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por Charles Konkol

The EXL Challenge

por David Bailey

Administration k8s

ConfigMaps et Secrets

* centraliser, améliorer et faciliter la gestion des configurations

* etcd, consul / vault...

* stocker les fichiers de configuration : - les isoler - les sécuriser - les manipuler - les partager (entre pods)

* amélioration des config-file de docker/dockerfile - reconstruction des images

secrets = configmaps avec encoding en base 64
attention sécurité : les secrets peuvent être manipulés en manifeste

───────────────────────────────────────────────────────────
   1   │ apiVersion: v1
   2   │ kind: ConfigMap
   3   │ metadata:
   4   │   name: personne
   5   │ data:
   6   │   nom: Xavier
   7   │   passion: blogging
   8   │   clef:
   9   │
  10   │    age.key=40
  11   │    taille.key=180

samik@ImacKris-2:~/kubernetes/manifestes » kubectl apply -f monconfmap.yml
configmap/personne created

samik@ImacKris-2:~/kubernetes/manifestes » kubectl logs monpod
NOM=Xavier
KUBERNETES_SERVICE_PORT=443
KUBERNETES_PORT=tcp://10.96.0.1:443
HOSTNAME=monpod
MONNGINX_SERVICE_HOST=10.105.198.108
MONNGINX_PORT_8080_TCP_ADDR=10.105.198.108
SHLVL=1
HOME=/root
MONNGINX_SERVICE_PORT_8080_80=8080
MONNGINX_PORT_8080_TCP_PORT=8080
MONNGINX_PORT_8080_TCP_PROTO=tcp
MONNGINX_PORT=tcp://10.105.198.108:8080
MONNGINX_SERVICE_PORT=8080
MONNGINX_PORT_8080_TCP=tcp://10.105.198.108:8080
KUBERNETES_PORT_443_TCP_ADDR=10.96.0.1
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
KUBERNETES_PORT_443_TCP_PORT=443
KUBERNETES_PORT_443_TCP_PROTO=tcp
PASSION=blogging
KUBERNETES_PORT_443_TCP=tcp://10.96.0.1:443
KUBERNETES_SERVICE_PORT_HTTPS=443
KUBERNETES_SERVICE_HOST=10.96.0.1
PWD=/

volume

kind: ConfigMap
apiVersion: v1
metadata:
  name: hello
data:
  clef: |
    Bonjour
    les
    Xavkistes !!!

repertoire

création de 2 fichiers :

samik@ImacKris-2:~/kubernetes/manifestes » ll *html
.rw-r--r-- 16 samik 13 nov 15:37 index.html
.rw-r--r-- 20 samik 13 nov 15:38 samik.html

apiVersion: v1
kind: Pod
metadata:
  name: monpod
spec:
  containers:
    - name: nginx
      image: nginx
      ports:
        - containerPort: 80
      volumeMounts:
        - mountPath: /usr/share/nginx/html/
          name: mondir
  volumes:
    - name: mondir
      configMap:
        name: mondir

kubectl create configmap mondir --from-file=index.html --from-file=samik.html

samik@ImacKris-2:~/kubernetes/manifestes » kubectl describe configmaps mondir
Name:     mondir
Namespace:  default
Labels:    <none>
Annotations: <none>

Data
====
index.html:
----
page par defaut

samik.html:
----
 page additionnelle

Events: <none>

checlk

[vagrant@kmaster ~]$ kubectl get all -o wide
NAME     READY  STATUS  RESTARTS  AGE   IP        NODE          NOMINATED NODE  READINESS GATES
pod/monpod  1/1   Running  0     5m18s  192.168.136.104  kworker2.example.com  <none>      <none>

NAME         TYPE    CLUSTER-IP    EXTERNAL-IP  PORT(S)     AGE  SELECTOR
service/kubernetes  ClusterIP  10.96.0.1    <none>    443/TCP     52d  <none>
service/monnginx   NodePort  10.105.198.108  <none>    8080:31818/TCP  27h  app=monnginx

