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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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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4 views

Setting up a highly available Mail service with Postfix and ISCSI [migrated]

in an academic project these days we've got to set up a highly available Mail service with ISCSI and Postfix... For now i have a highly available ISCSI SAN and also a highly available Postfix server, ...
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23 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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7 views

How to configure database loadbalacer and fail over with master slave configuration

I have a web application written in java with Mysql database. I want to ensure high availability of my database server, hence i have configured master-slave replication mode. All my reads goes to ...
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1answer
48 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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5 views

migrate standalone postgresql database cluster to high availability cluster [migrated]

We have tested one setup of postgres HA with repmgr and pgpool. It is working fine and now we have to migrate our existing database to the HA setup. We have two approaches, Make the HA master as ...
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1answer
18 views

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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21 views

AlwaysOn Availability Group error after Windows Update in environment without a failover cluster [migrated]

Our SQL Server service was down this morning which brought down some of our websites. When I went to check the Windows Event Viewer I saw the following errors: Script level upgrade for database ...
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1answer
22 views

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
39 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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27 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
55 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 ...
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1answer
97 views

pacemaker config resource for nginx

i'm trying to build cluster by two vm using virtualbox i follow this tutorial http://www.tokiwinter.com/clustering-with-drbd-corosync-and-pacemaker/ and type the command as below [root@node1 data]# ...
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41 views

MariaDB Multimaster replication and AWS Auto Scaling Group

One of the things I hate most about RDBMS is that it can't sit on an ASG like the web servers and bounce it around and scale it up and down like a yoyo. Or can it? Recently looking at MariaDB galera ...
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22 views

Add security/authentication to mongodb (2.6) without downtime?

We have a 3 node replica set (running 2.6.1) that's running mostly defaults. We'd like to add authentication, but do it without downtime. I'm fine with restarting the nodes one-by-one and even ...
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1answer
28 views

Corosync 2.3.3: Unable to enable cipher

I'm trying to set up a new pacemaker/corosync stack of 2 machines. I was using it before with corosync1, but on Ubuntu 14.04 I've got corosync 2.3.3 OK - I said, and tried to use this version of ...
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2answers
68 views

Never miss a HTTP post [closed]

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 ...
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26 views

Running iSCSI LIO with high availability

I've build a two node storage setup with OCFS on top of DRBD to provide storage for a couple of ESXi servers. Will it be possible to setup iSCSI targets on both storage nodes and make one of the nodes ...
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2answers
173 views

Centos 6.5 configuring HA cluster

I need to configure HA cluster using 2 computers. But I've got a problem, when I'm trying to start a heartbeat service it starts but throws an error. Here's the error message: Starting ...
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1answer
77 views

High Availability/Failover hardware hookup

I'm learning about clustering and high availability techniques, and stumbled upon an article about configuring a network with a pair of servers, using DRBD for replication and heartbeat for monitoring ...
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2answers
217 views

corosync fails to install

I was trying to setup cluster using corosync and pacemaker on RHEL6 (CentOS release 6.5) I have added following repo data [haclustering] name=HA Clustering type=rpm-md ...
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2answers
420 views

Which STONITH hardware for power fencing?

I'd like to setup a two node high availability cluster using corosync/pacemaker/drbd. For that, of course, I need fencing. As far as I understand, all IPMI/iLO/... solutions do the job, but only as ...
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2answers
133 views

Static IP in AWS but with possible Load Balance feature

I am playing a bit with AWS. My goal is to setup infrastructure, which will have static IP on outgoing connections (requirement from payment provider which solution has been implemented in our app) ...
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1answer
209 views

Simple fencing/STONITH script in Centos 7

I am installing a simple Corosync/pacemaker/drbd high availability cluster using Centos 7 and would like to provide fencing/STONITH using custom hardware (power switches using USB connections). As ...
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26 views

HA router with keepalived showing unexpected traceroute

I have a couple of routers in HA using keepalived vrrp daemon under linux. Here are the addresses x.x.x.129 floating (keepalive) x.x.x.130 router1 (static) x.x.x.131 router2 (static) Something ...
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3answers
70 views

Load balancing for a running server process with sessions

I'm developing a server application that accepts incoming connections and works with client applications. The customer wants to have two machines working: in case one goes offline, the second will ...
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3answers
64 views

Web-based System High Availability [closed]

I'm a SysAdmin in one of the construction sites in a remote place. There is no reasonable internet speed can be reached there except a poor 3G/4G signal coverage which provide the users with ...
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36 views

Geo replication for a GlusterFS mirror

I'm assigned with a task to setup a HA setup and what I'm looking for is if it possible to have GlusterFS do the following: DC1: 2 glusterFS servers are set in replication DC2: 2 GlusterFS servers ...
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1answer
321 views

redhat cluster failover not working (corosync [TOTEM ] Retransmit List)

I'm using following: [root@kpdbm01 ~]# cat /etc/redhat-release Red Hat Enterprise Linux Server release 6.5 (Santiago) [root@kpdbm01 ~]# uname -a Linux kpdbm01 2.6.32-431.20.3.el6.x86_64 #1 SMP Fri ...
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1answer
51 views

Avoiding a Single Point of Failure with link aggregation

I have a requirement for a system with no Single Point of Failure. The client have offered two Ethernet cables per server. Each of the servers will connect into their network, however I want to ...
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2answers
138 views

Corosync :: Restarting some resources after Lan connectivity issue

I am currently looking into corosync to build a two-node cluster. So, I've got it working fine, and it does what I want to do, which is: Lost connectivity between the two nodes gives the first node ...
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93 views

RabbitMQ - How I do configure servers for zero-downtime upgrades?

