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

learn more… | top users | synonyms (1)

5
votes
0answers
491 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 ...
4
votes
0answers
320 views

Using ZFS head node as database server?

I'm using a dual-head ZFS-backed NAS for high availability cluster shared storage, based on Nexenta's recommended architecture as seen here: The disks in 1 JBOD will store the database files for a ...
3
votes
0answers
143 views

Pacemaker ocf:heartbeat:IPaddr on different subnets

I'm trying to add a Pacemaker virtual IP address; with it, the gateway, and the two VMs it serves on different subnets. I've only done this before with all IPs on the same subnet, and I need some ...
3
votes
0answers
69 views

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 ...
3
votes
0answers
68 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
votes
0answers
97 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 ...
2
votes
0answers
159 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 ...
2
votes
0answers
100 views

Multiple httpd with JBoss cluster: provide httpd HA

I have a working configuration like this: +-----+ +-----+ +-----+ +-----+ | i1 | | i2 | | i3 | ... | in | JBoss Cluster +--+--+ +--+--+ +--+--+ +--+--+ | ...
2
votes
0answers
468 views

TeamCity (or Jenkins) with Cluster/Replicated servers

We use Team City 7 for Continuous Intergration. Sometimes I need to bring down the server for maintenance which stirs up complaints. Is anyone using a cluster for these types of servers where there ...
2
votes
0answers
2k 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 ...
2
votes
0answers
124 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.
2
votes
0answers
120 views

Fence node in apache traffic server

I'm currently looking into Apache Traffic Server as a tool for providing better availability of web services. But looking at the manual I can't see any reference to how I can pro-actively fence a ...
2
votes
0answers
660 views

Windows 2008R2 RemoteAPP Failover

I'm trying to setup 2 remoteapp servers with a bit of fail-over in the design. I keep running into a few dead ends where there is no load balancing... or connections take a ridiculous amount of time ...
1
vote
0answers
18 views

Loadbalancing and HA with SolrCloud?

I have a LAMP Application running with solr 3.x on one server for several years now. Now I am migrating due to heavy load to a setup with two dedicated machines where all services are loadbalanced via ...
1
vote
0answers
93 views

SLES 12 High Availability Cluster - scsi persistant reservation fencing

I'm trialling SLES 12 w/ HAE to run a Fileserver cluster consisting of two nodes. Idea was to use SCSI persistant reservation as a fencing method using the fence_scsi script from stonith fence agents. ...
1
vote
0answers
225 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 ...
1
vote
0answers
34 views

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 ...
1
vote
0answers
158 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 ...
1
vote
0answers
44 views

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 ...
1
vote
0answers
88 views

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 ...
1
vote
0answers
131 views

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 ...
1
vote
0answers
360 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 ...
1
vote
0answers
60 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 ...
1
vote
0answers
79 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) ...
1
vote
0answers
209 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 ...
1
vote
0answers
177 views

Redundant Debian Gateway

I have to configure a redundant gateway with Debian boxes and I would like to get some recommendation what's the best solution in my case. There are certain limitations in my setup and I have to go ...
1
vote
0answers
297 views

Most efficient way to setup massive high-availability storage in Azure to work with multiple VMs?

I'm looking into various options for setting up massive high-availability storage in Windows Azure, to use together with my Azure VMs. The VMs need to be able to work with the storage as if were a ...
1
vote
0answers
135 views

Getting the DB2 Resource online in Failover Cluster

I'm using DB2 10.1 Enterprise Server Edition on Windows Server 2012 R2 After adding the DB2 resource to the cluster using the db2wolfi command, I go to the resources tab which is in the cluster ...
1
vote
0answers
718 views

keepalived - random re-elections

We have set up 3 servers running keepalived . We started noticing some random re-elections occurring which we can't explain so I cam here looking for advice. Here is our configuration: MASTER: ...
1
vote
0answers
87 views

HP Blade based georedundant configuration / IRF

I'm planning to deploy 2 georedundant server farms. We chose HP Blade system. Every site would consist of: 1 x C3000 enclosure 4 x BL460c servers equiped additionally with 554M mezzanine (to have 4 ...
1
vote
0answers
540 views

How to configure cluster.conf for failover routing two networks?

