Autocomplétion:
apt-get install bash-completion
echo 'source <(kubectl completion bash)' >>~/.bashrc
source ~/.bashrcAlias pour tapez "ku" au lieu de "kubectl" :
echo "alias ku='kubectl' " >> ~/.bashrc
echo "alias kuzybox='kubectl run -i --rm --tty debug --image=busybox --restart=Never -- sh' " >> ~/.bashrc
source ~/.bashrc Installation des utilitaires kubectx et kubens:
sudo git clone https://github.com/ahmetb/kubectx /opt/kubectx
sudo ln -s /opt/kubectx/kubectx /usr/local/bin/kubectx
sudo ln -s /opt/kubectx/kubens /usr/local/bin/kubens
echo "source /opt/kubectx/completion/kubectx.bash" >> ~/.bashrc
echo "source /opt/kubectx/completion/kubens.bash" >> ~/.bashrc
source ~/.bashrcTest de votre connexion au cluster :
$ kubectl cluster-info
Kubernetes master is running at https://pcxxxxxxj.c1.gra7.k8s.ovh.net
CoreDNS is running at https://pxxxxxxj.c1.gra7.k8s.ovh.net/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
Metrics-server is running at https://pxxxxj.c1.gra7.k8s.ovh.net/api/v1/namespaces/kube-system/services/https:metrics-server:/proxy
To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.Lister les éléments de votre cluster:
$ kubectl get all
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/hello-world LoadBalancer 10.3.89.177 51.21x.xxx.xx2 80:31634/TCP 13d
service/kubernetes ClusterIP 10.3.0.1 <none> 443/TCP 2d15h
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
daemonset.apps/fluentd 0 0 0 0 0 type=prod 6d19h
NAME READY UP-TO-DATE AVAILABLE AGE
deployment.apps/hello-world-deployment 0/0 0 0 2d16h
NAME DESIRED CURRENT READY AGE
replicaset.apps/hello-world-deployment-6fcbdc8f79 0 0 0 2d16hPour commencer simplement sans se ruiner, nous avons un seul noeud (équivalent à une machine dans l'ancien monde) :
$ ku get node
NAME STATUS ROLES AGE VERSION
node-43b8731c-9a45-452f-8521-e9c683196b7d Ready <none> 13d v1.18.6Un déploiement hello-world a été installé et le résultat est un pod ( containeur créé à prtir d'une image linux alpine ) qui tourne sur le cluster:
$ ku get pod
NAME READY STATUS RESTARTS AGE
hello-world-deployment-6fcbdc8f79-t9ngq 1/1 Running 0 4m30sConnectons nous au shell linux sur le pod pour connaître son adresse IP interne:
$ ku exec -it hello-world-deployment-6fcbdc8f79-t9ngq -- sh
/ # ip a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
3: eth0@if27: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 qdisc noqueue state UP
link/ether c2:99:f0:cf:40:d4 brd ff:ff:ff:ff:ff:ff
inet 10.2.0.11/32 scope global eth0
valid_lft forever preferred_lft foreverOn veut se déplacer dans le cluster sur un pod avec plein d'outils :
kubectl run -i --tty --rm debug --image=busybox --restart=Never -- sh
If you don't see a command prompt, try pressing enter.
