plugin type="calico" failed (add): invalid character 'd' looking for beginning of value

[13567436138]

What happend:

 Warning  FailedCreatePodSandBox  4s    kubelet            Failed to create pod sandbox: rpc error: code = Unknown desc = failed to setup network for sandbox "cc39aedf1e6180082fafb684f1fac6813f3c208e92c2e1633a5e398c0685182c": plugin type="multus" name="multus-cni-network" failed (add): [default/samplepod/8aaace7d-f22c-429d-8191-1d160e92c130:k8s-pod-network]: error adding container to network "k8s-pod-network": plugin type="calico" failed (add): invalid character 'd' looking for beginning of value

apiVersion: projectcalico.org/v3
kind: IPPool
metadata:
  name: my-ip-pool
  namespace: kube-system
spec:
  cidr: 192.168.0.0/16         # 你的 IP 范围
  ipipMode: Always             # IPIP 模式
  natOutgoing: true            # 启用 NAT
  blockSize: 26                # 块大小

cat <<EOF | kubectl create -f -
apiVersion: "k8s.cni.cncf.io/v1"
kind: NetworkAttachmentDefinition
metadata:
  name: flannel-conf
spec: 
  config: '{
    "cniVersion": "0.3.1",
    "type": "flannel",
    "delegate": {
      "isDefaultGateway": true
    }
  }'
EOF

cat <<EOF | kubectl create -f -
apiVersion: v1
kind: Pod
metadata:
  name: samplepod
  annotations:
    k8s.v1.cni.cncf.io/networks: default/flannel-conf
spec:
  containers:
    - name: nginx-container
      image: nginx:latest
      ports:
        - containerPort: 80
      volumeMounts:
        - name: nginx-storage
          mountPath: /usr/share/nginx/html
  volumes:
    - name: nginx-storage
      emptyDir: {}
EOF

cat <<EOF | kubectl create -f -
apiVersion: v1
kind: Pod
metadata:
  name: samplepod
  annotations:
    cni.projectcalico.org/ipv4pools: "default-ipv4-ippool"
    k8s.v1.cni.cncf.io/networks: default/flannel-conf
spec:
  containers:
    - name: nginx-container
      image: nginx:latest
      ports:
        - containerPort: 80
      volumeMounts:
        - name: nginx-storage
          mountPath: /usr/share/nginx/html
  volumes:
    - name: nginx-storage
      emptyDir: {}
EOF

with cni.projectcalico.org/ipv4pools: "default-ipv4-ippool" got error ,without no error?

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• Multus version latest
  image path and image ID (from 'docker images')
• Kubernetes version (use kubectl version):1.31.0
• Primary CNI for Kubernetes cluster:calico
• OS (e.g. from /etc/os-release):ubuntu2404
• File of '/etc/cni/net.d/'
• File of '/etc/cni/multus/net.d'
• NetworkAttachment info (use kubectl get net-attach-def -o yaml)
• Target pod yaml info (with annotation, use kubectl get pod <podname> -o yaml)
• Other log outputs (if you use multus logging)

[hdqeing]

Hi, we had the same issue. The reason for us is that we set the annotation as String, which is exactly your case. Instead, it should be an array. Maybe you can change the annotation to the following and try again:
apiVersion: v1
kind: Pod
metadata:
name: samplepod
annotations:
cni.projectcalico.org/ipv4pools: '["default-ipv4-ippool"]'