CentOS 7
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Kubernetes : Minikube : Install
2015/12/13
 
Configure Kubernetes which is Docker Container Orchestration System.
On this exmaple, Install Minikube to configure Single Node Cluster within a Virtual machine.
[1] Because using VM, Install a Hypervisor which is supported by Minikube.
On this example, Install KVM.
For other Hypervisors, it's possible to use VirtualBox, VMware Fusion, HyperKit.
[root@dlp ~]#
yum -y install qemu-kvm libvirt libvirt-daemon-kvm
[root@dlp ~]#
systemctl start libvirtd

[root@dlp ~]#
systemctl enable libvirtd

[2] Configure Kubernetes repository and Install Minikube.
[root@dlp ~]#
cat <<'EOF' > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-$basearch
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
EOF
[root@dlp ~]#
yum -y install kubectl
[root@dlp ~]#
wget https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64 -O minikube

[root@dlp ~]#
wget https://storage.googleapis.com/minikube/releases/latest/docker-machine-driver-kvm2

[root@dlp ~]#
chmod 755 minikube docker-machine-driver-kvm2

[root@dlp ~]#
mv minikube docker-machine-driver-kvm2 /usr/local/bin/
[root@dlp ~]#
minikube version

minikube version: v0.25.2
[root@dlp ~]#
kubectl version -o json 

{
  "clientVersion": {
    "major": "1",
    "minor": "10",
    "gitVersion": "v1.10.0",
    "gitCommit": "fc32d2f3698e36b93322a3465f63a14e9f0eaead",
    "gitTreeState": "clean",
    "buildDate": "2018-03-26T16:55:54Z",
    "goVersion": "go1.9.3",
    "compiler": "gc",
    "platform": "linux/amd64"
  }
}
# start minikube

[root@dlp ~]#
minikube start --vm-driver kvm2 

Starting local Kubernetes v1.9.4 cluster...
Starting VM...
Downloading Minikube ISO
 142.22 MB / 142.22 MB  100.00% 0s
Getting VM IP address...
Moving files into cluster...
Downloading localkube binary
 163.02 MB / 163.02 MB  100.00% 0s
 65 B / 65 B  100.00% 0s
Setting up certs...
Connecting to cluster...
Setting up kubeconfig...
Starting cluster components...
Kubectl is now configured to use the cluster.
Loading cached images from config file.
# show status

[root@dlp ~]#
minikube status

minikube: Running
cluster: Running
kubectl: Correctly Configured: pointing to minikube-vm at 192.168.39.110
[root@dlp ~]#
minikube service list 

|-------------|----------------------|-----------------------------|
|  NAMESPACE  |         NAME         |             URL             |
|-------------|----------------------|-----------------------------|
| default     | kubernetes           | No node port                |
| kube-system | kube-dns             | No node port                |
| kube-system | kubernetes-dashboard | http://192.168.39.110:30000 |
|-------------|----------------------|-----------------------------|
[root@dlp ~]#
minikube docker-env 

export DOCKER_TLS_VERIFY="1"
export DOCKER_HOST="tcp://192.168.39.110:2376"
export DOCKER_CERT_PATH="/root/.minikube/certs"
export DOCKER_API_VERSION="1.23"
# Run this command to configure your shell:
# eval $(minikube docker-env)
[root@dlp ~]#
kubectl cluster-info 

Kubernetes master is running at https://192.168.39.110:8443

To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
[root@dlp ~]#
kubectl get nodes 

NAME       STATUS    ROLES     AGE       VERSION
minikube   Ready     <none>    1h        v1.9.4
# a VM [minikube] is just running

[root@dlp ~]#
virsh list 

 Id    Name                           State
----------------------------------------------------
 1     minikube                       running
# possible to access with SSH to the VM

[root@dlp ~]#
minikube ssh 

                         _             _
            _         _ ( )           ( )
  ___ ___  (_)  ___  (_)| |/')  _   _ | |_      __
/' _ ` _ `\| |/' _ `\| || , <  ( ) ( )| '_`\  /'__`\
| ( ) ( ) || || ( ) || || |\`\ | (_) || |_) )(  ___/
(_) (_) (_)(_)(_) (_)(_)(_) (_)`\___/'(_,__/'`\____)
$
hostname

minikube
$
docker ps 

CONTAINER ID IMAGE                             COMMAND                CREATED     STATUS  PORTS NAMES
7d769e956904 fed89e8b4248                      "/sidecar --v=2 --..." 3 hours ago Up 3 ho       k8s_si..
39680ff90ecf 459944ce8cc4                      "/dnsmasq-nanny -v..." 3 hours ago Up 3 ho       k8s_dn..
e568a2ac6088 512cd7425a73                      "/kube-dns --domai..." 3 hours ago Up 3 ho       k8s_ku..
fd9bd248d82f e94d2f21bc0c                      "/dashboard --inse..." 3 hours ago Up 3 ho       k8s_ku..
f2c59bf5dd0a gcr.io/k8s-minikube/storage-prer  "/storage-provisioner" 3 hours ago Up 3 ho       k8s_st..
203ac12b2138 gcr.io/google_containers/pause3.0 "/pause"               3 hours ago Up 3 ho       k8s_PO..
6d88074f01dc gcr.io/google_containers/pause3.0 "/pause"               3 hours ago Up 3 ho       k8s_PO..
d44ea81b29f1 gcr.io/google_containers/pause3.0 "/pause"               3 hours ago Up 3 ho       k8s_PO..
3b26e522321b d166ffa9201a                      "/opt/kube-addons.sh"  3 hours ago Up 3 ho       k8s_ku..
5a0a0833416d gcr.io/google_containers/pause3.0 "/pause"               3 hours ago Up 3 ho       k8s_PO..
$
exit
# to stop minikube, do like follows

[root@dlp ~]#
minikube stop

Stopping local Kubernetes cluster...
Machine stopped.
# to remove minikube, do like follows

[root@dlp ~]#
minikube delete

Deleting local Kubernetes cluster...
Machine deleted.
[root@dlp ~]#
virsh list --all 

 Id    Name                           State
----------------------------------------------------
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