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Data Replication Approaches for Hot Standby Architecture

I'm relatively new to the world of storage & filesystems (please forgive me if I'm not using the correct language), and I'm currently researching ways to achieve a hot standby configuration -- i.e....
Pacopenguin's user avatar
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Why is balance-alb considered an invalid mode for high availability in a multi-switch topology?

In the Linux Ethernet Bonding Driver HOWTO, section 11.2 describes a multi-switch topology for high availability, including a nice ASCII art diagram of such a setup that involves two switches with an ...
kdt's user avatar
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IBM AIX - Method to identify Cluster or HA services

I am keen to learn if existing IBM AIX servers from different location have Clustering/HA features. Kindly let me know the steps to check. Thanks.
Nick eric adelee's user avatar
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High CPU utilization showing in CPU

We are running Two Node cluster using Redhat Pacemaker running on RHEL 7. Last thursday (3/2/2022) i updated kernel to latest version. And on Friday at 3:49 First node rebooted(Reason unknow) and ...
OmiPenguin's user avatar
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HA-Cluster / corosync / pacemaker: Active-Active cluster with service ip / service ip is not switching

How to configure crm to migrate the ServiceIP if one Service is failed? node 1: web01a \ attributes standby=off node 2: web01b \ attributes standby=off primitive Apache2 systemd:apache2 \ ...
FaxMax's user avatar
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Stop a pacemaker node when local shell script returns an error?

Is it possible to make pacemaker stopping a node when a local test script fails, and start a node if the local test script returns true again? This seems like a very simple problem, but as i can't ...
psicolor's user avatar
1 vote
1 answer
358 views

fence_virtualbox failed to reboot

I’m learning how to fence pacemaker using fence_virtualbox from [ClusterLabs] Fence agent for VirtualBox, but I can’t get it working. When I try to run stonith_admin –-reboot <node id> it failed....
Christophorus Reyhan's user avatar
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126 views

Options for high-availablility, high-throughput bonding in Linux

When trying to configure high-availablity (HA) bonding in Linux that should also use the bandwidth available, I wonder what the options are: The solution should ensure HA and optimal throughput (when ...
U. Windl's user avatar
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1 answer
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Pacemaker apache resource is Failed to access httpd status page after change to HTTPS

I get this error from pacemaker after i change apache from http to https. now my ocf::heartbeat:apache resource is not find status page. I generate SSL certificate separately for 3 servers. Everything ...
Karippery's user avatar
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2 answers
2k views

How do I mount a disk on /var/log directory even if I have process writing on it?

I would like to mount a disk on /var/log, the thing is, there are some process/services writing into it, such as openvpn, or system logs. Is there a way to mount a filesystem without having to restart ...
LinuxEnthusiast's user avatar
1 vote
2 answers
4k views

Keepalived not working?

I'm trying to create HA for HAProxy using keepalived on CentOS 8, here's what I have: Virtual IP: 10.10.10.14 HAProxy Server 1: 10.10.10.15 HAProxy Server 2: 10.10.10.18 and my keepalived ...
Gwynn's user avatar
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3 answers
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What is the best way to store a single counter persistently?

I have a simple bash script that increments a counter a few times per second, guaranteed less than 100 times per second. The script works fine, but I would like the counter to persist on machine ...
00prometheus's user avatar
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2 answers
879 views

Linux Pacemaker: Resource showing as "unrunnable start (blocked)" has been created

We are using SLES 12 SP4 We have observed few things from the today testing. Following are the steps: Step 1: When we create kernel panic (on Node01) with the command “echo 'b' > /proc/sysrq-...
Ram Too's user avatar
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high availability of file in Linux

I have a very specific scenario. I have set of config files and I want to maintain it at two different paths which would be nothing but a copy of the same files. For some reason, if one of the ...
Parthi's user avatar
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292 views

OpenLDAP Cluster

Trying to implement an OpenLDAP cluster, I already managed to set up the two backend LDAP servers in mirroring mode. The application (iRedMail) using the LDAP service is running on the same systems ...
arminV's user avatar
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1 vote
1 answer
2k views

Pacemaker: Primary node is rebooted and comes back is primary instead of standby

We are using pacemaker, corosync to automate failovers. We noticed one behaviour- when primary node is rebooted, the standby node takes over as primary - which is fine. When the node comes back ...
User2019's user avatar
1 vote
1 answer
2k views

Pacemaker Virtual IP cannot be routed outside of its network

I have a server cluster consisted of following setup: 2 Virtual Servers with 2 NIC's. eth0 (private network 10.0.0.0/16) and eth1 (public network 77.1.2.0/24 with gateway as 77.1.2.1) For HA-01 VPS ...
Marko Todoric's user avatar
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1 answer
3k 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 # ...
cody's user avatar
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1 vote
1 answer
1k 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 ...
rajeev's user avatar
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2 votes
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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 ...
John's user avatar
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2 answers
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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), ...
Greg's user avatar
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2 votes
1 answer
4k 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 ...
Centimane's user avatar
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2 votes
1 answer
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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://...
FreeSoftwareServers's user avatar
1 vote
1 answer
9k 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. ...
FreeSoftwareServers's user avatar
2 votes
1 answer
1k 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:...
FreeSoftwareServers's user avatar
2 votes
0 answers
235 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 ...
Tim Keller's user avatar
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1 answer
176 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 ...
Gonear's user avatar
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0 votes
1 answer
284 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 ...
Haru's user avatar
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0 answers
483 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 ...
William S.'s user avatar
1 vote
1 answer
4k 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 ...
Dieter Scholz's user avatar
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1 answer
2k 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 ...
GIRI's user avatar
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1 answer
656 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: ...
夏期劇場's user avatar
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1 vote
1 answer
55 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. ...
undefine's user avatar
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2 votes
0 answers
363 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. ?
Prashant Gupta's user avatar