NAME                      REFERENCE       TARGETS     MINPODS  MAXPODS  REPLICAS  AGE
horizontalpodautoscaler.autoscaling/monnginx  Deployment/monnginx  <unknown>/80%  1     5     2     9d
[vagrant@kmaster ~]$ curl 192.168.136.104
Bonjour
les
Xavkistes !!!

apiVersion: v1
kind: Pod
metadata:
  name: monpod
spec:
  containers:
    - name: nginx
      image: nginx
      ports:
        - containerPort: 80
      volumeMounts:
        - mountPath: /usr/share/nginx/html/
          name: monvolumeconfig
  volumes:
    - name: monvolumeconfig
      configMap:
        name: hello
        items:
          - key: clef
            path: index.html

configMapKeyRef

* variables env : configMapKeyRef

apiVersion: v1
kind: Pod
metadata:
  name: monpod
spec:
  containers:
  - name: test-container
    image: busybox
    command: ["/bin/sh", "-c", "env"]
    env:
    - name: NOM
      valueFrom:
        configMapKeyRef:
          name: personne
          key: nom
    - name: PASSION
      valueFrom:
        configMapKeyRef:
          name: personne
          key: passion

apiVersion: v1
kind: Pod
metadata:
  name: monpod
spec:
  containers:
  - name: test-container
    image: busybox
    command: ["/bin/sh", "-c", "env"]
    envFrom:
    - configMapRef:
        name: personne

get/describe

samik@ImacKris-2:~/kubernetes/manifestes » kubectl get configmaps

NAME DATA AGE

langue 1 3s

samik@ImacKris-2:~/kubernetes/manifestes » kubectl describe configmaps

Name: langue

Namespace: default

Labels: <none>

Annotations: <none>

Data

====

LANGUAGE:

----

Events: <none>

create secret

samik@ImacKris-2:~/kubernetes/manifestes » kubectl create secret generic mysql-password --from-literal=MYSQL_PASSWORD=monmotdepasse

secret/mysql-password created

replace

* création d'un fichier manifeste et exécution

kubectl replace -f manifeste.yml

ex:

samik@ImacKris-2:~/kubernetes/manifestes » kubectl create configmap maconf --from-literal=LANGUAGE=Es -o yaml --dry-run 1 ↵

W1113 13:19:50.764212  97661 helpers.go:553] --dry-run is deprecated and can be replaced with --dry-run=client.
apiVersion: v1
data:
 LANGUAGE: Es
kind: ConfigMap
metadata:
 creationTimestamp: null
 name: maconf

* génération à blanc et remplacement

 kubectl create configmap maconf --from-literal=LANGUAGE=Es -o yaml --dry-run | kubectl replace -f -

_{Rq : redémarrage nécessaire}

edit

kubectl edit configmaps maconfiguration:

ouvre l'éditeur d'un yml

```

1 # Please edit the object below. Lines beginning with a '#' will be ignored,

2 # and an empty file will abort the edit. If an error occurs while saving thii

s file will be

3 # reopened with the relevant failures.

4 #

5 apiVersion: v1

6 data:

7 maconf.cfg: "192.168.0.11 imacpat\n192.168.0.44 kaisenlinux\n192.1688

.0.23

8 \ mbp\n192.168.0.69\tabacus\n192.168.0.28\tnexus\n192.168.0.57\tipadkrr

is\n192.168.100.102

9 VCS2\n192.168.100.101 VCS1\n192.168.5.10 gitlab.example.com\n192.168.0.22

00 monitor

10 \n"

11 kind: ConfigMap

12 metadata:

13 creationTimestamp: "2020-11-13T12:07:19Z"

14 name: maconfiguration

15 namespace: default

16 resourceVersion: "1409322"

17 selfLink: /api/v1/namespaces/default/configmaps/maconfiguration

18 uid: c07e5649-9bce-4543-80a5-932f640b3d05

