kubernetes集羣的安裝異常匯---docker的驅動引擎

異常【kubelet cgroup driver：cgroupfs跟docker cgroup driver：systemd不一致】

• 異常描述

  error: failed to run Kubelet: failed to create kubelet: misconfiguration: kubelet cgroup driver: "cgroupfs" is different from docker cgroup driver: "systemd"

  啓動kubelet時

  #啓動kubelet service kubelet start #查看kubelet日誌 journalctl -f -u kubelet 

  提示以下錯誤

  10月 11 20:05:18 server03 kubelet[15984]: error: failed to run Kubelet: failed to create kubelet: misconfiguration: kubelet cgroup driver: "cgroupfs" is different from docker cgroup driver: "systemd" 10月 11 20:05:18 server03 systemd[1]: kubelet.service: main process exited, code=exited, status=1/FAILURE 10月 11 20:05:18 server03 systemd[1]: Unit kubelet.service entered failed state. 10月 11 20:05:18 server03 systemd[1]: kubelet.service failed. 

• 緣由分析
  kubelet文件驅動默認cgroupfs, 而咱們安裝的docker使用的文件驅動是systemd, 形成不一致, 致使鏡像沒法啓動。
  如今有兩種方式, 一種是修改docker, 另外一種是修改kubelet。
  我這裏採用修改docker的方式
  ==注意==：
  網上大部分教程都是說直接修改daemon.json

  #修改daemon.json vi /etc/docker/daemon.json #添加以下屬性 "exec-opts": [ "native.cgroupdriver=systemd" ] 

  這樣會致使修改後，docker沒法啓動成功，提示daemon.json與/lib/systemd/system/docker.service中native.cgroupdriver=systemd重複存在。

• 解決方案（修改docker）

  # 修改前查看docker Cgroup Driver [root@server02 ~]# docker info ... Server Version: 1.13.1 Storage Driver: overlay2 Backing Filesystem: xfs Supports d_type: true Native Overlay Diff: true Logging Driver: journald Cgroup Driver: systemd ... 

  # 修改docker.service vi /lib/systemd/system/docker.service 

  找到
  --exec-opt native.cgroupdriver=systemd \ 修改成： --exec-opt native.cgroupdriver=cgroupfs \ 

  # 重啓docker systemctl daemon-reload systemctl restart docker 

  # 修改後查看docker Cgroup Driver [root@server03 sysconfig]# docker info ... Server Version: 1.13.1 Storage Driver: overlay2 Backing Filesystem: xfs Supports d_type: true Native Overlay Diff: true Logging Driver: journald Cgroup Driver: cgroupfs ... 

  參考連接：http://www.cnblogs.com/hongdada/p/9771857.html

異常【Failed to get system container stats for kubelet.service】

• 異常描述

  failed to get container info for "/system.slice/kubelet.service": unknown container "/system.slice/kubelet.service"

  啓動kubelet時

  service kubelet start
  #查看kubelet日誌 journalctl -f -u kubelet 

  提示以下錯誤

  10月 11 19:37:46 server01 kubelet[64872]: E1011 19:37:46.150198   64872 summary.go:92] Failed to get system container stats for "/system.slice/kubelet.service": failed to get cgroup stats for "/system.slice/kubelet.service": failed to get container info for "/system.slice/kubelet.service": unknown container "/system.slice/kubelet.service" 

• 解決方案

  # 修改kubelet.service vi /lib/systemd/system/kubelet.service 

  #在ExecStart位置最後面，添加以下配置 --runtime-cgroups=/systemd/system.slice \ --kubelet-cgroups=/systemd/system.slice 

  修改後的/lib/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 ExecStart=/opt/modules/kubernetes-bins/kubelet \ --address=192.168.1.188 \ --hostname-override=192.168.1.188 \ --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/imooc/pause-amd64:3.0 \ --kubeconfig=/etc/kubernetes/kubelet.kubeconfig \ --network-plugin=cni \ --cni-conf-dir=/etc/cni/net.d \ --cni-bin-dir=/opt/modules/kubernetes-bins \ --cluster-dns=10.68.0.2 \ --cluster-domain=cluster.local. \ --allow-privileged=true \ --fail-swap-on=false \ --logtostderr=true \ --v=2 \ --runtime-cgroups=/systemd/system.slice \ --kubelet-cgroups=/systemd/system.slice #kubelet cAdvisor 默認在全部接口監聽 4194 端口的請求, 如下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