Getting started on OpenShift

 OK, guys, time to take the OpenShift plunge.

Need this for my work and I will setting it up in my home lab.

My references:

https://itnext.io/guide-installing-an-okd-4-5-cluster-508a2631cbee

https://medium.com/@craig_robinson/openshift-4-4-okd-bare-metal-install-on-vmware-home-lab-6841ce2d37eb

https://emarcel.com/installing-openshift-origin-in-a-home-lab/

Unfortunately, the above does not work, been trying so many days...

Firstly the IP addresses have to follow as per instructions as or else it will not work as it is hardcoded esp in the DNS

Remove node from cluster

 kubectl get nodes

1) First drain the node

kubectl drain <node-name>

You might have to ignore daemonsets and local-data in the machine

kubectl drain <node-name> --ignore-daemonsets --delete-local-data

2) Edit instance group for nodes (Only if you are using kops)

kops edit ig nodes

Set the MIN and MAX size to whatever it is -1 Just save the file (nothing extra to be done)

You still might see some pods in the drained node that are related to daemonsets like networking plugin, fluentd for logs, kubedns/coredns etc

3) Finally delete the node

kubectl delete node <node-name>

4) Commit the state for KOPS in s3: (Only if you are using kops)

kops update cluster --yes

OR (if you are using kubeadm)

If you are using kubeadm and would like to reset the machine to a state which was there before running kubeadm join then run

kubeadm reset

Pods not autostarting

 I realised that when i reboot my VMs, all the pods were not restarting.

Then I realised it was because my DB2 was not auto-started.

To start DB2 upon boot: https://www.ibm.com/support/pages/configure-db2-instance-start-automatically-boot-time

To determine if an instance is enabled to automatically start at boot time, execute this command logged in as the instance owner:

db2set DB2AUTOSTART -i db2inst1

A return of "YES" means the instance is set to start automatically. Otherwise it is not set.

To configure the instance to start automatically at boot:

db2iauto -on <instance name>

In the instance file <InstanceHome>/sqllib/profile.env there will be an entry like this:

DB2AUTOSTART='YES'

If there is an issue starting the DB2 instance, take a look at the following file:

<InstanceHome>/sqllib/db2dump/db2diag.log

kubectl get nodes NotReady

 Got this error: 

[root@unica12master .kube]# kubectl get nodes

NAME                        STATUS     ROLES    AGE   VERSION

unica12master.localdomain   NotReady   master   11m   v1.18.6

unica12node1.localdomain    NotReady   <none>   11m   v1.18.6

unica12node2.localdomain    NotReady   <none>   10m   v1.18.6

Upon checking: alse reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized (ned to install weave). See : https://stackoverflow.com/questions/52675934/network-plugin-is-not-ready-cni-config-uninitialized

(do this on the msater only)

$ export kubever=$(kubectl version | base64 | tr -d '\n')
$ kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$kubever"

[root@unica12master .kube]# kubectl describe nodes

Name:               unica12master.localdomain

Roles:              master

Labels:             beta.kubernetes.io/arch=amd64

                    beta.kubernetes.io/os=linux

                    kubernetes.io/arch=amd64

                    kubernetes.io/hostname=unica12master.localdomain

                    kubernetes.io/os=linux

                    node-role.kubernetes.io/master=

Annotations:        kubeadm.alpha.kubernetes.io/cri-socket: /var/run/dockershim.sock

                    node.alpha.kubernetes.io/ttl: 0

                    volumes.kubernetes.io/controller-managed-attach-detach: true

CreationTimestamp:  Sun, 09 Aug 2020 05:49:34 +0800

Taints:             node-role.kubernetes.io/master:NoSchedule

                    node.kubernetes.io/not-ready:NoSchedule

Unschedulable:      false

Lease:

  HolderIdentity:  unica12master.localdomain

  AcquireTime:     <unset>

  RenewTime:       Sun, 09 Aug 2020 05:59:53 +0800

Conditions:

  Type             Status  LastHeartbeatTime                 LastTransitionTime                Reason                       Message

