kubernetes集群二进制文件安装方式过程中，出现的异常汇总
异常【kubelet cgroup driver：cgroupfs跟docker cgroup driver：systemd不一致】
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异常描述
error: failed to run Kubelet: failed to create kubelet: misconfiguration: kubelet cgroup driver: "cgroupfs" is different from docker cgroup driver: "systemd"
启动kubelet时
#启动kubelet service kubelet start #查看kubelet日志 journalctl -f -u kubelet提示如下错误
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. -
原因分析
kubelet文件驱动默认cgroupfs, 而我们安装的docker使用的文件驱动是systemd, 造成不一致, 导致镜像无法启动。
现在有两种方式, 一种是修改docker, 另一种是修改kubelet。
我这里采用修改docker的方式
==注意==：
网上大部分教程都是说直接修改daemon.json#修改daemon.json vi /etc/docker/daemon.json #添加如下属性 "exec-opts": [ "native.cgroupdriver=systemd" ]这样会导致修改后，docker无法启动成功，提示
daemon.json与/lib/systemd/system/docker.service中native.cgroupdriver=systemd重复存在。 -
解决方案（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 \ 修改为： --exec-opt native.cgroupdriver=cgroupfs \# 重启docker systemctl daemon-reload systemctl restart docker# 修改后查看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 ...
异常【Failed to get system container stats for kubelet.service】
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异常描述
failed to get container info for "/system.slice/kubelet.service": unknown container "/system.slice/kubelet.service"
启动kubelet时
service kubelet start #查看kubelet日志 journalctl -f -u kubelet提示如下错误
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" -
解决方案
# 修改kubelet.service vi /lib/systemd/system/kubelet.service#在ExecStart位置最后面，添加如下配置 --runtime-cgroups=/systemd/system.slice \ --kubelet-cgroups=/systemd/system.slice修改后的/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 默认在所有接口监听 4194 端口的请求, 以下iptables限制内网访问 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
