failed to parse netconf: unexpec

背景

网络插件使用flannel的k8s集群,pod一只运行不起来,event出现failed to parse netconf: unexpected end of JSON input

解决

登录异常pod所在节点

查看子网配置

cat /run/flannel/subnet.env

得到类似如下的配置

FLANNEL_NETWORK=10.64.0.0/13
FLANNEL_SUBNET=10.64.11.65/26
FLANNEL_MTU=1450
FLANNEL_IPMASQ=true

根据pod uid查看容器id({poduid}替换为实际异常pod的uid)

docker inspect $(docker ps -f "label=io.kubernetes.pod.uid={poduid}" -f 'label=io.kubernetes.docker.type=podsandbox' -q)

添加pod网络配置({subnet}替换为第一步中获取的FLANNEL_SUBNET对应的值,{dst}替换为第一步中获取的FLANNEL_NETWORK对应的值,{containerid}替换为第二步中获取的容器id)

echo '{
        "cniVersion": "0.3.1",
        "hairpinMode": true,
        "ipMasq": false,
        "ipam": {
                "ranges": [
                        [{
                                "subnet": "{subnet}"
                        }]
                ],
                "routes": [{
                        "dst": "{dst}"
                }],
                "type": "host-local"
        },
        "isDefaultGateway": true,
        "isGateway": true,
        "mtu": 1450,
        "name": "cbr0",
        "type": "bridge"
}' > /var/lib/cni/flannel/{containerid}