How do you enable Stonith in a Pacemaker?
Enable STONITH for your HA topology.
- Enable the cluster STONITH property by using the following command. $ pcs property set stonith-enabled=true.
- Update the environment for your deployment to set the ibm-openstack. ha. pacemaker. properties. stonith-enabled. value property to true .
What is Stonith in Pacemaker?
In a Pacemaker cluster, the implementation of node level fencing is STONITH (Shoot The Other Node in the Head). The High Availability Extension includes the stonith command line tool, an extensible interface for remotely powering down a node in the cluster.
How do you stop the Stonith SBD primitive in the cluster?
- Stop the stonith sbd primitive in the cluster.
- Check the /etc/sysconfig/sbd configuration file to see which device and options are currently used.
- Stop sbd on all nodes and all devices: Use the following script: /usr/share/sbd/sbd.sh stop.
- Create the new sbd partition/s on one of the nodes.
How do you set up a SBD fence?
To set up and configure SBD fencing:
- Stop the cluster by running the following command on one of the nodes:
- On each node, install and configure the SBD daemon:
- Enable the sbd systemd service:
- Edit the /etc/sysconfig/sbd file and set the SBD_DEVICE parameter to identify the shared storage device.
What is STONITH enabled?
In order to guarantee the safety of your data, fencing (also called STONITH) is enabled by default. However, it also knows when no STONITH configuration has been supplied and reports this as a problem (since the cluster will not be able to make progress if a situation requiring node fencing arises).
How do I start STONITH SBD?
Procedure 11.5: Enabling and Starting the SBD Service Report Documentation Bug #
- On each node, enable the SBD service: root # systemctl enable sbd. It will be started together with the Corosync service whenever the Pacemaker service is started.
- Restart the cluster stack on each node: root # crm cluster restart.
What is Stonith enabled?
How do I start Stonith SBD?
What is a Stonith device?
STONITH (“Shoot The Other Node In The Head” or “Shoot The Offending Node In The Head”), sometimes called STOMITH (“Shoot The Other Member/Machine In The Head”), is a technique for fencing in computer clusters. Single node systems use a comparable mechanism called a watchdog timer.
What is pacemaker Corosync?
Pacemaker is an open source cluster resource manager (CRM), a system that coordinates resources and services that are managed and made highly available by a cluster. In essence, Corosync enables servers to communicate as a cluster, while Pacemaker provides the ability to control how the cluster behaves.
What is the impact of STONITH enabled cluster setting?
The use of stonith-enabled=false is completely inappropriate for a production cluster. It tells the cluster to simply pretend that failed nodes are safely powered off. Some vendors will refuse to support clusters that have STONITH disabled.
What is DRBD fencing?
Fencing is the process of isolating a node from a computer cluster or protecting shared resources when a node appears to be malfunctioning. As the number of nodes in a cluster increases, so does the likelihood of failure. 1.
How to set up A STONITH block device?
Once the STONITH device is configured, the Microsoft Service Management team will provide you with the STONITH block device (SBD) name and IP address of the iSCSI storage. You can use this information to configure STONITH setup. Follow these steps to set up HA using STONITH: Identify the SBD device. Initialize the SBD device. Configure the cluster.
How to set up a HA cluster with STONITH?
Follow these steps to set up HA using STONITH: Identify the SBD device. Initialize the SBD device. Configure the cluster. Set up the softdog watchdog. Join the node to the cluster. Validate the cluster.
What happens if you don’t use STONITH?
This kills both nodes. If you don’t use STONITH then a split-brain could have even worse consequences, especially in case of DRBD, where you could end up with both nodes becoming Primary. Data corruption is likely to happen and the split-brain must be resolved manually.