On this article on “14 Steps to Set up kubernetes on Ubuntu 18.04 and 16.04” we’re going to create Kubernetes cluster together with kubeadm on Ubuntu 18.04 (The similar steps can be utilized for the Ubuntu 16.04 as neatly)
We’re going to use two nodes
- Grasp node
- Employee node
- Studying time is set 20 mins
- Vagrant 2.2.7 or newest – For installationi nstruction
- VM VirtualBox – For set up instruction
Step 1 – Get started your vagrant field
As a minimal requirement for kubernetes set up we want –
- Grasp Node – 2 cpus, 2 GB Reminiscence
- Employee Node – 1 cpu, 1 GB Reminiscence
Use following Vagrantfile to spin up your vagrant field
Vagrant.configure("2") do |config| config.vm.outline "grasp" do |grasp| grasp.vm.box_download_insecure = true grasp.vm.field = "hashicorp/bionic64" grasp.vm.community "private_network", ip: "126.96.36.199" grasp.vm.hostname = "grasp" grasp.vm.supplier "virtualbox" do |v| v.identify = "grasp" v.reminiscence = 2048 v.cpus = 2 finish finish config.vm.outline "employee" do |employee| employee.vm.box_download_insecure = true employee.vm.field = "hashicorp/bionic64" employee.vm.community "private_network", ip: "188.8.131.52" employee.vm.hostname = "employee" employee.vm.supplier "virtualbox" do |v| v.identify = "employee" v.reminiscence = 1024 v.cpus = 1 finish finish finish
Step 2 – Replace host recordsdata on each grasp and employee node
grasp node – SSH into the grasp node
$ vagrant ssh grasp
Upload host access for grasp in addition to employee node
[email protected]:~$ sudo vi /and so forth/hosts 184.108.40.206 grasp.jhooq.com grasp 220.127.116.11 employee.jhooq.com employee
Check the employee node through sending from grasp
[[email protected] ~]$ ping employee PING employee.jhooq.com (18.104.22.168) 56(84) bytes of information. 64 bytes from employee.jhooq.com (22.214.171.124): icmp_seq=1 ttl=64 time=0.462 ms 64 bytes from employee.jhooq.com (126.96.36.199): icmp_seq=2 ttl=64 time=0.686 ms
Check the grasp node through sending from employee
[[email protected] ~]$ ping grasp PING grasp.jhooq.com (188.8.131.52) 56(84) bytes of information. 64 bytes from grasp.jhooq.com (184.108.40.206): icmp_seq=1 ttl=64 time=0.238 ms 64 bytes from grasp.jhooq.com (220.127.116.11): icmp_seq=2 ttl=64 time=0.510 ms
Step 3 – Set up Docker on each grasp and employee node
You wish to have to set up Docker on each the node.
So run the next set up command on each the nodes
Allow and get started docker
[email protected]:~$ sudo systemctl permit docker Created symlink /and so forth/systemd/formulation/multi-user.goal.needs/docker.provider → /lib/systemd/formulation/docker.provider. [[email protected] ~]$ sudo systemctl get started docker
Take a look at the docker provider standing
[[email protected] ~]$ sudo systemctl standing docker ● docker.provider - Docker Application Container Engine Loaded: loaded (/lib/systemd/formulation/docker.provider; enabled; seller preset: enabled) Energetic: lively (operating) since Thu 2020-04-23 19:10:59 UTC; 4s in the past Doctors: https://medical doctors.docker.com
Step 4 – Disable the firewall and turnoff the “swapping”
We’d like to disable firewall in addition to swapping on grasp in addition to employee node. As a result of to set up kubernetes we want to disable the swapping on each the nodes
[email protected]:~$ sudo ufw disable Firewall stopped and disabled on formulation startup [[email protected] ~]$ sudo swapoff -a
Step 5 – Set up “apt-transport-https” bundle
To download the kubernetes and its public we want to set up “apt-transport-https” bundle on each grasp in addition to employee node
[email protected]:~$ sudo apt-get replace && sudo apt-get set up -y apt-transport-https
Step 6 – Obtain the general public keys
We’d like to have the general public keys for gaining access to applications on Google Cloud.
So run the next command to get the general public keys on each grasp in addition to employee node
[email protected]:~$ curl -s https://applications.cloud.google.com/apt/document/apt-key.gpg | sudo apt-key upload - OK
Step 7 – Upload kubernetes repo
As a subsequent step we want to upload the kubernetes repo to each grasp in addition to employee node
[email protected]:~$ sudo bash -c 'echo "deb http://apt.kubernetes.io/ kubernetes-xenial primary" > /and so forth/apt/assets.record.d/kubernetes.record'
Step 8 – Set up kubernetes
Now after including the kubernetes repo we want to set up the kubernetes on each mater in addition to employee node
[email protected]:~$ sudo apt-get replace && sudo apt-get set up -y kubelet kubeadm kubectl
Step 9 – Allow and Get started kubelet
Alright now we’ve got put in the kubernetes, now we want to permit the kubelet reinforce for each grasp as neatly employee node
[[email protected] ~]$ sudo systemctl permit kubelet [[email protected] ~]$ sudo systemctl get started kubelet
Step 10 – Initialize the kubernetes cluster
Ok now we’ve got succeed in to level the place we’ve got completed the entire prerequisite for initializing the kubernetes cluster.
