myhistory.txt

kubectl get pods -A -o wide
k -n project-hamster create sa processor
k create ns processor
k delete ns processor
k create ns project-hamster
k -n project-hamster create sa processor
k -n project-hamster create role processor --verb=create --resource=secret --resource=configmap
k get role processor -n project-hamster
k get role processor -n project-hamster -o yaml
k -n project-hamster create rolebinding processor --role processor --serviceaccount project-hamster:processor
k get rolebinding processor -n project-hamster -o yaml
k auth can-i -h
k -n project-hamster auth can-i create secret --as system:serviceaccount:project-hamster:processor
k -n project-hamster auth can-i create configmap --as system:serviceaccount:project-hamster:processor
k -n project-hamster auth can-i create pod --as system:serviceaccount:project-hamster:processor
k -n project-hamster auth can-i delete secret --as system:serviceaccount:project-hamster:processor
k -n project-hamster auth can-i get configmap --as system:serviceaccount:project-hamster:processor
k create ns project-tiger
k -n project-tiger create deployment --image=httpd:2.4-alpine ds-important $do > 11.yaml
k apply -f 11.yaml  --dry-run=client
k apply -f 11.yaml  
k get ds -n project-tiger
k get pods -n project-tiger
k get pods -n project-tiger -o wide
cp 11.yaml 12.yaml
vim 12.yaml 
k apply -f 12.yaml  --dry-run=client
k apply -f 12.yaml  
k get pods -n project-tiger -o wide
k get deploy -n project-tiger
k describe pod deploy-important-78fd99d786-skwzl -n project-tiger
k get ns
k delete ns project-tiger $now
k delete ns project-hamster $now
k get ns
kubectl run multi-container-playground --image=nginx:1.17.6-alpine $do > 13.yaml
vim 13.yaml 
k apply -f 13.yaml $do
k apply -f 13.yaml
k get pods
k describe pod multi-container-playground
k get pods
vim 13.yaml 
k apply -f 13.yaml --force
k describe pod multi-container-playground
k get pods
k exec multi-container-playground -c c1 -- env | grep MY
k logs multi-container-playground -c c3
k delete -f 13.yaml --force $now
k get pods
k get nodes
sudo mkdir -p /opt/course/14/
vim /opt/course/14/cluster-info
sudo vim /opt/course/14/cluster-info
k get nodes -o wide
k get services -o wide
sudo vim /opt/course/14/cluster-info
sudo cat /etc/kubernetes/manifests/kube-apiserver.yaml | grep range
sudo find /etc/cni/net.d/
sudo cat /etc/cni/net.d/10-weave.conflist
sudo vim /opt/course/14/cluster-info
sudo mkdir -p /opt/course/15/
echo kubectl get events -A --sort-by=.metadata.creationTimestamp | sudo tee /opt/course/15/cluster_events.sh
sudo cat /opt/course/15/cluster_events.sh
k -n kube-system get pod -o wide | grep proxy
kubectl delete pod kube-proxy-kxzbh -n kube-system $now
k -n kube-system get pod -o wide | grep proxy
sudo chmod +x /opt/course/15/cluster_events.sh
sudo cat /opt/course/15/cluster_events.sh
kubectl get events -A --sort-by=.metadata.creationTimestamp
sh /opt/course/15/cluster_events.sh
sudo vim /opt/course/15/pod_kill.log
sh /opt/course/15/cluster_events.sh
sudo mkdir -p /opt/course/16
k api-resources
k api-resources -h
k api-resources --namespaced=true
k api-resources --namespaced=true -o name
k api-resources --namespaced=true
sudo k api-resources --namespaced -o name > /opt/course/16/resources.txt
k api-resources --namespaced -o name | sudo tee /opt/course/16/resources.txt
sudo cat /opt/course/16/resources.txt
k api-resources -h
k get role --no-headers | wc -l
k get role --no-headers -n kube-system | wc -l
k get role --no-headers -n default | wc -l
sudo vim /opt/course/16/crowded-namespace.txt
k get role --no-headers -A | wc -l
k get role --no-headers -A
kubectl create ns project-tiger
k run tigers-reunite --image=httpd:2.4.41-alpine -n project-tiger $do > 17.yaml
vim 17.yaml 
k apply -f 17.yaml 
k get pods -n project-tiger
k get pods -n project-tiger -o wide
sudo mkdir /opt/course/17
sudo vim /opt/course/17/pod-container.txt
sudo chmod -R +x /opt/course/*/*.sh
kubectl run secret-pod --image=busybox:1.31.1 -n secret $do > 19.yaml
vim 19.yaml 
k -n secret create secret generic secret2 --from-literal=user=user1 --from-literal=pass=1234
kubeadm version
kubectl version
kubelet --version
sudo cp 19.yaml /etc/kubernetes/manifests/
k get pods -A
sudo rm /etc/kubernetes/manifests/19.yaml
k get pods -A
sudo ls /etc/kubernetes/pki/
sudo find /etc/kubernetes/pki/ | grep apiserver
sudo openssl x509 -noout -text -in /etc/kubernetes/pki/apiserver.crt | grep Validity -A2
sudo kubeadm certs check-expiration | grep apiserver
sudo openssl x509 -noout -text -in /var/lib/kubelet/pki/kubelet-client-current.pem | grep Issuer
sudo openssl x509 -noout -text -in /var/lib/kubelet/pki/kubelet-client-current.pem | grep "Extended Key Usage" -A1
sudo openssl x509 -noout -text -in /var/lib/kubelet/pki/kubelet.crt | grep Issuer
sudo openssl x509 -noout -text -in /var/lib/kubelet/pki/kubelet.crt | grep "Extended Key Usage" -A1
sudo cat /etc/kubernetes/manifests/kube-apiserver.yaml | grep etcd