  ----             ------  -----------------                 ------------------                ------                       -------

  MemoryPressure   False   Sun, 09 Aug 2020 05:59:44 +0800   Sun, 09 Aug 2020 05:49:31 +0800   KubeletHasSufficientMemory   kubelet has sufficient memory available

  DiskPressure     False   Sun, 09 Aug 2020 05:59:44 +0800   Sun, 09 Aug 2020 05:49:31 +0800   KubeletHasNoDiskPressure     kubelet has no disk pressure

  PIDPressure      False   Sun, 09 Aug 2020 05:59:44 +0800   Sun, 09 Aug 2020 05:49:31 +0800   KubeletHasSufficientPID      kubelet has sufficient PID available

  Ready            False   Sun, 09 Aug 2020 05:59:44 +0800   Sun, 09 Aug 2020 05:49:31 +0800   KubeletNotReady              runtime network not ready: NetworkReady=f                                                                        alse reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized

Addresses:

  InternalIP:  192.168.1.151

  Hostname:    unica12master.localdomain

Capacity:

  cpu:                2

  ephemeral-storage:  49250820Ki

  hugepages-1Gi:      0

  hugepages-2Mi:      0

  memory:             3880732Ki

  pods:               110

Allocatable:

  cpu:                2

  ephemeral-storage:  45389555637

  hugepages-1Gi:      0

  hugepages-2Mi:      0

  memory:             3778332Ki

  pods:               110

System Info:

  Machine ID:                 44cfb44606f9476bb54c62a10588dcd1

  System UUID:                A6554D56-C05F-515D-BD13-8D20A4DEAEF1

  Boot ID:                    033a9b2d-82eb-483c-a603-edec28fc35ac

  Kernel Version:             3.10.0-957.el7.x86_64

  OS Image:                   Red Hat Enterprise Linux

  Operating System:           linux

  Architecture:               amd64

  Container Runtime Version:  docker://1.13.1

  Kubelet Version:            v1.18.6

  Kube-Proxy Version:         v1.18.6

Non-terminated Pods:          (5 in total)

  Namespace                   Name                                                 CPU Requests  CPU Limits  Memory Requests  Memory Limits  AGE

  ---------                   ----                                                 ------------  ----------  ---------------  -------------  ---

  kube-system                 etcd-unica12master.localdomain                       0 (0%)        0 (0%)      0 (0%)           0 (0%)         10m

  kube-system                 kube-apiserver-unica12master.localdomain             250m (12%)    0 (0%)      0 (0%)           0 (0%)         10m

  kube-system                 kube-controller-manager-unica12master.localdomain    200m (10%)    0 (0%)      0 (0%)           0 (0%)         10m

  kube-system                 kube-proxy-bgb9q                                     0 (0%)        0 (0%)      0 (0%)           0 (0%)         10m

  kube-system                 kube-scheduler-unica12master.localdomain             100m (5%)     0 (0%)      0 (0%)           0 (0%)         10m

Allocated resources:

  (Total limits may be over 100 percent, i.e., overcommitted.)

  Resource           Requests    Limits

  --------           --------    ------

  cpu                550m (27%)  0 (0%)

  memory             0 (0%)      0 (0%)

  ephemeral-storage  0 (0%)      0 (0%)

  hugepages-1Gi      0 (0%)      0 (0%)

  hugepages-2Mi      0 (0%)      0 (0%)

Events:

  Type    Reason                   Age                From                                   Message

  ----    ------                   ----               ----                                   -------

  Normal  NodeHasSufficientMemory  10m (x4 over 10m)  kubelet, unica12master.localdomain     Node unica12master.localdomain status is now: NodeHasSufficientMemory

  Normal  NodeHasNoDiskPressure    10m (x4 over 10m)  kubelet, unica12master.localdomain     Node unica12master.localdomain status is now: NodeHasNoDiskPressure

  Normal  NodeHasSufficientPID     10m (x4 over 10m)  kubelet, unica12master.localdomain     Node unica12master.localdomain status is now: NodeHasSufficientPID

  Normal  Starting                 10m                kubelet, unica12master.localdomain     Starting kubelet.