Let’s run the kubernetes initialization command on best on grasp
[[email protected] ~]$ sudo kubeadm init --apiserver-advertise-address=18.104.22.168 --pod-network-cidr=10.244.0.0/16
Be aware down kubeadm sign up for command which we’re going to use from employee node to sign up for the grasp node the use of token.
sudo kubeadm sign up for 22.214.171.124:6443 --token g2bsw7.5xr3bqc21eqyc6r7 --discovery-token-ca-cert-hash sha256:39b2b0608b9300b3342a8d0a0e9204c8fc74d45b008043a810f94e4f1fb8861f
Step 11 – Transfer kube config document to present consumer (best run on grasp)
Use the next command to get the kube config document and put it below running listing.
[[email protected] ~]$ mkdir -p $HOME/.kube [[email protected] ~]$ sudo cp -i /and so forth/kubernetes/admin.conf $HOME/.kube/config [[email protected] ~]$ sudo chown $(identification -u):$(identification -g) $HOME/.kube/config
Step 12 – Practice CNI from kube-flannel.yml(best run on grasp)
After the grasp of the cluster is able to deal with jobs and the services and products are operating, for the aim of creating bins out there to every different via networking, we want to arrange the community for container verbal exchange
[[email protected] ~]$ wget https://uncooked.githubusercontent.com/coreos/flannel/grasp/Documentation/kube-flannel.yml
Be aware – However since we’re running on the VMs so we want to test our Ethernet interfaces first.
Glance out for the Ethernet i.e. eth1 which has a ip handle 126.96.36.199(that is the ip handle which we used in vagrant document)
[[email protected] ~]$ ip a s
1: lo: <LOOPBACK,UP,LOWER_UP> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP crew default qlen 1000 hyperlink/ether 08:00:27:bb:14:75 brd ff:ff:ff:ff:ff:ff inet 10.0.2.15 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP crew default qlen 1000 hyperlink/ether 08:00:27:facebook:48:77 brd ff:ff:ff:ff:ff:ff inet 188.8.131.52 4: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP>
Now we want to upload the additional args for eth1 in kube-flannel.yml
[[email protected] ~]$ vi kube-flannel.yml
Searche for – “flanneld”
Within the args phase upload : – –iface=eth1
- --iface=eth1 args: - --ip-masq - --kube-subnet-mgr - --iface=eth1
Practice the flannel configuration
[email protected]:~$ kubectl practice -f kube-flannel.yml
podsecuritypolicy.coverage/psp.flannel.unprivileged created clusterrole.rbac.authorization.k8s.io/flannel created clusterrolebinding.rbac.authorization.k8s.io/flannel created serviceaccount/flannel created configmap/kube-flannel-cfg created daemonset.apps/kube-flannel-ds-amd64 created daemonset.apps/kube-flannel-ds-arm64 created daemonset.apps/kube-flannel-ds-arm created daemonset.apps/kube-flannel-ds-p.c64le created daemonset.apps/kube-flannel-ds-s390x created
Step 13 – Sign up for employee nodes to grasp(best run on employee)
Within the Step 10 we generated the token and kubeadm sign up for command.
Now we want to use that sign up for command from our employee node
[email protected]:~$ sudo kubeadm sign up for 184.108.40.206:6443 --token g2bsw7.5xr3bqc21eqyc6r7 --discovery-token-ca-cert-hash sha256:39b2b0608b9300b3342a8d0a0e9204c8fc74d45b008043a810f94e4f1fb8861f
W0423 19:27:00.344480 18268 sign up for.pass:346] [preflight] WARNING: JoinControlPane.controlPlane settings might be overlooked when control-plane flag isn't set. [preflight] Operating pre-flight exams [WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup motive force. The really helpful motive force is "systemd". Please practice the information at https://kubernetes.io/medical doctors/setup/cri/ [preflight] Studying configuration from the cluster... [preflight] FYI: You'll take a look at this config document with 'kubectl -n kube-system get cm kubeadm-config -oyaml' [kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.18" ConfigMap in the kube-system namespace [kubelet-start] Writing kubelet configuration to document "/var/lib/kubelet/config.yaml" [kubelet-start] Writing kubelet surroundings document with flags to document "/var/lib/kubelet/kubeadm-flags.env" [kubelet-start] Beginning the kubelet [kubelet-start] Ready for the kubelet to carry out the TLS Bootstrap... This node has joined the cluster: * Certificates signing request used to be despatched to apiserver and a reaction used to be won. * The Kubelet used to be knowledgeable of the new safe connection main points. Run 'kubectl get nodes' on the control-plane to see this node sign up for the cluster.
Step 14 – Take a look at the nodes standing(best run on grasp)
To test the standing of the nodes use
[[email protected] ~]$ kubectl get nodes
NAME STATUS ROLES AGE VERSION grasp In a position grasp 26m v1.18.2 employee In a position <none> 63s v1.18.2
So this used to be our amateur instructional which comes to round – 14 Steps to Set up kubernetes on Ubuntu 18.04 and 16.04.
With that we will be able to conclude what we’ve got accomplished –
- Congratulations we’ve got effectively put in kubernetes on Ubuntu 18.04
- After putting in kubernetes we’re effectively sign up for the employee nodes with grasp.
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