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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16 views

options timeout doesn't work when Primary DNS server in resolv.conf fails

I currently have 2 load balanced AWS Linux box(s) which communicate to several windows web servers.These Linux servers act as a forwarder, re-direct rules etc onto these windows boxes and acts as a ...
-1
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3answers
53 views

How does HA / failover work?

Let's say we have ten servers, each one has a copy of stateless application. user enters address in a browser / client program. dns server returns a list of ip (however many people say that dns ...
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2answers
34 views

Transparent switch from Wifi to ethernet

I have the following network setup: Zyxel USG 200 Firewall which also acts as DHCP server 2 Switches 2 Wifi APs (Zyxel NWA3560-N and WAC6503D-S) with NAT and DHCP disabled The clients (mostly ...
0
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0answers
30 views

Heartbeat fails to start

I have two virtual machines running CentOS 6.6 (I use WMware workstation). I have heartbeat installed and configured on both. The configurations are: /etc/ha.d/ha.cf udpport 694 debugfile ...
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0answers
19 views

Proxmox Virtualized Client (Network Configuration)

first some information about me. I ordered a server from ovh and purchased one failover ip to test proxmox and do some training. The main Server is hosting proxmox(Example IP: 123.45.67.89 to figure ...
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0answers
31 views

Internal Failover Load Balancing in Azure

I have a MongoDB Cluster deployed in Azure. Normally a MongoDB cluster has at least a couple of mongo router instances (mongos) which is where an application should connect (the application is also ...
0
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1answer
52 views

Bind9: Master->Slave Notify IPv6 with fallback to IPv4

I've a small Master->Slave DNS scheme setup between two machines running Debian 8 + Bind9 in dual IP stack. The master and the slave both own an IPv4 and IPv6 used by bind, enfored by the ...
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0answers
40 views
+50

How to set up ARR in active/passive (aka failover) mode?

The Problem I am trying to configure several web farms (for different sites) following the NLB+ARR architecture. Let's say I have 6 VMs: ARR+NLB cluster of 2 VMs. It receives traffic and forwards ...
2
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0answers
77 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 ...
0
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1answer
130 views

Redis high availability and load balancing

I'm using Redis for some time and now we want to move to a redundant cluster which would be fault tolerant, highly available and load balanced. I principally use Redis for some PHP web application ...
2
votes
0answers
53 views

using apache2 mod_proxy(_balancer) for 3+3 tomcat failover configuration

we have got 3 active Tomcat instances, the load should be distributed evenly amongst them (sticky sessions via jvmroute, ajp). We also have got 3 failover Tomcat instances running. If one of the 3 ...
0
votes
2answers
63 views

How to enable “persistent mode” in Windows failover cluster manager 2012?

In Windows Server 2008 R2 there was a checkbox named "Enable persistent mode" on a General tab in the Properties of a cluster resource. In Windows Server 2012 that seems to have disappeared. My ...
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2answers
190 views

How to configure NIC teaming on free VMWare ESXi 5.5?

There are articles online that describe this process for paid version of ESXi via VDS. My understanding is that VDS is not available on free ESXi version. We, however, do not need fully blown HA on ...
0
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0answers
66 views

vSphere Cluster no failover

I've inherited a 2-node vSphere Cluster (vCenter appliance in the cluster). We recently had one host crash during working hours. My understanding with a vSphere HA Cluster (and like any cluster) when ...
0
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1answer
60 views

Replacing 1GBe with 10GBe NIC Failover Cluster Host

We have a 3-node Failover Cluster - all currently running 4 Port 1GBe NIC Cards. We intend to upgrade these NICs to 2x 10GBe + 2x 1GBe NIC cards which have the following configuration: Ports 1 -- ...
1
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0answers
43 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
25 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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0answers
36 views

OS X server Open Directory fail over successfully but not the user home directories

We setup the OS X server Open Directory(OD) master and replica. Users are created on master and their home directories are on the master server. When the master OD server is down, the OD client (MAC) ...
2
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0answers
205 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 ...
0
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2answers
81 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 ...
0
votes
1answer
326 views

Softlayer HAProxy with failover

I have 2 virtual servers on Softlayer, both running HAProxy. I am trying to set up failover with keepalived. Each server has a private IP and public IP, and they are on the same VLAN. I've tried many ...
0
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2answers
298 views

Failover pacemaker cluster with two network interfaces?

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 Corosync config with two interfaces: ...
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0answers
491 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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1answer
380 views

IIS7.5 Virtual Directory Wrong Physical Path

I have been fighting this problem for hours, and I can't make IIS (7.5 on 2008r2) do the right thing. Every time I try to go to the photos virtual directory, I get a 404.0 and the physical path listed ...
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0answers
71 views

BroadCom 5720 Multi-Switch Connection failing to achieve full bandwidth

We have following Setup: 2 redundant Dell 2848 Switches, identically configured and connected via 8-Port LAG on Ports 41-48. 2 identically setup Dell R730 with BroadCom 5720. Operating System is ...
1
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2answers
124 views

Using Azure Traffic Manager for an immediate increase in capacity

I have a REST web-service on Azure which has very high but variable load, it's all set-up to auto scale using Paraleap so that it can handle the peak periods but keep costs down when things are ...
0
votes
1answer
260 views

