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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3
votes
1answer
540 views

Redis sentinel + HAProxy failover

I am looking to implement a HA redis implementation using Master-Slave redis servers. The web servers will connect to these through an HAProxy instance installed on each box. The situation is easy ...
0
votes
1answer
202 views

Proper management of PGPool II

Currently I have a site, with one Postgres database server. It is just for a select number of users (less than ten) but it needs the maximum uptime possible. I would like some kind of automatic ...
-3
votes
2answers
134 views

What is the best way to setup a heartbeat agent for failover between two VMs? [closed]

I have two VMs in VirtualBox that use NAT for their network adapters. They are both getting the same IP address, so I will need to reconfigure that; but knowing that, is it possible to set up a ...
0
votes
1answer
91 views

Failover server virtualization, what solution? [closed]

I currently have a web/mail server with mutiple virtual domains on it. I would like to run a failover server (all my dns are already on an failover ip), keep it in sync with the main server. Thus ...
0
votes
1answer
63 views

Server DR configuration

I have 2 Dell PowerEdge Servers, a Dell T310 and a Dell T320 - both running Windows 2008 Server. My main application runs on the T320 (with Raid 1 on the data drive - configured using Dell utility), ...
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votes
2answers
97 views

Hardware failover of linux server without clusters or vm?

Any ideas on how to provide complete failover for a SLES11 installation without implementing clusters or vm? The applications that are running are not (and will never be) cluster aware. There are ...
0
votes
2answers
2k views

nginx reverse proxy - try upstream A, then B, then A again

I'm trying to set up nginx as a reverse proxy, with a large number of backend servers. I'd like to start up the backends on-demand (on the first request that comes in), so I have a control process ...
1
vote
2answers
122 views

Any software/proxy that can do SMTP failover?

I'm using a monitoring software that sends out email to my ISP's mail server (SMTP Server). But sometimes, the ISP's mail server goes down, or takes too long to respond, I would like to find out if ...
0
votes
0answers
82 views

Limit Devices on SonicWall FailOver Connection

We'd like to use a SonicWall to configure a failover Internet connection that will likely use a Verizon 4G "jetpack". We don't anticipate having to use this very often but when we do we are concerned ...
0
votes
2answers
37 views

DNS failover in virtual network

I have read some articles here and on other websites about the drawbacks of using DNS to implement high availability services. This is mostly due to the fact that configuring DNS to work efficiently ...
2
votes
3answers
104 views

ESXi 5x cluster Hardware Failure Scenario

Hello fellas engineers. I have a ESXi5.0 cluster setup with 3 ESXi hosts. Now I need to create a test case for networking hardware failure and preform the test in the datacenter. My Setup: 1) 3 ...
4
votes
1answer
146 views

DRBD for HA Server in Small Office Questions

Backround: We are in need of a HA server in a small office environment and are looking at DRBD to provide it. We only have about 100GB that needs to be on the HA server and server load will be ...
2
votes
1answer
256 views

DHCP failover with isc-dhcp-server using two secondary servers

I'm rearranging our network and putting some DHCP failover since we have a lot of machines, and even servers, getting IP addresses with DHCP. Today we have a nice DNS topology with one master server ...
1
vote
1answer
562 views

Sharing storage between DFS nodes providing failover without failover manager

I'm currently consulting for a small engineering firm that has been using a single server for all their domain needs and their management has got sick of not being able to access networked shares from ...
0
votes
0answers
108 views

mysql Failover using HA PRoxy and mysql-proxy

i am using ubuntu and succeeded to create 2 servers Master-Master using tungsten and its working perfectly, with this setup master1 192.168.1.10 master2 192.168.1.11 proxy 192.168.1.12 i want to add ...
0
votes
0answers
52 views

Best strategy for maintaining different config file versions for failover

I have two servers. They're both LAMP servers with one as the primary public facing machine and the other as the secondary. Right now I have a script on the secondary that monitors the primary. If ...
0
votes
1answer
64 views

Ip-failover and geolocalization

I have a server (from OVH) located in France with French ip. However most of the people coming to my website are from Poland. From what I read having a Polish ip address could lead to better search ...
2
votes
2answers
402 views

Azure Load balancing internal instances of web/worker roles?

