CKA 2days July 23

student@control:~/cka$ history
    1  lscpu
    2  free -m
    3  df -h
    4  git clone https://github.com/sandervanvugt/cka
    5  cd cka
    6  ls
    7  ls *sh
    8  ./setup-container.sh
    9  ls *sh
   10  less setup-kubetools-specific-version.sh
   11  ./setup-kubetools-specific-version.sh
   12  sudo ./setup-kubetools-specific-version.sh
   13  history
   14  sudo kubeadm init
   15  vim setup-kubetools-specific-version.sh
   16  ./setup-kubetools-specific-version.sh
   17  sudo ./setup-kubetools-specific-version.sh
   18  sudo kubeadm -h
   19  sudo kubeadm reset
   20  sudo kubeadm init
   21  vim ./setup-kubetools-specific-version.sh
   22  sudo apt remove -y kubelet=1.24.3-00 kubeadm=1.24.3-00 kubectl=1.24.3-00
   23  sudo apt remove -y --allow-change-held-packages kubelet=1.24.3-00 kubeadm=1.24.3-00 kubectl=1.24.3-00
   24  sudo ./setup-kubetools-specific-version.sh
   25  sudo kubeadm init
   26  kubectl get pods -A
   27  less setup-kubetools.sh
   28  kubectl apply -f https://raw.githubusercontent.com/projectcalico/calico/v3.25.0/manifests/calico.yaml
   29  kubectl get pods -n kube-system
   30  kubectl apply -f https://raw.githubusercontent.com/projectcalico/calico/v3.25.0/manifests/calico.yaml
   31  kubectl get nodes
   32  history
   33  kubectl get nodes
   34  ./counter.sh 5
   35  history
   36  git pull
   37  cd ..
   38  rm -rf cka
   39  git clone https://github.com/sandervanvugt/cka
   40  cd cka
   41  cat cluster-setup.txt
   42  kubectl create ns mynamespace
   43  kubectl run task2pod --image=alpine -n mynamespace -- /bin/sh -c 'sleep 3600'
   44  kubectl get ns
   45  kubectl get pods -n mynamespace
   46  source <(kubectl completion bash)
   47  kubectl get pods -n mynamespace -o yaml
   48  kubectl run task2pod2 --image=alpine -n mynamespace -- sleep 3600
   49  kubectl get pods -n mynamespace task2pod2 -o yaml | less
   50  history
   51  vim co3.yaml
   52  vim jc3.yaml
   53  kubectl apply -f jc3.yaml
   54  kubectl get pods
   55  kubectl logs task3pod
   56  kubectl describe pod task3pod
   57  kubectl run dummy --image=busybox --dry-run -o yaml -- sleep 3600
   58  vim jc3.yaml
   59  kubectl delete pod task3pod
   60  kubectl apply -f jc3.yaml
   61  kubectl get pods
   62  history
   63  vim jc3.yaml
   64  kubectl create deployment nginx-ex5 --image=nginx --replicas=2
   65  kubectl get all
   66  kubectl scale deployment nginx-ex5 --replicas 4
   67  kubectl get all
   68  kubectl create ns limited
   69  kubectl create quota -h | less
   70  kubectl create quota --hard pods=3,cpu=100m,memory=500Mi -n limited
   71  kubectl create quota qtest --hard pods=3,cpu=100m,memory=500Mi -n limited
   72  kubectl describe quota -n limited
   73  kubectl describe ns limited
   74  kubectl create deployment nginx --image=nginx --replicas=3 -n limited
   75  kubectl get all -n limited
   76  kubectl get -n limited rs nginx-77b4fdf86c
   77  kubectl describe -n limited rs nginx-77b4fdf86c
   78  kubectl -n limited set resources -h
   79  kubectl -n limited set resources -h | less
   80  kubectl -n limited set resources deploy nginx --requests cpu=100m,memory=5Mi --limits cpu=200m,memory=20Mi
   81  kubectl get pods -n limited
   82  kubectl get all -n limited
   83  kubectl describe ns limited
   84  kubectl edit -n limited quota qtest
   85  kubectl get all -n limited
   86  kubectl scale deployment -n limited --replicas 4
   87  kubectl scale deployment nginx -n limited --replicas 4
   88  kubectl scale deployment nginx -n limited --replicas 3
   89  kubectl get all -n limited
   90  vim jh7.txt
   91  kubectl describe ns limited
   92  kubectl run testpod --image=nginx -n limited
   93  vim jh7.txt
   94  kubectl run testpod --image=busybox --dry-run=client -o yaml -n limited -- sleep 3600
   95  kubectl run testpod --image=busybox --dry-run=client -o yaml -n limited -- sleep 3600 > mycode.yaml
   96  kubectl get pods -n limited nginx-8647459fc7-pzlkt
   97  kubectl get pods -n limited nginx-8647459fc7-pzlkt -o yaml
