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 ...

learn more… | top users | synonyms

1
vote
0answers
120 views

dhcp relay with failover to local service

I'd like to set up a dhcp server which normally relays to a central site, but has a pool of addresses to hand out if the link to the central site goes down. I'm using isc dhcp server on Debian, but ...
1
vote
0answers
75 views

Run generic Windows Service with affinity for the Primary Replica of an SQL Server AlwaysOn Availability Group

Is it possible to configure a generic Windows service in a Windows Server Failover Cluster such that the service always runs on the same machine as the Primary Replica (read/write) of an SQL Server ...
0
votes
1answer
124 views

OS X server Open Directory fail over successfully but not the user home directories

We setup the OS X server Open Directory(OD) master and replica. Users are created on master and their home directories are on the master server. When the master OD server is down, the OD client (MAC) ...
3
votes
0answers
774 views

Error getting the list of sites from the target environment: An invalid dn syntax has been specified

Trying to add another (second) Domain Controller to an existing Domain. In the second step of "Active Directory Domain Services Configuration Wizard" getting the following error: Error getting the ...
1
vote
2answers
193 views

Which method can I use to automate DNS-failover with monitoring?

We're operating multiple redundant servers across the world for latency reasons. Currently if one site goes down, our only way to let another site take over that region is through DNS. We would like ...
0
votes
1answer
925 views

Softlayer HAProxy with failover

I have 2 virtual servers on Softlayer, both running HAProxy. I am trying to set up failover with keepalived. Each server has a private IP and public IP, and they are on the same VLAN. I've tried many ...
0
votes
2answers
2k views

Failover pacemaker cluster with two network interfaces?

So, i have two test servers in one vlan. srv1 eth1 10.10.10.11 eth2 10.20.10.11 srv2 eth1 10.10.10.12 eth2 10.20.10.12 Cluster VIP - 10.10.10.100 Corosync config with two interfaces: ...
1
vote
0answers
2k views

monitor of systemd resource with pacemaker & corosync returns “not running” when cloned while it is

The setup: - OS: CentOS 7, latest versions op Corosync, Pacemaker & PCS - two node active/active cluster with a virtual IP - on both nodes Exim is running for outoging mail (SMTP), nothing special ...
0
votes
2answers
1k views

IIS7.5 Virtual Directory Wrong Physical Path

I have been fighting this problem for hours, and I can't make IIS (7.5 on 2008r2) do the right thing. Every time I try to go to the photos virtual directory, I get a 404.0 and the physical path listed ...
1
vote
2answers
384 views

Using Azure Traffic Manager for an immediate increase in capacity

I have a REST web-service on Azure which has very high but variable load, it's all set-up to auto scale using Paraleap so that it can handle the peak periods but keep costs down when things are ...
0
votes
1answer
856 views

Hadoop: How to configure failover time for a datanode

I need to re-replicate blocks on my HDFS cluster in case of a datanode is failing. Actually, this appears to already happen after a period of maybe 10min. However, I want to decrease this time, but ...
4
votes
3answers
324 views

how to avoid timeouts during server reboot

I am running into issues with a site that is using DNS round robin for failover. There are two webservers. When I turn off apache on one box, everything is fine. When browsers try to go to the ...
-1
votes
2answers
121 views

Is going to work this failover scheme? [closed]

I have two replicated LAMP servers, one as slave and the other as master: Master: Name = master.kimsufi.com - IP = 5.5.5.1 Slave: Name = slave.kimsufi.com - IP = 5.5.5.2 (as you can see, both are ...
2
votes
0answers
596 views

DRBD + corosync + pacemaker - Servers won't connect after failover

I got 2 servers configured with drbd, corosync with pacemaker. It is all working fine, primary server gets secondary if it fails, and secondary gets primary. But if the 1st server comes up again ...
1
vote
0answers
169 views

Dell PowerConnect Link Aggregation Failover Failed

We are a small office with two Dell PowerConnect 5548 switches that, together, cover all of our servers and hosts. I had them connected using ports 47 and 48, which I placed in a LAG. Port 47 was ...
0
votes
1answer
489 views

How do I bond eth0 to failover to wlan0 after WAN connection loss?

I would like to have my monitoring box (Zenoss) notify me when the network upstream of me goes down without an actual link loss. I have had some issues with our CoLo's switches going down, but I don'...
0
votes
2answers
66 views

What is optimal sql server cluster storage solution?

