容器编排系统K8s之crd资源

[root@master01 ~]# kubectl explain crd
KIND: CustomResourceDefinition
VERSION: apiextensions.k8s.io/v1

DESCRIPTION:
CustomResourceDefinition represents a resource that should be exposed on
the API server. Its name MUST be in the format <.spec.name>.<.spec.group>.

FIELDS:
apiVersion
APIVersion defines the versioned schema of this representation of an
object. Servers should convert recognized schemas to the latest internal
value, and may reject unrecognized values. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources

kind
Kind is a string value representing the REST resource this object
represents. Servers may infer this from the endpoint the client submits
requests to. Cannot be updated. In CamelCase. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds

metadata

spec -required-
spec describes how the user wants the resources to appear

status
status indicates the actual state of the CustomResourceDefinition

[root@master01 ~]#
　　提示：crd资源是k8s上的标准资源之一，它的定义主要有apiVersion，kind，metadata，spec和status；其中kind类型为CustomResourceDefinition，apiVersion是apiextensions.k8s.io/v1；这两个是固定格式；spec字段是用来定义对应指定资源类型资源的相关属性；

crd.spec字段说明

t@master01 ~]# kubectl explain crd.spec
KIND: CustomResourceDefinition
VERSION: apiextensions.k8s.io/v1

RESOURCE: spec

DESCRIPTION:
spec describes how the user wants the resources to appear

 CustomResourceDefinitionSpec describes how a user wants their resource to
 appear

FIELDS:
conversion
conversion defines conversion settings for the CRD.

group -required-
group is the API group of the defined custom resource. The custom resources
are served under /apis//.... Must match the name of the
CustomResourceDefinition (in the form .).

names -required-
names specify the resource and kind names for the custom resource.

preserveUnknownFields
preserveUnknownFields indicates that object fields which are not specified
in the OpenAPI schema should be preserved when persisting to storage.
apiVersion, kind, metadata and known fields inside metadata are always
preserved. This field is deprecated in favor of setting
x-preserve-unknown-fields to true in
spec.versions[*].schema.openAPIV3Schema. See
https://kubernetes.io/docs/tasks/access-kubernetes-api/custom-resources/custom-resource-definitions/#pruning-versus-preserving-unknown-fields
for details.

scope -required-
scope indicates whether the defined custom resource is cluster- or
namespace-scoped. Allowed values are Cluster and Namespaced.

versions <[]Object> -required-
versions is the list of all API versions of the defined custom resource.
Version names are used to compute the order in which served versions are
listed in API discovery. If the version string is “kube-like”, it will sort
above non “kube-like” version strings, which are ordered lexicographically.
“Kube-like” versions start with a “v”, then are followed by a number (the
major version), then optionally the string “alpha” or “beta” and another
number (the minor version). These are sorted first by GA > beta > alpha
(where GA is a version with no suffix such as beta or alpha), and then by
comparing major version, then minor version. An example sorted list of
versions: v10, v2, v1, v11beta2, v10beta3, v3beta1, v12alpha1, v11alpha2,
foo1, foo10.

[root@master01 ~]# cat crontab-crd.yaml
apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:

名字必需与下面的 spec 字段匹配，并且格式为 ‘<名称的复数形式>.<组名>’

name: crontabs.stable.example.com
spec:

组名称，用于 REST API: /apis/<组>/<版本>

group: stable.example.com

列举此 CustomResourceDefinition 所支持的版本

versions:
- name: v1
# 每个版本都可以通过 served 标志来独立启用或禁止
served: true
# 其中一个且只有一个版本必需被标记为存储版本
storage: true
schema:
openAPIV3Schema:
type: object
properties:
spec:
type: object
properties:
cronSpec:
type: string
image:
type: string
replicas:
type: integer

可以是 Namespaced 或 Cluster

scope: Namespaced
names:
# 名称的复数形式，用于 URL：/apis/<组>/<版本>/<名称的复数形式>
plural: crontabs
# 名称的单数形式，作为命令行使用时和显示时的别名
singular: crontab
# kind 通常是单数形式的驼峰编码（CamelCased）形式。你的资源清单会使用这一形式。
kind: CronTab
# shortNames 允许你在命令行使用较短的字符串来匹配资源
shortNames:
- ct
[root@master01 ~]#
　　应用资源清单前使用kubectl get crontab