```

create

samik@ImacKris-2:~/kubernetes/manifestes » kubectl create configmap langue --from-literal=LANGUAGE=Fr

configmap/langue created

samik@ImacKris-2:~/kubernetes/manifestes » kubectl create configmap langue --from-literal=LANGUAGE=Fr --from-literal=ENCODING=UTF-8

configmap/langue created

samik@ImacKris-2:~/kubernetes/manifestes » kubectl get configmaps

NAME DATA AGE

langue 2 7s

samik@ImacKris-2:~/kubernetes/manifestes » kubectl describe configmaps

Name: langue

Namespace: default

Labels: <none>

Annotations: <none>

Data

====

ENCODING:

----

UTF-8

LANGUAGE:

----

Events: <none>

--from-file

kubectl create configmap maconfiguration --from-file maconf.cfg

samik@ImacKris-2:~/kubernetes/manifestes » kubectl describe configmaps maconfiguration

Name: maconfiguration

Namespace: default

Labels: <none>

Annotations: <none>

Data

====

maconf.cfg:

----

192.168.0.11 imacpat

192.168.0.44 kaisenlinux

192.168.0.23 mbp

192.168.0.69 abacus

192.168.0.28 nexus

192.168.0.57 ipadkris

192.168.100.102 VCS2

192.168.100.101 VCS1

192.168.5.10 gitlab.example.com

192.168.0.200 monitor

Events: <none>

delete

samik@ImacKris-2:~/kubernetes/manifestes » kubectl delete configmap langue

configmap "langue" deleted

get/describe secrets

samik@ImacKris-2:~/kubernetes/manifestes » kubectl get secrets

NAME TYPE DATA AGE

default-token-nmzdm kubernetes.io/service-account-token 3 52d

mysql-password Opaque 1 2m30s

samik@ImacKris-2:~/kubernetes/manifestes » kubectl describe secrets mysql-password

Name: mysql-password

Namespace: default

Labels: <none>

Annotations: <none>

Type: Opaque

Data

====

MYSQL_PASSWORD: 13 bytes

contextes

kubectl config get-contexts

kubectl config use-context samik

création

kubectl config set-context samik --namespace samik --user kubernetes-admin --cluster kubernetes

kubectl get pods -n kube-system

kubectl create namespace samik

kubectl create deploy monnginx --image nginx -n samik

Labels & annotations

kubectl get pods --selector "env=prod" --show-labels

kubectl label

env=dev

Etat de santé "healthcheck

TCPSocket

HttpGet

command

variables

modes

scénario

readiness

= remplacement des pods defectueux

liveness

= restart auto

ressources

generer

YAML

régénérer un déploiement & service

permet de lancer un déploiement

kubectl apply -f ~/kubernetes/mondeploy.yml

kubectl get deployments.apps monnginx -o yaml > ~/kubernetes/mondeploy.yml

descriptif

kubectl get ...

-o yaml

> fichier.yml

lister

kubectl explain pod

kubectl api-versions

kubectl api-resources -o wide

Logs

logs, events et describe

describe

kubectl describe

deploy nginx

service nginx

pods nginx

events

kubectl get events nginx...

kubectl logs nginx

Pods et services

kubectl get

all

-o wide

deploy

composants

kubectl get daemonsets

-n kube-system

kubectl get componentstatuses

nodes

kubectl describe nodes kubmaster

kubectl get nodes

externe

NFS

exemples

plusieurs pods sur un V

debian

apiVersion: v1
kind: Pod
metadata:
  name: debian-deploy
spec:
  containers:
    - image: debian
      name: madebian
      resources: {}
      volumeMounts:
        - mountPath: /tmp/
          name: monvolume
  volumes:
    - name: monvolume
      persistentVolumeClaim:
        claimName: mynfspvc

nginx

apiVersion: v1
kind: Pod
metadata:
  name: nginx-deploy
spec:
  containers:
    - image: nginx
      name: monnginx
      resources: {}
      volumeMounts:
        - mountPath: /usr/share/nginx/html
          name: monvolume
  volumes:
    - name: monvolume
      persistentVolumeClaim:
        claimName: mynfspvc

BDD

* attention : particularité BDD (deploy/statefulset)