I have been assigned a project where sql server is running on a single server with single raid 1 volume. This setup has worked fine until hardware failure resulted in about a day worth of downtime ...
5
votes
2answers
173 views

Windows 2012 R2 Hyper-V cluster without shared hardware

I have several servers with local SATA/SAS RAID arrays. I would like to run there virtual machines with some level of automated failover - sync VM to secondary node in 1 minute interval and automated ...
1
vote
1answer
3k views

Redis/Sentinel cluster failover results in “failover-abort-not-elected master”

I have a 2 node Redis cluster set-up. [master] 192.168.56.102: Redis Master (:6379), Redis Slave (:6380), Sentinel(:26379), Sentinel#2(:26380) [rescue] 192.168.56.103: Redis Master (:6379), Redis ...
1
vote
1answer
455 views

Openvpn failover setup - Routing to clients with static ips

I have a setup with an openvpn server and many clients connected to it. All those clients have fixed ip addresses, derived from their certificate name. Behind the openvpn server, I have a management ...
0
votes
2answers
2k views

Windows Server Failover Clustering with two servers

I was going to create a Windows Server Failover Cluster, in order to set up MS SQL Server AlwaysOn Availability Groups. As a prerequisite of failover clustering, I've created and configured an ...
1
vote
1answer
2k views

“Applications and Services” is missing from Failover Cluster Manager

Microsoft instructions advise to use "Services and Applications" but it's missing from the Failover Cluster Manager. For example, the documentation for Test the Failover of a Clustered Service or ...
1
vote
0answers
2k views

Windows Failover Cluster - Create Cluster Wizard: error occurred while creating the cluster

I have 2 identical Windows Server 2008 R2 servers which I am trying to setup a failover cluster on. The "Validate a Configuration" passes, but the actual creation process produces an error: An error ...
3
votes
2answers
794 views

Best CNAME TTL strategy for fallover switching

I've recently been thinking about the TTL of our DNS. We have A records for our servers and then CNAME records for the customer facing names. The www.example.com CNAME points to server-01.example.com ...
3
votes
1answer
283 views

IPTABLES for multiple Public IP Addresses

Currently i have two servers Running Debian 7 with HA Active/Passive setup using Pacemaker and Corosync as follows: node1->IP->xx.xx.xx.1 node2->IP->xx.xx.xx.2 VIP(Floating IP) ->xx.xx....
5
votes
1answer
239 views

vSphere/ESX How to log migration event to guest Windows OS

On a vSphere/ESX environment, how to write (automated) migration events to the eventlog into the hosted Windows VM that has been migrated? So that the hosted OS is aware of the migration event, and ...
1
vote
0answers
128 views

No messages received on Queue after Failover in SQL Always On

We have an Application, which uses Service Broker to receive notifications from the SQL Server. The application works fine when we don’t have SQL Always On enabled, and when we are interacting with a ...
0
votes
1answer
714 views

Ubuntu 2 Node Cluster Postgresql 9.3 with pacemaker and Streaming Replication

I'm trying to setup a 2 Node Cluster with Postresql 9.3 and Streaming Replication. Streaming Replication is successfully configured. Master is listen up and is sending to slave. I can do failover ...
0
votes
1answer
489 views

PowerDNS - Verify that a host is up before resolving

I have twp name servers running PowerDNS as ns1 and ns2 using a master/slave-type setup, and this works well. I want to create multiple servers to provide services (i.e. web, email, etc), then have ...
1
vote
1answer
395 views

Architecting nginx for redundacy

This may be a stupid question, but after googling a while I can't find the answer or just don't know how to ask it. I have a web app running on a server named 'myserver1'. I've brought up 'myserver2' ...
0
votes
1answer
77 views

How to achieve stateful fail over when using multiple uplinks?