[root@master01 ~]# kubectl get crontab
error: the server doesn’t have a resource type “crontab”
[root@master01 ~]#
　　提示：在没有应用资源清单前使用kubectl get crontab，它会提示我们所没有类型为crontab的资源

应用资源清单

[root@master01 ~]# kubectl apply -f crontab-crd.yaml
customresourcedefinition.apiextensions.k8s.io/crontabs.stable.example.com created
[root@master01 ~]# kubectl get crontab
No resources found in default namespace.
[root@master01 ~]#
　　提示：应用资源清单后，再次使用kubectl get crontab就没有报错了，只是提示在default名称空间没有对应类型资源；

查看crd

[root@master01 ~]# kubectl get crd
NAME CREATED AT
bgpconfigurations.crd.projectcalico.org 2021-01-03T15:49:21Z
bgppeers.crd.projectcalico.org 2021-01-03T15:49:21Z
blockaffinities.crd.projectcalico.org 2021-01-03T15:49:21Z
clusterinformations.crd.projectcalico.org 2021-01-03T15:49:21Z
crontabs.stable.example.com 2021-01-12T12:39:00Z
felixconfigurations.crd.projectcalico.org 2021-01-03T15:49:21Z
globalnetworkpolicies.crd.projectcalico.org 2021-01-03T15:49:21Z
globalnetworksets.crd.projectcalico.org 2021-01-03T15:49:21Z
hostendpoints.crd.projectcalico.org 2021-01-03T15:49:21Z
ipamblocks.crd.projectcalico.org 2021-01-03T15:49:21Z
ipamconfigs.crd.projectcalico.org 2021-01-03T15:49:21Z
ipamhandles.crd.projectcalico.org 2021-01-03T15:49:21Z
ippools.crd.projectcalico.org 2021-01-03T15:49:21Z
kubecontrollersconfigurations.crd.projectcalico.org 2021-01-03T15:49:21Z
networkpolicies.crd.projectcalico.org 2021-01-03T15:49:21Z
networksets.crd.projectcalico.org 2021-01-03T15:49:22Z
[root@master01 ~]# kubectl get crd/crontabs.stable.example.com
NAME CREATED AT
crontabs.stable.example.com 2021-01-12T12:39:00Z
[root@master01 ~]#
　　查看详情

[root@master01 ~]# kubectl get crd/crontabs.stable.example.com
NAME CREATED AT
crontabs.stable.example.com 2021-01-12T12:39:00Z
[root@master01 ~]# kubectl describe crd/crontabs.stable.example.com
Name: crontabs.stable.example.com
Namespace:
Labels:
Annotations:
API Version: apiextensions.k8s.io/v1
Kind: CustomResourceDefinition
Metadata:
Creation Timestamp: 2021-01-12T12:39:00Z
Generation: 1
Managed Fields:
API Version: apiextensions.k8s.io/v1
Fields Type: FieldsV1
fieldsV1:
f:status:
f:acceptedNames:
f:kind:
f:listKind:
f:plural:
f:shortNames:
f:singular:
f:conditions:
Manager: kube-apiserver
Operation: Update
Time: 2021-01-12T12:39:00Z
API Version: apiextensions.k8s.io/v1
Fields Type: FieldsV1
fieldsV1:
f:metadata:
f:annotations:
.:
f:kubectl.kubernetes.io/last-applied-configuration:
f:spec:
f:conversion:
.:
f:strategy:
f:group:
f:names:
f:kind:
f:listKind:
f:plural:
f:shortNames:
f:singular:
f:scope:
f:versions:
f:status:
f:storedVersions:
Manager: kubectl-client-side-apply
Operation: Update
Time: 2021-01-12T12:39:00Z
Resource Version: 805506
UID: b92a90f4-c953-4876-a496-030c9ba023fd
Spec:
Conversion:
Strategy: None
Group: stable.example.com
Names:
Kind: CronTab
List Kind: CronTabList
Plural: crontabs
Short Names:
ct
Singular: crontab
Scope: Namespaced
Versions:
Name: v1
Schema:
openAPIV3Schema:
Properties:
Spec:
Properties:
Cron Spec:
Type: string
Image:
Type: string
Replicas:
Type: integer
Type: object
Type: object
Served: true
Storage: true
Status:
Accepted Names:
Kind: CronTab
List Kind: CronTabList
Plural: crontabs
Short Names:
ct
Singular: crontab
Conditions:
Last Transition Time: 2021-01-12T12:39:00Z
Message: no conflicts found
Reason: NoConflicts
Status: True
Type: NamesAccepted
Last Transition Time: 2021-01-12T12:39:00Z
Message: the initial names have been accepted
Reason: InitialNamesAccepted
Status: True
Type: Established
Stored Versions:
v1
Events:
[root@master01 ~]#
　　使用自定义资源类型crontab创建资源

