Openshift

What does it mean?

csi                   Container Storage Interface
cri                   Container Runtime Interface
ocp                   OpenShift Container Platform
uWSGI                 Project aims at developing a full stack for building hosting services.
ipi                   Installer-Provisioned Infrastructure
upi                   User-Provisioned Infrastructure

login

oc login --username developerhttps://openshift:6443

switch user

oc login --username developer

which clusters have you logged into

oc config get-clusters

List projects

oc projects
oc get projects

select project

oc project $project

list pods

oc get pods
oc get pods --all-namespaces
oc get pods -o wide

wide will give you on which node pod is running.

oc get pods -o wide --all-namespaces

get services

oc get svc

get shell on node

oc debug node/infra-2.ocpdev.lkl.ltkalmar.se

Get working env

chroot /host

get nodes

oc get nodes

connect to pod

oc rsh $pod bash

when several pods

oc get pod/router-default-6b76b87c6-5m7h6 -n openshift-ingress -o json | jq -r '.spec.containers[].name'
router
logs
[2021-05-17 15:41:51 user@host:~]
oc rsh -c router pod/router-default-6b76b87c6-5m7h6

execute command in pod

oc exec pod/router-default-545ffb97db-4h9rx -- $command

describe pods

oc describe pods
oc describe pod stage-sales-62-qjd

To get (almost) all object with a specific label from the current project, execute:

oc get all -l '<label_name>=<label_value>'

logs

oc logs -f router-default-6b76b87c6-4lc4b logs > /tmp/tmp

get config from pod in yaml format

oc get pods router-default-545ffb97db-kgsdb -o yaml

get deployments

oc get deployment

set environment variable in pod

oc set env dc/your-app-name COLOR=blue

unset environment variable in pod

oc set env dc/your-app-name COLOR-

list environment variables

oc set env pod/router-default-545ffb97db-lj2t5 --list

list templates

oc get templates -n openshift

Custom resource definitions.(crd)

oc get crd

sort

CREATED AT

oc get crd --sort-by=.metadata.creationTimestamp

edit

oc edit deployment.apps/router-default

Watch changes taking place.

watch -n1 oc get all

grant permission to project

oc adm policy add-role-to-user view developer -n mysecrets

crictl

List running containers

crictl ps

List all pods

crictl pods

List all images

crictl images

Execute a command in a running container

crictl exec -it 1f73f2d81bf98 /bin/sh

nsenter

run program in different namespaces

which version

oc version

copy files from pod

Copy session keys locally.

oc rsync caas-2-8s6cl:/tmp/sslkeylog .

tcpdump from nodes

ssh $node
toolbox

oc get route -A

get routing.

oc describe route sales -n hlt-prod

Name:                   sales
Namespace:              hlt-prod
Created:                13 months ago
Labels:                 <none>
Annotations:            haproxy.router.openshift.io/balance=roundrobin
                        haproxy.router.openshift.io/disable_cookies=true
Requested Host:         sales.prod.bobcat.hlt.se
                           exposed on router default (host apps.ocpprod.lkl.ltkalmar.se) 13 months ago
Path:                   <none>
TLS Termination:        edge
Insecure Policy:        <none>
Endpoint Port:          port-8000-tcp

Service:        sales
Weight:         100 (100%)
Endpoints:      10.160.7.166:8000, 10.160.7.167:8000, 10.160.7.168:8000 + 35 more...

oc get pods -o custom-columns=POD:.metadata.name --no-headers --all-namespaces

Only name without headers

get label:s

oc get pods --no-headers --all-namespaces|grep -i running | head -2 | while read  namespace pod blabla ; do echo '***' oc label pod/$pod --list=true -n $namespace ; oc label pod/$pod --list=true -n $namespace ; done

get subscriptions

oc get subscriptions -A

oc whoami

who am i

oc explain pv

oc explain pv

put node offline

Mark a node as unschedulable.

oc adm cordon node1

Drain a node in preparation for maintenance.

oc adm drain node1 --force --delete-emptydir-data --ignore-daemonsets

Mark node as online.

oc adm uncordon node1