Kubernetes单节点离线安装

系统运维
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.confenvironment=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 listk8s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。

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