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

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Strange Keepalived VRRP email notification

I have a 3 nodes keepalived (K1 to K3) installed and receiving email notification. The setup of keepalived is K1 VI_50, priority 100 VI_51, priority 98 VI_52, priority 99 K2 VI_50, priority 99 ...
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1answer
97 views

IP-based load balancing on external and internal interface

I have a certain distributed (as in, multiple components on multiple machines) service, that should be made available from the outside world. So, in LVS terminology, the clients are "on the internet", ...
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1answer
91 views

What design considerations should go into a proper Bitcoin exchange (or any other automated online trading system)? [closed]

Following the epic fiascos of the two main Bitcoin exchange sites (Mt.Gox, which went offline due to sheer traffic load during the worst market crash in the history of Bitcoins, leaving people with ...
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0answers
96 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
219 views

SSL Session Persistence - HA Heartbeat

I have two servers, let's call them Milo and Otis. Now Milo and Otis are setup to be an active-passive pair of highly available servers where Milo is usually the master and Otis stands-by waiting for ...
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1answer
579 views

Howto setup 3-node heartbeat cluster?

I want to set up a virtual IP on three nodes using heartbeat. Currently, I have this: ha.cf: # Facility to use for syslog()/logger (alternative to log/debugfile) logfacility local0 # ...
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1answer
86 views

How to connect to mysql-master-ha from my application server

I am trying to use mysql-master-ha. I managed to get it connected with the master and slave mysql servers. Now I would like to know how to connect to mysql-master-ha from my web application server ...
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3answers
2k views

corosync + pacemaker + nginx

I have been trying to configure and implement corosync + pacemaker + nginx to my vbox to create a High-Availability set-up between web servers. But can't find an exact tutorial on how to make it work ...
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1answer
518 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 ...
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3answers
423 views

How can I create a “fail whale” for my website?

I have a website that we load-balance across a few machines. The load-balancer (a Brocade ServerIron ADX) is on the local network. I know it has the capability to configure a "backup" ip address to ...
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1answer
119 views

Red-Hat Cluster doesnt migrate services on node shutdown

I have a RHCS with two nodes and manual fencing. when I restart Node 1 (the primary) it migrates both services to Node 2 automatically. but when I shutdown Node 1, it doesnt happen and I need to use ...
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1answer
254 views

MySQL High Availability with VMWare/DRBD/Heartbeat still common practice?

Is it still common practice to use a DRBD/Heartbeat solution for a high available MySQL Instance when the whole environment is virtualized (in our Case VMWare) Are there other/better solutions out ...
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1answer
722 views

Load balancing with High Availability - SQL Server + IIS using AWS

This is my first time load-balancing with high-availability using Windows and SQL Server. Looking for some validation and input on my planned setup. Now, typically when I want to create a HA ...
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0answers
72 views

Solaris and Hot-Standby

i have a short question. is it possible to create a hot-standby-cluster with 2 nodes and solaris 10? in Linux i would use DRBD and Hearbeat/corosync, but in Solaris? maybe do you have an tutorial? ...
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1answer
50 views

Backing up a mirrored SQL environment

I have 2 SQL servers in Mirror configuration. I want to backup these servers but backing up the SQL databases in Mirror state causes an error. These two mirrors also have a witness set. I would ...
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0answers
586 views

Exchange 2010 DAG Failover Cluster DNS Issues

I am having an issues with my Exchange 2010 servers. I have two servers that have HUB/CAS/MAILBOX installed on them. They are configured to use DAG failover cluster. I expereienced an issue recently ...
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1answer
459 views

Setup HA postgres database, failover concept

I want to setup a HA postgres database. I setup master and slave database with synchronous streaming replication on different physical servers. When there is an error in the replication, the slave db ...
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1answer
270 views

Virtual IP Failover when machine is overloaded

We have been using keepalived in combination with a virtual IP address for two years now. In the rare case that a machine crashes this works very well. But when there are issues on the box itself we ...
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1answer
992 views

Does HP IRF work the way I think it does?

I finally have approval to better centralize our Ethernet. When last I left off I was looking to the future to figure out how best to handle expansion. Now, I have answers. I now have a pair of A5820 ...
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1answer
2k views

Keepalived's virtual_router_id - should it be unique per node?

I have two nodes running keepalived, and two VIP, e.g. Node 1 Node 2 VIP1 VIP2 So in each node, I have two definition of vrrp_instance, so I assume the two vrrp_instance in my ...
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0answers
203 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 ...
5
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1answer
624 views

VMware vSphere DRS affinity rules for more than 2 guests

I've received a request to add disaffinity/anti-affinity rules on a set of virtual machines in a VMware HA/DRS cluster running VMware vSphere 4.1. The client has four hosts and wants to keep certain ...
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1answer
288 views

Advantage of Microsoft Cluster over Microsoft Network Load Balancer

Till recently, I assumed that Microsoft NLB worked at an OS/Machine level rather than an Application Level. i.e. the NLB just monitors heartbeats on the machine to check if machine is alive and then ...
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6answers
303 views

Should HA hardware be in separate cabinets?

I want to host (co-located) a service at a Pier1, Q9 or some similar hosting facility. Is it best practice to put my failover hardware in separate cabinets, and in your experience, will the hosting ...
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1answer
72 views

Highavailability/Global Loadbalancing of clusters [closed]

I know this website 1channel.ch which has like 4 servers in 4 different datacenters across the globe (czech republic, estonia, sweden, germany). What happens is as i am browsing this website the ...
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1answer
167 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 ...
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1answer
181 views

HA Options for Windows Servers

We are looking at different options to allow us to stay up and running when our primary datacenter (DC1) goes down for any reason. What is the main difference in having a offsite server updated all ...
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1answer
235 views

How to setup a failover solution for Windows 2003 SMTP Server?

