update-index

Author: sangam14

content/docs/kubernetes/pre-requisites-kubeadm.md

@@ -0,0 +1,145 @@
+---
+title: "pre-requisites"
+description: " Includes configuring pre-requisites to install kubeadm  "
+weight: 2
+---
+
+
+
+####  Includes configuring pre-requisites to install kubeadm 
+
+###### step 01) Enable following ports and protcols 
+
+```
+on kubemaster : Open following ports : https://kubernetes.io/docs/reference/networking/ports-and-protocols/
+
+sudo ufw status
+sudo ufw enable
+sudo ufw allow 80/tcp
+sudo ufw allow 443/tcp
+sudo ufw allow 22/tcp
+sudo ufw allow 6443/tcp
+sudo ufw allow 2379/tcp
+sudo ufw allow 2380/tcp
+sudo ufw allow 10250/tcp
+sudo ufw allow 10259/tcp
+sudo ufw allow 10257/tcp
+sudo ufw allow 30000:32767/tcp
+sudo ufw reload
+sudo ufw status
+
+######  ----- kubenode01, kubenode02 ---#
+
+sudo ufw status
+sudo ufw enable
+sudo ufw allow 80/tcp
+sudo ufw allow 443/tcp
+sudo ufw allow 22/tcp
+sudo ufw allow 10250/tcp
+sudo ufw allow 30000:32767/tcp
+sudo ufw reload
+sudo ufw status
+
+sudo iptables -L    #--- on all nodes
+```
+###### step 02) 
+
+```
+------ Install Container Runtime ----------#
+
+#---- on all nodes : Forwarding IPv4 and letting iptables see bridged traffic : https://kubernetes.io/docs/setup/production-environment/container-runtimes/#forwarding-ipv4-and-letting-iptables-see-bridged-traffic
+
+cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
+overlay
+br_netfilter
+EOF
+
+sudo modprobe overlay
+sudo modprobe br_netfilter
+```
+
+######  sysctl params required by setup, params persist across reboots
+```
+cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
+net.bridge.bridge-nf-call-iptables  = 1
+net.bridge.bridge-nf-call-ip6tables = 1
+net.ipv4.ip_forward                 = 1
+EOF
+```
+
+######  Apply sysctl params without reboot
+```
+sudo sysctl --system
+```
+######  Verify that the br_netfilter, overlay modules are loaded
+```
+lsmod | grep br_netfilter
+lsmod | grep overlay
+```
+######  Verify that the net.bridge.bridge-nf-call-iptables, net.bridge.bridge-nf-call-ip6tables, and net.ipv4.ip_forward system variables are set to 1 in sysctl config
+```
+sysctl net.bridge.bridge-nf-call-iptables net.bridge.bridge-nf-call-ip6tables net.ipv4.ip_forward
+```
+
+######  We are selecting option 2 here using apt-get
+
+```
+######  install via package manager : https://docs.docker.com/engine/install/ubuntu/
+```
+
+######  Remove old versions
+for pkg in docker.io docker-doc docker-compose docker-compose-v2 podman-docker containerd runc; do sudo apt-get remove $pkg; done
+
+######  setup docker repository
+######  Add Docker's official GPG key:
+
+```
+sudo apt-get update
+sudo apt-get install ca-certificates curl
+sudo install -m 0755 -d /etc/apt/keyrings
+sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
+sudo chmod a+r /etc/apt/keyrings/docker.asc
+```
+######  Add the repository to Apt sources:
+
+```
+echo \
+  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
+  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
+  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
+sudo apt-get update
+```
+######  Install package
+###### we are only interested in containerd
+
+```
+#---- on all nodes : Install container runtime ----------- https://github.com/containerd/containerd/blob/main/docs/getting-started.md
+
+sudo apt-get install containerd.io 
+systemctl status containerd
+```
+######  check and install cgroup driver for container runtime and kubelet to integrate with control groups for getting resources from the instance.
+#! both kubelet and containerd should use same cgroup driver
+##### find if the instances are systemd instances
+```
+systemctl # if this command runs its a systemd system
+ps -p 1 #output should be something   1 ?        Ss     0:02 /sbin/init systemd
+```
+######  Configure cgroup driver
+
+```
+https://kubernetes.io/docs/setup/production-environment/container-runtimes/#containerd
+
+sudo vi /etc/containerd/config.toml
+```
+######  copy following content to install cgroup drivers : Tip : delete all the content inside that file using command mode :%d and copy following content. 
+```
+[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
+  [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
+    SystemdCgroup = true
+```
+##### save above config and run following
+```
+sudo systemctl restart containerd
+```
+

data/landing.yaml

@@ -159,6 +159,11 @@ featureGrid:
     - title: kubernetes
       icon: ⎈
       description: kubernetes is an open-source container-orchestration system for automating computer application deployment, scaling, and management.
+      modules:
+       - title: "pre-requisites to install kubeadm"
+         url: "content/docs/kubernetes/pre-requisites-kubeadm.md"
+       - title: "Use Kubeadm to install a basic cluster"
+         url: "content/docs/kubernetes/kubeadm.md"
 
     - title: Helm 
       icon: 👷⎈