Install Kubernetes Ubuntu

To install kubernetes on ubuntu server, you can install with these scripts on my github or follow the guide.

https://github.com/alegarciadelrio/kubernetes/tree/main/installation-script-ubuntu

 

 

 

# 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 \
$(. /etc/os-release && echo "${UBUNTU_CODENAME:-$VERSION_CODENAME}") stable" | \
sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update



sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
sudo groupadd docker
sudo usermod -aG docker $USER newgrp docker
sudo systemctl enable docker
sudo systemctl start docker

Install Kubectl
curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl.sha256"
echo "$(cat kubectl.sha256) kubectl" | sha256sum --check
sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl 

kubectl version --client
kubectl version --client --output=yaml

 

Install repository

curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.32/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg

 echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.32/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list



Install the tools

sudo apt update 

sudo apt install kubeadm kubelet kubectl

sudo apt-mark hold kubeadm kubelet kubectl

kubeadm version









1. Disable all swap spaces with the swapoff command:

sudo swapoff -a

Then use the sed command below to make the necessary adjustments to the /etc/fstab file: sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

2. Load the required containerd modules. Start by opening the containerd configuration file in a text editor, such as nano: 

sudo vim /etc/modules-load.d/containerd.conf

3. Add the following two lines to the file:

overlay
br_netfilter


4. Next, use the modprobe command to add the modules: 

sudo modprobe overlay
sudo modprobe br_netfilter


5. Open the kubernetes.conf file to configure Kubernetes networking: 

sudo vim /etc/sysctl.d/kubernetes.conf


6. Add the following lines to the file: 

net.bridge.bridge-nf-call-ip6tables = 1 

net.bridge.bridge-nf-call-iptables = 1 

net.ipv4.ip_forward = 1

sudo sysctl --system


Initialize Kubernetes on Master Node
sudo vim /etc/default/kubelet


Add the following line to the file:

KUBELET_EXTRA_ARGS="--cgroup-driver=cgroupfs"






Reload the configuration
sudo systemctl daemon-reload && sudo systemctl restart kubelet


sudo vim /etc/docker/daemon.json
Append the following

{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2"
}




sudo systemctl daemon-reload && sudo systemctl restart docker

sudo vim /etc/systemd/system/kubelet.service.d/10-kubeadm.conf

add the following line to the file:

Environment="KUBELET_EXTRA_ARGS=--fail-swap-on=false"

 

 

 

sudo systemctl daemon-reload && sudo systemctl restart kubelet

Edit the file and comment the following line:

sudo vim /etc/containerd/config.toml

Comment the line that says disable cri.
#disabled_plugins = ["cri"]

 

Restart the service

sudo systemctl restart containerd.service

 

Start the kubeadm.

sudo kubeadm init --control-plane-endpoint=master-node --upload-certs

 

 Try to run

kubectl get all

Then initialize calico

curl https://docs.projectcalico.org/manifests/calico.yaml -O 

curl -O https://calico-v3-25.netlify.app/archive/v3.25/manifests/calico.yaml

kubectl apply -f calico.yaml 

sudo systemctl restart containerd.service

See also:
https://github.com/containerd/containerd/blob/main/script/setup/install-cni

If doesn't work.

sudo kubeadm reset

sudo kubeadm init --control-plane-endpoint=master-node --upload-certs

 

Then copy the credentials

mkdir -p $HOME/.kube

sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

sudo chown $(id -u):$(id -g) $HOME/.kube/config

 

Not use docker:
sudo systemctl disable docker

sudo systemctl disable docker.socket

 

 

Run this on the master node:

kubectl taint nodes --all node.kubernetes.io/not-ready-

 kubectl taint nodes --all node-role.kubernetes.io/control-plane-

 

On the node side:

sudo systemctl stop apparmor && sudo systemctl disable apparmor

# 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 \
$(. /etc/os-release && echo "${UBUNTU_CODENAME:-$VERSION_CODENAME}") stable" | \
sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update



sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
sudo groupadd docker
sudo usermod -aG docker $USER newgrp docker
sudo systemctl enable docker
sudo systemctl start docker





Install Kubectl
curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl.sha256"
echo "$(cat kubectl.sha256) kubectl" | sha256sum --check
sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl 

kubectl version --client
kubectl version --client --output=yaml

 

Install repository

curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.32/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg

 echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.32/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list



Install the tools

sudo apt update 

sudo apt install kubeadm kubelet kubectl

sudo apt-mark hold kubeadm kubelet kubectl

kubeadm version









1. Disable all swap spaces with the swapoff command:

sudo swapoff -a

Then use the sed command below to make the necessary adjustments to the /etc/fstab file: sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

