We are running a 3 node mesos cluster and mesos master is running on each node. Also, 2 slaves are running on each node. Is this a good practice? 2 slaves on each cluster won't be sending too much offer and end up being overloaded? What is the recommended config for 3 nodes cluster?
It depends on your isolation setting (mainly cgroup, or any node level resources). In general, we don't recommend folks use multiple agents on a node.
It's possible to make it work by setting
cgroup_rootseparately for MesosContainerizer. For DockerContainerizer, currently, we hard codeDOCKER_NAME_PREFIX, making it not possible to use two agents on a node properly.Running Docker containers won't work properly because restarting one agent will cause Docker containers managed by the other agent to be deleted.