   98  vim mycode.yaml
   99  kubectl apply -f mycode.yaml
  100  historey
  101  history
  102  vim jh7.txt
  103  vim nwpolicy-complete-example.yaml
  104  kubectl apply -f nwpolicy-complete-example.yaml
  105  kubectl expose pod nginx --port=80
  106  kubectl exec -it busybox -- wget --spider --timeout=1 nginx
  107  kubectl get pods --show-labels
  108  kubectl label pod busybox access=true
  109  kubectl exec -it busybox -- wget --spider --timeout=1 nginx
  110  kubectl get pods --show-labels
  111  kubectl create ns nwp-namespace
  112  vim nwp-lab9-1.yaml
  113  kubectl apply -f nwp-lab9-1.yaml
  114  kubectl expose pod nwp-nginx --port=80
  115  kubectl get svc
  116  kubectl exec -it nwp-busybox -n nwp-namespace -- wget --spider --timeout=1 nwp-nginx
  117  kubectl exec -it nwp-busybox -n nwp-namespace -- nslookup nwp-nginx
  118  kubectl get svc,pods -n kube-system
  119  kubectl exec -it nwp-busybox -n nwp-namespace -- nslookup nwp-nginx.default.svc.cluster.local
  120  kubectl get svc
  121  kubectl exec -it nwp-busybox -n nwp-namespace -- wget --spider --timeout=1 nwp-nginx.default.svc.cluster.local
  122  vim nwp-lab9-2.yaml
  123  kubectl apply -f nwp-lab9-2.yaml
  124  kubectl exec -it nwp-busybox -n nwp-namespace -- wget --spider --timeout=1 nwp-nginx.default.svc.cluster.local
  125  kubectl create deploy busybox --image=busybox -- sleep 3600
  126  kubectl exec -it busybox-c95495658-8jnj5 -- wget --spider --timeout=1 nwp-nginx
  127  kubectl default -f nwp-lab9-2.yaml
  128  kubectl delete -f nwp-lab9-2.yaml
  129  vim jh12.yaml
  130  kubectl apply -f jh12.yaml
  131  kubectl create ns restricted
  132  kubectl apply -f jh12.yaml
  133  kubectl delete -f jh12.yaml
  134  kubectl apply -f jh12.yaml
  135  vim jh12.yaml
  136  kubectl exec -it busybox -- wget --spider --timeout=1 nginx.restricted.svc.cluster.local
  137  kubectl get pods --show-labels
  138  kubectl exec -it busybox-c95495658-8jnj5 -- wget --spider --timeout=1 nginx.restricted.svc.cluster.local
  139  history
  140  ./counter.sh 5
  141  kubectl -h | less
  142  kubectl cordon -h | less
  143  kubectl drain -h | less
  144  kubectl drain worker2
  145  kubectl drain worker2 --ignore-daemonsets --force
  146  kubectl get pods -o wide
  147  kubectl get nodes
  148  kubectl edit worker2
  149  kubectl edit node worker2
  150  kubectl uncordon worker2
  151  kubectl get nodes
  152  kubectl edit node worker2
  153  kubectl get pods -A -o wide
  154  kubectl get ds -A
  155  kubectl get pods -o wide
  156  kubectl create newdep --image=nginx --replicas=5
  157  kubectl create deploy newdep --image=nginx --replicas=5
  158  kubectl get pods -o wide
  159  kubectl scale deploy nginx-ex5 --replicas=1
  160  kubectl scale deploy nginx-ex5 --replicas=4
  161  kubectl get pods -o wide
  162  kubectl label nodes worker2 disktype=ssd
  163  vim selector-pod.yaml
  164  kubectl cordon worker2
  165  kubectl apply -f selector-pod.yaml
  166  kubectl get pods -o wide
  167  kubectl describe pod nginx
  168  kubectl uncordon worker2
  169  kubectl get pods -o wide
  170  kubectl edit node control
  171  kubectl get pods -n kube-system -o wide
  172  kubectl edit -n kube-system pod coredns-5d78c9869d-
  173  kubectl edit -n kube-system pod coredns-5d78c9869d-2brbt
  174  kubectl taint nodes worker1 example-key=value1:NoSchedule
  175  kubectl describe node worker1
  176  kubectl describe node worker1 | less
  177  kubectl create deploy nginx-taint --image=nginx --replicas=5
  178  kubectl get pods -o wide
  179  kubectl delete deploy nginx-taint
  180  vim taint-toleration.yaml
  181  kubectl create -f taint-toleration.yaml
  182  kubectl get pods -o wide
  183  kubectl delete -f taint-toleration.yaml
  184  vim taint-toleration.yaml
  185  kubectl describe node worker1
  186  vim taint-toleration.yaml
  187  kubectl create -f taint-toleration.yaml
  188  history
  189  vim taint-toleration.yaml
  190  kubectl get nodes -o wide
