System Administration

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Kubernetes Installation in CentOS 7
All the commands must be executed as root or with sudo privilege unless it is specified otherwise.1.Update the system to latest level.# yum update -y2.Verify the MAC address and product_uuid are unique for each node.# ifconfig -a# cat /sys/class/dmi/id/product_uuid3.Letting iptables see bridged trafficMake sure that the br_netfilter module is loadedThis can be done by running:lsmod | grep br_netfilterTo load it explicitly call:sudo modprobe br_netfilter4.Iptables to correctly see bridged traffic, ensure net.bridge.bridge-nf-call-iptables is set to 1 in your sysctl config.# cat <<EOF | sudo tee /etc/sysctl.d/k8s.confnet.bridge.bridge-nf-call-ip6tables = 1net.bridge.bridge-nf-call-iptables = 1EOF# sysctl –system5.Check required ports are enabled in the IPTABLES or Firewall.Control-plane node(s) - Enable these portsProtocolDirectionPort RangePurposeUsed ByTCPInbound6443*Kubernetes API serverAllTCPInbound2379-2380etcd server client APIkube-apiserve…