Reverting a cluster member into a standalone machine
This is a recovery operation. It might break the cluster and you might lose data. All data is removed from the machine that is reverted to a standalone machine. If the cluster does not have fault tolerance enabled, or if multiple machines have failed, you will lose all data in the cluster.
You might need to convert a member of the cluster into a standalone machine in the following circumstances:
- When the machine that was unresponsive and was forcibly removed from the cluster becomes available. If you cannot force remove the machine using the UI, you can do so from the command line. For more information, see the user example.
- When you cannot recover the whole cluster because most machines in the cluster are permanently down, but you want to reuse the machines.
Use the tw_cluster_control command line tool with the
--revert-to-standalone option on the machine you need to make standalone.
Removing all failed machines from the cluster
You can do this by running
tw_cluster_control from any running member of the cluster. The order of these steps is particularly important. See the note below.
- Log in to the appliance command line as the tideway user.
tw_cluster_controlto remove all failed machines from the cluster. You need to supply the password of the system user. Enter:
Before you can reuse any machine removed from the cluster, you must revert it to a standalone configuration. All data is lost in this process. On the command line of the machine you want to revert, enter:
If a machine in the cluster has failed, and you
--revert-to-standalone before removing it from the cluster, then you must shut down the reverted machine before issuing the