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Questions tagged [high-availability]

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VM > Centos 7 3-node HAcluster (pacemaker & corosync) (httpd wont start)

I've setup my cluster I'm now configuring my resources (2nd link). cluster setup: https://www.golinuxcloud.com/ste-by-step-configure-high-availability-cluster-centos-7/ cluster resource: https://...
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634 views

Apache resource failed to start in Pacemaker

I am using Pacemaker with Corosync to set up a basic Apache HA cluster with 3 nodes running CentOS7. For some reasons, I cannot get the apache resource started in pcs. Cluster IP: 192.168.200.40 # ...
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1answer
221 views

how to unexport NFS share on VCS HS cluster

**see imp update at bottom of orig. question. not sure how to unexport only the 'world' mountable share? I have a NFS server which had a share with world-mountable permissions. To make it mountable ...
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230 views

Setting up a kerberized HA NFS share

I'm trying to set up a kerberized NFS share from an HA cluster. I've successfully set up a krb-aware NFS share from a single server, I'm using a mostly identical configuration on the cluster. Exports ...
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1answer
1k views

RHEL High-Availability Cluster using pcs, configuring service as a resource

I have a 2 node cluster on RHEL 6.9. Everything is configured except I'm having difficulty with an application launched via shell script that created into a service (in /etc/init.d/myApplication), ...
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1answer
2k views

initrd built with NFS module cannot mount NFS root

I'm building a custom initrd so that I can boot diskless nodes with a tmpfs root rather than NFS root (a script in the initrd copies the contents of the root device to a tmpfs filesystem, then changes ...
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0answers
3k views

Pacemaker - Corosync - HA - Simple Custom Resource Testing - Status flapping - Started - Failed - Stopped - Started

I am testing using the OCF:Heartbeat:Dummy script and I want to make a very basic setup just to know it works and build on that. The only information I can find was this web blog here. https://...
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1answer
4k views

IP Source Address issues with PaceMaker Virtual IP

I am having trouble setting up a Virtual/Floating IP. In this specific circumstance I am using Pacemaker+Corosync to manage 2 Virtual IP's. One is internal and the other is external to our SIP Trunk. ...
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1answer
909 views

MySQL DRBD Resource failing to start PaceMaker + Corosync

So I have gotten to the point where I had all services running when I configured the cluster, but after reboot I am getting the following : Full list of resources: virtual_ip (ocf::heartbeat:...
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140 views

keepalived: How to only demote master if a backup can take over?

I am currently trying to setup a highly available system using keepalived. I have a check-script that returns rc=0 if the host it is executed on is the master. Unfortunately this script can fail for ...
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1answer
98 views

Achieving a high-availability ffmpeg system?

I wonder if there's a way to realize a sort of "high-availability" ffmpeg system. Let's say, I have two Linux servers: server1 and server2, dedicated to do some video conversion with ffmpeg. With a ...
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1answer
189 views

HAST sync complete FreeBSD 10.2

The handbook says: Check the status line in the output. If it says degraded, something is wrong with the configuration file. It should say complete on each node, meaning that the synchronization ...
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381 views

FreeBSD 10.2 - Is three-way HAST replication possible?

I have a pair of FreeBSD 10.2 servers using HAST to keep a volume replicated between them. I'm introducing two new storage nodes that have much newer hardware and will eventually replace the existing ...
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1answer
1k views

Use NIC bonding with independent switches

I'm using Debian and would like to setup a HA network with a few servers. This is my configuration: -----sw1--------------sw2------------ host1 / / \ \ / srv1 ...
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1answer
701 views

Couldn't connect to the primary server: postgresql HA installation

Trying to install Postgresql-9.4 High Availability (HA) in RHEL7, using three nodes. In all three nodes, installed postgresql, updated postgresql.conf and pg_hba.conf files accordingly. After ...
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1answer
462 views

File Server on High Availability (HA) Setup for LAMP?

I'm not sure what is the most proper way (industrial standard) to setup the High Availability servers (especially for LAMP Stack). Lets say i have: 2 Load-balanced Web Servers (Apaches) Question: ...
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1answer
48 views

Change internet link when fault

Situation: 2 internet links - A and B - both connected to linux router. 2 routing tables, one with default via A, second default via B. iptables and ip rule select "best" table for specific traffic. ...
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247 views

XFS over iSCSI share with cluster; will fencing cause data corruption/loss?

When using XFS on iSCSI share, where HA is enabled, nodes may be fenced by cluster. Will this result in data loss / corruption / etc. ?