I have multiple ISP lines over which I am load balancing the network traffic on my linux machine having multiple interfaces ( eth0, eth1 ,eth2, eth3) . This I am doing by creating the routing tables ...
0
votes
1answer
411 views

High CPU consumption of Apache in Win2008 R2 cluster

I Have 2 Win2008 servers running in a failover cluster, I have also installed Apache 2.2 and assigned it as a generic service for the cluster. The setup is designed to cater (at max) 76 clients. When ...
1
vote
0answers
328 views

IP Resource Errors While Building a Windows Failover Cluster on Azure

I have setup a failover cluster in Microsoft Azure on four VMs. I have two nodes in one subnet/region, one node in another subnet/region and a final node in a third subnet/region. The cluster passed ...
1
vote
0answers
169 views

Apache ReverseProxy sets upstream server to error when it returns an error page

We are using an Apache LoadBalancer/ReverseProxy to provide a failover for our web servers. Currently we are experiencing the following problem: A webservice call returns an error with HTTP status ...
0
votes
0answers
34 views

MSSQL High Availability Advice Required

I'm looking to implement a high availability SQL installation using MSSQL2012 or 2014 and there is 1 part of this I'm not sure about. I plan to have a SQL cluster at site a, and a secondary SQL ...
0
votes
1answer
18 views

Restart failed processes on available machine

I'm working on a system that has about 50 processes distributed across about 4 different machines. The architecture allows for any process to run on any machine, but only allows each process to run on ...
-1
votes
1answer
76 views

Rapid failover from one data center to another when the first goes down?

I'm building a global CDN and have a DNS service that will direct customers to the closest server. However I need rapid failover if one of the data centers e.g. Germany goes down users need to be ...
0
votes
1answer
34 views

Hot-spare using Pound

I currently have a server deployment in which Pound is being used as a reverse proxy (HTTPS -> HTTP) in front of a single server instance. I'd like to add a second instance on a different host that ...
0
votes
1answer
316 views

How can I create redundant EC2 instances when also using EBS?

I am searching for a host for a web application that must interact with a few terabytes worth of files. One solution I'm considering is to host the application on Amazon EC2 with multiple EBS ...
1
vote
1answer
513 views

PHP - Memcached - Libmemcached - Handle cache server outage

I am working on ensuring our app degrades gracefully in case of a complete cache outage, which is highly unlikely, as we have minimum of at least 3 cache nodes to add to the cache pool, by way of PHP'...
1
vote
0answers
230 views

ASA failover mode switching from Active/Active to Active/Standby

We have two ASAs with failover set to Active/Active. This seems to work fine for everything we do except using VPN connections. It seems whenever the primary ASA fails over that all VPN connections ...
1
vote
1answer
2k views

RTMP Proxy Server

I have an application which uses both HTTP (content data) and RTMP (video streams) for communications. An nginx server is configured for load balancing and proxying incoming client requests. It works ...
0
votes
2answers
635 views

Keepalived loses VIP upon power cycle of master

I have two servers running Keepalived 1.2.7 with hostnames left and right. Here are the configs: # keepalived.conf on left vrrp_instance VI_1 { state MASTER interface eth1 ...
0
votes
1answer
65 views

Apache loadbalancing - how to get reported about server fault

I am a newbie about load balancing so sorry if the question is trivial. I set up a basic load balancing using one server as a load balancer (planning to add at least one more with heartbeat) and for ...
0
votes
1answer
2k views

Mongodb replica failures to resolve DNS when primary DNS is stopped while secondary DNS is operational

I have setup mongod replica consisted of 3 nodes + 1 delayed hidden node + arbiter. I have setup DNS: primary and secondary internal DNS (bind) servers, so that I can reference nodes by normal FQDN ...
2
votes
1answer
178 views

What are the options for a HA system?

I'm looking into creating a HA Linux machine for my client's website. What are the main options I have, or a place/article where I can find out more? I would LOVE if it was a single-image, too, so ...
-2
votes
1answer
97 views

Is MOSIX the easiest way to build a redundant system?

I'm trying to figure out the easiest way to build a server with HA. I looked into Linux-HA, Heartbeat, Mesos. I then found MOSIX. I don't know if it's a thing from the past that no one uses, but ...
0
votes
1answer
511 views

Can HAProxy reconnect a websocket to another backend server transparently?

I'm new to HAProxy so this might have an obvious answer but I wasn't able to find it. Consider this setup: two backend web applications; one HAProxy in front of the web applications; many clients ...
1
vote
0answers
335 views

Keepalived configurations

I installed keepalived on two firewalls to provide fail over. I'm not sure if the following configurations are correct (see configurations below). Sometimes I have problems to reach the websites ...
0
votes
1answer
347 views

Hosting self hosted WebAPI in Windows Failover Cluster

I've got a windows service that is self-hosting the Asp.Net WebAPI. This works great and I can send GET requests successfully. However I am also trying to host this service in a Windows 2012 ...