* création du PV

apiVersion: v1
kind: Pod
metadata:
  name: debian-deploy
spec:
  containers:
  - image: mysql:5.6
    name: mysql
    env:
    - name: MYSQL_ROOT_PASSWORD
      value: "123456"
    ports:
    - containerPort: 3306
    volumeMounts:
    - mountPath: /var/lib/mysql
      name: monvolume
  volumes:
  - name: monvolume
    persistentVolumeClaim:
      claimName: mynfspvc

Création du Pod

* manifeste Pod :

apiVersion: v1
kind: Pod
metadata:
  name: nginx-deploy
spec:
  containers:
  - image: nginx
    name: nginx
    resources: {}
    volumeMounts:
    - mountPath: /usr/share/nginx/html
      name: www
  volumes:
  - name: www
    persistentVolumeClaim:
      claimName: pvc-nfs-pv1

PVC1

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mynfspvc
spec:
  storageClassName: myclass
  accessModes:
  - ReadWriteMany
  resources:
    requests:
      storage: 500Mi

PVC

Création du Persistent Volume Claim

* manifest PVC :

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mynfspvc
spec:
  storageClassName: manual
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 500Mi

PV1

apiVersion: v1
kind: PersistentVolume
metadata:
  name: mynfspv
spec:
  storageClassName: myclass
  capacity:
    storage: 1Gi
  accessModes:
  - ReadWriteMany
  #persistentVolumeReclaimPolicy: Delete
  nfs:
    server: 192.168.56.1
    path: "/srv/exports"

apiVersion: v1
kind: PersistentVolume
metadata:
  name: mynfspv
spec:
  storageClassName: manual
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteMany
  nfs:
    server: 192.168.56.1
    path: "/srv/exports"

persistent volume

séparation entre provision et consommation

* kubernetes propose du provisioning - persistentVolumes et persistentVolumesClaim

* imbrication : PV > PVC > Pods provisioning > quota pods > utilisation pods

* Server NFS > PV > PVC > Pod

* suivant provider, utilisation de reclaimPolicy :

- delete : si suppression du PVC > sup du PV
- recycle : recyclage (pas de suppression mais il est vidé)
- retain : volume conservé mais versions

Suivant les règles Access Modes des PV :

connecter plusieurs pods sur le même volume
supprimer un pod et en relancer un nouveau avec les mêmes datas

Types :

ReadWriteOnce : monté sur un simple pod
ReadOnlyMany : montés sur plusieurs pods en lecture
ReadWriteMany : lecture écriture sur plusieurs pods

utilisation

Utilisation par les Pods

kind: Pod
apiVersion: v1
metadata:
  name: monpods
spec:
  volumes:
    - name: monstorage
      persistentVolumeClaim:
       claimName: monpvc
  containers:
    - name: monnginx
      image: nginx
      ports:
        - containerPort: 80
      volumeMounts:
        - mountPath: "/usr/share/nginx/html"
          name: monstorage

persistent volume Claim: PVC

Persistent Volume Claim

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: monpvc
spec:
  storageClassName: manual
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
kubectl get pvc

persistent volume: PV

Persistent Volume

kind: PersistentVolume
apiVersion: v1
metadata:
  name: monpv
  labels:
    type: local
spec:
  storageClassName: manual
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/pvdata"

Rq : - ReadWriteOnce : monté sur un simple pod - ReadOnlyMany : montés sur plusieurs pods en lecture - ReadWriteMany : lecture écriture sur plusieurs pods

kubectl get pv

hostPath

Volume : hostPath

volume du host monté dans le pod (dans le conteneur)
aujourd’hui votre pod est sur ce noeud mais demain sur un autre

attention : uniquement sur le pod

en cas de mouvement perte de la data
prévoir un stockage sur toutes les machines (GlusterFS distribué, NFS…)

apiVersion: v1
kind: Pod
metadata:
  name: monpod
spec:
  containers:
  - name: nginx
    image: nginx
    ports:
    - containerPort: 80
    volumeMounts:
    - mountPath: /usr/share/nginx/html
      name: monvolume
  volumes:
  - name: monvolume
    hostPath:
      path: /srv/data
      type: Directory

emptyDir

Volume : emptyDir

permet de partager un volume éphémère entre conteneurs d’un même pod

répartir le travail entre les pods

spec:
  containers:
  - name: monnginx
    image: nginx
    ports:
    - containerPort: 80
    volumeMounts:
    - mountPath: /usr/share/nginx/html
      name: monvolume
  - name: mondebian
    image: debian
    command: ["sleep", "600"]
    volumeMounts:
    - mountPath: /worktmp/
      name: monvolume
  - name: monalpine
    image: alpine
    command: ['sh', '-c', 'echo "Bonjour xavki" >/myjob/index.html' ]
    volumeMounts:
    - mountPath: /myjob/
      name: monvolume
  volumes:
  - name: monvolume
    emptyDir: {}