As far as I know Azure does not have a load balancer for internal services, internal endpoints are not load balanced. But can someone have implemented a "soft" solution, or can advice me some helpful ...
0
votes
1answer
104 views

Setting up apache + mysql + exim on new servers. Redundancy/HA/Failover?

We are currently moving our single Linux server to a few other physical Linux servers, and would like to take the opportunity to have some more failover options. Backups are fine, and we don't ...
0
votes
0answers
50 views

heartbeat ip failover not working

I followed tutorial from this link. If I stop heartbeat service, the other node will take the virtual ip and bind http to that ip. But if I disconnect the network or turnoff power of currently active ...
-1
votes
1answer
46 views

Configure Jenkins for LDAP failover [closed]

I was wondering if anyone has successfully configured Jenkins with two LDAP servers so if one server fails, it will query the other server?
0
votes
1answer
161 views

How to make active/passive jboss resource in pacemaker

I want to configure my pacemaker for jboss server. I have 2 nodes with mysql master/slave configured. The problem is I want to start jboss on node which is located master database. The one possible ...
0
votes
1answer
171 views

Cisco ASA failover can't ping gateway

I'm currently trying to set up a failover network for my Cisco ASA 55x0 using the SLA traking. I have the "outside" interface (network 89.x.x.48/29) and the "outside2" interface (network ...
0
votes
1answer
195 views

RedHat 6 Cluster Failover

I'm testing the RedHat Cluster Administration tool documented here: https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Cluster_Administration/index.html I have two ...
0
votes
1answer
62 views

Detect if the original node failed in tomcat cluster

I have two nodes in a cluster. Node1 initially servers requests. Loadbalancer redirects the request to node 2 if the first node fails. I would like to know if there is a way for the Node 2 to detect ...
0
votes
1answer
106 views

Secondary fallback/failover network on Cisco ASA

In my network there is a Cisco ASA 55x0 with "inside" interface (network 192.168.79.0/24) and "outside" interface (network 89.x.x.48/29) There is this nat rule: object network NAToutside nat ...
1
vote
1answer
488 views

Configuring HAProxy with memcache with failover

I'm configuring a new set of servers for an existing Wordpress site, and it's been requested that memcache be available and made more resilient. The idea proposed is to have HAProxy send requests to ...
0
votes
0answers
237 views

Server 2012 cluster - SAN volume - failover not working

The following configuration is available: - 3 HP SAN disk Enclusores / 2 SAN controller; HSV200 (FC) - 2 HP Brocade SAN switches - 2 HP blade servers, each with a QLogic FC HBA QMH2462 - SAN volume is ...
2
votes
1answer
219 views

VPN Failover Cisco ASA 5505

So basically we have a Cisco ASA 5505 (we have inherited this from a customer, none of us have any experience with Cisco's). Now essentially we have to WAN lines which we have setup in Failover, via ...
2
votes
1answer
73 views

Performance penalty when using CNAME

We are using the current CNAME record for a server, i.e. foo.example.com => CNAME => server1.example.com server1.example.com => CNAME => ec2-34-142-138-31.compute-1.amazonaws.com ...
0
votes
1answer
257 views

AWS EC2 Mailserver Failover Strategies done right

I'm researching in this topic really hard the last few days and i just want to discuss this with a few specific questions - i did not find any suitable thread here that is covering my needs and ...
3
votes
2answers
55 views

Is it possible to have automatic failover of a windows service without windows clustering?

Due to a partial failure of our SAN we have switched our message queuing (Active MQ) from using network storage to using local storage. Because the secondary server is no longer sharing the same ...
2
votes
0answers
178 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 ...
0
votes
2answers
221 views

Infiniband, SRP and failover

I am considering an linux-based infiniband storage setup, but I am tripping over whether or not I can do active/passive or active/active failover with DRBD and SRP targets. I am led to believe that ...
0
votes
0answers
34 views

How can I set up the most manual sort of failover possible?