[root@master01 ~]# cat my-crontab.yaml
apiVersion: “stable.example.com/v1”
kind: CronTab
metadata:
name: my-new-cron-object
spec:
cronSpec: “* * * * */5”
image: my-awesome-cron-image
[root@master01 ~]#
　　提示：上述资源清单表示创建一个类型为Crontab的资源，该资源的群组版本为stable.example.com/v1;

应用资源清单

[root@master01 ~]# kubectl apply -f my-crontab.yaml
crontab.stable.example.com/my-new-cron-object created
[root@master01 ~]# kubectl get ct
NAME AGE
my-new-cron-object 5s
[root@master01 ~]# kubectl describe ct/my-new-cron-object
Name: my-new-cron-object
Namespace: default
Labels:
Annotations:
API Version: stable.example.com/v1
Kind: CronTab
Metadata:
Creation Timestamp: 2021-01-12T12:45:29Z
Generation: 1
Managed Fields:
API Version: stable.example.com/v1
Fields Type: FieldsV1
fieldsV1:
f:metadata:
f:annotations:
.:
f:kubectl.kubernetes.io/last-applied-configuration:
f:spec:
.:
f:cronSpec:
f:image:
Manager: kubectl-client-side-apply
Operation: Update
Time: 2021-01-12T12:45:29Z
Resource Version: 806182
UID: 31a88a3d-fa99-42b8-80f6-3e4559efdc40
Spec:
Cron Spec: * * * * */5
Image: my-awesome-cron-image
Events:
[root@master01 ~]#
　　提示：可以看到对应类型资源已经创建成功；以上示例只是单纯的crd的使用示例，没有任何实质的作用；

部署自定义控制器

示例：部署mongodb-aperator

1、克隆项目

[root@master01 ~]# git clone https://github.com/mongodb/mongodb-kubernetes-operator.git
Cloning into ‘mongodb-kubernetes-operator’…
remote: Enumerating objects: 95, done.
remote: Counting objects: 100% (95/95), done.
remote: Compressing objects: 100% (74/74), done.
remote: Total 4506 (delta 30), reused 60 (delta 15), pack-reused 4411
Receiving objects: 100% (4506/4506), 18.04 MiB | 183.00 KiB/s, done.
Resolving deltas: 100% (2621/2621), done.
[root@master01 ~]#
　　2、创建名称空间mongodb，并进入到mongodb-kubernetes-operator目录应用crd资源，创建自定义资源类型

[root@master01 mongodb-kubernetes-operator]# kubectl create ns mongodb
namespace/mongodb created
[root@master01 mongodb-kubernetes-operator]# kubectl get ns
NAME STATUS AGE
default Active 35d
ingress-nginx Active 22d
kube-node-lease Active 35d
kube-public Active 35d
kube-system Active 35d
kubernetes-dashboard Active 11d
mongodb Active 4s
[root@master01 mongodb-kubernetes-operator]# ls
agent build deploy docs go.sum pkg release.json scripts testdata version
APACHE2 cmd dev_notes go.mod LICENSE.md README.md requirements.txt test tools.go
[root@master01 mongodb-kubernetes-operator]# kubectl apply -f deploy/crds/mongodb.com_mongodb_crd.yaml -n mongodb
Warning: apiextensions.k8s.io/v1beta1 CustomResourceDefinition is deprecated in v1.16+, unavailable in v1.22+; use apiextensions.k8s.io/v1 CustomResourceDefinition
customresourcedefinition.apiextensions.k8s.io/mongodb.mongodb.com created
[root@master01 mongodb-kubernetes-operator]#
　　验证：查看mongodb类型资源是否已经创建成功？

