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DIGIT Documentation "Public Version"
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Requirements
Master Cluster
Six or more machines running one of:
Ubuntu 16.04+
Debian 9
CentOS 7
RHEL 7
Container Linux (tested with 1576.4.0)
4 GB or more of RAM per machine (any less will leave little room for your apps)
2 CPUs or more
User Cluster
One or more machines running one of:
Ubuntu 16.04+
Debian 9
CentOS 7
RHEL 7
Container Linux (tested with 1576.4.0)
2 GB or more of RAM per machine (any less will leave little room for your apps)
2 CPUs or more
Full network connectivity between all machines in the cluster (public or private network is fine)
Unique hostname, MAC address, and product_uuid for every node. See here for more details.
Certain ports are open on your machines. See below for more details.
Swap disabled. You MUST disable swap in order for the kubelet to work properly.
Verify the MAC Address and product_uuid Are Unique for Every Node
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You can get the MAC address of the network interfaces using the command ip link or ifconfig -a
The product_uuid can be checked by using the command sudo cat /sys/class/dmi/id/product_uuid
It is very likely that hardware devices will have unique addresses, although some virtual machines may have identical values. Kubernetes uses these values to uniquely identify the nodes in the cluster. If these values are not unique to each node, the installation process may fail.
Check Network Adapters
If you have more than one network adapter, and your Kubernetes components are not reachable on the default route, we recommend you add IP route(s) so Kubernetes cluster addresses go via the appropriate adapter.
Check Required Ports
Master Cluster Master Node(s)
Protocol | Direction | Port Range | Purpose |
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TCP | Inbound | 6443* | Kubernetes API server |
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TCP | Inbound | 2379-2380 | etcd server client API |
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TCP | Inbound | 10250 | kubelet API |
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TCP | Inbound | 10251 | kube-scheduler |
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TCP | Inbound | 10252 | kube-controller-manager |
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TCP | Inbound | 10255 | Read-only kubelet API |
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Worker Node(s)& User Cluster Worker Nodes
Protocol Direction Port Range Purpose
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TCP | Inbound | 10255 | Read-only kubelet API | ||||||
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TCP | Inbound | 30000-32767 | NodePort Services** | ||||||
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** Default port range for NodePort Services.
Any port numbers marked with * are overridable, so you will need to ensure any custom ports you provide are also open.