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Kubernetes
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- 3. Aganda We will talkabout 3 How to install Kubernetes Ansible Kubespray Kubeadm What is Kubernetes Architecture API Server Controller Manager Scheduler How to run an App in Kubernetes Write yams file Expose your service
- 4. Kubernetes & Ansible Building aKubernetes production ready environment is quite complicated, so we use automated subordinate tools to help us implement it. What is Anisble Ansible is an IT automation tool. It can configure systems, deploy software, and orchestrate more advanced IT tasks such as continuous deployments or zero downtime rolling updates. 4
- 5. Kubespray Kubernetes-incubator Kubespray is acomposition of Ansible playbooks, inventory, provisioning tools, and domain knowledge for generic OS/Kubernetes clusters configuration management tasks. Kubespray provides: a highly available cluster composable attributes support for most popular Linux distributions (CoreOS, Debian Jessie, Ubuntu 16.04, CentOS/RHEL 7, Fedora/CentOS Atomic) continuous integration tests 5
- 6. Kubeadm Kubernetes-official kubeadm’s simplicity meansit can serve a wide range of use cases: New users can start with kubeadm to try Kubernetes out for the first time. Users familiar with Kubernetes can spin up clusters with kubeadm and test their applications. Larger projects can include kubeadm as a building block in a more complex system that can also include other installer tools. 6
- 7. Install guide Kubeadm Before youbegin 7 One or more machines running one of: Ubuntu 16.04+ Debian 9 CentOS 7 Or other… 2 GB or more of RAM per machine 2 CPUs or more Swap disabled. You MUST disable. Full network connectivity between all machines Ref: https://kubernetes.io/docs/tasks/ tools/install-kubeadm/
- 8. Install guide Kubeadm STEP #1 8 InstallingDocker sudo apt-get update sudo apt-get install -y docker.io or install Docker CE 17.03 sudo apt-get update sudo apt-get install -y apt-transport-https ca-certificates curl software-properties-common sudo curl -fsSL https://download.docker.com/linux/ubuntu/ gpg | apt-key add - sudo add-apt-repository "deb https://download.docker.com/ linux/$(. /etc/os-release; echo "$ID") $(lsb_release -cs) stable" sudo apt-get update && apt-get install -y docker-ce=$(apt-cache madison docker-ce | grep 17.03 | head -1 | awk '{print $3}') Is Guide is only for Ubuntu or Debian
- 9. Install guide Kubeadm STEP #2 9 Installingkubeadm , kubelet and kubectl sudo apt-get update && sudo apt-get install -y apt-transport-https curl sudo curl -s https:// packages.cloud.google.com/apt/doc/apt- key.gpg | sudo apt-key add - sudo cat <<EOF >/etc/apt/sources.list.d/ kubernetes.list deb http://apt.kubernetes.io/ kubernetes-xenial main EOF sudo apt-get update sudo apt-get install -y kubelet kubeadm kubectl Is Guide is only for Ubuntu or Debian
- 10. Install guide Kubeadm STEP #3 10 Disableswap sudo swapoff -a sudo sysctl -w vm.swappiness=0 sudo sed '/swap.img/d' -i /etc/fstab Set the following system parameters cat <<EOF | tee /etc/sysctl.d/k8s.conf net.ipv4.ip_forward = 1 net.bridge.bridge-nf-call-ip6tables =1 net.bridge.bridge-nf-call-iptables = 1 EOF sudo sysctl -p /etc/sysctl.d/k8s.conf Is Guide is only for Ubuntu or Debian
- 11. Install guide Kubeadm STEP #4 11 ConfirmDocker information CGROUP_DRIVER=$(sudo docker info | grep "Cgroup Driver" | awk '{print $3}') sudo sed -i "s|KUBELET_KUBECONFIG_ARGS=| KUBELET_KUBECONFIG_ARGS=--cgroup- driver=$CGROUP_DRIVER |g" /etc/systemd/ system/kubelet.service.d/10-kubeadm.conf Restart the Docker Daemon sudo systemctl daemon-reload sudo systemctl enable docker &&sudo systemctl start docker sudo systemctl status docker Is Guide is only for Ubuntu or Debian
- 12. Install guide Kubeadm STEP #5 12 Restartthe kubelet Daemon sudo systemctl daemon-reload sudo systemctl enable kubelet &&sudo systemctl start kublet sudo systemctl status kublet Using kubeadm to Create a Cluster sudo kubeadm init --pod-network-cidr=192.168.0.0/16 mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/ config sudo chown $(id -u):$(id -g) $HOME/.kube/config kubectl get node Is Guide is only for Ubuntu or Debian
