Oracle linux kubernetes install

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Oracle В® Linux
Oracle Linux Container Services for use with Kubernetes User’s Guide
Oracle Legal Notices
Oracle Documentation License
Install Docker and Kubernetes on Oracle Linux behind a proxy
Prerequisites
Install Docker Engine
Configure Proxy
Install Kubernetes Master Node
Install Kubernetes Worker Nodes
Oracle linux kubernetes install
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Oracle В® Linux

Oracle Linux Container Services for use with Kubernetes User’s Guide

Oracle Legal Notices

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Install Docker and Kubernetes on Oracle Linux behind a proxy

This article walks you through the steps required to install and configure Docker and Kubernetes on a bare metal or virtual machine running Oracle Linux (OL) 7.x that’s behind a corporate proxy.

Prerequisites

Make sure you meet these prerequisites:

OL 7.x using Unbreakable Enterprise Kernel Release 4 (UEK R4) or later
yum is configured to talk to your corporate proxy. For quick reference, you can edit “/etc/yum.conf” and add or update the proxy entry:

Install Docker Engine

Edit “/etc/yum.repos.d/public-yum-ol7.repo” and enable the “ol7_addons” channel. It’s a matter of setting the “enabled” option to “1” under “ol7_addons” section. Next, run yum to install the latest docker engine that is made available on this channel:

Configure Proxy

Create the file “/etc/systemd/system/docker.service.d/http-proxy.conf” and add the following:

Make sure to replace the “

” and “ ” with appropriate values for your environment.

Now run the following commands to start the docker engine and ensure that it starts back on reboots:

You can check the status and version of docker by running the following commands:

Using a web browser, login to Oracle Container Registry website at https://container-registry.oracle.com. Navigate to the Container Services category and accept the license agreement.

Install Kubernetes Master Node

Make sure the “ol7_addons” channel is enabled (refer to install docker engine section above). Run yum to install “kubeadm”:

Now login to the Oracle Container registry using Docker CLI:

As root, run the following command to add sbin to the PATH variable:

As root, run the following command to add a port forwarding rule:

If you are running “firewalld” service, as root, run the following commands:

And finally, as root, run this command to configure the host as a master node:

If there are any issues, the above command will notify you with possible remedies. After a successful run, the command will print the next steps which boil down to preparing the regular user to run “kubectl” commands and the command to be run on other hosts which will act as worker nodes in the kubernetes cluster. Take a note of the token and hash that you will use later to join worker nodes to the cluster.

Install Kubernetes Worker Nodes

On each additional OL machine that should be provisioned as a worker node, repeat all the steps, except the last one, that you executed above while provisioning the master node.

Instead of running the last step from above, as root, run the kubeadm-setup join command:

After provisioning the worker nodes, you can go back to the master node and run the following command to get a glimpse of all the nodes:

You are all set to start deploying services and play with Kubernetes.

Refer to the following links for additional information and in-depth documentation:

Oracle Container Runtime for Docker
Oracle Container Services for Kubernetes

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Oracle linux kubernetes install

How To Manually Install Kubernetes for Oracle Linux in Oracle OCI

Another related doc

To mannually install Kubernetes in Oracle OCI via Oracle Released Docker and Kubernetes version from Oracle Container Registry Refer official doc

Please turn off TX checksum offload if you have VM in OCI with UEK4 kernel and Broadcomm driver. Refer doc

Читайте также: Windows everlast что это

Preparation(All Kubernetes Nodes) (set http proxy if necessary in intranet):

Assume Master nodes and worker nodes are in the same VCN. Otherwise we need to add access rules in OCI policy to let nodes communicate with each other. details in doc
#yum update -y
#yum-config-manager —enable ol7_addons
#yum install docker-engine
Add proxy for docker daemon and docker containers if necessary in intranet. refer my blog
Move Docker Images OS Files From Default To Different OS Location for space concern. refer my blog
#systemctl enable docker
#systemctl start docker
#docker login container-registry.oracle.com/kubernetes_developer . We can get free account from Oracle Container Registry
#iptables -P FORWARD ACCEPT
#firewall-cmd —add-masquerade —permanent
#firewall-cmd —add-port=10250/tcp —permanent
#firewall-cmd —add-port=8472/udp —permanent
On Master Node only: # firewall-cmd —add-port=6443/tcp —permanent
#systemctl restart firewalld
#/usr/sbin/setenforce 0
#vim /etc/selinux/config and set SELINUX=permissive

