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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JBoss EAP 6.2 high availability without HTTP server

i'm looking for some solution to make a Jboss Cluster ( 2 nodes ) in H.A. ( 1 live, 1 backup) but i don't want to use a third element ( machine, service or whatever ). Most configuration I found uses ...
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3answers
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What is the definition of High Availability? [on hold]

As far as my understanding goes the availability of a service or system is defined as: (Time resource was available - Time resource was unavailable) / Total Time My questions are: Is describing ...
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1answer
49 views

Zabbix web interface says Zabbix server is offline when failing over to passive node

Two Zabbix 2.4 servers using CentOS 6.6 with an external MySQL DB, both servers are configured to connect to this DB when they are running. I followed a combination of Zabbit High Availability guide ...
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1answer
36 views

Single Nginx Load Balancer for 2 different clusters (web, api)

I was wondering if it was possible to use a single Nginx server to load balance my web servers and api servers if both are using port 80. In this setup there would be 5 servers, 1 Nginx and 4 Apache ...
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1answer
19 views

POST of large file is timing out, when running through ARR

When POST'ing a large file through ARR, the request times out after 120 seconds. The client recieves error code 502 Bad Gateway. I have configured the "proxy timeout" of the web farm to be 600 ...
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Load balance and contingency server

everyone. I'm having trouble setting up a load balancing/contingency server. My scenario: I have 2 servers (Windows 2012 R2 machines) to run an application in ASP.Net/C#. My problem: Would I like to ...
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3answers
98 views

Replicating a linux web server

I'm planning on replicating a web server for high availability purposes. The server is running as a Ubuntu 15.04 virtual machine in Hyper-V and has MariaDB 10.0, Apache 2.4 and PHP-FPM 5.6 installed. ...
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46 views

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 ...
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SQL Mirroring with Certificates and Domain?

We're replacing all our servers and wish to migrate a mirrored database running in one domain to the new servers in a different domain without downtime. Is it possible to turn off mirroring in the ...
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35 views

Solving an asymetric HA Firewall/router

I have an old Linux HA firewall/router setup that never quite worked. As it was never quite put into true production (just testing and demo's), I always had to have one firewall shutdown to make it ...
2
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1answer
163 views

Why Failover instead of Load Balancing for HA

From my understanding with failover clustering, only one machine is actually working, which means the other one(s) are sitting idle. So why would one use failover clustering instead of using a load ...
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1answer
48 views

Creating High Availability Netflow Collector

I'm currently working on replacing our existing Netflow collector that is EOL with a new one. The goal is to support around 4 million flows/minute and have HA capabilities. Below is my initial ...
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1answer
22 views

How to setup user accounts on a secondary server in High Availability?

Working with two Microsoft SQL 2012 servers in Always On High Availability configuration running on Windows Server 2012 R2. Setup works well and failover is almost flawless. However, the software ...
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16 views

Ucarp on vlans in trunk - debian

is it possible to use ucarp on vlan interface in debian ? I am trying : auto eth1 iface eth1 inet static address 192.168.0.1 netmask 255.255.192.0 auto eth1.10 iface eth1.10 inet static ...
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2answers
54 views

Restarting failed hosts on VMware vSphere ESXi

When a cluster is configured for High Availability (HA), VMs can be restarted onto an alternate host when the its host has failed. However, I am wondering: if the host has failed, is there a means ...
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32 views

RHEL KVM HA rgmanager

I have a RHEL HA 2 node cluster which is run with rgmanager, cman (corosync), clvmd, gfs2 and storage replication using drbd I let drbd, clvmd and gfs2 be managed by rgmanager, but i have 8 ...
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68 views

CentOS 7 Cluster with load balancer

I'm trying to understand how clustering works in CentOS 7. I'm not a cluster expert!!! What I'm trying to do is to have three clustered services: httpd, mariadb (mysql) and postgresql. I've managed ...
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88 views

corosync is not in sync

Could you please help out show me how to form a cluster? corosync & pacemaker are used. two nodes rac0 ip 192.168.0.140 & rac1 ip 192.168.0.142 They are not shown in each other. They are ...
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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 ...
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1answer
61 views

Convert existing servers to a failover cluster

We have ourselves quite a quandary right now. For some time, we've been planning on setting up a failover cluster for our existing servers. The plan so far has been to set up a 2-node GlusterFS ...
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1answer
142 views

Keepalived + Haproxy performance, apache or nginx? [duplicate]

I have a question about Keepalived + Haproxy. At work I am assigned to deploy a redundant web server with Keepalived and Haproxy. Our setup at the moment is as follows: Apache (as load balancer) + ...
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55 views

How to let Corosync / pcs control nginx?

Folks, I'm trying to replace a single aging load balancer with multiple virtual machines running nginx. However after I got centos 7 and nginx installed I realized that heartbeat has been ...
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60 views

Is it possible to prevent pcs/dlm/crm from fencing the node when it fails?

