- Cluster front end is unresponsive
- Check if the Coordinator(s) in question are started up.
- Check if the Agency is up and a leader has been elected. If not ensure that all or a majority of Agents are up and running.
- Check if all processes have been started up with the same
JWT_SECRET. If not ensure that the
JWT_SECRETused across the cluster nodes is identical for every process.
- Check if all cluster nodes have been started with SSL either dis- or enabled. If not decide what mode of operation you would like to run your cluster in, and consistently stick with for all Agents, Coordinators and DB-Servers.
- Check if network communication between the cluster nodes is such that all processes can directly access their peers. Do not operate proxies between the cluster nodes.
- Cluster front end announces errors on any number of nodes
- This is an indication that the Agency is running but either Coordinators or DB-Servers are disconnected or shut down. Establish network connection to or start the according nodes.
- Make sure that the nodes in question share the same
JWT_SECRETand SSL operation mode with the functioning nodes.
Dig deeper into cluster troubleshooting by going through the ArangoDB Cluster Administration Course.