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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2
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4answers
96 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
vote
0answers
164 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 ...
6
votes
2answers
2k 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. ...
0
votes
1answer
37 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 ...
3
votes
2answers
799 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: ...
1
vote
4answers
108 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 ...
3
votes
2answers
823 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 ...
5
votes
3answers
2k 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 ...
0
votes
1answer
1k 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
vote
1answer
598 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 ...
0
votes
0answers
63 views

Can I use pound to fail-over to a different site/location?

We recently opened new offices at a separate location/state and I want our web services to fail-over to this new site/location. Is it even okay to do this over the internet (no VPN)? Would pound ...
1
vote
1answer
126 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 ...
0
votes
0answers
139 views

proxy server with failover on string detection

I am looking for a proxy server with failover on string detection. I have a 3rd web application that fails and displays an error message. Since the server is "technically" up DNS failover doesn't ...
3
votes
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
vote
2answers
94 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 ...
6
votes
6answers
4k 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
votes
1answer
118 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
vote
0answers
34 views

Centralised CRON [duplicate]

Possible Duplicate: How to perform cron jobs failover? I am running a system in a distributed environment, where I have 10 nodes running our core application, with a couple of database ...
1
vote
1answer
98 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 ...
1
vote
2answers
720 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
vote
1answer
104 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
vote
1answer
174 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
5k 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 ...
6
votes
1answer
4k 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: ...
1
vote
0answers
148 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
votes
1answer
197 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
vote
1answer
342 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 ...
2
votes
2answers
135 views

DRBD(-alike) solution to enable failover for spool files

Im about to setup a failover-setup for our Kannel service using hardbeat and DRBD. One machine is the primary one, when that one dies/goes down, it switches to the secondary. Kannel is using a spool ...
1
vote
1answer
455 views

NFS failover WITHOUT DRBD?

So I am trying to set up a redundant NFS share in a cloud environment(all links internal, half gig links), and I am looking into using heartbeat for failover, but all the guides seem to be about ...
4
votes
2answers
1k views

Multiple LDAP servers with mod_authn_alias: failover not working when the first LDAP is down?

I've been trying to setup redundant LDAP servers with Apache 2.2.3. /etc/httpd/conf.d/authn_alias.conf <AuthnProviderAlias ldap master> AuthLDAPURL ...
0
votes
0answers
54 views

SQL Server 2008 failover clustering

Yesterday a power surge took out our SQL Server. Had to have the motherboard replaced and everything. Not good. Anyway, I'm now looking into failover clustering to prevent such an event from ...
0
votes
2answers
2k views

Adding redundancy to Hyper-V without a SAN

My organization has two identical servers, HP ProLiant DL380 G5. We do not have a SAN device. Each server has 8x 146GB HDD, and 48GB RAM. One server is currently configured as an Exchange server. ...
-1
votes
1answer
65 views

Redundant Connection Issue

I'm trying to set up a redundant connection for our web hosting servers. I have a BGP-capable router connecting two lines from two separate ISP's, one fiber (primary), one DSL (failover). I've already ...
2
votes
1answer
101 views

Failing back from DNSSec to regular DNS

A disaster recovery plan has been proposed in a client's company that would fail back from DNSSec to regular DNS in the event of 1) A major site outage requiring the change of many DNS records 2) ...
1
vote
1answer
279 views

SBD killing both cluster nodes when there are even small SAN network problems

I am having problems with stonith SBD in a openais-based cluster. Some background: The active/passive cluster has two nodes, node1 and node2. They are configured to provide an NFS service to users. ...
1
vote
2answers
244 views

How can I use a backup internet circuit for incoming services/applications?

Current: Primary ISP - fiber Backup ISP - DSL We have various apps/services like VPN, email, etc. that come in on various external IPs on the primary ISP. Is there a way without BGP peering to ...
1
vote
0answers
317 views

Windows 2003 cluster: One node offline causes the cluster service on the other node to fail

I configured a 2 node cluster on 2 Windows 2003 machines with Exchange 2003 The resources: Majority node set Data volume Cluster IP Cluster network name Exchange 2003 system attendant (and all ...
-3
votes
3answers
606 views

How to failover to another web service automatically?

I've got a 3rd party off-the-shelf windows application that needs to connect to a Web Service (IP address or URL) installed onto another server (actually running on Windows 7 Professional). My user ...
1
vote
3answers
70 views

Building right system for my needs [closed]

I will be providing "File-Hosting" service and I need something that works with me along the line and allow the project to expand. At first I was thinking about one big server with RAID 5 as a ...
0
votes
3answers
271 views

Manage DNS outage

I have been using ZoneEdit to manage my DNS. This has been generally fine except I did have a half our outage where two of their DNS servers were down causing my site to be inaccessible. What is the ...
1
vote
0answers
32 views

network card failover [duplicate]

Possible Duplicate: NIC Active/Passive bonding with priority I have dell poweredger server with fiber ethernet port and normal ethernet port. I have to configure same IP on each port ...
1
vote
1answer
124 views

Hyper-V Manager/Server failover/redirections

I have currently one Hyper-V Server 2008 R2 server installed, it's successfully running 4 VM's, but memory/RAM is starting to become sparse. I actually have a 2nd machine available, so my great idea ...
2
votes
3answers
1k views

PG pool failover leads to two independent masters with network failure

I've got two servers set up with PG Pool to create a HA setup for a webapp. PGPool and postgres run on both servers, using streaming replication from server 1 to server 2. The webapp on each machine ...
3
votes
4answers
6k views

AlwaysOn SQL Server 2012 - any option for true active/active?

I'm about to upgrade and consolidate a group of SQL Server 2008R2 to a single SQL Server 2012. I want have high availability and looking for the different options. The number of databases is fairly ...
1
vote
0answers
245 views

ISC-DHCPD failover, Modifying host definitions via OMAPI

Background: I'm working on replacing my single DHCP server with 2 in a failover configuration. When I do a DHCP request I see the lease is created in both dhcpd.leases files on each server. However, I ...
1
vote
2answers
153 views

Cloning IP address and/or MAC address for server fail-over

I am currently providing some web applications to my customers (apache/php/mysql on Windows server). I'm looking to provide some sort of fail-over server in the case my server has a hardware failure. ...
0
votes
1answer
584 views

httpd server is not starting

I am implementing failover mechanism in JBoss from here I added following line in httpd.conf file LoadModule jk_module modules/mod_jk.so Now I am getting following error while starting Apache ...
-1
votes
1answer
102 views

Windows Server 2008 R2 Cluster with just two nodes

May be this question was already made, but I dont find an exact answer to my dilema. I have a consulting IT job, my client have only 2 servers (16GB RAM, 2 Xeon 5160 and 500GB HDD) and him want to do ...
15
votes
5answers
1k views

When my A web server gets unplugged, how do I automatically redirect all the users to my B web server in another city, and vice versa?

When my A web server gets unplugged, how do I automatically redirect all the users to my B web server in another city, and vice versa? A load-balancing switch does what I want, except I can't figure ...
1
vote
2answers
117 views

Advice re simplest possible windows servers with failover capability?

I am supporting a company sells things to the public in three stores. At this time, the main site has two servers (file + AD server, and citrix server), and the other locations have one server (all ...