Volume : emptyDir en ram

  volumes:
  - name: monvolume
    emptyDir:
      medium: Memory

replicaset

ReplicaSet : dupliquer vos pods

* créer des réplicas de pods

préférer la ressource deployment (plus récente et plus large)
ne pas confondre avec du scaling : nombre d'instance fixe

* 2 manières :

- attachée aux pods :

- template de pods

- au sein du même fichier

- détachée des pods

- création de pods puis d'un replicaset

- selector pour sélectionner les pods ciblés

HPA

kubectl autoscale rs frontend --max=10

autoscaling

Squelette

apiVersion: autoscaling/v1
kind: HorizontalPodAutoscaler
metadata:
  name: monhpa
spec:
  scaleTargetRef:
    apiVersion: extensions/v1beta1
    kind: Deployment
    name: monfront
  minReplicas: 3
  maxReplicas: 10
  targetCPUUtilizationPercentage: 11

Création d’un déploiement

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: monfront
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: monfront
    spec:
      containers:
      - name: monpod
        image: httpd
        resources:
          requests:
            cpu: 10m

ajout à un pod

création replicaset

Replicaset : appariement de Pod

création du replicaset

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: front2
  labels:
    app: front
spec:
  replicas: 3
  selector:
    matchLabels:
      type: front
      env: prod
  template:
    metadata:
      labels:
        type: front
        env: prod
    spec:
      containers:
      - name: nginx
        image: nginx

creation pod

Replicaset : appariement de Pod

création d’un pod seul

apiVersion: v1
kind: Pod
metadata:
  name: mypod
  labels:
    env: prod
    type: front
spec:
  containers:
  - name: nginx
    image: nginx

kubectl describe rs

samik@ImacKris-2:~/kubernetes/manifestes » kubectl describe rs myfirstdeploy-9dc984dd8

Name: myfirstdeploy-9dc984dd8

Namespace: default

Selector: app=monfront,pod-template-hash=9dc984dd8

Labels: app=monfront

pod-template-hash=9dc984dd8

Annotations: deployment.kubernetes.io/desired-replicas: 2

deployment.kubernetes.io/max-replicas: 4

deployment.kubernetes.io/revision: 1

Controlled By: Deployment/myfirstdeploy

Replicas: 2 current / 2 desired

Pods Status: 2 Running / 0 Waiting / 0 Succeeded / 0 Failed

Pod Template:

Labels: app=monfront

pod-template-hash=9dc984dd8

Annotations: kubernetes.io/change-cause: Mise à jour version 1.16

Containers:

podfront:

Image: nginx:1.16

Port: 80/TCP

Host Port: 0/TCP

Readiness: http-get http://:80/ delay=5s timeout=1s period=5s #success=1 #failure=3

Environment: <none>

Mounts: <none>

Volumes: <none>

Events:

Type Reason Age From Message

---- ------ ---- ---- -------

Normal SuccessfulCreate 100s replicaset-controller Created pod: myfirstdeploy-9dc984dd8-pdjbz

Normal SuccessfulCreate 100s replicaset-controller Created pod: myfirstdeploy-9dc984dd8-z86j9

kubectl get rs

samik@ImacKris-2:~/kubernetes/manifestes » kubectl get rs

NAME DESIRED CURRENT READY AGE

myfirstdeploy-9dc984dd8 2 2 0 9s

squelette

apiVersion: apps/v1
kind: replicaSet		# set ressources
metadata: 					# metadata spécifiques au replicaset
spec:								# conf du réplicaset
  replicas: 2				# nombre de replicas
  selector:					# utilisation de la sélection
  matchLabels:		# sélection sur les labels
        lab1: toto		# filtre
template:					# caractéristiques du template de pods
metadata:				# metadata des pods créés
  labels:				# définition des labels
    lab1: toto  # création du label qui va matcher
spec: 					# spec des pods

