In computing, failover is automatic switching to a redundant or standby computer server, system, or network upon the failure or abnormal termination of the previously active application, server, system, or network. Failover and switchover are essentially the same operation, except that failover is ...

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174 views

How to Reduce Failover Interval in HAProxy?

I have setup HAProxy and it is working fine. I observed that when one of the node goes down HAProxy detects that immediately, but switch-over / redirect existing traffic to the rest of working nodes ...
2
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0answers
140 views

DHCP Failover works but no DNS available

I have a DHCP failover (load balance) configured. DHCP failover works but the clients are not getting any DNS entries. We have 2 DNS servers using AD-integrated zones, and the failover is between ...
2
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0answers
735 views

Error getting the list of sites from the target environment: An invalid dn syntax has been specified

Trying to add another (second) Domain Controller to an existing Domain. In the second step of "Active Directory Domain Services Configuration Wizard" getting the following error: Error getting the ...
2
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0answers
571 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 ...
2
votes
0answers
554 views

Dreamhost DNS to AWS Route 53

I'm looking to setup DNS failover for config.webconverger.com and I think Route53 is the best option to get it going. However I'm confused how to export the DNS zone from Dreamhost to Route 53, ...
2
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0answers
49 views

Failover web hosting with multiple NS

Are there any drawbacks in having each nameserver entry in a domain name point to different failover server? In this setup, the same DNS server will also serve the content - so if it's down, the ...
2
votes
0answers
384 views

Keepalived failover not working for Static NAT target behind Cisco ASA

I've got a Cisco ASA[0] with a pair of Linux boxes in the DMZ running Keepalived and HAproxy acting as a load-balancing failover pair for another pair of Windows servers, also in the DMZ. I'm ...
2
votes
0answers
727 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
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0answers
739 views

Openldap Mirror Mode replication failover

We have currently one master ldap server and around 400 slave servers which are partially replicated through that master.All openldap versions are same and 2.4.31 What we want is actually if master ...
2
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0answers
147 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
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0answers
479 views

JBoss: switch domain in case of failure

In a cluster configuration of 2 different physical servers, managed with the domain setup, where one of the servers is the master and acts as a domain and the other is the slave and gets the ...
2
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0answers
353 views

ISC-DHCPD failover, Modifying host definitions via OMAPI

Background: I'm working on replacing my single DHCP server with 2 in a failover configuration. When I do a DHCP request I see the lease is created in both dhcpd.leases files on each server. However, I ...
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20 views

Performance concern with hosting large clustered DBs on VPS cloud servers

I wonder if anybody else bumped into this issue? You get a couple of beefy 12-core VPS instances in some cloud like DigitalOcean and set up a database on them in "active-passive" cluster ...
1
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0answers
34 views

Hyper-V - Upgrading a 3 node 2008R2 cluster to 2012R2

I'm just after a some advice/tips on upgrading our 3 node Hyper-V cluster from 2008R2 to 2012R2. I have 3 x Dell r710s running Server 2008R2DC. These are clustered and running about 15 VMs (5 on each ...
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vote
0answers
480 views

How to configure Failover IPs for High Availability with Hetzner Online

I have a cluster of 3 Ubuntu nodes running in VMs in the lab and want to take it now to production. Hetzner Online hetzner.de offers some good value dedicated servers, so I rented 3 machines, ...
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97 views

Simultaneous server crash in fail over cluster

I have 2 servers in a failover cluster. The cluster defines a shared 'ClusterStorage' drive. The drive maps to a SAN device through iScsi. Recently, the 2 servers rebooted on their own at the same ...
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vote
0answers
120 views

dhcp relay with failover to local service

I'd like to set up a dhcp server which normally relays to a central site, but has a pool of addresses to hand out if the link to the central site goes down. I'm using isc dhcp server on Debian, but ...
1
vote
0answers
63 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 ...
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2k views

monitor of systemd resource with pacemaker & corosync returns “not running” when cloned while it is

The setup: - OS: CentOS 7, latest versions op Corosync, Pacemaker & PCS - two node active/active cluster with a virtual IP - on both nodes Exim is running for outoging mail (SMTP), nothing special ...
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168 views

Dell PowerConnect Link Aggregation Failover Failed

We are a small office with two Dell PowerConnect 5548 switches that, together, cover all of our servers and hosts. I had them connected using ports 47 and 48, which I placed in a LAG. Port 47 was ...
1
vote
0answers
2k views

Windows Failover Cluster - Create Cluster Wizard: error occurred while creating the cluster

I have 2 identical Windows Server 2008 R2 servers which I am trying to setup a failover cluster on. The "Validate a Configuration" passes, but the actual creation process produces an error: An error ...
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vote
0answers
119 views

No messages received on Queue after Failover in SQL Always On

We have an Application, which uses Service Broker to receive notifications from the SQL Server. The application works fine when we don’t have SQL Always On enabled, and when we are interacting with a ...
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0answers
314 views

IP Resource Errors While Building a Windows Failover Cluster on Azure

I have setup a failover cluster in Microsoft Azure on four VMs. I have two nodes in one subnet/region, one node in another subnet/region and a final node in a third subnet/region. The cluster passed ...
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0answers
165 views

Apache ReverseProxy sets upstream server to error when it returns an error page

We are using an Apache LoadBalancer/ReverseProxy to provide a failover for our web servers. Currently we are experiencing the following problem: A webservice call returns an error with HTTP status ...
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228 views