Having read through the docs and RabbitMQ in Action, creating a RabbitMQ cluster seems straightforward enough, but upgrading or patching an existing RabbitMQ cluster seems to require the whole cluster ...
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1answer
181 views

iptable CLUSTERIP doesn't work

We have some requirements which explained here. We tried to satisfy them without any success as described. Here is the brief information: Here are requirements: High Availability Load Balancing ...
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1answer
270 views

Multimaster Keepalived Configuration (Virtual IP with Load Balancing)

Here are requirements: 1. High Availability 2. Load Balancing First configuration 1. Two linux servers have been configured with one static IP for each: 10.17.243.11, 10.17.243.12 2. Keepalived has ...
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1answer
126 views

HA - Heartbeat / Pacemaker - CentOS - Manual Symlinks

I have a MySQL Master <> Master pair setup for HA. I would like to setup automatic failover not just if the node hosting the current write mysql instance goes down, but also if the mysql instance ...
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2answers
89 views

Keepalived loses VIP upon power cycle of master

I have two servers running Keepalived 1.2.7 with hostnames left and right. Here are the configs: # keepalived.conf on left vrrp_instance VI_1 { state MASTER interface eth1 ...
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1answer
160 views

uwsgi + Django with nginx: High Availability Setup

Moved from : http://stackoverflow.com/questions/25304968/uwsgi-django-with-nginx-high-availability-setup to here. I was setting up High Availability on RHEL 6.5 . My Stack is 1. uwsgi 2. nginx ...
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211 views

Microsoft SQL Server Standard High Availability without Shared Storage

I'm a software dev with little experience managing SQL so please bear with me! We are developing a piece of software that needs to be highly available, with a significant degree of resilience. This ...
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1answer
180 views

How to lower Gluster FS down peer timeout / reduce down peer impact?

The setting: Two fresh CentOS 6.5 server with latest updates. Both have a fresh install of Gluster 3.5.2. What I did ( from the perspective of server 2, shared1 and shared2 are logical volumes ) : ...
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1answer
139 views

What are the options for a HA system?

I'm looking into creating a HA Linux machine for my client's website. What are the main options I have, or a place/article where I can find out more? I would LOVE if it was a single-image, too, so ...
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1answer
48 views

What FLOSS linux software should I use for high-availability on an FTP server on vmware? [closed]

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 ...
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42 views

Deploying High Availability Remote Desktops on Server 2008 R2 Ent - Do they have to be virtual desktops

I am looking at upgrading an existing 2008 R2 RDS Server to be part of a high availabilty environment. (It cannot be 2012 or 2012 R2 due to management not liking Windows 8 UI and associated training) ...
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1answer
621 views

VMware FT, App HA: What happens if vCenter Server is offline?

I am interested in the two features named "Fault Tolerance" and "App High Availability" which are part of some VMware products. As far as I understand the vCenter Server instance is needed to perform ...
2
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1answer
26 views

Website failover across internet connections

Requirement For a network having 4 static IP internet leased line connections linked to hosting a website. What are the current strategies one can apply to ensure high availability in case of ...
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1answer
46 views

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 ...
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119 views

Haproxy load balancing TPS lower than single node

I have 2 apache2 servers running in the back end and have a haproxy between them and the clients. If I bench tested anyone of these apache2 severs with ab i get north of a 1500TPS however when I bench ...
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1answer
240 views

Corosync dynamically add node

I have been experimenting with Pacemaker & Corosync for a HA setup. I installed it on two Ubuntu 14.04 Linode's and after a lot of back and forth on outdated config examples and tutorials, managed ...
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134 views

LVS + HA Proxy for L4 to L7 load balancing

Currently we are using HA proxy for our load balancing needs. We are planning to integrate LVS with HA proxy to create a load balancing solution that can take care of L4 to L7 load balancing and HA. ...
4
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3answers
138 views

Website high availability without load-balancer?

I'm considering options for changing a 'high availability' website that provides a service via an https api. The current setup is: Two self-contained VMs, from different cloud providers (AWS and ...
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1answer
175 views

IBM V7000 firmware upgrade effect on mounted LUN

We've IBM storwize V7000 Storage where the firmware is going to be upgraded to latest version.. This will require a reboot to the storage. I've got arround 10 LUN's (almost 10TB) coming from this ...