  191  kubectl edit nodes worker1
  192  kubectl cordon worker2
  193  kubectl delete -f taint-toleration
  194  kubectl delete -f taint-toleration.yaml
  195  kubectl apply -f taint-toleration.yaml
  196  vim taint-toleration.yaml
  197  kubectl apply -f taint-toleration.yaml
  198  kubectl get pods -o wide
  199  kubectl run testpod --image=nginx
  200  kubectl get pods
  201  vim taint-toleration.yaml
  202  vim jc4.yaml
  203  kubectl apply -f jc4.yaml
  204  kubectl get pods
  205  kubectl describe pod task4pod
  206  kubectl uncordon worker2
  207  kubectl get pods
  208  kubectl describe pod task4pod
  209  cat jc4.yaml
  210  kubectl delete -f taint-toleration.yaml
  211  kubectl edit nodes control
  212  kubectl edit nodes worker1
  213  vim taint-toleration.yaml
  214  kubectl cordon worker2
  215  kubectl run taintdemo --image=nginx
  216  kubectl get pods
  217  kubectl apply -f taint-toleration.yaml
  218  kubectl get pods
  219  kubectl uncordon worker2
  220  kubectl get pods
  221  history
  222  kubectl edit node control
  223  kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/download/latest/components.yaml
  224  kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml
  225  kubectl -n kube-system get pods
  226  kubectl -n kube-system logs metrics-server-7b4c4d4bfd-kdkfj
  227  kubectl edit deployments.apps -n kube-system metrics-server
  228  kubectl -n kube-system get pods
  229  kubectl top pods -A
  230  history
  231  kubectl create newdb --image=mariadb
  232  kubectl run newdb --image=mariadb
  233  kubectl get pods newdb
  234  kubectl describe pod newdb
  235  kubectl get pods newdb
  236  kubectl logs newdb
  237  vim /tmp/mariadb-error.txt
  238  history
  239  cd
  240  ls
  241  tar xvf helm-v3.12.1-linux-amd64.tar.gz
  242  sudo cp linux-amd64/helm /usr/local/bin/
  243  helm --version
  244  helm version
  245  helm upgrade --install ingress-nginx ingress-nginx --repo https://kubernetes.github.io/ingress-nginx --namespace ingress-nginx --create-namespae
  246  helm upgrade --install ingress-nginx ingress-nginx --repo https://kubernetes.github.io/ingress-nginx --namespace ingress-nginx --create-namespace
  247  kubectl get pods -n ingress-nginx
  248  kubectl get pods -n ingress-nginx -o wide
  249  kubectl create deploy nginxsvc --image=nginx --port=80
  250  kubectl expose deploy nginxsvc
  251  kubectl get svc
  252  kubectl describe svc nginxsvc
  253  kubectl scale deployment nginxsvc --replicas 3
  254  kubectl describe svc nginxsvc
  255  kubectl create ing nginxsvc --class=nginx --rule=nginxsvc.info/*=nginxsvc:80
  256  kubectl describe ing nginxsvc
  257  sudo vim /etc/hosts
  258  kubectl port-forward -n ingress-nginx svc/ingress-nginx-controller 8080:80
  259  bg
  260  curl nginxsvc.info:8080
  261  kubectl get all -n ingress-nginx
  262  kubectl edit svc nginxsvc
  263  kubectl describe ing nginxsvc
  264  kubectl describe svc nginxsvc
  265  kubectl edit svc nginxsvc
  266  kubectl describe ing nginxsvc
  267  history
  268  sudo apt install etcd-client
  269  sudo etcdctl --help
  270  sudo ETCDCTL_API=3 etcdctl --help
  271  ps aux | grep etcd
  272  sudo ls /etc/kubernetes/pki/
  273  sudo ls /etc/kubernetes/pki/etcd/
  274  sudo ETCDCTL_API=3 etcdctl --endpoints=localhost:2379 --cacert /etc/kubernetes/pki/etcd/ca.crt --cert /etc/kubernetes/pki/etcd/server.crt --key /etc/kubernetes/pki/etcd/server.key get / --prefix --keys-only
  275  sudo ETCDCTL_API=3 etcdctl --endpoints=localhost:2379 --cacert /etc/kubernetes/pki/etcd/ca.crt --cert /etc/kubernetes/pki/etcd/server.crt --key /etc/kubernetes/pki/etcd/server.key snapshot save /tmp/etcdbackup.db
  276  sudo ETCDCTL_API=3 etdctl --write-out=table snapshot status /tmp/etcdbackup.db
  277  sudo ETCDCTL_API=3 etcdctl --write-out=table snapshot status /tmp/etcdbackup.db
  278  cp /tmp/etcdbackup.db /tmp/etcdbackup.db.2
  279  history
  280  kubectl delete --all deploy
  281  cd /etc/kubernetes/manifests/
  282  ls
  283  sudo crictl ps
  284  sudo mv * ..
