從1.11.3升級到1.12.1,檢視kubernetes日誌，發現報錯：

journalctl -f -u kubelet.service

經過查詢資料，發現是1.12因為在v1.12中的kubelet 的AttachVolumeLimit導致的，禁用
AttachVolumeLimit

master機器上，在kubelet啟動時禁止AttachVolumeLimit，增加引數：

--feature-gates=AttachVolumeLimit=false

增加後：

[[email protected] ~]# vim /etc/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=docker.service
Requires=docker.service

[Service]
WorkingDirectory=/var/lib/kubelet
#--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest
ExecStart=/opt/kube/bin/kubelet \
  --address=192.168.2.10 \
  --allow-privileged=true \
  --anonymous-auth=false \
  --authentication-token-webhook \
  --authorization-mode=Webhook \
  --client-ca-file=/etc/kubernetes/ssl/ca.pem \
  --cluster-dns=10.68.0.2 \
  --cluster-domain=cluster.local. \
  --cni-bin-dir=/opt/kube/bin \
  --cni-conf-dir=/etc/cni/net.d \
  --fail-swap-on=false \
  --feature-gates=AttachVolumeLimit=false \
  --hairpin-mode hairpin-veth \
  --hostname-override=192.168.2.10 \
  --kubeconfig=/etc/kubernetes/kubelet.kubeconfig \
  --max-pods=110 \
  --network-plugin=cni \
  --pod-infra-container-image=mirrorgooglecontainers/pause-amd64:3.1 \
  --register-node=true \
  --root-dir=/var/lib/kubelet \
  --tls-cert-file=/etc/kubernetes/ssl/kubelet.pem \
  --tls-private-key-file=/etc/kubernetes/ssl/kubelet-key.pem \
  --v=2
#kubelet cAdvisor 預設在所有介面監聽 4194 埠的請求, 以下iptables限制內網訪問
ExecStartPost=/sbin/iptables -A INPUT -s 10.0.0.0/8 -p tcp --dport 4194 -j ACCEPT
ExecStartPost=/sbin/iptables -A INPUT -s 172.16.0.0/12 -p tcp --dport 4194 -j ACCEPT
ExecStartPost=/sbin/iptables -A INPUT -s 192.168.0.0/16 -p tcp --dport 4194 -j ACCEPT
ExecStartPost=/sbin/iptables -A INPUT -p tcp --dport 4194 -j DROP
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
~                                                                                                                                                 
~                                                                                                                                                 
~                                                                                                                                                 
~                                                                                                                                                 
~                                                                                                                                                 
~                                                                                                                                                 
~                                                                                                                                                 
"/etc/systemd/system/kubelet.service" 43L, 1617C 已寫入    
 

重新載入服務：

[[email protected] ~]# systemctl daemon-reload
[[email protected] ~]# sudo systemctl restart kubelet

再次檢視日誌已經沒有報此錯誤。