[root@master01 mongodb-kubernetes-operator]# kubectl get crd
NAME CREATED AT
bgpconfigurations.crd.projectcalico.org 2021-01-03T15:49:21Z
bgppeers.crd.projectcalico.org 2021-01-03T15:49:21Z
blockaffinities.crd.projectcalico.org 2021-01-03T15:49:21Z
clusterinformations.crd.projectcalico.org 2021-01-03T15:49:21Z
crontabs.stable.example.com 2021-01-12T12:39:00Z
felixconfigurations.crd.projectcalico.org 2021-01-03T15:49:21Z
globalnetworkpolicies.crd.projectcalico.org 2021-01-03T15:49:21Z
globalnetworksets.crd.projectcalico.org 2021-01-03T15:49:21Z
hostendpoints.crd.projectcalico.org 2021-01-03T15:49:21Z
ipamblocks.crd.projectcalico.org 2021-01-03T15:49:21Z
ipamconfigs.crd.projectcalico.org 2021-01-03T15:49:21Z
ipamhandles.crd.projectcalico.org 2021-01-03T15:49:21Z
ippools.crd.projectcalico.org 2021-01-03T15:49:21Z
kubecontrollersconfigurations.crd.projectcalico.org 2021-01-03T15:49:21Z
mongodb.mongodb.com 2021-01-13T06:38:22Z
networkpolicies.crd.projectcalico.org 2021-01-03T15:49:21Z
networksets.crd.projectcalico.org 2021-01-03T15:49:22Z
[root@master01 mongodb-kubernetes-operator]# kubectl get crd/mongodb.mongodb.com
NAME CREATED AT
mongodb.mongodb.com 2021-01-13T06:38:22Z
[root@master01 mongodb-kubernetes-operator]#
　　3、安装operator

1
2
3
4
5
6
[root@master01 mongodb-kubernetes-operator]# kubectl apply -f deploy/operator/ -n mongodb
deployment.apps/mongodb-kubernetes-operator created
role.rbac.authorization.k8s.io/mongodb-kubernetes-operator created
rolebinding.rbac.authorization.k8s.io/mongodb-kubernetes-operator created
serviceaccount/mongodb-kubernetes-operator created
[root@master01 mongodb-kubernetes-operator]#
　　提示：mongodb-kubernetes-operator这个项目是将自定义控制器和自定义资源类型分开实现的；其operator只负责创建和监听对应资源类型的变化，在资源有变化时，实例化为对应资源对象，并保持对应资源对象状态吻合用户期望状态；上述四个清单中主要是创建了一个sa账户，并对对应的sa用户授权；

operator.yaml内容

[root@master01 mongodb-kubernetes-operator]# cat deploy/operator/operator.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: mongodb-kubernetes-operator
spec:
replicas: 1
selector:
matchLabels:
name: mongodb-kubernetes-operator
template:
metadata:
labels:
name: mongodb-kubernetes-operator
spec:
serviceAccountName: mongodb-kubernetes-operator
containers:
- name: mongodb-kubernetes-operator
image: quay.io/mongodb/mongodb-kubernetes-operator:0.3.0
command:
- mongodb-kubernetes-operator
imagePullPolicy: Always
env:
- name: WATCH_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: OPERATOR_NAME
value: “mongodb-kubernetes-operator”
- name: AGENT_IMAGE # The MongoDB Agent the operator will deploy to manage MongoDB deployments
value: quay.io/mongodb/mongodb-agent:10.19.0.6562-1
- name: VERSION_UPGRADE_HOOK_IMAGE
value: quay.io/mongodb/mongodb-kubernetes-operator-version-upgrade-post-start-hook:1.0.2
- name: MONGODB_IMAGE
value: “library/mongo”
- name: MONGODB_REPO_URL
value: “registry.hub.docker.com”
[root@master01 mongodb-kubernetes-operator]#
　　提示：上述资源主要用deploy控制器运行对应自定义控制器为一个pod；

验证：查看operator是否正常运行

1
2
3
4
[root@master01 mongodb-kubernetes-operator]# kubectl get pods -n mongodb
NAME READY STATUS RESTARTS AGE
mongodb-kubernetes-operator-7d557bcc95-th8js 1/1 Running 0 26s
[root@master01 mongodb-kubernetes-operator]#
　　提示：能够看到operator正常运行，就表示operator已经安装成功；