I do not want my servers to automatically fail over, even if it means an hour of downtime. I have synchronous replication in my DB, and I have 4 servers (2 app and 2 database). How can I use virtual ...
1
vote
1answer
157 views

Bond0 Failover when link light stays up: High Availability Network

Configuration: Two switches, each with a separate internet route Centos servers with eth0 and eth1 bonded as an active-backup on bond0, eth0 in on switch and eth1 in the other /etc/modprobe.conf ...
-1
votes
2answers
128 views

Single Static Public IP FAILOVER to Other PUBLIC IP Address

We have a customer that has a windows server located behind a dual wan router that has two static IP addresses from each ISP. They have staff out in the field that have laptops with applications that ...
0
votes
1answer
132 views

Memcached distribution

I have a question about memcached distribution across nodes. We have 20 memcached nodes with 200GB memcached on each. Our apps are PHP apps. $memcache->setOption(Memcached::OPT_DISTRIBUTION, ...
0
votes
1answer
190 views

Setting up a failover web server, off site

I've read so many articles, posted a few SF, but I can't find a solution that seems to cover everything. It doesn't seem as black and white as setting up and AD and installing DFS to replicate ...
0
votes
1answer
218 views

How can I solve the “split brain” issue with only 2 physical servers?

I have 2 physical servers, each will contain 2 VMs; a VM with Postgres (9.2) running, and a VM running some Python software (which will connect to the Postgres server). I'm not tied to anything in ...
1
vote
0answers
120 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 ...
-1
votes
1answer
28 views

How to set up always on server that directs between two URLs?

I have two urls: myurl.co.za myurl.net And a 3rd url: myurl.com Depending on different times of the day, I want users to be redirected to either myurl.co.za or myurl.net. I have a program that I ...
1
vote
2answers
241 views

Server 2012: how to plan for storage failover?

The Stuff I have the following components to work with: two rooms two beefy Dell R510s, one in each room two EMC VNXe storage devices, one in each room. The goal Ensure that if one server room ...
2
votes
1answer
96 views

SQL Server 2008 R2 Failover Clusters behaviour on multiple failures

I'm testing the resilience of one of our test systems. We have 2 x DB (SQL 2008 R2 on Server 2008 R2, running in ESXi VMs) arranged in a Failover Cluster. Shutting down the Active SQL Server service ...
2
votes
0answers
62 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.
0
votes
1answer
121 views

What's the best way to run HAProxy backup as another HAProxy server and avoid cyclical issues

I have several geographical regions for my service deployment, say Region1, Region2, and Region3. Each region has a failover haproxy instance. Each haproxy is configured with several backend servers ...
3
votes
3answers
1k views

A-Record Failover?

I have a Fortigate 100D with 2x BT Business Infinity Fibre connections acting as WAN1 & WAN2. The BT lines come with 5 static public IPs each and I have my DNS hosted through CloudFlare pointing ...
0
votes
1answer
107 views

Is there a linux remote fs driver (nfs/sshfs/cifs/etc) that also keeps a local copy and fails over to the local copy?

I need to keep some static web mirrors synced in as close to realtime as possible, but I also want it to be somewhat fail-safe (or at least not obvious to the visitors), so if the file server goes ...
0
votes
2answers
142 views

MongoDB Failover Time

I have a MongoDB 2.4 replica set of six nodes and an arbitrator running in a test environment. I was testing the fail-over response time and it was around forty-five seconds. Keep in mind, reads are ...
1
vote
1answer
249 views

Xen XCP: Route failover IP to Guest

I have two hosts, which I installed XCP 1.6 on. The machines are hosted at Hetzner. Each host currently has a public IP and an additional IP assigned. There is a guest on each of the hosts which ...