to bgp router) eth0.2 192.168.4.30 (for bgp session 2,vlan4 ...
1
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1answer
142 views

Can not establish connection after adding the IP Failover

I've bought an dedicated server some days ago, and now its time to setup some more IP failovers to handle my services, unfortunately, it seems like I can not access certain ports anymore if I'm using ...
1
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1answer
222 views

How can I implement a high availability service with JBoss 5?

I've tried to implement a high availability service with JBoss and Apache. The architecture is: Apache | | | | JBoss1 JBoss2 There is a balancer implemented from Apache to the ...
3
votes
4answers
9k views

Link bonding across multiple switches?

I've read up a little bit on bonding nics with ifenslave; what I'm having trouble understanding is whether there is special configuration needed in order to split the bonds across two switches. For ...
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1answer
6k views

MySQL: Pacemaker cannot start the failed master as a new slave?

pacemaker-1.0.12-1 corosync-1.2.7-1.1 I'm going to setup failover for MySQL replication (1 master and 1 slave) follow this guide: ...
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0answers
161 views

keepalived - service not available on the 'passive' host

I've got ip failover configured on two hosts for a mysql (percona) cluster with keepalived; the failover works as expected, but I cannot access the service from the host that is passive or in ...
0
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1answer
214 views

hosted failover(proxy?) service - does it exist?

We're in the planning phase to make our web application services redundant. Right now we've got our own physical servers at a colo, running a VMWare cluster connected to an EqualLogic SAN. It's a LAMP ...
1
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1answer
625 views

IP failover on different subnets

I have two real servers, on different subnets, each one with a permanent IP, and with a failover IP that can be used by either server. The hoster provides an API with which I can assign the failover ...