验证：使用自定义资源类型创建一个mongodb 副本集集群

[root@master01 mongodb-kubernetes-operator]# cat deploy/crds/mongodb.com_v1_mongodb_cr.yaml

apiVersion: mongodb.com/v1
kind: MongoDB
metadata:
name: example-mongodb
spec:
members: 3
type: ReplicaSet
version: “4.2.6”
security:
authentication:
modes: [“SCRAM”]
users:
- name: my-user
db: admin
passwordSecretRef: # a reference to the secret that will be used to generate the user’s password
name: my-user-password
roles:
- name: clusterAdmin
db: admin
- name: userAdminAnyDatabase
db: admin
scramCredentialsSecretName: my-scram

the user credentials will be generated from this secret

once the credentials are generated, this secret is no longer required

---

apiVersion: v1
kind: Secret
metadata:
name: my-user-password
type: Opaque
stringData:
password: 58LObjiMpxcjP1sMDW
[root@master01 mongodb-kubernetes-operator]# kubectl apply -f deploy/crds/mongodb.com_v1_mongodb_cr.yaml
mongodb.mongodb.com/example-mongodb created
secret/my-user-password created
[root@master01 mongodb-kubernetes-operator]#
　　应用清单

[root@master01 mongodb-kubernetes-operator]# kubectl apply -f deploy/crds/mongodb.com_v1_mongodb_cr.yaml -n mongodb
mongodb.mongodb.com/example-mongodb created
secret/my-user-password created
[root@master01 mongodb-kubernetes-operator]# kubectl get pods -n mongodb
NAME READY STATUS RESTARTS AGE
example-mongodb-0 0/2 Pending 0 9s
mongodb-kubernetes-operator-7d557bcc95-th8js 1/1 Running 0 88s
[root@master01 mongodb-kubernetes-operator]#
　　提示：这里可以看到对应pod处于pending状态；

查看pod详细信息

[root@master01 mongodb-kubernetes-operator]# kubectl describe pod/example-mongodb-0 -n mongodb|grep -A 10 “Events”
Events:
Type Reason Age From Message

---

Warning FailedScheduling 66s (x2 over 66s) default-scheduler 0/5 nodes are available: 5 pod has unbound immediate PersistentVolumeClaims.
[root@master01 mongodb-kubernetes-operator]#
　　提示：这里提示没有可以用的pvc；

删除mongodb名称空间下pvc

[root@master01 mongodb-kubernetes-operator]# kubectl get pvc -n mongodb
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
data-volume-example-mongodb-0 Pending 92s
[root@master01 mongodb-kubernetes-operator]# kubectl delete pvc --all -n mongodb
persistentvolumeclaim “data-volume-example-mongodb-0” deleted
[root@master01 mongodb-kubernetes-operator]# kubectl get pvc -n mongodb
No resources found in mongodb namespace.
[root@master01 mongodb-kubernetes-operator]#
　　创建pv和pvc

[root@master01 mongodb-kubernetes-operator]# cd
[root@master01 ~]# cat pv-demo.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: nfs-pv-v1
labels:
app: example-mongodb-svc
spec:
capacity:
storage: 1Gi
volumeMode: Filesystem
accessModes: [“ReadWriteOnce”,“ReadWriteMany”,“ReadOnlyMany”]
persistentVolumeReclaimPolicy: Retain
mountOptions:

• hard
• nfsvers=4.1
  nfs:
  path: /data/v1
  server: 192.168.0.99

---

apiVersion: v1
kind: PersistentVolume
metadata:
name: nfs-pv-v2
labels:
app: example-mongodb-svc
spec:
capacity:
storage: 1Gi
volumeMode: Filesystem
accessModes: [“ReadWriteOnce”,“ReadWriteMany”,“ReadOnlyMany”]
persistentVolumeReclaimPolicy: Retain
mountOptions:

• hard
• nfsvers=4.1
  nfs:
  path: /data/v2
  server: 192.168.0.99

---

apiVersion: v1
kind: PersistentVolume
metadata:
name: nfs-pv-v3
labels:
app: example-mongodb-svc
spec:
capacity:
storage: 1Gi
volumeMode: Filesystem
accessModes: [“ReadWriteOnce”,“ReadWriteMany”,“ReadOnlyMany”]
persistentVolumeReclaimPolicy: Retain
mountOptions:

• hard
• nfsvers=4.1
  nfs:
  path: /data/v3
  server: 192.168.0.99
  [root@master01 ~]#
  　　应用清单创建pv

[root@master01 ~]# kubectl apply -f pv-demo.yaml
persistentvolume/nfs-pv-v1 created
persistentvolume/nfs-pv-v2 created
persistentvolume/nfs-pv-v3 created
[root@master01 ~]# kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
nfs-pv-v1 1Gi RWO,ROX,RWX Retain Available 3s
nfs-pv-v2 1Gi RWO,ROX,RWX Retain Available 3s
nfs-pv-v3 1Gi RWO,ROX,RWX Retain Available 3s
[root@master01 ~]#
　　创建pvc清单

[root@master01 ~]# cat pvc-demo.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: data-volume-example-mongodb-0
namespace: mongodb
spec:
accessModes:
- ReadWriteMany
volumeMode: Filesystem
resources:
requests:
storage: 500Mi

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: data-volume-example-mongodb-1
namespace: mongodb
spec:
accessModes:
- ReadWriteMany
volumeMode: Filesystem
resources:
requests:
storage: 500Mi

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: data-volume-example-mongodb-2
namespace: mongodb
spec:
accessModes:
- ReadWriteMany
volumeMode: Filesystem
resources:
requests:
storage: 500Mi
[root@master01 ~]#
　　应用清单创建pvc

[root@master01 ~]# kubectl get pvc -n mongodb
No resources found in mongodb namespace.
[root@master01 ~]# kubectl apply -f pvc-demo.yaml
persistentvolumeclaim/data-volume-example-mongodb-0 created
persistentvolumeclaim/data-volume-example-mongodb-1 created
persistentvolumeclaim/data-volume-example-mongodb-2 created
[root@master01 ~]# kubectl get pvc -n mongodb
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
data-volume-example-mongodb-0 Bound nfs-pv-v1 1Gi RWO,ROX,RWX 6s
data-volume-example-mongodb-1 Bound nfs-pv-v2 1Gi RWO,ROX,RWX 6s
data-volume-example-mongodb-2 Bound nfs-pv-v3 1Gi RWO,ROX,RWX 6s
[root@master01 ~]# kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
nfs-pv-v1 1Gi RWO,ROX,RWX Retain Bound mongodb/data-volume-example-mongodb-0 102s
nfs-pv-v2 1Gi RWO,ROX,RWX Retain Bound mongodb/data-volume-example-mongodb-1 102s
nfs-pv-v3 1Gi RWO,ROX,RWX Retain Bound mongodb/data-volume-example-mongodb-2 102s
[root@master01 ~]#
　　提示：可以看到对应pvc和pv已经绑定好了；

验证：查看mongodb副本集集群是否跑起来了？

[root@master01 ~]# kubectl get pods -n mongodb
NAME READY STATUS RESTARTS AGE
example-mongodb-0 2/2 Running 0 6m19s
example-mongodb-1 0/2 PodInitializing 0 10s
mongodb-kubernetes-operator-7d557bcc95-th8js 1/1 Running 0 7m38s
[root@master01 ~]# kubectl get pods -n mongodb -w
NAME READY STATUS RESTARTS AGE
example-mongodb-0 2/2 Running 0 6m35s
example-mongodb-1 1/2 Running 0 26s
mongodb-kubernetes-operator-7d557bcc95-th8js 1/1 Running 0 7m54s
example-mongodb-1 2/2 Running 0 43s
example-mongodb-2 0/2 Pending 0 0s
example-mongodb-2 0/2 Pending 0 0s
example-mongodb-2 0/2 Init:0/1 0 0s
example-mongodb-2 0/2 Init:0/1 0 1s
example-mongodb-2 0/2 Terminating 0 4s
example-mongodb-2 0/2 Terminating 0 6s
example-mongodb-2 0/2 Terminating 0 20s
example-mongodb-2 0/2 Terminating 0 20s
example-mongodb-2 0/2 Pending 0 0s
example-mongodb-2 0/2 Pending 0 0s
example-mongodb-2 0/2 Init:0/1 0 0s
example-mongodb-2 0/2 Init:0/1 0 1s
example-mongodb-2 0/2 PodInitializing 0 7s
example-mongodb-2 1/2 Running 0 14s
example-mongodb-2 2/2 Running 0 36s
^C[root@master01 ~]# kubectl get pods -n mongodb
NAME READY STATUS RESTARTS AGE
example-mongodb-0 2/2 Running 0 8m
example-mongodb-1 2/2 Running 0 111s
example-mongodb-2 2/2 Running 0 48s
mongodb-kubernetes-operator-7d557bcc95-th8js 1/1 Running 0 9m19s
[root@master01 ~]#
　　提示：可以看到对应的pod已经正常跑起来了；