- 13. Install guide Kubeadm STEP #6 13 Usingkubeadm join to the existing Cluster (on other node) kubeadm join --token <token> <master-ip>:<master-port> --discovery-token-ca-cert-hash sha256:<hash> Check Node is joined (on the master node) kubectl apply -f https://docs.projectcalico.org/v3.1/ getting-started/kubernetes/installation/hosted/rbac- kdd.yaml kubectl apply -f https://docs.projectcalico.org/v3.1/ getting-started/kubernetes/installation/hosted/kubernetes- datastore/calico-networking/1.7/calico.yaml kubectl get node Is Guide is only for Ubuntu or Debian
- 14. Kubernetes & Architecture A node is a workermachine in Kubernetes, previously known as a minion. A node may be a VM or physical machine, depending on the cluster. 14
- 15. What is CNCF ▪ TheCloud Native Computing Foundation builds sustainable ecosystems and fosters a community around a constellation of high- quality projects that orchestrate containers as part of a microservices architecture. CNCF CNCF serves as the vendor-neutral home for many of the fastest-growing projects on GitHub 15
- 17. What is Kubernetes ▪ Kubernetes isan open-source system for automating deployment, scaling, and management of containerized applications. Kubernetes Planet Scale Run Anywhere Never Outgrow 17
- 19. Kubernetes & Architecture A node is a workermachine in Kubernetes, previously known as a minion. A node may be a VM or physical machine, depending on the cluster. 19
- 20. Kubernetes & Master node Master componentsprovide the cluster’s control plane. Master components make global decisions about the cluster (for example, scheduling), and detecting and responding to cluster events (starting up a new pod when a replication controller’s ‘replicas’ field is unsatisfied). 20
- 21. Kubernetes & Worker node Node componentsrun on every node, maintaining running pods and providing the Kubernetes runtime environment. 21
- 22. Kubernetes & Worker node Addons arepods and services that implement cluster features. The pods may be managed by Deployments, ReplicationControllers, and so on. Namespaced addon objects are created in the kube-system namespace. 22
- 23. Kubernetes CNI A Cloud Native ComputingFoundation project, consists of a specification and libraries for writing plugins to configure network interfaces in Linux containers Flannel Calico Weave Kuryr Canal Cilium Contiv CNI (Container Network Interface) 23
- 24. Kubernetes CRI Consists of a protobufAPI, specifications/requirements, and libraries for container runtimes to integrate with kubelet on a node. Docker rkt frakti cri-containerd CRI (Container Runtime Interface) 24
- 25. Kubernetes CSI Enable storage vendors(SP) to develop a plugin once and have it work across a number of container orchestration (CO) systems. ceph Glusterfs CSI (Container Storage Interface) 25
- 26. Kubernetes Computing A Kubernetes podruns on a given node, it means a single pod cannot be stretched across multiple nodes. 26
- 27. Kubernetes Networking From network pointof view a routable IP address is assign to a given pod. Containers within a pod share an IP address and port space, and can find each other via localhost. 27
- 28. Kubernetes Storage The storage claimedby a pod is shared with all the containers within that pod. Once a persistent volume is claimed by a pod, it cannot be claimed/attached by another pod. Volumes enable data to survive container restarts and to be shared among the applications within the pod. 28
- 29. Kubernetes Scheduling By default the kube- scheduler service ensuresthat pods are only placed on nodes that have sufficient free resources. Also, it tries to balance out the resource utilisation of nodes. 29
- 30. Kubernetes Pod Pods are the smallestdeployable units of computing that can be created and managed in Kubernetes. 30
- 31. Kubernetes Deployment Deployment controller changesthe actual state to the desired state at a controlled rate. 31
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