This document describes the installation of Kubernetes version 1.31.4 on a server with RHEL (Red Hat Enterprise Linux) 9.x operating system.


File to Download

Apinizer version 2025.01.1:
http://fss.apinizer.com/index.php/s/kqiTtY8UB3xZaHx/download

Kubernetes installation files:
http://fss.apinizer.com/index.php/s/1lFs6R41YB80Vom/download
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sudo tar xvf K8S-1.31-Rhel9.x-Offline.tar
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ls
#Command to verify that the following files exist.
#required_rpms, kube_rpms, kube-flannel.yml ,mongo_rpms, elasticsearch

# Firewall is turned off
sudo systemctl stop firewalld
sudo systemctl disable firewalld

# Disable SELinux to prevent communication problems on servers.
sudo setenforce 0
sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

# Close swap and delete the swap line in /etc/fstab to prevent it from restarting.
sudo swapoff -a
sudo vi /etc/fstab
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Installing Containerd Packages

yum install -y --cacheonly --disablerepo=* required_rpms/*.rpm --skip-broken
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#containerd module settings
sudo mkdir -p /etc/containerd   
 
sudo containerd config default | sudo tee /etc/containerd/config.toml
sudo sed -i 's/SystemdCgroup = false/SystemdCgroup = true/g' /etc/containerd/config.toml
 
 
#initializing and starting the containerd module 
sudo systemctl restart containerd
sudo systemctl enable containerd
systemctl status containerd
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Installing Kubernetes Packages

sudo modprobe overlay
sudo modprobe br_netfilter
 
sudo tee /etc/modules-load.d/k8s.conf <<EOF
overlay
br_netfilter
EOF

sudo vi /etc/sysctl.d/k8s.conf
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net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward=1
net.ipv4.tcp_max_syn_backlog=40000
net.core.somaxconn=40000
net.core.wmem_default=8388608
net.core.rmem_default=8388608
net.ipv4.tcp_sack=1
net.ipv4.tcp_window_scaling=1
net.ipv4.tcp_fin_timeout=15
net.ipv4.tcp_keepalive_intvl=30
net.ipv4.tcp_tw_reuse=1
net.ipv4.tcp_moderate_rcvbuf=1
net.core.rmem_max=134217728
net.core.wmem_max=134217728
net.ipv4.tcp_mem=134217728 134217728 134217728
net.ipv4.tcp_rmem=4096 277750 134217728
net.ipv4.tcp_wmem=4096 277750 134217728
net.core.netdev_max_backlog=300000
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sudo sysctl --system
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sudo yum install -y --cacheonly --disablerepo=* kube_rpms/*.rpm --skip-broken
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systemctl enable --now kubelet.service
 
#Kubernetes installation control
kubectl version --client && kubeadm version
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Installing Kubernetes Images

sudo ctr --namespace k8s.io images import kube_images/kube-apiserver-v1.31.4.tar           
sudo ctr --namespace k8s.io images import kube_images/kube-controller-manager-v1.31.4.tar  
sudo ctr --namespace k8s.io images import kube_images/kube-scheduler-v1.31.4.tar           
sudo ctr --namespace k8s.io images import kube_images/kube-proxy-v1.31.4.tar               
sudo ctr --namespace k8s.io images import kube_images/pause-3.10.tar                       
sudo ctr --namespace k8s.io images import kube_images/etcd-3.5.15-0.tar                    
sudo ctr --namespace k8s.io images import kube_images/coredns-v1.11.3.tar                  
sudo ctr --namespace k8s.io images import kube_images/flannel-cni-plugin-v1.6.2.tar        
sudo ctr --namespace k8s.io images import kube_images/flannel-v0.26.4.tar
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Although Kubernetes uses pause 3.10, containerd stays at 3.8 and this can cause the cluster not to start during kubeadm init. To fix this, you can change the pause version to 3.10 in the configuration file in /etc/containerd.


Important: Make sure to perform DNS resolution with "nslookup" before initiating with kubeadm.



This node will be chosen as the Kubernetes Control Plane since it is the first node in the cluster.

sudo kubeadm init --pod-network-cidr="10.244.0.0/16" --control-plane-endpoint="<MASTER_SERVER_IP_ADDRESS>" --upload-certs --kubernetes-version=v1.31.4
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mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
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Creating Flannel

kubectl apply -f flannel_yaml/kube-flannel.yml
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Installing Apinizer Images

sudo tar xvf 2025.01.1.tar
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sudo ctr --namespace k8s.io images import manager-2025.01.1.tar apinizercloud/manager:2025.01.1
sudo ctr --namespace k8s.io images import worker-2025.01.1.tar apinizercloud/worker:2025.01.1
sudo ctr --namespace k8s.io images import cache-2025.01.1.tar apinizercloud/cache:2025.01.1
sudo ctr --namespace k8s.io images import integration-2025.01.1.tar apinizercloud/integration:2025.01.1
sudo ctr --namespace k8s.io images import portal-2025.01.1.tar apinizercloud/portal:2025.01.1
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Installing MongoDB

sudo yum install -y --cacheonly --disablerepo=* mongo_rpms/*.rpm --skip-broken
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Note:  After the installation, the MongoDB configurations are the same as those in the document Installation of MongoDB on Red Hat OS.


Important: Perform the Apinizer installation through the Apinizer Installation and Configuration page.

Elasticsearch Installation

sudo mkdir /opt/elasticsearch
 
cd elasticsearch
 
# Move the file inside the offline installation folders.sudo mv elasticsearch/elasticsearch-7.9.2-linux-x86_64.tar.gz /opt/elasticsearch/ 
 
 
cd /opt/elasticsearch
sudo tar -xzf elasticsearch-7.9.2-linux-x86_64.tar.gz
 
#Skip to the Elasticsearch setup document. However, do not proceed with the first four steps in section 2.2.
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Important: After moving the installation file from its directory to the /opt/elasticsearch/ folder, you can perform the configurations on the Elasticsearch Installation on Red Hat Operating System page.