ASA failover mode switching from Active/Active to Active/Standby

We have two ASAs with failover set to Active/Active. This seems to work fine for everything we do except using VPN connections. It seems whenever the primary ASA fails over that all VPN connections ...
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330 views

Keepalived configurations

I installed keepalived on two firewalls to provide fail over. I'm not sure if the following configurations are correct (see configurations below). Sometimes I have problems to reach the websites ...
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vote
0answers
884 views

XenServer IP Failover OVH not working

I have got problem on XenServer with IP FailOver in OVH. I did everything what is in this official tutorial http://help.ovh.co.uk/BridgeClient and IP not working. On my VM is Debian 7 64bit I set MAC ...
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0answers
1k 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: ...
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0answers
316 views

How to bind CIFS server to virtual IP in Windows Server 2012?

I'm a unix guy who is new to clustering with Windows. I have two Windows 2012 servers that have the StorNext clustered filesystem mounted as drives on each. If I try to add the File Sharing role, I ...
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vote
0answers
309 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 ...
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vote
0answers
328 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 ...
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0answers
166 views

keepalived - service not available on the 'passive' host

I've got ip failover configured on two hosts for a mysql (percona) cluster with keepalived; the failover works as expected, but I cannot access the service from the host that is passive or in 'backup'...
1
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0answers
504 views

Windows 2003 cluster: One node offline causes the cluster service on the other node to fail

I configured a 2 node cluster on 2 Windows 2003 machines with Exchange 2003 The resources: Majority node set Data volume Cluster IP Cluster network name Exchange 2003 system attendant (and all ...
1
vote
0answers
817 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
182 views

OpenVPN Failover Validation

I've never seen something like this: I'm using OpenVPN Access Server to validate failover between two servers. When I validate their SSH connecction I get this error: ERROR: CONNECT_SECONDARY: ...
1
vote
0answers
238 views

Basic solution for IP address failover on Windows

I'm trying to find a basic solution that will allow an IP address to fail over from one Win2k3 server to a standby one. I've got my own programs that can detect when a failure has occurred and trigger ...
1
vote
0answers
72 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 ...
1
vote
0answers
434 views

Setting up Cisco routers using WIC-1AM interface cards for backup/failover over dialup

I have two 1751 routers using a 56K connection. The routers work with out any issues. I want to add a WIC-1AM to each router as backup/failover. All I need to do for the routing should add a new ...
0
votes
0answers
21 views

Load balancing 2x IIS Webservers, across subnets

Morning chaps, Currently we've got one virtual webserver, and if it goes down, nobody can login or access our Intranet. To resolve this I've installed two test servers (2012 R2), one on our first ...
0
votes
0answers
6 views

In LVS with keepalived, should different virtual servers have different virtual routers?

I have LVS with Keepalived in a master/backup configuration, used as a load balancer for several virtual IPs. Currently the Keepalived configuration has a separate vrrp_instance for each VIP. Each ...
0
votes
0answers
19 views

Multiple IP failover on VPN PPTP

I have a server at SoYouStart, I ordered an IP failover. I want to setup a PPTP VPN so I could be able to have one connection to the "normal" IP and one to the failover IP I couldn't manage to do ...
0
votes
0answers
39 views

Load balance two ADSL connections Centos 7

I have centos 7 server working as a gateway for my network with three LAN cards and two internet connections from different ISPs , i want to combine the two connections and balance the network load ...
0
votes
0answers
15 views

How do I redirect connections to a local mailserver in fail case to a online mailserver (with dns?)

Situation: I administrate a small business network (10 employees) with a bad internet connection (satellite, limited traffic volume, weather-dependent), so some services like mailserver are organized ...
0
votes
0answers
49 views

Redis & HAProxy - updated configuration settings?

Have gotten 2 Redis instances installed, with one being a master. That is working remarkably well and with no headaches. I'm now trying to get my HAProxy/keepalived nodes to handle some sort of ...
0
votes
0answers
45 views

TCP Balancer active/standby active/passive

I have two Servers, Server A,ServerB. running as TCP socket server. I want to a active/standby or /active/passive failover. that means: 1:Server A and Server B Running, route ALL connection to ...
0
votes
0answers
8 views

Add Multiple FileShares to Windows Failover Cluster

Is there a way to add multiple fileshares simultaneously or via powershell to Windows Failover Cluster on a Windows 2012 R2 server? With the user interface, this will take all day because there ...
0
votes
0answers
27 views

Windows network teaming failover email notification

I'm wondering if it's possible to configure Windows Server network adapter teaming to send alert email to administrators in case of failover. Does this function exists builtin ? Or do we need any ...
0
votes
0answers
23 views

MySQL Cluster: Too Many Connections

We have our java application directly connected to the MySQL cluster (NDB engine) with 1 SQL Node. We also have another SQL node. We had a requirement to load balance our 2 SQL Nodes with the physical ...
0
votes
0answers
19 views

How to failover to another ovpn configuration?

The OpenVPN documentation gives information about failover/loadbalancing over several servers, within one configuration file. Is there a way to failover to another .ovpn configuration? I have the ...
0
votes
0answers
29 views

failover from Oracle VM to Azure

Can I do a failover from Oracle OVM to Azure and then fallback to Oracle VM i.e. to Oracle Hypervisor environment? Does Azure support this at this point of time?