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The Qlustar HA Stack

Qlustar HAStack

The Qlustar HA Stack contains all components needed, to configure cluster head-nodes or storage nodes in a high-availability (HA) setup and protect them from SPOFs (single point of failures). It is based on the corosync + pacemaker infrastructure, coming with its own thoroughly tested Debian packages of the former. The Qlustar packages are different from the upstream core platform ones, since the latter were often found to be buggy, not well maintained and hence unsuitable for a reliable HA setup.

The Q-Leap team responsible for the Qlustar HA Stack has well over a decade of experience in designing, setting up and operating HA clusters for various types of mission-critical customer systems in industry, research and academia. Correctly configured clusters running the Qlustar HA Stack feature exceptional service availability achieved by efficient monitoring of the services they provide, combined with reliable and fast service fail-over in case of hard- or software failures. Contact us, if you need assistance in setting up or operate a reliable HA cluster.

Qlustar Resource Agents

A Pacemaker resource agent is an external program (mostly shell scripts), that abstracts the service, it provides, to present a consistent interface for starting, stopping and monitoring the service. Such an agent is required for each type of service that is supposed to operate in HA mode. The Qlustar HA stack comes with a large set of well-tested resource agents, that cover the services needed on typical HPC, storage or cloud clusters. Among them are agents for:

  • ZFS pools and filesystems.
  • Lustre OSTs, MDTs, MGTs and client.
  • Slurm control and database daemon.
  • Torque pbs-server daemon.
  • NFS kernel server and its exports.
  • Samba file server.
  • Apache web server.
  • MySQL/MariaDB databases.
  • Oracle databases and listener.
  • MD software RAID devices.
  • LVM logical volumes.
  • Other Linux Filesystems.
  • DRBD resources.
  • Virtual IP addresses.
Using these resource agents and within the Pacemaker framework you can set up an HA cluster with any combination of the corresponding services as so-called resources. The configured services (resources) will then be protected from hard- or software failures.

Qlustar Resource Agents
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