  Normal  NodeAllocatableEnforced  10m                kubelet, unica12master.localdomain     Updated Node Allocatable limit across pods

  Normal  NodeHasSufficientMemory  10m                kubelet, unica12master.localdomain     Node unica12master.localdomain status is now: NodeHasSufficientMemory

  Normal  NodeHasNoDiskPressure    10m                kubelet, unica12master.localdomain     Node unica12master.localdomain status is now: NodeHasNoDiskPressure

  Normal  NodeHasSufficientPID     10m                kubelet, unica12master.localdomain     Node unica12master.localdomain status is now: NodeHasSufficientPID

  Normal  Starting                 10m                kube-proxy, unica12master.localdomain  Starting kube-proxy.

Name:               unica12node1.localdomain

Roles:              <none>

Labels:             beta.kubernetes.io/arch=amd64

                    beta.kubernetes.io/os=linux

                    kubernetes.io/arch=amd64

                    kubernetes.io/hostname=unica12node1.localdomain

                    kubernetes.io/os=linux

Annotations:        kubeadm.alpha.kubernetes.io/cri-socket: /var/run/dockershim.sock

                    node.alpha.kubernetes.io/ttl: 0

                    volumes.kubernetes.io/controller-managed-attach-detach: true

CreationTimestamp:  Sun, 09 Aug 2020 05:50:13 +0800

Taints:             node.kubernetes.io/not-ready:NoSchedule

Unschedulable:      false

Lease:

  HolderIdentity:  unica12node1.localdomain

  AcquireTime:     <unset>

  RenewTime:       Sun, 09 Aug 2020 05:59:53 +0800

Conditions:

  Type             Status  LastHeartbeatTime                 LastTransitionTime                Reason                       Message

  ----             ------  -----------------                 ------------------                ------                       -------

  MemoryPressure   False   Sun, 09 Aug 2020 05:55:43 +0800   Sun, 09 Aug 2020 05:50:13 +0800   KubeletHasSufficientMemory   kubelet has sufficient memory available

  DiskPressure     False   Sun, 09 Aug 2020 05:55:43 +0800   Sun, 09 Aug 2020 05:50:13 +0800   KubeletHasNoDiskPressure     kubelet has no disk pressure

  PIDPressure      False   Sun, 09 Aug 2020 05:55:43 +0800   Sun, 09 Aug 2020 05:50:13 +0800   KubeletHasSufficientPID      kubelet has sufficient PID available

  Ready            False   Sun, 09 Aug 2020 05:55:43 +0800   Sun, 09 Aug 2020 05:50:13 +0800   KubeletNotReady              runtime network not ready: NetworkReady=f                                                                        alse reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized

Addresses:

  InternalIP:  192.168.1.152

  Hostname:    unica12node1.localdomain

Capacity:

  cpu:                6

  ephemeral-storage:  49250820Ki

  hugepages-1Gi:      0

  hugepages-2Mi:      0

  memory:             16266432Ki

  pods:               110

Allocatable:

  cpu:                6

  ephemeral-storage:  45389555637

  hugepages-1Gi:      0

  hugepages-2Mi:      0

  memory:             16164032Ki

  pods:               110

System Info:

  Machine ID:                 81ea4d0c7f724822b21c1dc2f071bf77

  System UUID:                35FE4D56-2DF2-1860-9B73-16F895B11091

  Boot ID:                    a90cd1a4-44de-4ef4-96c0-19ef9fbf8cd1

  Kernel Version:             3.10.0-957.el7.x86_64

  OS Image:                   Red Hat Enterprise Linux

  Operating System:           linux

  Architecture:               amd64

  Container Runtime Version:  docker://1.13.1

  Kubelet Version:            v1.18.6

  Kube-Proxy Version:         v1.18.6

Non-terminated Pods:          (1 in total)

  Namespace                   Name                CPU Requests  CPU Limits  Memory Requests  Memory Limits  AGE

  ---------                   ----                ------------  ----------  ---------------  -------------  ---

  kube-system                 kube-proxy-snxhr    0 (0%)        0 (0%)      0 (0%)           0 (0%)         9m50s

Allocated resources:

  (Total limits may be over 100 percent, i.e., overcommitted.)