Hadoop: How to configure failover time for a datanode

I need to re-replicate blocks on my HDFS cluster in case of a datanode is failing. Actually, this appears to already happen after a period of maybe 10min. However, I want to decrease this time, but ...
4
votes
3answers
310 views

how to avoid timeouts during server reboot

I am running into issues with a site that is using DNS round robin for failover. There are two webservers. When I turn off apache on one box, everything is fine. When browsers try to go to the ...
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votes
2answers
89 views

Is going to work this failover scheme? [closed]

I have two replicated LAMP servers, one as slave and the other as master: Master: Name = master.kimsufi.com - IP = 5.5.5.1 Slave: Name = slave.kimsufi.com - IP = 5.5.5.2 (as you can see, both are ...
1
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0answers
286 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
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0answers
74 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 ...
0
votes
1answer
156 views

How do I bond eth0 to failover to wlan0 after WAN connection loss?

I would like to have my monitoring box (Zenoss) notify me when the network upstream of me goes down without an actual link loss. I have had some issues with our CoLo's switches going down, but I ...
0
votes
2answers
58 views

What is optimal sql server cluster storage solution?

I have been assigned a project where sql server is running on a single server with single raid 1 volume. This setup has worked fine until hardware failure resulted in about a day worth of downtime ...
1
vote
0answers
89 views

Windows 2012 R2 Hyper-V cluster without shared hardware

I have several servers with local SATA/SAS RAID arrays. I would like to run there virtual machines with some level of automated failover - sync VM to secondary node in 1 minute interval and automated ...
1
vote
1answer
852 views

Redis/Sentinel cluster failover results in “failover-abort-not-elected master”

I have a 2 node Redis cluster set-up. [master] 192.168.56.102: Redis Master (:6379), Redis Slave (:6380), Sentinel(:26379), Sentinel#2(:26380) [rescue] 192.168.56.103: Redis Master (:6379), Redis ...
1
vote
1answer
244 views

Openvpn failover setup - Routing to clients with static ips

I have a setup with an openvpn server and many clients connected to it. All those clients have fixed ip addresses, derived from their certificate name. Behind the openvpn server, I have a management ...
0
votes
2answers
852 views

Windows Server Failover Clustering with two servers

I was going to create a Windows Server Failover Cluster, in order to set up MS SQL Server AlwaysOn Availability Groups. As a prerequisite of failover clustering, I've created and configured an ...
1
vote
1answer
339 views

“Applications and Services” is missing from Failover Cluster Manager

Microsoft instructions advise to use "Services and Applications" but it's missing from the Failover Cluster Manager. For example, the documentation for Test the Failover of a Clustered Service or ...
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0answers
681 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 ...
3
votes
2answers
282 views

Best CNAME TTL strategy for fallover switching

I've recently been thinking about the TTL of our DNS. We have A records for our servers and then CNAME records for the customer facing names. The www.example.com CNAME points to server-01.example.com ...
3
votes
1answer
166 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) ...
3
votes
1answer
72 views

vSphere/ESX How to log migration event to guest Windows OS

On a vSphere/ESX environment, how to write (automated) migration events to the eventlog into the hosted Windows VM that has been migrated? So that the hosted OS is aware of the migration event, and ...
0
votes
0answers
53 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 ...
0
votes
1answer
252 views

Ubuntu 2 Node Cluster Postgresql 9.3 with pacemaker and Streaming Replication

I'm trying to setup a 2 Node Cluster with Postresql 9.3 and Streaming Replication. Streaming Replication is successfully configured. Master is listen up and is sending to slave. I can do failover ...
0
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1answer
196 views

PowerDNS - Verify that a host is up before resolving

I have twp name servers running PowerDNS as ns1 and ns2 using a master/slave-type setup, and this works well. I want to create multiple servers to provide services (i.e. web, email, etc), then have ...
0
votes
0answers
349 views

Failover Cluster Windows Server 2012 R2

I have 3 Physical Servers. Server 1 is the domain controller (Dell PowerEdge 1950) Server 2 is node 1 (Dell PowerEdge 2950) Server 3 is node 2 (Dell PowerEdge 2950) On Server 1, I have used the ...
0
votes
1answer
116 views

Architecting nginx for redundacy

This may be a stupid question, but after googling a while I can't find the answer or just don't know how to ask it. I have a web app running on a server named 'myserver1'. I've brought up 'myserver2' ...
0
votes
1answer
52 views

How to achieve stateful fail over when using multiple uplinks?

I have multiple ISP lines over which I am load balancing the network traffic on my linux machine having multiple interfaces ( eth0, eth1 ,eth2, eth3) . This I am doing by creating the routing tables ...
0
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0answers
27 views

Fail over in Lokiwall Firewall

I have configured lokiwall firewall on my linux machine having multiple interfaces. Dual Routing works fine. However, I wanted to know how does the fail over happen in case a link goes down. Do the ...
0
votes
1answer
131 views

High CPU consumption of Apache in Win2008 R2 cluster

I Have 2 Win2008 servers running in a failover cluster, I have also installed Apache 2.2 and assigned it as a generic service for the cluster. The setup is designed to cater (at max) 76 clients. When ...