1. Node Cheat Sheet
2. Node Stream Cheat Sheet
3. Knime Node Cheat Sheet

• PDF Link: cheatsheet-openshift-A4.pdf, Category: Cloud
• Blog URL: https://cheatsheet.dennyzhang.com/cheatsheet-openshift-A4
• Related posts: PKS CheatSheet, Kubectl CheatSheet, #denny-cheatsheets

This will cause node to exit and generate a core file. Chdir ( dir ); // Changes the current working directory of the process or throws an exception if that fails. Cwd ( ); // Returns the current working directory of the process. Server-sideio.on('connection', (socket) = // basic emit socket.emit(/./); // to all clients in the current namespace except the sender socket.broadcast.emit. OverAPI.com is a site collecting all the cheatsheets,all!

File me Issues or star this repo.

1.1 OpenShift FAQ

Name	Summary
Kubernetes versions for different OpenShift versions	openshift 3.9, openshift 3.10, openshift 3.11

1.2 OpenShift Key Components

Name	Command
Computing virtualization	RHV (Red Hat Virtualization), based on KVM
SDN networking	Based upon OVS
VM/Cluster lifecycle management	CloudForms ?
Node healing	Notification of failed components but no recovery
Container optimized OS
Container Image Compliance Scan	CloudForms OpenSCAP, like Harbor Clair
Container runtime	dockerd, cri-o
Container image registry	OpenShift Container Registry (OCR), powered by Redhat Quay
Packages k8s cluster orchestrator	tectonic ?
Component Packaging	Ansible modules?
CSI for Persistent volume	GlusterFS, NFS, Local storage
Authorization	OpenShift Container Platform policy engine
Disater Recovery	Notification of failed components but no recovery
Control Plane
Reference	Link: OpenShift Container Platform Cluster Limits
Reference	Link: OpenShift Key Components, Link: PKS Key Components

1.3 New Concepts From OpenShift

Name	Command
BuildConfig
Source2Image(s2i)
Templates	Like helm chart
Pipelines	Jenkins
Fine grained security policies OOTB	Like k8s psp
Security Context Contraints(SCC)
Red Hat Container Catalog (RHCC)
Route	Like k8s ingress
Metering and Chargeback
Operator SDK

1.4 OpenShift Solutions

Name	Command
OpenShift Online	Hosted by Red Hat in AWS public cloud
OpenShift Dedicated	Virtual private cloud, managed by Red Hat in any AWS region
OpenShift Container Platform	Any on-premise, public, or private cloud infra with RedHat Enterprise Linux
OKD
Minishift
Reference	Link: OpenShift plans and pricing

1.5 OpenShift Glossary

Name	Command
OKD	The Origin Community Distribution of Kubernetes that powers Red Hat OpenShift.
oc command line	OpenShift command line: oc <action> <object_type> <object_name_or_id>
Project	Namespace in Kubernetes. Resources are aggregated by projects. oc get project
Build	Builds create a new image from source code, other images, Dockerfiles, etc. oc get build
Build Configuration	How to build source code and a base image into a new image. oc get bc
Route	Endpoint in Kubernetes. A route is an external DNS entry
Deployment Configuration	oc get dc
ImageStream	oc get is
ImageStreamTag	oc get istag
ImageStreamImage	oc get isimage
Template	oc get template
Template Instance	oc get templateinstance
Explain	Online manual oc explain pod
Red Hat Registry	By default, all images are pulled from registry.redhat.io.
OpenShift SaaS Version	https://openshift.io/
OpenShift online	https://cloud.openshift.com
Reference
Reference	OpenShift CheatSheet, Rancher CheatSheet, PKS CheatSheet

1.6 OpenShift Assumptions

Name	Summary
Single instance of K8S	One OpenShift One K8S. Use k8s namespace soly for multi-tenancy
No mixed versions	Versions must match between master and node hosts, excluding upgrade; Old oc can talk to new servers
Node roles	Master nodes, worker nodes, and etcd nodes.

1.7 OpenShift Maintainance

Name	Command
Install clusters	Run ansible playbooks to install OpenShift
Upgrade clusters	Support both in-place upgrade and blue-green deployments; Use ansible to upgrade clusters
Node problem healing

1.8 OpenShift Cfg Files

Name	Summary
The default image stream and template files	/usr/share/openshift/examples/, /etc/origin/examples/
Data folder for master and worker nodes	/var/lib
Volumes and potential core dumps of the binary	/var/lib/origin
Cloud provider specific conf(AWS, Azure, etc)	/etc/origin/cloudprovider
Additional third party volume plug-ins	/usr/libexec/kubernetes/kubelet-plugins, /etc/origin/kubelet-plugins
All certificates, conf files, admin.kubeconfig, etc	/etc/origin/master
Master node conf profile	/etc/origin/master/admin.kubeconfig
Used for node bootstrapping nodes other than master	/etc/origin/master/bootstrap.kubeconfig
Node conf profile	/etc/origin/node/node.kubeconfig, /etc/origin/node/node-config.yaml

1.9 OC – Highlights

Name	Command
Get api requests verbose output with kubectl call	oc --loglevel 999 get pod/dummy-deployment-6d6759c786-5kwth
Start a pod and get a shell for debug	oc debug dc/jorge
Impersonate for oc command	oc --as=jorge get pods, oc --as-group=developers get pods
Use oc to do admin operations	oc adm <sub-command>
Try experimental commands of oc	oc ex <sub-command>
Explain OpenShift/Kubernetes concepts to me	oc explain pod, oc explain replicaset
Enable oc shell autocompletion	echo 'source <(oc completion zsh)' >>~/.zshrc, then reload terminal
Reference	OpenShift CheatSheet, Kubectl CheatSheet

1.10 OC – Admin

Node Cheat Sheet

Name	Command
Login/logout	oc login, oc logout, oc whoami
List route	oc get route
List all object types	oc types, oc api-resources
Start a local OpenShift all-in-one cluster	oc cluster up

1.11 OC – Developer

Name	Command
Create a project	oc new-project <projectname> --description=<description> --display-name=<display_name>
Check status of current project	oc statusLink: OC CLI Operations
Show oc cli profile	oc config viewLink: Managing CLI Profiles
Get all resource	oc get all
Switch project	oc project <projectname>
Create an application	oc new-app https://github.com/sclorg/cakephp-ex
Create a new build	oc new-build https://github.com/sclorg/cakephp-ex
Manually start a build with given conf	oc start-build <buildconfig_name>
Stop a build that is in progress	oc cancel-build <build_name>
Import an external image	oc import-image <image_stream>
Tag an image	oc tag <current_image> <image_stream>

1.12 OpenShift Source Code

Name	Command
Openshift Ansible Deployment	GitHub: openshift-ansible/playbooks

1.13 OpenShift Opportunty

Name	Command
Doesn’t support multiple clusters
OC command line could be a strengh or a weakness
Lack of SDN solution
Time-consuming for administrators’ operations

Node Stream Cheat Sheet

Knime Node Cheat Sheet

1.16 More Resources

License: Code is licensed under MIT License.