/ # wget 10.2.0.11:80
Connecting to 10.2.0.11:80 (10.2.0.11:80)
saving to 'index.html'
index.html 100% |************************************************************************| 241 0:00:00 ETA
'index.html' saved
/ # Depuis un autre terminal, détail du pod busybox:
$ ku get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
debug 1/1 Running 0 41s 10.2.0.14 node-43b8731c-9a45-452f-8521-e9c683196b7d <none> <none>
$ ku describe pod debug
Name: debug
Namespace: default
Priority: 0
Node: node-43b8731c-9a45-452f-8521-e9c683196b7d/51.210.250.33
Start Time: Mon, 21 Sep 2020 15:26:52 +0200
Labels: run=debug
Annotations: cni.projectcalico.org/podIP: 10.2.0.14/32
Status: Running
IP: 10.2.0.14
IPs:
IP: 10.2.0.14
Containers:
debug:
Container ID: docker://72bb1d9e18724beebccde975ae5c2ba3c3d5f405f61b8451b6fd75445471fb0f
Image: busybox
Image ID: docker-pullable://busybox@sha256:d366a4665ab44f0648d7a00ae3fae139d55e32f9712c67accd604bb55df9d05a
Port: <none>
Host Port: <none>
Args:
sh
State: Running
Started: Mon, 21 Sep 2020 15:26:54 +0200
Ready: True
Restart Count: 0
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-hxsbv (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
default-token-hxsbv:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-hxsbv
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 66s default-scheduler Successfully assigned default/debug to node-43b8731c-9a45-452f-8521-e9c683196b7d
Normal Pulling 65s kubelet, node-43b8731c-9a45-452f-8521-e9c683196b7d Pulling image "busybox"
Normal Pulled 64s kubelet, node-43b8731c-9a45-452f-8521-e9c683196b7d Successfully pulled image "busybox"
Normal Created 64s kubelet, node-43b8731c-9a45-452f-8521-e9c683196b7d Created container debug
Normal Started 64s kubelet, node-43b8731c-9a45-452f-8521-e9c683196b7d Started container debugPour détruire le pod qui a été déployé :
$ ku delete deploy hello-world-deployment
deployment.apps "hello-world-deployment" deleted
$ ku get all
NAME READY STATUS RESTARTS AGE
pod/debug 1/1 Running 0 2m43s
pod/hello-world-deployment-6fcbdc8f79-t9ngq 0/1 Terminating 0 18m
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/hello-world LoadBalancer 10.3.89.177 51.2xx.xxx.222 80:31634/TCP 13d
service/kubernetes ClusterIP 10.3.0.1 <none> 443/TCP 2d16h
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
daemonset.apps/fluentd 0 0 0 0 0 type=prod 6d19hHELM:
$ curl -L https://git.io/get_helm.sh | bash
Downloading https://get.helm.sh/helm-v2.16.12-linux-amd64.tar.gz
Preparing to install helm and tiller into /usr/local/bin
helm installed into /usr/local/bin/helm
tiller installed into /usr/local/bin/tiller
Run 'helm init' to configure helm.
$ helm init
$ helm ls
Error: configmaps is forbidden: User "system:serviceaccount:kube-system:default" cannot list resource "configmaps" in API group "" in the namespace "kube-system"STERN = le tail de Kubernetes :
$ sudo curl -L -o /usr/local/bin/stern https://github.com/wercker/stern/releases/download/1.10.0/stern_linux_amd64
$ sudo chmod +x /usr/local/bin/stern
$ stern hello-world-deployment-6fcbdc8f79-lsmxs
+ hello-world-deployment-6fcbdc8f79-lsmxs › hello-world
hello-world-deployment-6fcbdc8f79-lsmxs hello-world 2020/09/21 13:54:00 [error] 12#12: *1 open() "/usr/share/nginx/html/favicon.ico" failed (2: No such file or directory), client: 51.210.250.33, server: localhost, request: "GET /favicon.ico HTTP/1.1", host: "51.210.211.222", referrer: "http://51.210.211.222/"
hello-world-deployment-6fcbdc8f79-lsmxs hello-world 51.210.250.33 - - [21/Sep/2020:13:54:00 +0000] "GET /favicon.ico HTTP/1.1" 404 555 "http://51.210.211.222/" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36" "-"
hello-world-deployment-6fcbdc8f79-lsmxs hello-world 51.210.250.33 - - [21/Sep/2020:13:54:58 +0000] "GET / HTTP/1.1" 304 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36" "-"
hello-world-deployment-6fcbdc8f79-lsmxs hello-world 51.210.250.33 - - [21/Sep/2020:13:59:31 +0000] "GET / HTTP/1.1" 304 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36" "-"