Skaffold 和 microk8s -- 容器服务器正在等待启动： <image> 无法拉取

Question

我在安装了microk8s和skaffold的unbuntu 20.04上遇到了这个错误。

container server is waiting to start: aliwatters/dkc-multi-server:7b9b7d87ab81483cdb9b1227780d68dec815fe271aea2f9fe3a0e65090d90909 can't be pulled

我已经登录到docker.

完整错误是

exiting dev mode because first deploy failed: 1/1 deployment(s) failed
ali@stinky:~/git/dkc-multi-k8s (feature-skaffold-minimal)$ skaffold dev
Listing files to watch...
- aliwatters/dkc-multi-server
Generating tags...
- aliwatters/dkc-multi-server -> aliwatters/dkc-multi-server:90d1283
Checking cache...
- aliwatters/dkc-multi-server: Found Locally
Tags used in deployment:
- aliwatters/dkc-multi-server -> aliwatters/dkc-multi-server:7b9b7d87ab81483cdb9b1227780d68dec815fe271aea2f9fe3a0e65090d90909
Starting deploy...
- service/server-cluster-ip-service created
- deployment.apps/server-deployment created
Waiting for deployments to stabilize...
- deployment/server-deployment: creating container server
- pod/server-deployment-5f496cf9c7-8dfp8: creating container server
- pod/server-deployment-5f496cf9c7-hzc2l: creating container server
- pod/server-deployment-5f496cf9c7-2mn6x: container server is waiting to start: aliwatters/dkc-multi-server:7b9b7d87ab81483cdb9b1227780d68dec815fe271aea2f9fe3a0e65090d90909 can't be pulled
- deployment/server-deployment failed. Error: creating container server.
Cleaning up...
- service "server-cluster-ip-service" deleted
- deployment.apps "server-deployment" deleted
exiting dev mode because first deploy failed: 1/1 deployment(s) failed

所有相关文件;

ali@stinky:~/git/dkc-multi-k8s (feature-skaffold-minimal)$ cat skaffold.yaml 
apiVersion: skaffold/v2beta11
kind: Config
build:
artifacts:
- image: aliwatters/dkc-multi-server
context: server
docker:
dockerfile: Dockerfile.dev
sync:
manual:
- src: '**/*.js'
dest: .
local:
push: false
deploy:
kubectl:
manifests:
- k8s/server-cluster-ip-service.yaml
- k8s/server-deployment.yaml
ali@stinky:~/git/dkc-multi-k8s (feature-skaffold-minimal)$ cat k8s/server-deployment.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
name: server-deployment
spec:
replicas: 3
selector:
matchLabels:
component: server
template:
metadata:
labels:
component: server
spec:
containers:
- name: server
image: aliwatters/dkc-multi-server
imagePullPolicy: IfNotPresent
ports:
- containerPort: 5000
env:
- name: REDIS_HOST
value: redis-cluster-ip-service
- name: REDIS_PORT
value: '6379'
- name: PGUSER
value: postgres
- name: PGHOST
value: postgres-cluster-ip-service
- name: PGPORT
value: '5432'
- name: PGDATABASE
value: postgres
- name: PGPASSWORD
valueFrom:
secretKeyRef:
name: pgpasswd
key: PGPASSWORD
ali@stinky:~/git/dkc-multi-k8s (feature-skaffold-minimal)$ cat k8s/server-cluster-ip-service.yaml 
apiVersion: v1
kind: Service
metadata:
name: server-cluster-ip-service
spec:
type: ClusterIP
selector:
component: server
ports:
- port: 5000
targetPort: 5000

和microk8s配置

ali@stinky:~/git/dkc-multi-k8s (feature-skaffold-minimal)$ more ~/.kube/config 
apiVersion: v1
clusters:
- cluster:
certificate-authority-data: LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JSURBVENDQWVtZ0F3SUJBZ0lKQUx
aR3B0NDZ... snip ..EhqYThFZjBsMzVFdmxFa1pJeGpwOHh5NEVLUHMKTFpCbDB3TT0KLS0tLS1FTkQgQ0VSV
ElGSUNBVEUtLS0tLQo=
server: https://127.0.0.1:16443
name: microk8s-cluster
contexts:
- context:
cluster: microk8s-cluster
user: admin
name: microk8s
current-context: microk8s
kind: Config
preferences: {}
users:
- name: admin
user:
token: VDlqa3BnWlR4Q3UzaHhpQnFvamlkbDdBRk9aMzdBcDkvMFhZT21ad1VqND0K

版本

ali@stinky:~/git/dkc-multi-k8s (feature-skaffold-minimal)$ snap list
Name                  Version                     Rev    Tracking         Publisher    Notes
kubectl               1.20.2                      1811   latest/stable    canonical✓   classic
microk8s              v1.20.1                     1910   1.20/stable      canonical✓   classic
ali@stinky:~/git/dkc-multi-k8s (feature-skaffold-minimal)$ kubectl version
Client Version: version.Info{Major:"1", Minor:"20+", GitVersion:"v1.20.1-34+e7db93d188d0d1", GitCommit:"e7db93d188d0d12f2fe5336d1b85cdb94cb909d3", GitTreeState:"clean", BuildDate:"2021-01-11T23:48:42Z", GoVersion:"go1.15.6", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"20+", GitVersion:"v1.20.1-34+e7db93d188d0d1", GitCommit:"e7db93d188d0d12f2fe5336d1b85cdb94cb909d3", GitTreeState:"clean", BuildDate:"2021-01-11T23:50:46Z", GoVersion:"go1.15.6", Compiler:"gc", Platform:"linux/amd64"}
ali@stinky:~/git/dkc-multi-k8s (feature-skaffold-minimal)$ skaffold version
v1.18.0

任何想法?

Answer 1

这是因为MicroK8s看不到由本地Docker守护进程构建的映像。这个问题的最终解决方案正在这个GitHub问题中讨论。

目前，您可以通过将图像导入MicroK8s来解决这个问题:

docker save myimage > myimage.tar;
microk8s ctr image import myimage.tar;

如果您喜欢全局解决方案，您可以使用microk8s enable registry启动MicroK8s内置注册表。这将在localhost的32000端口上公开为NodePort服务。

然后通过使用--default-repo或仅使用-d运行具有默认repo功能的Skaffold命令:

skaffold run -d localhost:32000