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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2k views

Sharing storage between DFS nodes providing failover without failover manager

I'm currently consulting for a small engineering firm that has been using a single server for all their domain needs and their management has got sick of not being able to access networked shares from ...
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1answer
127 views

Ip-failover and geolocalization

I have a server (from OVH) located in France with French ip. However most of the people coming to my website are from Poland. From what I read having a Polish ip address could lead to better search ...
3
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2answers
1k views

Azure Load balancing internal instances of web/worker roles?

As far as I know Azure does not have a load balancer for internal services, internal endpoints are not load balanced. But can someone have implemented a "soft" solution, or can advice me some helpful ...
0
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1answer
178 views

Setting up apache + mysql + exim on new servers. Redundancy/HA/Failover?

We are currently moving our single Linux server to a few other physical Linux servers, and would like to take the opportunity to have some more failover options. Backups are fine, and we don't ...
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1answer
107 views

Configure Jenkins for LDAP failover [closed]

I was wondering if anyone has successfully configured Jenkins with two LDAP servers so if one server fails, it will query the other server?
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1answer
585 views

How to make active/passive jboss resource in pacemaker

I want to configure my pacemaker for jboss server. I have 2 nodes with mysql master/slave configured. The problem is I want to start jboss on node which is located master database. The one possible ...
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1answer
517 views

Cisco ASA failover can't ping gateway

I'm currently trying to set up a failover network for my Cisco ASA 55x0 using the SLA traking. I have the "outside" interface (network 89.x.x.48/29) and the "outside2" interface (network ...
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1answer
126 views

Detect if the original node failed in tomcat cluster

I have two nodes in a cluster. Node1 initially servers requests. Loadbalancer redirects the request to node 2 if the first node fails. I would like to know if there is a way for the Node 2 to detect ...
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1answer
475 views

Secondary fallback/failover network on Cisco ASA

In my network there is a Cisco ASA 55x0 with "inside" interface (network 192.168.79.0/24) and "outside" interface (network 89.x.x.48/29) There is this nat rule: object network NAToutside nat ...
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1answer
2k views

Configuring HAProxy with memcache with failover

I'm configuring a new set of servers for an existing Wordpress site, and it's been requested that memcache be available and made more resilient. The idea proposed is to have HAProxy send requests to ...
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0answers
705 views

Server 2012 cluster - SAN volume - failover not working

The following configuration is available: - 3 HP SAN disk Enclusores / 2 SAN controller; HSV200 (FC) - 2 HP Brocade SAN switches - 2 HP blade servers, each with a QLogic FC HBA QMH2462 - SAN volume is ...
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1answer
752 views

VPN Failover Cisco ASA 5505

So basically we have a Cisco ASA 5505 (we have inherited this from a customer, none of us have any experience with Cisco's). Now essentially we have to WAN lines which we have setup in Failover, via ...
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2answers
154 views

Performance penalty when using CNAME

We are using the current CNAME record for a server, i.e. foo.example.com => CNAME => server1.example.com server1.example.com => CNAME => ec2-34-142-138-31.compute-1.amazonaws.com ...
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1answer
815 views

AWS EC2 Mailserver Failover Strategies done right

I'm researching in this topic really hard the last few days and i just want to discuss this with a few specific questions - i did not find any suitable thread here that is covering my needs and ...
3
votes
2answers
77 views

Is it possible to have automatic failover of a windows service without windows clustering?

Due to a partial failure of our SAN we have switched our message queuing (Active MQ) from using network storage to using local storage. Because the secondary server is no longer sharing the same ...
2
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0answers
706 views

Openldap Mirror Mode replication failover

We have currently one master ldap server and around 400 slave servers which are partially replicated through that master.All openldap versions are same and 2.4.31 What we want is actually if master ...
1
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2answers
522 views

Infiniband, SRP and failover

I am considering an linux-based infiniband storage setup, but I am tripping over whether or not I can do active/passive or active/active failover with DRBD and SRP targets. I am led to believe that ...
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1answer
243 views

