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Questions tagged [failover]

The automatic switching to a redundant or standby computer server, system, hardware component or network upon the failure or abnormal termination of the previously active application, server, system, hardware component, or network.

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Setting up a backup DB server in ASP.NET web.config file

I currently have an asp.net website hosted on two web servers that sit behind a Cisco load balancer. The two web servers reference a single MSSQL database server. Since this database server is a single point of failure, I'm adding an additional…
nbb007
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Advise/Code samples on how to make an application "Cluster Aware"

I've browsed the web for resources regarding how to make an application/web application "Cluster Aware" using the Failover Cluster API. I found a lot of technical articles but none written from the programmer perspective. Does someone have any good…
Ausgar
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Can rollback still occur on a MongoDB replica set with J=1 and W=Majority?

I have been reading the docs and from my understanding I could see a scenario whereby a rollback could still occur: Write goes to primary which confirms that the journal has been written to disk Majority of the secondaries confirm the write but do…
Max
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How to depoly akka in distributed system, to achieve High Availability?

I am a newbie in Akka. But I have been working in web project for several years. Previously, We user "ngix+ tomcat cluster" plan, once one of the tomcat server crash(physically machine crash), the other members of the tomcat cluster would take over…
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Postgresql 9.2 failover

I have set up streaming replication from a master DB to a slave DB. If the master is shut down, the slave will take over. The replication and failover works fine. I have a web app using the master database for storing data. Some details: Both…
Zaute
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What are your opinions of DRBD/Heartbeat for replication and failover for the Firebird RDBMS?

I am researching the possibility of using Firebird for a project. However, one potential problem is replication and failover, or rather, lack of a (subjective) "good" solution. There are several potential solutions listed in the Firebird FAQ but…
z8000
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When AWS-based application fails, how to set a Fail Whale style page?

I have not been able to find an option for AWS ELB to show a fail whale-style system message when servers are failing to reassure customers that we are working on the problem. The best we can come up with is to set a micro-ec2 instance and then…
william tell
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How to handle MySQL slave failover in python?

Is there a generally accepted way to handle MySQL slave db failover in python code? Are there any good wrappers for SQLAlchemy connection pools (or other approaches) that are aware of replicas and can switch to them automatically? Is there a…
Rob Crowell
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Twisted: ReconnectingClientFactory connection to different servers

I have a twisted ReconnectingClientFactory and i can successfully connect to given ip and port couple with this factory. And it works well. reactor.connectTCP(ip, port, myHandsomeReconnectingClientFactory) In this situation, when the server is…
ayyayyekokojambo
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How does enterprise failover, such as with google.com, actually work?

We have a few fedora systems that are configured for web, FTP, and email services. We'd like to mirror these services, so that we can provide near 100% reliability for our users. I'm a fairly experienced Linux administrator, but don't have much…
Alex Regan
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How to failover Azure ACS if a data center goes down

We are looking for a way to provide failover for ACS instances, so if one data-center goes offline, authentication via ACS automatically fails over into another data center. Background: We use ACS to transform SAML tokens that are provided by a…
Ryan Gross
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OpenID in a load-balanced situation

I'm looking at implementing an OpenID provider ('OP') using Java + Tomcat/JBoss. Now one of the key things about OpenID is that The user communicates with both the OP and the RP and has a session with both sites. The OP and RP communicate with each…
Niels Basjes
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HAProxy - Maintain session stickiness after failover

I'm having a situation where I've to maintain session stickiness in case of a node's failure. The configuration is: three nodes (as1, as2, as3) running our enterprise application on JBoss 4.2.3 (homogeneous cluster) HAProxy doing roundrobin (one…
dgyimesi
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Patterns and technologies for a system capable of processing 40,000 messages per second

We need to build a system capable of processing 40,000 messages per second. No messages can be lost in case of any software or hardware failures. Each message size is about 2-4Kb. Processing of a message consists of validating the message, doing…
Konstantin Spirin
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Multiple Implementation Attempts

I am developing a solution which will connect to a wide variety of servers to read data and perform operations. There are many variables which complicate reliable communications such as firewalls, stopped/failed services, authentication…
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