Setting Master Node

#yum install kubeadm
#export KUBE_REPO_PREFIX=container-registry.oracle.com/kubernetes_developer
#kubeadm-setup.sh up

_.
Please wait .
— 75% completed
Waiting for the control plane to become ready .
.
100% completed
.
[===> PLEASE DO THE FOLLOWING STEPS BELOW: > $HOME/.bashrc
use this command to verify: $ kubectl get pods -n kube-system, output would be like

[k8suser@instance-cas-mt2 .kube]$ kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
etcd-instance-cas-mt2 1/1 Running 0 2h
kube-apiserver-instance-cas-mt2 1/1 Running 1 2h
kube-controller-manager-instance-cas-mt2 1/1 Running 0 2h
kube-dns-5c57c4787c-xzsgz 3/3 Running 0 2h
kube-flannel-ds-87xb9 1/1 Running 0 2h
kube-proxy-mwn46 1/1 Running 0 2h
kube-scheduler-instance-cas-mt2 1/1 Running 0 2h
kubernetes-dashboard-7df769d745-m4mgx 1/1 Running 0 2h

Setting Worker Node:

#yum install kubeadm
export KUBE_REPO_PREFIX=container-registry.oracle.com/kubernetes_developer && kubeadm-setup.sh join 100.106.146.3:6443 —token ******* —discovery-token-ca-cert-hash sha256:*********
In the master node ,use kubeadm token list or kubeadm token create to get token
In the master node, use below to get SHA256 CA certificate

_Checking if env is ready .
Checking whether docker can pull busybox image .
Checking access to container-registry.oracle.com/kubernetes_developer .
Trying to pull repository container-registry.oracle.com/kubernetes_developer/kube-proxy-amd64 .
v1.10.5: Pulling from container-registry.oracle.com/kubernetes_developer/kube-proxy-amd64
Digest: sha256:*****
Status: Image is up to date for container-registry.oracle.com/ku bernetes_developer/kube-proxy-amd64:v1.10.5
Checking whether docker can run container .
Checking firewalld settings .
Checking iptables default rule .
Checking br_netfilter module .
Checking sysctl variables .
Enabling kubelet .
Created symlink from /etc/systemd/system/multi-user.target.wants /kubelet.service to /etc/systemd/system/kubelet.service.
Check successful, ready to run ‘join’ command .
[preflight] Running pre-flight checks.
[validation] WARNING: kubeadm doesn’t fully support multiple API Servers yet
[discovery] Trying to connect to API Server «100.106.146.3:6443»
[discovery] Trying to connect to API Server «100.106.146.3:6443»
[discovery] Created cluster-info discovery client, requesting info from «https://100.106.146.3:6443»
[discovery] Created cluster-info discovery client, requesting info from «https://100.106.146.3:6443»
[discovery] Requesting info from «https://100.106.146.3:6443» again to validate TLS against the pinned public key
[discovery] Requesting info from «https://100.106.146.3:6443» again to validate TLS against the pinned public key
[discovery] Cluster info signature and contents are valid and TLS certificate validates against pinned roots, will use API Server «100.106.146.3:6443»
[discovery] Successfully established connection with API Server «100.106.146.3:6443»
[discovery] Cluster info signature and contents are valid and TLS certificate validates against pinned roots, will use API Server «100.106.146.3:6443»
[discovery] Successfully established connection with API Server «100.106.146.3:6443»
This node has joined the cluster:

Certificate signing request was sent to master and a response was received.

The Kubelet was informed of the new secure connection details.
Run ‘kubectl get nodes’ on the master to see this node join the cluster._

kubectl get nodes

NAME STATUS ROLES AGE VERSION
instance-test-db2 Ready 5m v1.10.5+2.0.2.el7
instance-test-mt2 Ready master 3h v1.10.5+2.0.2.el7

admin.conf controller-manager.conf kubelet.conf scheduler.conf plus pki and other manifests files can be found in host /etc/kubernetes/

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To mannually install Kubernetes in Oracle OCI via Oracle Released Docker and Kubernetes version

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