1
vote
1answer
30 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 ...
-2
votes
0answers
36 views

Fencing Cisco UCS for HA

Hi i have Cisco UCS C200 M2 on which i installed Centos and kvm. When trying to add this for fencing it shows You have to enter plug number Please use '-h' for usage I don't understand what this ...
-2
votes
1answer
71 views

Shared storage solution for Debian Wheezy [closed]

I need to setup a new infrastructure which provides high available shared storage between debian servers. Our current solution is a "clustered DRBD NFS solution". We have setup 2 virtual file ...
1
vote
0answers
42 views

How can I run a CentOS (Red Hat) cluster in degraded mode?

I've installed Red Hat's cluster software on an install of CentOS 6.5, and use it to provide redundant routing from one network to another. This works fine, and I have a pair of boxes providing the ...
-2
votes
3answers
86 views

Options for high-availability of a smallish website? [closed]

I'm running a website that gets ~1500 visitors a day. It's not a ton, but I want to make sure this site stays up nevertheless. Currently, we're hosted on a shared hosting provider and the site has ...
2
votes
1answer
197 views

NFS failover fails with stale file handles while migrating resources

Running into a bit of a problem here , I set up two servers ( Centos 6 ) with Glusterfs and a shared directory between them, I have moved the nfs directory to the shared Gluster folder and have ...
4
votes
2answers
315 views

How to scale up a web server supporting long polling

I am planing to add more web application servers to support increasing clients, deploying HAproxy and Keepalived for load balancing and High availability. My server usage has the following ...
0
votes
0answers
40 views

How do I choose a failover strategy for Mysql 5.5?

I have 2 mysql 5.5 database servers that I've just set up on Ubuntu 12.04. What I would like to do is provide a means of having these failover. Ideally using an HA strategy like keepalived so that ...
2
votes
1answer
100 views

Fault-tolerant network access to redundant storage in a heterogeneous environment (including Windows)?

We are facing a design "challenge" where we are required to set up a storage solution with the following properties: What we need HA a scalable storage backend offline/disconnected operation on ...
0
votes
0answers
50 views

Number of public ips for wackamole

I am trying to configure a highly available cluster consisting of three boxes with public ips. How many public IP addresses will I require for this? Can I configure spread on a private NIC and manage ...
0
votes
1answer
39 views

Make keepalived send 0 priority when going to FAULT state

When stopping (service keepalived stop), keepalived does send the priority 0 adverts so the backup server takes over almost immediately. However, when it goes to fault mode (check script returns not ...
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
1answer
180 views

corosync binding to 127.0.0.1 instead of correct interface

I have the following problem when trying to implement a two-node failover cluster, using Hetzner as the hosting provider. my corosync.conf is as follows: # Please read the corosync.conf.5 manual ...
0
votes
1answer
164 views

corosync and multiple load balancers

I am trying to provide HA capabilities for our load balancers (nginx, pgpool and haproxy optionally) using pacemaker/corosync. I have defined three primitives: 1 for the failover IP, 1 for ...
0
votes
0answers
120 views

configure heartbeat HA on Amazon VPC instance

I'm trying to implement HA with Heartbeat (and monit) on two Amazon VPC instances. I read many articles about it and I tried all possible options I can think of. few articles I read (don't work for ...
0
votes
0answers
159 views

Strange Keepalived VRRP email notification

I have a 3 nodes keepalived (K1 to K3) installed and receiving email notification. The setup of keepalived is K1 VI_50, priority 100 VI_51, priority 98 VI_52, priority 99 K2 VI_50, priority 99 ...
0
votes
1answer
87 views

Red-Hat Cluster doesnt migrate services on node shutdown

I have a RHCS with two nodes and manual fencing. when I restart Node 1 (the primary) it migrates both services to Node 2 automatically. but when I shutdown Node 1, it doesnt happen and I need to use ...
0
votes
1answer
310 views