Bond0 Failover when link light stays up: High Availability Network

Configuration: Two switches, each with a separate internet route Centos servers with eth0 and eth1 bonded as an active-backup on bond0, eth0 in on switch and eth1 in the other /etc/modprobe.conf ...
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2answers
878 views

Single Static Public IP FAILOVER to Other PUBLIC IP Address

We have a customer that has a windows server located behind a dual wan router that has two static IP addresses from each ISP. They have staff out in the field that have laptops with applications that ...
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1answer
290 views

Memcached distribution

I have a question about memcached distribution across nodes. We have 20 memcached nodes with 200GB memcached on each. Our apps are PHP apps. $memcache->setOption(Memcached::OPT_DISTRIBUTION, ...
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1answer
482 views

Setting up a failover web server, off site

I've read so many articles, posted a few SF, but I can't find a solution that seems to cover everything. It doesn't seem as black and white as setting up and AD and installing DFS to replicate ...
0
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1answer
598 views

How can I solve the “split brain” issue with only 2 physical servers?

I have 2 physical servers, each will contain 2 VMs; a VM with Postgres (9.2) running, and a VM running some Python software (which will connect to the Postgres server). I'm not tied to anything in ...
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0answers
300 views

How to bind CIFS server to virtual IP in Windows Server 2012?

I'm a unix guy who is new to clustering with Windows. I have two Windows 2012 servers that have the StorNext clustered filesystem mounted as drives on each. If I try to add the File Sharing role, I ...
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votes
1answer
28 views

How to set up always on server that directs between two URLs?

I have two urls: myurl.co.za myurl.net And a 3rd url: myurl.com Depending on different times of the day, I want users to be redirected to either myurl.co.za or myurl.net. I have a program that I ...
1
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2answers
408 views

Server 2012: how to plan for storage failover?

The Stuff I have the following components to work with: two rooms two beefy Dell R510s, one in each room two EMC VNXe storage devices, one in each room. The goal Ensure that if one server room ...
2
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1answer
368 views

SQL Server 2008 R2 Failover Clusters behaviour on multiple failures

I'm testing the resilience of one of our test systems. We have 2 x DB (SQL 2008 R2 on Server 2008 R2, running in ESXi VMs) arranged in a Failover Cluster. Shutting down the Active SQL Server service ...
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0answers
140 views

Solr on a two node Jboss cluster

Are there any issues with deploying Solr on two node jboss cluster with the index shared on a NFS mount point? We would like to do this for high-availability across data centers.
0
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1answer
299 views

What's the best way to run HAProxy backup as another HAProxy server and avoid cyclical issues

I have several geographical regions for my service deployment, say Region1, Region2, and Region3. Each region has a failover haproxy instance. Each haproxy is configured with several backend servers ...
3
votes
3answers
5k views

A-Record Failover?

I have a Fortigate 100D with 2x BT Business Infinity Fibre connections acting as WAN1 & WAN2. The BT lines come with 5 static public IPs each and I have my DNS hosted through CloudFlare pointing ...
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1answer
261 views

Is there a linux remote fs driver (nfs/sshfs/cifs/etc) that also keeps a local copy and fails over to the local copy?

I need to keep some static web mirrors synced in as close to realtime as possible, but I also want it to be somewhat fail-safe (or at least not obvious to the visitors), so if the file server goes ...
0
votes
2answers
492 views

MongoDB Failover Time

I have a MongoDB 2.4 replica set of six nodes and an arbitrator running in a test environment. I was testing the fail-over response time and it was around forty-five seconds. Keep in mind, reads are ...
1
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1answer
483 views

Xen XCP: Route failover IP to Guest

I have two hosts, which I installed XCP 1.6 on. The machines are hosted at Hetzner. Each host currently has a public IP and an additional IP assigned. There is a guest on each of the hosts which ...
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2answers
417 views

Failover Azure VM running SQL Server?

