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- CentOS 7 (minimum supported version);
- at least 2 GB of RAM and 2 CPUs per machine;
- opening doors on the control plane (6443, 2379-2380, 10250-10252) and on the worker (10250, 30000-32767);
- complete connectivity between the cluster nodes and uniqueness  uniqueness of MAC address and product_uuid for each node;
- complete connectivity between the cluster nodes;
- swap disabled on nodes.
Now let's do a little study for the last 2 3 points of the list.
Get the MAC address and product_uuid of the cluster nodes, making sure they are different from each other, using the commands
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# Equivalent commands to get MAC address (type format similar to "fa:16:3d:c9:ac:83") $ ip link $ ifconfig -a # Command to get the product_uuid (type format similar to "92DD146C-F404-4253-J518-49602Z7C1B8F") $ sudo cat /sys/class/dmi/id/product_uuid |
Make About complete connectivity, make sure the br_netfilter module has been loaded. Use the command as verification
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# Verify that the br_netfilter module is present (you should get an output like the following) $ lsmod | grep br_netfilter br_netfilter 22256 0 bridge 151336 1 br_netfilter # If not present, use $ sudo modprobe br_netfilter |
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