Setup HA postgres database, failover concept

I want to setup a HA postgres database. I setup master and slave database with synchronous streaming replication on different physical servers. When there is an error in the replication, the slave db ...
2
votes
1answer
344 views

Linux HA Heartbeat Virtual IP Switching with domain name linked to it

I have heartbeat set up on two servers like so: Master: 10.15.1.50 Backup: 10.15.1.51 (Virtual IP: 10.15.1.52) So, the master always has 10.15.1.52 as well, but if it goes down, the backup will ...
5
votes
1answer
2k views

mount.ocfs2: Transport endpoint is not connected while mounting…?

I have replaced a dead node that was running in dual-primary mode with OCFS2. All the steps work: /proc/drbd version: 8.3.13 (api:88/proto:86-96) GIT-hash: 83ca112086600faacab2f157bc5a9324f7bd7f77 ...
6
votes
2answers
2k views

How to do client side NFS failover in Linux?

I have a CentOS 6.3 client that needs to access NFS storage. There are two NFS servers that serve up the same content stored on a SAN with a clustered filesystem. How do I set up CentOS to failover ...
1
vote
1answer
173 views

How to improve availability on a starting up PHP+MySQL application?

Yesterday, Rackspace DFW data center went down for a few hours and made me think on taking the delayed action of improving my server structure there. So far, I've been using a single CentOS instance ...
-1
votes
1answer
101 views

Relying on shared disks for heartbeat

I read somewhere that using shared disks for heartbeats is reliable even if network totally fails. I read it in the context of remedy from split-brain. Is this correct? But I can not understand this. ...
0
votes
0answers
183 views

Do I really need to give conntrackd a dedicated link?

Conntrackd claims to need a dedicated link for some reason. My setup is basically: 2x1GBe channel bonded into bond0 on each failover firewall. Seeing as conntrackd claims to need a dedicated link ...
2
votes
2answers
75 views

Suggestions on providing HA access to an external (fibre) RAID subsystem

We are looking at upgrading our storage capacity with an external RAID subsystem that has redundant (2) fibre controllers, each controller has 4 x 8 Gbps fibre ports. I would like to make access to ...
0
votes
1answer
531 views

What's the difference between keepalived and corosync, others?

I'm building a failover firewall for a server cluster and started looking at the various options. I'm more familiar with carp on freebsd, but need to use linux for this project. Searching google has ...
2
votes
1answer
111 views

Monit server went down

One of our developers needs some sort of notification in order to know whether the application is running smoothly or not.And We already decided that we will implement monit in order to get this ...
1
vote
0answers
146 views

Budget High Availability configuration for Linux (Debian) boxes [closed]

I try to set up a (pretty) high availability solution for a service that I run on Linux machines and here's what I come up with: - one front end server used for balancing. IT should have haproxy ...
1
vote
2answers
210 views

Server Clustering on differen OS : CentOs and Debian [closed]

I have two dedicated servers in two different locations. One at USA (Based on CentOS), another at Asia (Based on Debian). Need to implement High Availability HTTP Clustering. The main complexity is ...
0
votes
0answers
125 views

unmount failure because of process in D stat

Please suggest me how I can create a process in D (uninterruptable sleep) stat on mirror disk. Actually there is some bug in other code, that process some times create a process with D stat on MD and ...
0
votes
1answer
37 views

Heartbeat external plugin configuration format

I have developed an external Heartbeat v1 plugin, which expects its configuration by means of environment variables. AFAIK, this is what Heartbeat provides when configuring the plugin using the ...
1
vote
1answer
341 views

IP failover on different subnets

I have two real servers, on different subnets, each one with a permanent IP, and with a failover IP that can be used by either server. The hoster provides an API with which I can assign the failover ...
0
votes
1answer
460 views

HA Active/Active Squid configuration?