sudo ETCDCTL_API=3 etcdctl snapshot save /tmp/etcd-backup.db --cacert /etc/kubernetes/pki/etcd/ca.crt --cert /etc/kubernetes/pki/apiserver-etcd-client.crt --key /etc/kubernetes/pki/apiserver-etcd-client.key
sudo cat /tmp/etcd-backup.db 
sudo ETCDCTL_API=3 etcdctl snapshot restore /tmp/etcd-backup.db --data-dir /var/lib/etcd-backup --cacert /etc/kubernetes/pki/etcd/ca.crt --cert /etc/kubernetes/pki/apiserver-etcd-client.crt --key /etc/kubernetes/pki/apiserver-etcd-client.key

sudo ETCDCTL_API=3 etcdctl snapshot save /tmp/etcd-backup.db --cacert /etc/kubernetes/pki/etcd/ca.crt --cert /etc/kubernetes/pki/etcd/server.crt --key /etc/kubernetes/pki/etcd/server.key
sudo cat /tmp/etcd-backup.db 
sudo ETCDCTL_API=3 etcdctl snapshot restore /tmp/etcd-backup.db --data-dir /var/lib/etcd-backup --cacert /etc/kubernetes/pki/etcd/ca.crt --cacert /etc/kubernetes/pki/etcd/ca.crt --cert /etc/kubernetes/pki/etcd/server.crt --key /etc/kubernetes/pki/etcd/server.key

sudo tree /var/lib/etcd-backup
k run test --image=nginx 
k get pods -A | grep test
cd /etc/kubernetes/manifests/
sudo mkdir ../test
sudo mv *.yaml ../test/
k get pods
sudo vim ../test/etcd.yaml 
sudo mv ../test/*.yaml .
k get pods -A | grep test
sudo vim etcd.yaml 
sudo mv *.yaml ../test
sudo mv ../test/*.yaml .
k get pods -A | grep test
k delete pod test $now
k get pods -A -o jsonpath="{range .items[*]} {.metadata.name}{.spec.containers[*].resources}{'\n'}"
k get pods -A -o jsonpath="{range .items[*]}{.metadata.name} {.status.qosClass}{'\n'}"
sudo crictl ps | grep scheduler
k run busybox --image=busybox --command $do -- /bin/sh -c 'echo hello;sleep 3600' > pod.yaml