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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438 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
407 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
94 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
360 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
1k 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
505 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 ...
2
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1answer
485 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 ...
2
votes
2answers
131 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
649 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
69 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
542 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 ...
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vote
2answers
416 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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0answers
37 views

How can I set up the most manual sort of failover possible?

I do not want my servers to automatically fail over, even if it means an hour of downtime. I have synchronous replication in my DB, and I have 4 servers (2 app and 2 database). How can I use virtual ...
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vote
1answer
218 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
541 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
225 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
374 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 ...
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1answer
437 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
223 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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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
vote
2answers
354 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
votes
1answer
294 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
115 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.
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1answer
264 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 ...
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votes
3answers
3k 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
199 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
323 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
vote
1answer
423 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
344 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 ...
1
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2answers
726 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
votes
1answer
703 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 ...
1
vote
1answer
1k views

keepalived 2 VIP and 2 servers

Is it possible to configure keepalived in a such 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
869 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
6k 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
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2answers
68 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 ...
5
votes
1answer
2k views

nginx failover without load balancing

I'm having trouble with configuring nginx. I'm using nignx for reverse porxy. I just want to send my all requests to my first server. But if the first server is down, I want to send requests to ...
1
vote
1answer
274 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
524 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
2k 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 ...
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votes
1answer
234 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
649 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?
0
votes
1answer
677 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 ...
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votes
1answer
88 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
246 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
784 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
votes
1answer
58 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? ...
0
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1answer
386 views

How to setup cluster of virtual machines to host web application with fail-over redundancy?

I would like to know how to setup a cluster of virtual machines to host a web application. We are expecting a high volume of clients connecting. I would like a cluster of virtual machines (or ...
0
votes
1answer
595 views

No Internet access after successful failover?

I am using pfSense 2.0.2 and want to set up a failover between my normal WAN connection (GW_WAN) and a 3G surfstick (GW_OPT8). I put both in a gateway group called WAN_FAILOVER: GW_WAN Tier1 ...
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votes
4answers
173 views

Achieving Five Nines

I am building a web application where uptime is key. I understand that 100% uptime is not realistic but I would like to achieve five nines. I'm unsure as to the most prudent way to accomplish this. ...
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1answer
186 views

Using Amazon route53 for high availability

Using Amazon Route53 DNS, is it possible to build a highly available setup pointing to multiple web servers not on Amazon? I don't need to worry about session stickyness. Let's assume I have two web ...