验证：使用mongo 连接mongodbpod，看看对应副本集集群是否工作正常？

[root@master01 ~]# kubectl get pods -n mongodb -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
example-mongodb-0 2/2 Running 0 9m12s 10.244.4.101 node04.k8s.org
example-mongodb-1 2/2 Running 0 3m3s 10.244.2.130 node02.k8s.org
example-mongodb-2 2/2 Running 0 2m 10.244.1.130 node01.k8s.org
mongodb-kubernetes-operator-7d557bcc95-th8js 1/1 Running 0 10m 10.244.3.116 node03.k8s.org
[root@master01 ~]# mongo 10.244.4.101
MongoDB shell version v4.4.3
connecting to: mongodb://10.244.4.101:27017/test?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { “id” : UUID(“b9d16fe9-6a74-4638-96e6-70aaf3c83bfa”) }
MongoDB server version: 4.2.6
WARNING: shell and server versions do not match
example-mongodb:PRIMARY> show dbs
example-mongodb:PRIMARY> db.auth(‘my-user’,‘58LObjiMpxcjP1sMDW’)
Error: Authentication failed.
0
example-mongodb:PRIMARY> use admin
switched to db admin
example-mongodb:PRIMARY> db.auth(‘my-user’,‘58LObjiMpxcjP1sMDW’)
1
example-mongodb:PRIMARY> show dbs
admin 0.000GB
config 0.000GB
local 0.000GB
example-mongodb:PRIMARY> db.isMaster()
{
“hosts” : [
“example-mongodb-0.example-mongodb-svc.mongodb.svc.cluster.local:27017”,
“example-mongodb-1.example-mongodb-svc.mongodb.svc.cluster.local:27017”,
“example-mongodb-2.example-mongodb-svc.mongodb.svc.cluster.local:27017”
],
“setName” : “example-mongodb”,
“setVersion” : 1,
“ismaster” : true,
“secondary” : false,
“primary” : “example-mongodb-0.example-mongodb-svc.mongodb.svc.cluster.local:27017”,
“me” : “example-mongodb-0.example-mongodb-svc.mongodb.svc.cluster.local:27017”,
“electionId” : ObjectId(“7fffffff0000000000000003”),
“lastWrite” : {
“opTime” : {
“ts” : Timestamp(1610520741, 1),
“t” : NumberLong(3)
},
“lastWriteDate” : ISODate(“2021-01-13T06:52:21Z”),
“majorityOpTime” : {
“ts” : Timestamp(1610520741, 1),
“t” : NumberLong(3)
},
“majorityWriteDate” : ISODate(“2021-01-13T06:52:21Z”)
},
“maxBsonObjectSize” : 16777216,
“maxMessageSizeBytes” : 48000000,
“maxWriteBatchSize” : 100000,
“localTime” : ISODate(“2021-01-13T06:52:27.873Z”),
“logicalSessionTimeoutMinutes” : 30,
“connectionId” : 153,
“minWireVersion” : 0,
“maxWireVersion” : 8,
“readOnly” : false,
“ok” : 1,
“$clusterTime” : {
“clusterTime” : Timestamp(1610520741, 1),
“signature” : {
“hash” : BinData(0,“EcWzL7O9Ue9kmm6cQ4FumkcIP6g=”),
“keyId” : NumberLong(“6917119940596072451”)
}
},
“operationTime” : Timestamp(1610520741, 1)
}
example-mongodb:PRIMARY>