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The Corosync Cluster Engine Qdevice
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corosync/corosync-qdevice
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Corosync-qdevice ---------------- corosync-qdevice is a daemon running on each node of a cluster. It provides a configured number of votes to the quorum subsystem based on a third-party arbitrator's decision. Its primary use is to allow a cluster to sustain more node failures than standard quorum rules allow. It is recommended for clusters with an even number of nodes and highly recommended for 2 node clusters. corosync-qnetd is a daemon running outside of the cluster with the purpose of providing a vote to the corosync-qdevice model net. It's designed to support multiple clusters and be almost configuration and state free. New clusters are handled dynamically and no configuration file exists. It's also able to run as non-root user - which is recommended. Connection between the corosync-qdevice model net client can be optionally configured with TLS client certificate checking. The communication protocol between server and client is designed to be very simple and allow backwards compatibility. Originally both qdevice and qnetd were part of the Corosync codebase (https://github.com/corosync/corosync) but because it got quite big we decided to split it into its own sub-project. Dependencies ------------ * Corosync >= 2.0 * NSS Installation ------------ $ ./autogen.sh $ ./configure $ make $ sudo make install
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The Corosync Cluster Engine Qdevice