2. Load the required containerd modules. Start by opening the containerd configuration file in a text editor, such as nano: 

sudo vim /etc/modules-load.d/containerd.conf

3. Add the following two lines to the file:

overlay
br_netfilter


4. Next, use the modprobe command to add the modules: 

sudo modprobe overlay
sudo modprobe br_netfilter


5. Open the kubernetes.conf file to configure Kubernetes networking: 

sudo vim /etc/sysctl.d/kubernetes.conf


6. Add the following lines to the file: 

net.bridge.bridge-nf-call-ip6tables = 1 

net.bridge.bridge-nf-call-iptables = 1 

net.ipv4.ip_forward = 1

sudo sysctl --system

Then edit the following file

sudo vim /etc/default/kubelet


Add the following line to the file:

KUBELET_EXTRA_ARGS="--cgroup-driver=cgroupfs"






Reload the configuration
sudo systemctl daemon-reload && sudo systemctl restart kubelet

Edit the hostname to match the other server

sudo vim /etc/hosts

 

Run the command that shows on the deployment of the master node (when you do kubeadm init).

sudo kubeadm join pb-kube-d003:6443 --token iwwfd7.241eota*******     --discovery-token-ca-cert-hash sha256:58f7af701*********************************

Run this on the master node:

kubectl taint nodes --all node.kubernetes.io/not-ready-

 

More info on
https://discuss.kubernetes.io/t/error-while-setting-up-a-clucter-unable-to-join-the-worker-node-please-someone-help-me-im-an-intern-help-me-to-do-this/27096/2

https://phoenixnap.com/kb/install-kubernetes-on-ubuntu

 https://www.linuxtechi.com/install-kubernetes-on-ubuntu-22-04/

 

Test kubernetes API connection

 

 Based on this service account to deploy from Azure DevOps

https://github.com/alegarciadelrio/kubernetes/tree/main/service-account-for-eks-azure-devops

 

We can figure out the token and the certificate 

SECRET=deploy-robot-secret
TOKEN=$(kubectl get secret ${SECRET} -n default -o json | jq -Mr '.data.token' | base64 -d) # Extract, decode and write the ca.crt to a temporary location
kubectl get secret ${SECRET} -o json | jq -Mr '.data["ca.crt"]' | base64 -d > /tmp/ca.crt # Get the API Server location
APISERVER=https://$(kubectl -n default get endpoints kubernetes --no-headers | awk '{ print $2 }')

Then you can run the following on your pc:
CA_CERT=ca.crt
TOKEN="wfpZ7Yz7YfsZNwcXOwtXvNQ5Z4OJnSdlcq8vmEsug"
NAMESPACE="dfdfdfd=="
curl --cacert $CA_CERT -H "Authorization: Bearer $TOKEN" "https://host:6443/version"

git toolbox

List all branches

git branch -v -a


Delete a branch:git branch -d local_branch_name

Force delete branch:
git branch -D local_branch_name




Create a branchgit checkout -b newbranch

git checkout commit -m "files modified"



Push origin changes to the new branch
git push origin newbranch




Connect to a remote branch:

#git checkout feature/auth0-configuration
branch 'feature/auth0-configuration' set up to track 'origin/feature/auth0-configuration'.
Switched to a new branch 'feature/auth0-configuration'



Modify the files that you want:

# git status
On branch feature/auth0-configuration
Your branch is up to date with 'origin/feature/auth0-configuration'.

Changes not staged for commit:
(use "git add <file>..." to update what will be committed)
(use "git restore <file>..." to discard changes in working directory)
modified: frontend/Dockerfile

no changes added to commit (use "git add" and/or "git commit -a")



# git add frontend/Dockerfile



# git commit -m 'fix: Resolve docker file with env variables.'
[feature/auth0-configuration 76f71d4] fix: Resolve docker file with env variables.
1 file changed, 5 insertions(+), 10 deletions(-)



# git push origin feature/auth0-configuration
Enumerating objects: 7, done.
Counting objects: 100% (7/7), done.


To delete all docker images:docker rmi -f $(docker images -aq)

Send teams notification when Azure DevOps Pull Request is created

A Logic App that notifies Pull Request reviewers?

 

First create an Azure Logic App with the following code:

https://github.com/alegarciadelrio/azuredevops/tree/main/notify-pull-request-reviewers

 

Copy the URL. And go to go to Azure DevOps Project settings -> Service hooks -> Create new subscription ->  Webhook

 

Enter the URL. Press test and finish.

 

Study the json content on the run history of the development tools of the Logic app.

 

 

 

 The logic app should look like this. You can run the logic app on Run History.

 

Done, you have a Logic App that notifies reviewers of the Pull Request.