  Resource           Requests  Limits

  --------           --------  ------

  cpu                0 (0%)    0 (0%)

  memory             0 (0%)    0 (0%)

  ephemeral-storage  0 (0%)    0 (0%)

  hugepages-1Gi      0 (0%)    0 (0%)

  hugepages-2Mi      0 (0%)    0 (0%)

Events:

  Type    Reason                   Age                    From                                  Message

  ----    ------                   ----                   ----                                  -------

  Normal  Starting                 9m50s                  kubelet, unica12node1.localdomain     Starting kubelet.

  Normal  NodeHasSufficientMemory  9m50s (x2 over 9m50s)  kubelet, unica12node1.localdomain     Node unica12node1.localdomain status is now: NodeHasSufficientMemory

  Normal  NodeHasNoDiskPressure    9m50s (x2 over 9m50s)  kubelet, unica12node1.localdomain     Node unica12node1.localdomain status is now: NodeHasNoDiskPressure

  Normal  NodeHasSufficientPID     9m50s (x2 over 9m50s)  kubelet, unica12node1.localdomain     Node unica12node1.localdomain status is now: NodeHasSufficientPID

  Normal  NodeAllocatableEnforced  9m50s                  kubelet, unica12node1.localdomain     Updated Node Allocatable limit across pods

  Normal  Starting                 9m39s                  kube-proxy, unica12node1.localdomain  Starting kube-proxy.

Name:               unica12node2.localdomain

Roles:              <none>

Labels:             beta.kubernetes.io/arch=amd64

                    beta.kubernetes.io/os=linux

                    kubernetes.io/arch=amd64

                    kubernetes.io/hostname=unica12node2.localdomain

                    kubernetes.io/os=linux

Annotations:        kubeadm.alpha.kubernetes.io/cri-socket: /var/run/dockershim.sock

                    node.alpha.kubernetes.io/ttl: 0

                    volumes.kubernetes.io/controller-managed-attach-detach: true

CreationTimestamp:  Sun, 09 Aug 2020 05:50:29 +0800

Taints:             node.kubernetes.io/not-ready:NoSchedule

Unschedulable:      false

Lease:

  HolderIdentity:  unica12node2.localdomain

  AcquireTime:     <unset>

  RenewTime:       Sun, 09 Aug 2020 05:59:59 +0800

Conditions:

  Type             Status  LastHeartbeatTime                 LastTransitionTime                Reason                       Message

  ----             ------  -----------------                 ------------------                ------                       -------

  MemoryPressure   False   Sun, 09 Aug 2020 05:55:59 +0800   Sun, 09 Aug 2020 05:50:29 +0800   KubeletHasSufficientMemory   kubelet has sufficient memory available

  DiskPressure     False   Sun, 09 Aug 2020 05:55:59 +0800   Sun, 09 Aug 2020 05:50:29 +0800   KubeletHasNoDiskPressure     kubelet has no disk pressure

  PIDPressure      False   Sun, 09 Aug 2020 05:55:59 +0800   Sun, 09 Aug 2020 05:50:29 +0800   KubeletHasSufficientPID      kubelet has sufficient PID available

  Ready            False   Sun, 09 Aug 2020 05:55:59 +0800   Sun, 09 Aug 2020 05:50:29 +0800   KubeletNotReady              runtime network not ready: NetworkReady=f                                                                        alse reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized

Addresses:

  InternalIP:  192.168.1.153

  Hostname:    unica12node2.localdomain

Capacity:

  cpu:                6

  ephemeral-storage:  49250820Ki

  hugepages-1Gi:      0

  hugepages-2Mi:      0

  memory:             16266432Ki

  pods:               110

Allocatable:

  cpu:                6

  ephemeral-storage:  45389555637

  hugepages-1Gi:      0

  hugepages-2Mi:      0

  memory:             16164032Ki

  pods:               110

System Info:

  Machine ID:                 2776e487ba884dc8b59c196d17b1354b

  System UUID:                CCB04D56-2D23-EF34-CC74-BD921B461E06

  Boot ID:                    06a85a26-dc33-447f-894d-4eccbac0be5e

  Kernel Version:             3.10.0-957.el7.x86_64

  OS Image:                   Red Hat Enterprise Linux

  Operating System:           linux

  Architecture:               amd64

  Container Runtime Version:  docker://1.13.1

  Kubelet Version:            v1.18.6

  Kube-Proxy Version:         v1.18.6

Non-terminated Pods:          (1 in total)

  Namespace                   Name                CPU Requests  CPU Limits  Memory Requests  Memory Limits  AGE

  ---------                   ----                ------------  ----------  ---------------  -------------  ---

  kube-system                 kube-proxy-hj582    0 (0%)        0 (0%)      0 (0%)           0 (0%)         9m34s

Allocated resources:

  (Total limits may be over 100 percent, i.e., overcommitted.)

  Resource           Requests  Limits

  --------           --------  ------

  cpu                0 (0%)    0 (0%)

  memory             0 (0%)    0 (0%)

  ephemeral-storage  0 (0%)    0 (0%)

  hugepages-1Gi      0 (0%)    0 (0%)

  hugepages-2Mi      0 (0%)    0 (0%)

Events:

  Type    Reason                   Age                    From                                  Message

  ----    ------                   ----                   ----                                  -------

  Normal  Starting                 9m34s                  kubelet, unica12node2.localdomain     Starting kubelet.

  Normal  NodeHasSufficientMemory  9m34s (x2 over 9m34s)  kubelet, unica12node2.localdomain     Node unica12node2.localdomain status is now: NodeHasSufficientMemory

  Normal  NodeHasNoDiskPressure    9m34s (x2 over 9m34s)  kubelet, unica12node2.localdomain     Node unica12node2.localdomain status is now: NodeHasNoDiskPressure

  Normal  NodeHasSufficientPID     9m34s (x2 over 9m34s)  kubelet, unica12node2.localdomain     Node unica12node2.localdomain status is now: NodeHasSufficientPID

  Normal  NodeAllocatableEnforced  9m34s                  kubelet, unica12node2.localdomain     Updated Node Allocatable limit across pods

  Normal  Starting                 9m23s                  kube-proxy, unica12node2.localdomain  Starting kube-proxy.

Download Cloudera Quickstart VMs

Apparently you can't download these anymore but someone found this:

https://www.cloudera.com/downloads/quickstart_vms/5-13/config.html

And here are the links:-)

Dropdown Title: Select a Platform

Dropdown Type: downloadType

Option Title: Virtual Box

Option Value: vb

Download Location: https://downloads.cloudera.com/demo_vm/virtualbox/cloudera-quickstart-vm-5.13.0-0-virtualbox.zip

Download Type: asset

Option Title: VMWare

Option Value: vmw

Download Location: https://downloads.cloudera.com/demo_vm/vmware/cloudera-quickstart-vm-5.13.0-0-vmware.zip

Download Type: asset

Option Title: KVM

Option Value: kvm

Download Location: https://downloads.cloudera.com/demo_vm/kvm/cloudera-quickstart-vm-5.13.0-0-kvm.zip

Download Type: asset

Option Title: Docker Image

Option Value: docker

Download Location: https://downloads.cloudera.com/demo_vm/docker/cloudera-quickstart-vm-5.13.0-0-beta-docker.tar.gz

Download Type: asset

For information on how to run them:

https://docs.cloudera.com/documentation/enterprise/5-13-x/topics/cloudera_quickstart_vm.html#xd_583c10bfdbd326ba-3ca24a24-13d80143249--7f9d__section_d3z_wtv_ls