I'm currently running Windows SMTP Server on a rented Windows 2003 Server VM. There are times when my hosting company network is down and my clients can't send their emails via the SMTP Server host I ...
2
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1answer
614 views

Microsoft fail over cluster and storage with raid card

I am looking for some input on a Microsoft fail over cluster implementation on 2012. To use the storage and pools it apparently has to have JBODS if your using a raid card. But the LSI card we use ...
2
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1answer
442 views

Linux HA Heartbeat Virtual IP Switching with domain name linked to it

I have heartbeat set up on two servers like so: Master: 10.15.1.50 Backup: 10.15.1.51 (Virtual IP: 10.15.1.52) So, the master always has 10.15.1.52 as well, but if it goes down, the backup will ...
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1answer
256 views

Can HAProxy load balance a remote site, while the server it runs on hosts another?

Bit of an odd question, and I know it's not ideal, but still..... I currently have a virtual machine that acts as a web server using Apache. This hosts a couple of different sites, with that being ...
2
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1answer
2k views

Where are Nagios Availability-Report files stored?

How to access Nagios Availability-Report files to retrieve "UP Time Percent" and so other information about Hosts and Services? I know It can be accessed through Nagios CGI but I want to use it on a ...
5
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1answer
3k views

mount.ocfs2: Transport endpoint is not connected while mounting…?

I have replaced a dead node that was running in dual-primary mode with OCFS2. All the steps work: /proc/drbd version: 8.3.13 (api:88/proto:86-96) GIT-hash: 83ca112086600faacab2f157bc5a9324f7bd7f77 ...
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2answers
3k views

How to do client side NFS failover in Linux?

I have a CentOS 6.3 client that needs to access NFS storage. There are two NFS servers that serve up the same content stored on a SAN with a clustered filesystem. How do I set up CentOS to failover ...
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3answers
1k views

What is the correct way to remediate an HA Cluster?

Background / Goal I have a VMWare HA cluster for production Machines with two hosts. It is currently set up so that it can account for the failure of up to one host. It does not use DRS. I need to ...
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0answers
229 views

How to setup Wordpress High Availability

I have installed Galera Cluster on 3 cluster + 1 management. I wanted to make it like this, Server1: Home (www.domain.com) Server2: For BBpress/Forum (Forum Tab Menu will forward to ...
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4answers
1k views

VMware Virtual vCenter and High Availability

To continue with this question: Should be Vmware vCenter server high available? According to the response there even if vCenter is down HA will continue to work. So, if my vCenter is a VM, using ...
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1answer
87 views

Choosing a database management system to maximize availability and scalability [closed]

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" ...
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1answer
422 views

could heartbeat v3 monitor service/resource status without pacemaker?

I am trying to setup a HA system based on CentOS, I want to use heartbeat v3 for the "heartbeat" mechanism, resource start/stop, looks heartbeat can get it done. But about the resource status, ...
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3answers
604 views

Does it work to run mysql with the data directory on a CephFS mount?

We have a database cluster that uses MySQL on DRBD with Pacemaker+Corosync, which is great. My question is whether it is possible (and whether anyone has been successful) to mount a CephFS drive to ...
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1answer
246 views

HAProxy MySQL Failover is not starting

I am trying to setup HAProxy with MySQL failover with Ubuntu. I used a setup similar to this serverfault question, however I am getting the following error when starting haproxy: [ALERT] 341/220001 ...
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1answer
95 views

lvsd config correct?

I have used Piranha to setup fail-over for httpd. I set the servers the same, but one shows the VIPS and the other doesn't. Is this normal? Server A) [Primary] [root@titania ~]# ipvsadm -L IP ...
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1answer
251 views

How to improve availability on a starting up PHP+MySQL application?

Yesterday, Rackspace DFW data center went down for a few hours and made me think on taking the delayed action of improving my server structure there. So far, I've been using a single CentOS instance ...
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2answers
67 views

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 ...
0
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1answer
74 views

How to manage SOAP requests to a pool of VM each listening on a HTTP port with a priority value in these requests?

I have a front SOAP web-server under Linux. It will have to communicate with Windows Servers VM listening each on a HTTP port, for a HTTP POST request. The chosen VM should return a report of a task ...
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1answer
103 views

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. ...
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2answers
445 views

How to configure HA iSCSI for Solaris 10

BACKGROUND: We have a StarWind NAS that we are currently using for High Availability storage with our Windows network. Starwind has mirrored drives and multiple ip paths, that the Windows Server ...
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2answers
80 views

Suggestions on providing HA access to an external (fibre) RAID subsystem

We are looking at upgrading our storage capacity with an external RAID subsystem that has redundant (2) fibre controllers, each controller has 4 x 8 Gbps fibre ports. I would like to make access to ...
2
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0answers
353 views

Highly-available, Web-accessible and scalable deployment of statsd and graphite

I'd like to setup statsd/graphite so that I can log JS apps running on HTML devices (ie. not in a contained LAN environment, and possibly with a large volume of incoming data that I don't directly ...
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1answer
660 views

What's the difference between keepalived and corosync, others?

I'm building a failover firewall for a server cluster and started looking at the various options. I'm more familiar with carp on freebsd, but need to use linux for this project. Searching google has ...