Pods

création avec un manifeste

fichier monpodnginx

kubectl apply -f monpodnginx.yml

creation de 2 pods

docker

kworker2

kworker1

docker ps

kubectl get pods -o wide

suppression

kubectl delete pod

anothershell

kubectl run anothershell -it --image busybox -- sh

myshell

kubectl run myshell -it --image busybox -- sh

Installation du cluster k8s: kubadm

-> Kubernetes : initialisation et join <-


<br>
* initilisation sur le master


```
kubeadm init --apiserver-advertise-address=192.168.56.101  
--node-name $HOSTNAME --pod-network-cidr=10.244.0.0/16
```

Rq :édition du host nécessaire sur Vbox et Vagrant

<br>
* création du fichier de configuration

```
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
```

---------------------------------------------------------------------


-> Mise en place du réseau interne : choix de flannel <-


<br>
* ajout pod pour gestion du réseau interne

```
sysctl net.bridge.bridge-nf-call-iptables=1

kubectl apply -f 
https://raw.githubusercontent.com/coreos/flannel/
a70459be0084506e4ec919aa1c114638878db11b/Documentation/kube-flannel.yml

# si nécessaire
kubectl edit cm -n kube-system kube-flannel-cfg
# edit network 10.244.0.0/16 to 10.10.0.0/16 pour dashboard
```



-------------------------------------------------------------------------------------------


-> Kubernetes : join <-



* on vérifie l'état des pods system :

```
kubectl get pods --all-namespace
kubectl get nodes
```

<br>
* on fait le join sur le node :

```
kubeadm join 192.168.56.101:6443 --token 5q8bsc.141bc9wjsc026u6w 
--discovery-token-ca-cert-hash sha256:e0f57e3f3055bfe4330d9e93cbd8de967dde4e4a0963f324d2fe0ccf8427fcfb
```

<br>
* on vérifie l'état des pods system :

```
kubectl get pods --all-namespace
kubectl get nodes
```

clone par git

ici, un exemple de k8s centos:

git clone https://exxsyseng@bitbucket.org/exxsyseng/k8s_centos.git

deploiement

Type

Deployment : Rolling Update - partie 1

* 2 types de déploiements pour des montées de version : - rolling update - recreate

* penser aux montées de versions : progressivité, itérations

penser aux rollbacks en cas d'imprévus

RollingUpdate

Exemple : notre bon vieux nginx

avec readiness (si pb sotie du pool)

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myfirstdeploy
  namespace: default
spec:
  replicas: 5
  selector:
    matchLabels:
      app: monfront
  template:
    metadata:
      labels:
        app: monfront
    spec:
      containers:
      - image: nginx:1.16			 # suivante 1.17
        imagePullPolicy: Always
        name: podfront
        ports:
        - containerPort: 80
        readinessProbe:
          httpGet:
             path: /
             port: 80
          initialDelaySeconds: 5
          periodSeconds: 5
          successThreshold: 1

Exposition via le service

exposition via un service

apiVersion: v1
kind: Service
metadata:
  name: myfirstdeploy
spec:
  clusterIP: 10.99.29.169
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: monfront
  type: ClusterIP

Montée de version

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myfirstdeploy
  namespace: default
spec:
  replicas: 5
  selector:
    matchLabels:
      app: monfront
  template:
    metadata:
      labels:
        app: monfront
    spec:
      containers:
      - image: nginx:1.17    
        imagePullPolicy: Always
        name: podfront
        ports:
        - containerPort: 80
        readinessProbe:
          httpGet:
             path: /
             port: 80
          initialDelaySeconds: 5
          periodSeconds: 5
          successThreshold: 1

  strategy:
    type: RollingUpdate				# type
    rollingUpdate:						# définition
      maxSurge: 2							# nb pods sup autorisé
      maxUnavailable: 0				# nb de pods down autorisés