I'm routing between an "external" subnet with Internet connectivity and two "internal" subnets, using iptables forwarding on a Linux box running CentOS 6.4: I'd like to now duplicate this router ...
1
vote
0answers
228 views

High-availability for ZMQ traffic

We have a lot of incoming third-party ZMQ traffic (zmq.PULL on our side). We need to implement a high-availability solution for that traffic. At the very least, we need to be able to manually switch ...
1
vote
0answers
45 views

Prevent NGINX from rerouting to a backend that was previously down

I'm using NGINX's ip_hash directive to ensure that client requests always end up at the same backend server. In the case of a backend server outage, NGINX will reroute to the available server, and ...
1
vote
0answers
253 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 ...
1
vote
0answers
279 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 ...
1
vote
0answers
1k views

Nginx Active/Active Cluster Setup

I am currently attempting to configure a pair of load balancing servers in an Active/Active configuration using the following: Nginx Corosync Pacemaker Applicable instructions were followed ...
1
vote
0answers
250 views

High availability setup with 2 tomcat servers in Windows

I am trying to set up a high availability setup(not load balancing, only HA) with 2 tomcat servers. When I google for information, I get tons of links with apache+HAProxy+keepalived setup for linux ...
1
vote
0answers
91 views

Service fails to start when failover kicks in

I created a Windows Service which hosts a WCF application looking at/binding to the Clustered MSMQ The Windows service was first installed on both nodes of the cluster. I then created a cluster of ...
1
vote
0answers
489 views

Memcached and repcached not replicating 2 master servers

I have memcached-1.2.8-repcached-2.2 installed on memcached on centos. They install went great and when i start memcached i get: replication: connect (peer=192.168.1.2:11212) replication: marugoto ...
1
vote
0answers
364 views

repcached broken sync - memcached high avalaibility

I have been using repcached (memcached-1.2.8-repcached-2.2)to store php sessions in order to have a highly available memcached. Everything runs perfect, I can restart a daemon without losing sessions. ...
1
vote
0answers
660 views

Kerberos high availability failover, Apache Mod_auth_kerb, Using the Kerberos slave is slow

We host our own Redmine rails web application internally with Apache using Mod_auth_kerb and our internal Kerberos for authentication. We have 2 internal Kerberos servers KDC1 and KDC2. KDC1 is ...
1
vote
0answers
288 views

Exchange 2010 High Avaibility Solution planning architecture

I'm planning to deploy Exchange 2010 in organization. This organization consists of 2 sites. The plan for 1st location (holding most of the employees) is: - 2 x Windows Server 2008 R2 Enterprise - ...
1
vote
0answers
70 views

IP migration by filtering

I'm looking for a solution to use virtual IPs between 2 hosts, but in a specific way. I would like to have the addresses bound to both hosts at once, but filtered out on the inactive one (arp ...
0
votes
0answers
3 views

Icinga2 dependecies of devices on HA

I would like to configure a Host-to-Host dependency on Icinga2, however, one of the Hosts has an HA configuration, so I need the to trigger it only when both HA devices are down. Suppose this ...
0
votes
0answers
53 views

DNS round-robin requests not distributed evenly

We have setup two DNS A records, where each points to a load balancer. nslookup ourdomain.com Server: 8.8.8.8 Address: 8.8.8.8#53 Non-authoritative answer: Name: ourdomain.com Address: ...
0
votes
0answers
19 views

Multi Path VRRP with keepalived

I'm migrating from an old heartbeat setup to using keepalived at the moment and currently I can't find how to replicate the heartbeat capability of using multiple links as cluster interconnects in ...
0
votes
0answers
29 views

can AWS load balancer auto restart out of service images?

I have set up a load balancer with two instances in two availability zone I set up an health check to ping a specific page of my webapp now I'm trying to find if the load balancer health check could ...
0
votes
0answers
38 views

Considerations for SQL Server 2012 when performing in-place OS upgrade to 2012 R2

I'm running SQL Server 2012 Enterprise (11.0.3381.0) on Server 2012 (6.2.9200) and am preparing for an in-place OS upgrade to 2012 R2. We've got an Always-On Availability Group in a 2-server cluster ...
0
votes
0answers
33 views

SQL 2012 AlwaysOn Availability Groups Failover Successfully But Application Complains About Login Failed for User

I am trying to get SQL 2012 AlwaysOn Availability Groups working for an application. The cluster has 2 SQL nodes and 1 witness server. Everything appears to be failing over successfully when I do ...
0
votes
0answers
23 views

mysql-ha in cloud failover

we have mysql linux 5.6 databases in AWS EC2 and we like to implement a multi region HA solution so we have no downtime and can fail over, what steps tool strategy you suggest?