I'm currently looking at hosting an SQL Server database on an Azure Virtual Machine Instance and connecting the website via two load balancing web-roles. Due to various limitations in our application ...
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2answers
907 views

One website, two public IPs, each IP on separate line, how to do failover

We have a website that sits behind two firewalls, main and failover. Main and failover firewall have different IPs, and different Internet connections from different providers. How to provide failover ...
0
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1answer
906 views

Tomcat Failover High Availability (active / passive)

we have a jee web application running on apache tomcat , we need to deploy this application on production environment and we decided to use failover structure so we have one server active and another ...
2
votes
1answer
2k views

keepalived 2 VIP and 2 servers

Is it possible to configure keepalived in such a way? In normal state VIP_1 assigned to SERVER_1 and VIP_2 assigned to SERVER_2 On server failure all VIP's going to working server, and after failed ...
2
votes
2answers
939 views

Setting up Hyper-V Server 2012 with active/active failover

I want to set up Hyper-V server according to the following: I want the Hyper-V server to, if both interfaces are up, to use the NIC connected to Switch A for storage traffic, and the NIC connected ...
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votes
1answer
7k views

CentOS Dual WAN - Load Balance and Failover

I am setting up a Linux server (CentOS) to act as a router with load balacing and failover (when one internet line is down, another one should take over). The clients conected to eth1 ( LAN ) should ...
0
votes
2answers
86 views

Azure Table Storage mirroring

I am proposing an Azure environment with the following: VM SQL Server for core relational data Table Storage for bulk data I want to mirror the SQL Server database to another server so that ...
7
votes
1answer
3k views

nginx failover without load balancing

I'm having trouble configuring nginx. I'm using nignx as a reverse proxy. I want to send my all requests to my first server. If the first server is down, I want to send requests to second server. In ...
1
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1answer
334 views

Multisite WAN Failover

We are looking for a Debian Squeeze, opensource multi site "wan fail over" solution (apologize if a post for this exists - didn't see one). Multi site is key.... In a Small Office context, we want ...
3
votes
3answers
817 views

Haproxy on server failure event

I've got a setup with one HAproxy server (frontend) and multiple web-servers (backend). Is it possible to configure HAproxy so that a script is executed when a web-server gets down?
1
vote
1answer
3k views

Fail-over VPN with two ISPs and Cisco ASA 5500 Series

We have a couple of branch offices that need to connect to a main site. We plan to use Cisco ASAs 5515 to establish VPN connections. We would also like to have 2 ISPs at each location to make the ...
0
votes
1answer
259 views

Simple failover: Use NAT? (Network Address Translation)

We have a Windows Server 2008 server which needs very high uptime. We want failover in the event we need to take it offline for some reason, ex: hardware update, software update, etc. It runs mostly ...
0
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1answer
904 views

Exchange DAG fails over during backup

It seems like every night during our backup process, the Exchange DAG fails over. Is it possible to change a tolerance setting to prevent the DAG from unnecessarily failing over during backup times?
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1answer
818 views

Dual Linux NFS Server Failover - nfsv4leastime / nfsv4gracetime

first time here posting, i hope i won't do many mistakes. I've a setup with 2 NFS server. They're using corosync/pacemaker + drbd to offer active/passive nfs server. Distro used is Ubuntu latest LTS ...
0
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1answer
97 views

What is the easiest way to obtain a script-driven hot failover system?

I need to reconfigure a prod env to provide hot failover for a db driven web app written in Perl that is currently running on an Apache HTTPD server, on a Linux OS. The app is not designed to run in ...
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0answers
299 views

Unable to remote desktop using failover cluster name

I am using Microsoft Failover Cluster and I have 2 nodes - say node1 & node2. The nodes are successfully accessed by remote desktop. but the cluster name is not accessible. The cluster name is ...
2
votes
2answers
905 views

MongoDB replicaSet failover incurs 1000x query response time increase

I'm testing a production MongoDB replica set failover. When I manually fail one of the instances I see an approx. 1000x (one thousand x) decrease in response times of my PHP queries. I'm on the ...
0
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1answer
65 views

one website on 2 servers [closed]

i want to put my website on 2 servers, When server #1 is down, my site loads from server#2 . How can i do this? i want this 2 servers synced realtime... is there any software for this? or any trick? ...