MicroK8s : Enable Registry2021/05/13

To enable MicroK8s built-in Registry, Configure like follows.

[1]	Enable built-in Registry on primary Node. After enabling, [kube-proxy] listens on [0.0.0.0:32000].

# enable registry with backend storage size 30G

# default size is 20G if it's not specified

# possible to specify the size on MicroK8s 1.18.3 or later

root@dlp:~#

microk8s enable registry:size=30Gi

Addon storage is already enabled.
Enabling the private registry
Applying registry manifest
namespace/container-registry created
persistentvolumeclaim/registry-claim created
deployment.apps/registry created
service/registry created
configmap/local-registry-hosting configured
The registry is enabled
The size of the persistent volume is 30Gi

# [registry] pod starts

root@dlp:~#

microk8s kubectl get pods -A

NAMESPACE            NAME                                         READY   STATUS    RESTARTS   AGE
kube-system          metrics-server-8bbfb4bdb-sczq9               1/1     Running   0          16m
kube-system          calico-kube-controllers-847c8c99d-92dm5      1/1     Running   1          52m
kube-system          kubernetes-dashboard-7ffd448895-6cgrz        1/1     Running   0          16m
kube-system          calico-node-9wpkd                            1/1     Running   0          33m
kube-system          dashboard-metrics-scraper-6c4568dc68-5g2x2   1/1     Running   0          16m
kube-system          coredns-86f78bb79c-xcbkm                     1/1     Running   0          16m
kube-system          hostpath-provisioner-5c65fbdb4f-bvzbp        1/1     Running   0          7m10s
container-registry   registry-9b57d9df8-7v98m                     1/1     Running   0          34s

[2]	After enabling Registry, it's possible to use it with common operation.

root@dlp:~#

docker images

REPOSITORY   TAG       IMAGE ID       CREATED       SIZE
ubuntu       latest    7e0aa2d69a15   2 weeks ago   72.7MB

# tag and push

root@dlp:~#

docker tag 7e0aa2d69a15 localhost:32000/ubuntu:my-registry

root@dlp:~#

docker push localhost:32000/ubuntu:my-registry

The push refers to repository [localhost:32000/ubuntu]
2f140462f3bc: Pushed
63c99163f472: Pushed
ccdbb80308cc: Pushed
my-registry: digest: sha256:86ac87f73641c920fb42cc9612d4fb57b5626b56ea2a19b894d0673fd5b4f2e9 size: 943

root@dlp:~#

docker images

REPOSITORY               TAG           IMAGE ID       CREATED       SIZE
ubuntu                   latest        7e0aa2d69a15   2 weeks ago   72.7MB
localhost:32000/ubuntu   my-registry   7e0aa2d69a15   2 weeks ago   72.7MB

[3]	To use Registry from other Nodes, add [insecure registry].

root@node02:~#

vi /etc/docker/daemon.json

{
    "insecure-registries" : ["10.0.0.30:32000"]
}

root@node02:~#

systemctl restart docker

root@node02:~#

docker images

REPOSITORY   TAG       IMAGE ID       CREATED        SIZE
nginx        latest    f0b8a9a54136   17 hours ago   133MB

root@node02:~#

docker tag f0b8a9a54136 10.0.0.30:32000/nginx:my-registry

root@node02:~#

docker push 10.0.0.30:32000/nginx:my-registry

The push refers to repository [10.0.0.30:32000/nginx]
f0f30197ccf9: Pushed
eeb14ff930d4: Pushed
c9732df61184: Pushed
4b8db2d7f35a: Pushed
431f409d4c5a: Pushed
02c055ef67f5: Pushed
my-registry: digest: sha256:eba373a0620f68ffdc3f217041ad25ef084475b8feb35b992574cd83698e9e3c size: 1570

root@node02:~#

docker images

REPOSITORY              TAG           IMAGE ID       CREATED        SIZE
10.0.0.30:32000/nginx   my-registry   f0b8a9a54136   17 hours ago   133MB
nginx                   latest        f0b8a9a54136   17 hours ago   133MB

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