High availability is an architectural consideration often involving degrees of redundancy to insure availability in case of system or component failure.
-3
votes
1answer
16 views
Azure extra small vm availability set [closed]
My current extra small vm reaches the limits, so I decided to create a second extra small instance and add the two into a availability set so my service is everytime available and through the load ...
0
votes
0answers
13 views
DRBD mount randomly unmounts itself
We have setup setup an NFS HA "cluster" using drbd/heartbeat. Everything works as expected when tested... If the instance nfs1 goes down, nfs2 picks up and everything seems to be fine. On both ...
0
votes
0answers
15 views
red hat cluster doesn't migrate on node shutdown [duplicate]
i have 3 node cluster using conga interface . qdisk is working fine.service running is httpd. now when i shutdown a node on which service is running currently it gets fenced and rebooted but my ...
-2
votes
0answers
37 views
Conga cluster node-fencing problems [closed]
I have a three-node cluster created using Conga. Shutting down one node on which services are running gets fenced, but the services don't migrate to another node.
Here's our cluster.conf ...
1
vote
1answer
60 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 ...
0
votes
0answers
37 views
configure heartbeat HA on Amazon VPC instance
I'm trying to implement HA with Heartbeat (and monit) on two Amazon VPC instances.
I read many articles about it and I tried all possible options I can think of.
few articles I read (don't work for ...
0
votes
0answers
35 views
cassandra compaction high load
Since last night I am seeing CPU load spikes on our cassandra boxes(Occasionally load goes up to 20, its a Amazon EC2 c1.xlarge with 300 iops EBS). After digging around a little I believe its related ...
0
votes
1answer
35 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, ...
2
votes
0answers
59 views
LVM DRBD Shared between nodes proxmox
Context :
I have proxmox cluster with the volume group shared with drbd for the VM - KVM.
I have a problem with drbd. Indeed, when a node disconnect, the associate link between the differents nodes ...
1
vote
1answer
62 views
Per-packet round-robin load balancing for UDP
I need to load-balance UDP traffic between a number of "realservers" and do it in a truly round-robin fashion. I've started with keepalived, but unexpectedly discovered, that LVS treats UDP traffic as ...
0
votes
0answers
30 views
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
...
0
votes
1answer
32 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", ...
1
vote
1answer
61 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 ...
0
votes
0answers
10 views
Pacemaker configuration with different dependencies
I have two-node HA environment with services that I want to be partially independent.
There is active/active sip service with two floating IPs.
There is also two active/active groups with java ...
1
vote
0answers
23 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.
0
votes
0answers
27 views
DRBD + OCFS2 high load when copying. Troubleshooting?
I have a dual primary DRBD + OCFS2 setup for web serving and generally it works very nicely.
I can however get the load to spike to 40 - 50+ by say extracting a large tar file or rsyncing several ...
0
votes
0answers
22 views
Can a Pacemaker cluster change VM memory allocation based on RAM availability on each node?
I'd like to build a two or three node Pacemaker cluster that would manage Xen (or possibly KVM) virtual machines.
Is it possible to set up the Pacemaker cluster (or some of its components) in such a ...
1
vote
1answer
44 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 ...
0
votes
1answer
78 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
# ...
0
votes
1answer
39 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 ...
-1
votes
2answers
281 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 ...
0
votes
0answers
36 views
Load Testing Result Parameters
An enterprise application consisting of php, perl and a database is load tested. Php is running on httpd as a module, and database is on MySQL. Os is RHEL 5.5 and the load is simulated using Jmeter.
...
0
votes
1answer
123 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 ...
3
votes
3answers
311 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 ...
0
votes
0answers
33 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 ...
0
votes
0answers
33 views
Deploying Concrete5 in a Stateless environment
We are looking at deploying Concrete5 in a stateless environment (multiple application servers). They will have a shared DB cluster (possibly Google Cloud SQL) and multiple small app servers. I'm ...
0
votes
1answer
86 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 ...
1
vote
1answer
168 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 ...
0
votes
0answers
47 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?
...
1
vote
1answer
38 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 ...
1
vote
0answers
244 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 ...
0
votes
1answer
114 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 ...
3
votes
1answer
109 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 ...
2
votes
1answer
131 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 ...
0
votes
1answer
96 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 ...
0
votes
0answers
72 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
votes
1answer
129 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 ...
1
vote
1answer
93 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 ...
3
votes
6answers
247 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 ...
-3
votes
1answer
52 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 ...
0
votes
1answer
97 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 ...
0
votes
1answer
75 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 ...
0
votes
1answer
78 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
votes
1answer
243 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
votes
1answer
186 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 ...
0
votes
1answer
192 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
votes
1answer
364 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
votes
1answer
664 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 ...
4
votes
2answers
451 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 ...
3
votes
3answers
249 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 ...
