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Dear Unix Administrators,

A warm welcome to my blog which is a helping tool for Unix administrators. The main discussion topics over here are AIX and Linux platforms. We are going to put the details of AIX, Linux and their related topics on DevOps over here, as much as possible. Please read through it, give your valuable comments and feedback to identify the improvement opportunities. You may suggest the new topics for discussion as well.

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Thank you, IT Consulting Team
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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…