Exemple :

- on autorise pas de réduction de nombre de pods

- maxUnavailable = 0

- on peut déborder de 2 pods

- maxSurge = 2

En plus :

- minReadySeconds : délai pour lancer un autre update de pod

- progressDeadlineSeconds : délai max pour le déploiement sinon fail

- revisionHistoryLimit : nombre d'historiques en mémoire

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myfirstdeploy
  namespace: default
spec:
  replicas: 5
  selector:
    matchLabels:
      app: monfront
  strategy:
    type: RollingUpdate				# type
    rollingUpdate:						# définition
      maxSurge: 2							# nb pods sup autorisé
      maxUnavailable: 0				# nb de pods down autorisés
  template:
    metadata:
      labels:
        app: monfront
    spec:
      containers:
      - image: nginx:1.16
        imagePullPolicy: Always
        name: podfront
        ports:
        - containerPort: 80
        readinessProbe:
          httpGet:
             path: /
             port: 80
          initialDelaySeconds: 5
          periodSeconds: 5
          successThreshold: 1```

actions

* utilisation des annotations

spec:
  template:
    metadata:
      annotations:
        kubernetes.io/change-cause: "Mise à jour version 1.16"

kubectl rollout

history

samik@ImacKris-2:~/kubernetes/manifestes » kubectl rollout history deployment myfirstdeploy

deployment.apps/myfirstdeploy

REVISION CHANGE-CAUSE

1 <none>

2 <none>

5 Mise à jour version 1.16

6 Mise à jour version 1.17

après un undo:

samik@ImacKris-2:~/kubernetes/manifestes » kubectl rollout history deployment myfirstdeploy 130 ↵

deployment.apps/myfirstdeploy

REVISION CHANGE-CAUSE

1 <none>

2 <none>

7 Mise à jour version 1.16

8 Mise à jour version 1.17

undo

samik@ImacKris-2:~ » kubectl rollout undo deployment myfirstdeploy

deployment.apps/myfirstdeploy rolled back

samik@ImacKris-2:~/kubernetes/manifestes » kubectl rollout status deployments.apps myfirstdeploy

Waiting for deployment "myfirstdeploy" rollout to finish: 2 out of 10 new replicas have been updated...

Waiting for deployment "myfirstdeploy" rollout to finish: 3 out of 10 new replicas have been updated...

Waiting for deployment "myfirstdeploy" rollout to finish: 4 out of 10 new replicas have been updated...

Waiting for deployment "myfirstdeploy" rollout to finish: 5 out of 10 new replicas have been updated...

Waiting for deployment "myfirstdeploy" rollout to finish: 6 out of 10 new replicas have been updated...

Waiting for deployment "myfirstdeploy" rollout to finish: 7 out of 10 new replicas have been updated...

Waiting for deployment "myfirstdeploy" rollout to finish: 8 out of 10 new replicas have been updated...

Waiting for deployment "myfirstdeploy" rollout to finish: 9 out of 10 new replicas have been updated...

Waiting for deployment "myfirstdeploy" rollout to finish: 2 old replicas are pending termination...

Waiting for deployment "myfirstdeploy" rollout to finish: 1 old replicas are pending termination...

deployment "myfirstdeploy" successfully rolled out

pause/resume

samik@ImacKris-2:~/kubernetes/manifestes » kubectl rollout pause deployments myfirstdeploy

deployment.apps/myfirstdeploy paused

samik@ImacKris-2:~ » kubectl rollout resume deployment myfirstdeploy 1 ↵

deployment.apps/myfirstdeploy resumed

status

samik@ImacKris-2:~/kubernetes/manifestes » kubectl rollout pause deployments myfirstdeploy

deployment.apps/myfirstdeploy paused

samik@ImacKris-2:~/kubernetes/manifestes » kubectl rollout status deployments.apps myfirstdeploy

Waiting for deployment "myfirstdeploy" rollout to finish: 2 out of 10 new replicas have been updated...

Waiting for deployment spec update to be observed...