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Questions tagged [high-availability]

High availability is an architectural consideration often involving degrees of redundancy to insure availability in case of system or component failure.

High availability is an architectural consideration often involving degrees of redundancy to insure availability in case of system or component failure. Highly available systems are commonly implemented in situations where the risk outweighs the cost.

Best practices such as change control, standardized procedures, and monitoring can also enable high availability.

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HAProxy / Heartbeat - multiple floating IPs

I have successfully PoC'd the use of two HAProxy servers w/ heartbeat to load balance traffic between two squid servers with pass through Kerberos authentication in our shared services office. I've been exploring the idea of separating internal load…
Lazaro Ravelo
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Tool/formula for calculating overall availability of a cluster when adding/removing nodes

I'm trying to find common methods for calculating overall system availability when the app runs on a cluster and the app isn't fault tolerant. I.E. If any one node of the cluster is down, the app fails. When incrementing linearly from 1, I can…
SQLmojoe
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SQL Server Failover Clustering (4 nodes)

I think I was able to convince my cow-erkers that jamming all the databases on one server is a good idea. So, our setup will be something like this: Production - SQL 2014 Enterprise Standby - SQL 2014 (with automatic failover from Production) (I…
Rob
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One big server or multiple small?

I run an ad network with about 10 million visits per month. It is very likely that this rate will increase to 50 million in the next 6 months. What is the best way wo scale hardware? Currently I am using a Digitalocean droplet with 8 GB Ram and 4…
Max
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How does HA / failover work?

Let's say we have ten servers, each one has a copy of stateless application. user enters address in a browser / client program. dns server returns a list of ip (however many people say that dns should not be used to provide HA, especially for…
piotrek
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XenServer High Availability

I was wondering if anyone has ever tried to setup HA-like functionality without paying for the Essentials Package using XenServer. I love XenServer but would rather not fork over $2.5k per server for the Essentials Package. Also, is the HA that…
jemmille
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How can I deal with failures when connecting to a MySQL cluster?

Our company has created two MySQL servers that are kept in synch using a master-master strategy. The two-machine cluster is managed using crmsh. This is only a high-availability cluster, meaning that one MySQL server is being sent data at a time,…
Parham Doustdar
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Never miss a HTTP post

I have a webservice that have a couple of "machine" clients connected to it that does HTTP post with data once in a while. The nature of the service is that I cant allow the service to loose a single incomming request. However I do experience that…
DavKa
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What FLOSS linux software should I use for high-availability on an FTP server on vmware?

I don't mean this as an opinion-based question. I want to know if my assumption is correct to use a network-oriented tool (keepalived) as opposed to a cluster-oriented tool (heartbeat) in a scenario where I want to have several linux FTP servers…
MattBianco
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Setup Galera Cluster with two servers

Can I Create Gallera Cluster with two servers ?? Actually I have 6 servers: 2 Server for Load Balancer 2 Server for Apache Or anyone here can suggest me how to create High Availability Web Server with 6 servers? Thanks
yayantritaryana
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What software should I use for fault tolerence/high availability for 2 servers

What are some of the industry standard enterprise software to allow fail-over or swap-over between 2 servers? E.g., if 1 server goes down(due to connection or power, etc), the other kicks in either immediately, or after a certain time of like a few…
Null Reference
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domain redirecting/forwarding during server shutdown temporary

I rack my brain how could I solve the following issue: my website/server needs to be available all the time, so just few minutes downtime could be critical I would run a separate server (server number 2) in parallel in case of…
Denes
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Choosing a database management system to maximize availability and scalability

If I was planning on choosing a database management system and know that the data needs to be available as close to 100% as possible and that it needs to scale as well as possible, is there a "best" database management system for that at this time?…
O_O
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Is a virtual IP assigned by a hosting provider?

I'm going to be setting up HA proxy with 2 physical servers, using heartbeatd. I'm going to have clients point domains to an IP address which can't change after doing so. My hosting provider has provided me with 6 IP addresses. Will I need to use…
orokusaki
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Relying on shared disks for heartbeat

I read somewhere that using shared disks for heartbeats is reliable even if network totally fails. I read it in the context of remedy from split-brain. Is this correct? But I can not understand this. If network fails, doesn't this also affect shared…
user76678
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