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Frakti
简介
Frakti是一个基于Kubelet CRI的运行时，它提供了hypervisor级别的隔离性，特别适用于运行不可信应用以及多租户场景下。Frakti实现了一个混合运行时：
- 特权容器以Docker container的方式运行
- 而普通容器则以hyper container的方法运行在VM内
Allinone安装方法
Frakti提供了一个简便的安装脚本，可以一键在Ubuntu或CentOS上启动一个本机的Kubernetes+frakti集群。
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curl -sSL https://github.com/kubernetes/frakti/raw/master/cluster/allinone.sh | bash
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集群部署
首先需要在所有机器上安装hyperd, docker, frakti, CNI 和 kubelet。
安装hyperd
Ubuntu 16.04+:
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apt-get update && apt-get install -y qemu libvirt-bin
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curl -sSL https://hypercontainer.io/install | bash
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CentOS 7:
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curl -sSL https://hypercontainer.io/install | bash
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配置hyperd:
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echo -e "Kernel=/var/lib/hyper/kernel\n\
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Initrd=/var/lib/hyper/hyper-initrd.img\n\
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Hypervisor=qemu\n\
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StorageDriver=overlay\n\
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gRPCHost=127.0.0.1:22318" > /etc/hyper/config
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systemctl enable hyperd
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systemctl restart hyperd
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安装docker
Ubuntu 16.04+:
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apt-get update
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apt-get install -y docker.io
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CentOS 7:
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yum install -y docker
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启动docker:
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systemctl enable docker
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systemctl start docker
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安装frakti
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curl -sSL https://github.com/kubernetes/frakti/releases/download/v0.2/frakti -o /usr/bin/frakti
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chmod +x /usr/bin/frakti
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cgroup_driver=$(docker info | awk '/Cgroup Driver/{print $3}')
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cat <<EOF > /lib/systemd/system/frakti.service
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[Unit]
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Description=Hypervisor-based container runtime for Kubernetes
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Documentation=https://github.com/kubernetes/frakti
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After=network.target
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[Service]
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ExecStart=/usr/bin/frakti --v=3 \
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--log-dir=/var/log/frakti \
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--logtostderr=false \
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--cgroup-driver=${cgroup_driver} \
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--listen=/var/run/frakti.sock \
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--streaming-server-addr=%H \
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--hyper-endpoint=127.0.0.1:22318
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MountFlags=shared
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TasksMax=8192
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LimitNOFILE=1048576
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LimitNPROC=1048576
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LimitCORE=infinity
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TimeoutStartSec=0
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Restart=on-abnormal
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[Install]
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WantedBy=multi-user.target
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EOF
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安装CNI
Ubuntu 16.04+:
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apt-get update && apt-get install -y apt-transport-https
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curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
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cat <<EOF > /etc/apt/sources.list.d/kubernetes.list
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deb http://apt.kubernetes.io/ kubernetes-xenial main
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EOF
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apt-get update
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apt-get install -y kubernetes-cni
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CentOS 7:
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cat <<EOF > /etc/yum.repos.d/kubernetes.repo
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[kubernetes]
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name=Kubernetes
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baseurl=http://yum.kubernetes.io/repos/kubernetes-el7-x86_64
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enabled=1
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gpgcheck=1
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repo_gpgcheck=1
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gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg
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https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
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EOF
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setenforce 0
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yum install -y kubernetes-cni
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配置CNI网络，注意
- frakti目前仅支持bridge插件
- 所有机器上Pod的子网不能相同，比如master上可以用
10.244.1.0/24，而第一个Node上可以用10.244.2.0/24
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mkdir -p /etc/cni/net.d
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cat >/etc/cni/net.d/10-mynet.conf <<-EOF
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{
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"cniVersion": "0.3.0",
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"name": "mynet",
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"type": "bridge",
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"bridge": "cni0",
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"isGateway": true,
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"ipMasq": true,
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"ipam": {
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"type": "host-local",
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"subnet": "10.244.1.0/24",
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"routes": [
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{ "dst": "0.0.0.0/0" }
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]
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}
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}
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EOF
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cat >/etc/cni/net.d/99-loopback.conf <<-EOF
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{
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"cniVersion": "0.3.0",
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"type": "loopback"
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}
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EOF
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安装Kubelet
Ubuntu 16.04+:
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apt-get install -y kubelet kubeadm kubectl
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CentOS 7:
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yum install -y kubelet kubeadm kubectl
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配置Kubelet使用frakti runtime:
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sed -i '2 i\Environment="KUBELET_EXTRA_ARGS=--container-runtime=remote --container-runtime-endpoint=/var/run/frakti.sock --feature-gates=AllAlpha=true"' /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
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systemctl daemon-reload
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配置Master
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kubeadm init kubeadm init --pod-network-cidr 10.244.0.0/16 --kubernetes-version latest
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# Optional: enable schedule pods on the master
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export KUBECONFIG=/etc/kubernetes/admin.conf
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kubectl taint nodes --all node-role.kubernetes.io/master:NoSchedule-
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配置Node
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# get token on master node
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token=$(kubeadm token list | grep authentication,signing | awk '{print $1}')
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# join master on worker nodes
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kubeadm join --token $token ${master_ip}
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配置CNI网络路由
在集群模式下，需要为容器网络配置直接路由，假设有一台master和两台Node：
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NODE IP_ADDRESS CONTAINER_CIDR
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master 10.140.0.1 10.244.1.0/24
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node-1 10.140.0.2 10.244.2.0/24
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node-2 10.140.0.3 10.244.3.0/24
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CNI的网络路由可以这么配置：
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# on master
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ip route add 10.244.2.0/24 via 10.140.0.2
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ip route add 10.244.3.0/24 via 10.140.0.3
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# on node-1
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ip route add 10.244.1.0/24 via 10.140.0.1
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ip route add 10.244.3.0/24 via 10.140.0.3
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# on node-2
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ip route add 10.244.1.0/24 via 10.140.0.1
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ip route add 10.244.2.0/24 via 10.140.0.2
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参考文档
最近更新 2yr ago