Hi all i would like to ask if someone have any experience into configuring squid within an active/active cluster. First here is the actual configuration, which i would like to replicate to another ...
1
vote
2answers
275 views

Linux High Availability

I have two Linux Active/Passive nodes on which i have the same simple processing application(not webapp). I just need to have a HA cluster when one machine is down the application on the second takes ...
6
votes
3answers
2k views

Is there a way to force heartbeat to add new ip addresses to the system without a full restart?

We utilize heartbeat for High Availability. I'd like to add an additional ip address to the heartbeat cluster, but I don't want to do a full restart of the cluster in the process. Is there a signal ...
1
vote
1answer
354 views

How do I load balance between two Linux machines?

Inspired by the Stack Overflow network, I am now obsessed with HAProxy and trying to use it myself. At the moment, each HAProxy box has got two network cards (well, two configured, I can have a ...
3
votes
1answer
4k views

Keepalived for more than 20 virtual addresses

I have set up keepalived on two Debian machines for high availability, but I've run into the maximum number of virtual IP's I can assign to my vrrp_instance. How would I go about configuring and ...
0
votes
2answers
2k views

heartbeat: find out machine's status within a cluster?

I'm trying to do some heartbeat debugging. Is there a simple way to ask a machine whether it thinks it's part of a cluster, and whether it's the master or the slave? I've tried $ heartbeat -s ...
5
votes
2answers
110 views

Insufficient channel capacity of 1GBit

There is a Caching Server (Varnish): it receives data from Amazon S3 on request, saves it for some time and gives it to the client. We have encountered the problem of insufficient channel capacity of ...
1
vote
0answers
408 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
votes
1answer
70 views

remote gateway and web servers down [closed]

I was asked this challenging question, which was quite tricky. It goes like this. Say there is a clustered environment of 40 web servers and the website is unfortunately down. You are in a remote ...
0
votes
1answer
71 views

Redundance for different processes running on the same server

We have a system consisting of different components/services like database, webserver, fileshare, some self programmed daemons, etc. We now have the requirement to make all components/services ...
0
votes
1answer
1k views

Pacemaker complex resource colocation

I am working on a pacemaker project for our master and slave databases to perform IP based failover. There will be two IP resources, one for the master, and one for the slave that have to move ...
1
vote
2answers
46 views

combined connection for 3 non-stable channels

I have 3 non-stable connections between 2 my Linux servers located in different countries. These 3 connections have different routes. From time to time one or two connections have packet loss problem ...
1
vote
3answers
1k views

ucarp: promote slave to master

I have got ucarp working on my two ubuntu servers. Apache, Postfix, Dovecot are working in HA mode so if one host goes down the other automatically takes over. My first problem is that I don't know ...
5
votes
5answers
1k views

Scaling server cluster setup

I'm in middle of re-building a website that currently gets about 4mil+ visitors a month (and that's going straight up lately). It's currently being run and hosted by an external company, but we're ...
2
votes
1answer
266 views

Change hostname on linux ha failover case

I have configured two machines to do a warm standby so that machine 2 can take the ip of machine 1 if that should fail and become its replacement. sadly, thats not enough, i need to change the ...
0
votes
3answers
2k views

Pinging Virtual IP for Linux HA cluster from a different subnet does not work

I have setup a Linux cluster with Corosync/Pacemaker, and the two cluster nodes are within the same subnet sharing a virtual IP. For machines within the same subnet, they can ping the virtual IP ...
13
votes
7answers
16k views

Alternatives to Heartbeat, Pacemaker and CoroSync?

Are there any major alternatives for automatic failover on Linux besides the typical Heartbeat/Pacemaker/CoroSync combinations? In particular, I'm setting up failover on EC2 instances, which only ...
1
vote
4answers
834 views

Server CPU spikes suddenly and becomes unusuable - Tips to monitor/analyze this?

my server has been going down over the last 24-48 hours, CPU spikes from 15% to 100% and server becomes unusable and all my sites go down as a consequence of it. Any tips on how I could track what is ...