Kubernetes单节点离线安装

由于各种各样的原因，你可能需要离线安装，至于为什么不是通过apt或者yum安装，这个原因就看具体情况了。

这里主要指rpm包的操作系统，比如centos, fedora之类的。

环境

环境说明

这里安装v1.14.1版本的kubernetes, cni选择flannel.

安装系统依赖

yum install conntrack-tools socat ebtables

系统环境配置

groupadd dockeruseradd -g docker docker

可能的配置/etc/default/grub -> GRUB_CMDLINE_LINUX_DEFAULT

cgroup_enable=memory swapaccount=1

取消swap

编辑/etc/fstab, 将含有swap字段的那行注释掉

最后重启

下载相关文件

下载kubeadm,kubectl, kubelet, kubernetes-cni, docker-ce, kube-flannel.yml

curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.14.1/bin/linux/amd64/kubeadmcurl -LO https://storage.googleapis.com/kubernetes-release/release/v1.14.1/bin/linux/amd64/kubeletcurl -LO https://storage.googleapis.com/kubernetes-release/release/v1.14.1/bin/linux/amd64/kubectlcurl -LO https://download.docker.com/linux/static/stable/x86_64/docker-18.06.3-ce.tgzcurl -LO https://github.com/containernetworking/plugins/releases/download/v0.8.2/cni-plugins-linux-amd64-v0.8.2.tgzcurl -LO https://raw.githubusercontent.com/coreos/flannel/62e44c867a2846fefb68bd5f178daf4da3095ccb/Documentation/kube-flannel.yml

安装

kubernetes相关命令

chmod +x kube*mv kube* /usr/local/bin/mkdir -p /opt/cni/bintar xf cni-plugins-linux-amd64-v0.8.2.tgz -C /opt/cni/bin

配置kubelet服务

cat > /usr/lib/systemd/system/kubelet.service  << EOF[Unit]Description=kubelet: The Kubernetes Node AgentDocumentation=https://kubernetes.io/docs/[Service]ExecStart=/usr/local/bin/kubeletRestart=alwaysStartLimitInterval=0RestartSec=10[Install]WantedBy=multi-user.targetEOF

配置kubeadm环境变量

cat > /etc/systemd/system/kubelet.service.d/10-kubeadm.conf << EOF# 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 dynamicallyEnvironmentFile=-/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/kubeletExecStart=ExecStart=/usr/local/bin/kubelet \$KUBELET_KUBECONFIG_ARGS \$KUBELET_CONFIG_ARGS \$KUBELET_KUBEADM_ARGS \$KUBELET_EXTRA_ARGSEOF

让kublet服务随系统启动

systemctl enable kubelet

安装docker

tar xf docker-17.09.1-ce.tgzmv docker/* /usr/local/bin/

配置docker服务

cat > /usr/lib/systemd/system/docker.service [Unit]Description=docker: docker[Service]ExecStart=/usr/local/bin/dockerdRestart=alwaysStartLimitInterval=0RestartSec=10[Install]WantedBy=multi-user.target

启动docker服务并随系统启动

systemctl enable dockersystemctl start docker

通过docker pull 命令下载以下docker镜像:

k8s.gcr.io/kube-apiserver:v1.14.1k8s.gcr.io/kube-controller-manager:v1.14.1k8s.gcr.io/kube-scheduler:v1.14.1k8s.gcr.io/kube-proxy:v1.14.1k8s.gcr.io/pause:3.1k8s.gcr.io/etcd:3.3.10k8s.gcr.io/coredns:1.3.1https://raw.githubusercontent.com/coreos/flannel/62e44c867a2846fefb68bd5f178daf4da3095ccb/Documentation/kube-flannel.ymlquay.io/coreos/flannel:v0.11.0-amd64

这些相关镜像版本可以通过以下命令列出,

kubeadm config images list

k8s集群初始化

kubeadm init -v=8 --alsologtostderr

配置自己的admin.conf

mkdir -p $HOME/.kubecp -i /etc/kubernetes/admin.comf $HOME/.kube

让自身可调度
kubectl taint node hostname node-role.kubernetes.io/master=-

配置pod cidr网络
编辑/etc/kubernetes/manifests/kube-controller-manager.yaml文件, 在command那项加入

--allocate-node-cidrs=true--cluster-cidr=10.244.0.0/16

重启kubelet

systemctl restart kubelet

安装cni

kubectl apply -f kube-flannel.yml

至此就完成了

最后的说明

纯粹记录，如果按照文档装不上或者某些命令式很正常的。