Is it possible to prevent pcs/dlm/crm from fencing the node when it fails? I use cluster only to be able to build GFS2 storage, and there's my own way of avoiding split-brain. So I do not need things ...
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1answer
102 views

VMware High Availability questions

I can't seem to find the answers to these questions within the vSphere 5 Documentation center, so please share if you are aware of any aspects of these questions. What happens to the failed VM that ...
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Apache mod_jk LB synchronization server startup + application startup time

after a long search I can´t found a solution or path to solve my problem with synchronization startup of Apache and Backend servers. I have a Apache2 using a LoadBalancer with mod_jk that balance ...
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1answer
23 views

vmWare HA Admission Control configuration

In an HA cluster of 5 hosts (100GB memory) if Admission control is enabled and %age cluster failover option is set at 25 % (lets consider only for memory ie. 125 GB), and if one host fails then the ...
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1answer
80 views

Active/Passive Reverse Proxy with nginx

I have two Websocket servers which working with Zookeeper & Curator as Active/Passive, if one server fails then second backend comes alive. I configured it the following way: upstream backend { ...
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35 views

Strange haproxy behaviour

So I'm trying to set up a dual site haproxy (1.5.10) on Ubuntu 14.04. http://i.stack.imgur.com/EtdYo.png When I do service heartbeat restart on eartha, both machines go green briefly; then earthb ...
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33 views

Multiple Subversion Servers behind a load balancer

I'd like to add a little redundancy to my subversion setup. I'd like to have multiple servers share a common NFS mount and load balance http requests to the servers (with stickiness). Is this an ...
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2answers
69 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 ...
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1answer
74 views

Building the infrastructure to support a web application

I am building infrastructure to support a web application. I think I have a decent idea of what the infrastructure should look like, here's what I have: 2 x 16GB, 4-Core HAProxy servers for load ...
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62 views

Heatbeat is not assigning a virtual ip

I am trying to setup HA Cluster with Heartbeat on CentOS here is my configurations. $ cat /etc/ha.d/authkeys auth 2 2 sha1 test-ha $ cat /etc/ha.d/ha.cf logfile /var/log/ha-log ...
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Failover pacemaker cluster, packet loss monitor

It's issue is continued from this. 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 ...
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Configuring Proxmox Cluster Storage

We are configuring proxmox on our servers at two locations each location has; 1 x hp c7000 enclosures with 16 blades 1 x hp proliant dl585 We also plan to add a 24TB SAN to each location. We are ...
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1answer
251 views

Optimal configuration with Synology as HA iSCSI backend for vSphere

I'm looking into purchasing a new storage backend for our VMware vSphere Essentials package. We have 3 ESXi hosts, currently mainly using DAS. The goal is to upgrade to Essentials Plus this year, to ...
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1answer
65 views

ipt_CLUSTERIP: unknown protocol 1

I am trying to create a web cluster with two load balancers and a single public ip address The command I use is the following: iptables -I INPUT -d $CLUSTERIP -i $WAN_IF -j CLUSTERIP --new ...
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244 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 ...
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1answer
107 views

keepalived multiple instances

I have two application servers running keepalived that are both using keepalived on the same network. I keep seeing Jan 8 11:49:01 <server> Keepalived_vrrp[13764]: bogus VRRP packet received on ...
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114 views

Clustering with Jboss EAP and Load balancing with Haproxy

I'm doing load balancing with HAProxy and use JBoss EAP as application servers. The Haproxy server is configured to route incoming requests to the application servers. How can I integrate Jboss EAP ...
0
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1answer
122 views

Simple file share failover

I have a simple file share on Windows 2012 R2 server which I would like to be high available. I created failover cluster, but I'm not able to set up FileServer service as there is no shared storage. ...
0
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1answer
137 views

How to AVOID getting caught in a DDOS meant for someone else (not prevent)?

So we have a load balancer and all that jazz set up with Rackspace. However, guess what, our clients' websites were down again today. It seems that Rackspace should have their load-balancer ...
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0answers
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Is it at all commonplace to make service available via the same host as its redundancy, just different ports? [closed]

I am writing software that allows for the configuration of parameters for authentication with a Primary and Secondary RADIUS server. Server administrators, in your experience, is it common or not for ...
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1answer
80 views

How to reconnect to the backend with HAProxy

I'm new in working with HAProxy. I couldn't figure out how to make HAProxy to reconnect to backend that was down and started up back again. I have a configuration of two backend servers. When they ...
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1answer
138 views

Monitoring pacemaker with url trigger external agent

I have a HA setup, which now the only resource configured is Heartbeat with Active/Passive Configuration. Both running Debian 7, 64-bit in the cloud. Now i want to trigger an URL with the information ...
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1answer
144 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) ...
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1answer
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How to integrate the fence_cisco_ucs.py(python) script with the pacemaker-1.1.10 and corosync-2.3.3

I have CentOS 7 on the Oracle VM VirtualBox. I have installed the pacemaker-1.1.10, corosync-2.3.3 and pcs tools. I able to create normalocf::heartbeat:IPaddr2 and ocf::heartbeat:apache etc resources. ...
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1answer
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S3 dropouts in one region only - is this normal?

I'm using S3 to serve static image assets to a website. I'm a developer in Montréal, Quebec. My client's office is in LA. Once every month or three we're seeing S3 completely fail to serve images to ...
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1answer
90 views

vSphere High Availability, Fault Tolerance and Snapshots

I've heard claims from a vSphere server administrator that VMs configured for high availability continue to transparently function even in the event of an ESXi host failure. He also claims VMs ...
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157 views

Server 2012R2 DFS High Availability - with local storage?

Can I use clustering for high availability on two identical 2012R2 boxes that use LOCAL storage (not attached or SAN)? Local storage is super cheap and scalable, which is why the SAN has been ...
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2answers
179 views

the pacemaker can't start the drbd resource

here is crm the configure show [root@node1 /]# crm configure show node node1 node node1.mycluster.org node node2 node node2.mycluster.org primitive Apache apache \ params ...