Docker中的Cgroup Driver:Cgroupfs 与 Systemd

在安装kubernetes的过程中，会出现

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

文件驱动默认由systemd改成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

docker info查看

Cgroup Driver: systemd

现在有两种方式, 一种是修改docker, 另一种是修改kubelet,

修改docker:#

修改或创建/etc/docker/daemon.json，加入下面的内容：

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{ "exec-opts": ["native.cgroupdriver=systemd"] }

重启docker:

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systemctl restart docker systemctl status docker

修改kubelet:#

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vim /etc/systemd/system/kubelet.service.d/10-kubeadm.conf # Note: This dropin only works with kubeadm and kubelet v1.11+ [Service] Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf" Environment="KUBELET_CONFIG_ARGS=--config=/var/lib/kubelet/config.yaml" # This is a file that "kubeadm init" and "kubeadm join" generates at runtime, populating the KUBELET_KUBEADM_ARGS variable dynamically EnvironmentFile=-/var/lib/kubelet/kubeadm-flags.env # This is a file that the user can use for overrides of the kubelet args as a last resort. Preferably, the user should use # the .NodeRegistration.KubeletExtraArgs object in the configuration files instead. KUBELET_EXTRA_ARGS should be sourced from this file. EnvironmentFile=-/etc/sysconfig/kubelet ExecStart= ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS

添加如下内容--cgroup-driver=systemd

或者：

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# 配置kubelet使用国内pause镜像 # 配置kubelet的cgroups # 获取docker的cgroups $ DOCKER_CGROUPS=$(docker info | grep 'Cgroup' | cut -d' ' -f3) $ echo $DOCKER_CGROUPS $ cat >/etc/sysconfig/kubelet<<EOF KUBELET_CGROUP_ARGS="--cgroup-driver=$DOCKER_CGROUPS" KUBELET_EXTRA_ARGS="--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause-amd64:3.1" EOF # 启动 $ systemctl daemon-reload $ systemctl enable kubelet && systemctl restart kubelet

或者：

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DOCKER_CGROUPS=$(docker info | grep 'Cgroup' | cut -d' ' -f3) echo $DOCKER_CGROUPS cat >/etc/sysconfig/kubelet<<EOF KUBELET_EXTRA_ARGS="--cgroup-driver=$DOCKER_CGROUPS --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause-amd64:3.1" EOF # 启动 $ systemctl daemon-reload $ systemctl enable kubelet && systemctl restart kubelet