  285  sudo crictl ps
  286  sudo ETCDCTL_API=3 etcdctl snapshot restore /tmp/etcdbackup.db --data-dir /var/lib/etcd-backup
  287  sudo ls -l /var/lib/etcd-backup/
  288  sudo vi /etc/kubernetes/etcd.yaml
  289  sudo mv ../*.yaml .
  290  sudo crictl ps
  291  kubectl get deploy -A
  292  cd
  293  cd cka
  294  history
  295  vim resize_pvc.yaml
  296  kubectl get pods -n kube-system
  297  kubectl get pods -n kube-system calico-node-zrrqg -o yaml | less
  298  kubectl get roles -n kube-system
  299  kubectl get rolebindings -n kube-system
  300  kubectl get clusterrolebindings
  301  kubectl get clusterrolebindings | grep -i calico
  302  kubectl get clusterrolebindings.rbac.authorization.k8s.io calico-node -o yaml | less
  303  kubectl get clusterroles.rbac.authorization.k8s.io calico-node -o yaml | less
  304  kubectl create sa --help | less
  305  kubectl create role --help | less
  306  kubectl create rolebinding --help | less
  307  kubectl set --help
  308  kubectl set serviceaccount --help | less
  309  history
  310  kubectl create role viewers --help | less
  311  kubectl create ns roles; kubectl create role viewers --verb=get --verb=list --verb=watch --resource=pods -n roles
  312  kubectl create sa -n roles viewers
  313  kubectl create rolebinding --help
  314  kubectl create rolebinding --help | less
  315  history
  316  #kubectl create rolebinding admin-binding --role=admin --serviceaccount=monitoring:sa-dev
  317  kubectl create rolebinding viewers-binding -n roles --role=viewers --serviceaccount=viewers
  318  kubectl create rolebinding viewers-binding -n roles --role=viewers --serviceaccount=roles:viewers
  319  kubectl run viewpod --image=nginx --dry-run=client -o yaml > viewpod.yaml
  320  vim viewpod.yaml
  321  kubectl apply -f viewpod.yaml
  322  kubectl get -n roles pods -o yaml
  323  history
  324  kubectl get nodes
  325  kubectl describe node worker2
  326  sudo apt update
  327  sudo apt-cache madison kubeadm
  328  sudo apt-mark unhold kubeadm && sudo apt-get update && sudo apt-get install -y kubeadm=1.27.3-00 && sudo apt-mark hold kubeadm
  329  sudo kubeadm version
  330  sudo kubeadm upgrade plan
  331  sudo kubeadm upgrade apply v1.27.3
  332  kubectl drain control --ignore-daemonsets --force
  333  kubectl get pods
  334  cd /etc/kubernetes/manifests/
  335  ls
  336  sudo cp * ..
  337  #sudo apt-mark unhold kubelet kubectl && \
  338  sudo apt-get update && sudo apt-get install -y kubelet=1.27.3-00 kubectl=1.27.3-00 && sudo apt-mark hold kubelet kubectl
  339  mv * ..
  340  sudo mv * ..
  341  sudo apt-get update && sudo apt-get install -y kubelet=1.27.3-00 kubectl=1.27.3-00 && sudo apt-mark hold kubelet kubectl
  342  sudo systemctl daemon-reload
  343  sudo systemctl restart kubelet
  344  sudo mv ../*.yaml .
  345  kubectl get nodes
  346  kubectl uncordon control
  347  kubectl get nodes
  348  sudo reboot
  349  kubectl get nodes
  350  sudo apt policy kubelet
  351  sudo apt policy kubelet | less
  352  cd /etc/kubernetes/manifests/
  353  sudo mv * ..
  354  sudo systemctl stop kubelet
  355  sudo apt-mark unhold kubelet kubectl && sudo apt-get update && sudo apt-get install -y kubelet=1.27.3-00 kubectl=1.27.3-00 && sudo apt-mark hold kubelet kubectl
  356  sudo systemctl start kubelet
  357  sudo mv ../*yaml .
  358  kubectl get nodes
  359  cd
  360  cd cka
  361  ./counter.sh 9
  362  kubectl run blah --image=nginx --dry-run=client -o yaml
  363  kubectl get pods
  364  history