ovn-kubernetes安裝指南
Master節點的安裝
1、首先在master節點安裝ovs和ovn:
#!/bin/bash sudo apt-get install openvswitch-common openvswitch-switch sudo apt-get install ovn-common ovn-central ovn-host
源文件參見我的github(下文同理):https://github.com/YaoZengzeng/scripts/blob/master/ovn-central.sh
2、下載並安裝ovn-kubernetes:
git clone https://github.com/openvswitch/ovn-kubernetes
cd ovn-kubernetes
pip install .
3、對ovn master節點進行初始化:
#!/bin/bash NODE_NAME= CENTRAL_IP= LOCAL_IP= CLUSTER_IP_SUBNET= MASTER_SWITCH_SUBNET= ovs-vsctl set Open_vSwitch . external_ids:ovn-remote="tcp:$CENTRAL_IP:6642" external_ids:ovn-nb="tcp:$CENTRAL_IP:6641" external_ids:ovn-encap-ip="$LOCAL_IP" external_ids:ovn-encap-type="geneve" ovs-vsctl set Open_vSwitch . external_ids:k8s-api-server="127.0.0.1:8080" ovn-k8s-overlay master-init --cluster-ip-subnet=$CLUSTER_IP_SUBNET --master-switch-subnet="$MASTER_SWITCH_SUBNET" --node-name="$NODE_NAME"
其中NODE_NAME為master節點的hostname,CENTRAL_IP和LOCAL_IP對於master節點是一樣的,都是master節點自身的IP地址,CLUSTER_IP_SUBNET為整個集群的子網範圍,例如192.168.0.0/16,而MASTER_SWITCH_SUBNET則為master節點上的pod能夠分配的子網範圍,例如192.168.1.0/24
源碼鏈接:https://github.com/YaoZengzeng/scripts/blob/master/ovn-k8s-master.sh
4、最開始我是使用kubeadm搭建k8s集群的,但是當通過http://127.0.0.1:8080訪問api server時會發現該端口並未打開,可能是kubeadm默認是不打開該端口的,因此只能使用手動方式搭建kubernetes。首先下載並安裝kubernetes:
#!/bin/bash # Install docker apt-get update apt-get install -y docker.io mkdir k8s cd k8s wget https://github.com/kubernetes/kubernetes/releases/download/v1.5.3/kubernetes.tar.gz tar xvzf kubernetes.tar.gz ./kubernetes/cluster/get-kube-binaries.sh mkdir server cd server tar xvzf ../kubernetes/server/kubernetes-server-linux-amd64.tar.gz cd kubernetes/server/bin cp kube-apiserver kube-controller-manager kube-scheduler kubelet kubectl /usr/bin # Install cni mkdir -p /opt/cni/bin && cd /opt/cni/bin wget https://github.com/containernetworking/cni/releases/download/v0.5.2/cni-amd64-v0.5.2.tgz tar xvzf cni-amd64-v0.5.2.tgz
源碼連接:https://github.com/YaoZengzeng/scripts/blob/master/k8s-download.sh
5、接著運行kubernetes的各個組件:
#!/bin/bash # On the master node, start etcd docker run --net=host --detach gcr.io/google_containers/etcd:2.0.12 /usr/local/bin/etcd --addr=127.0.0.1:4001 --bind-addr=0.0.0.0:4001 --data-dir=/var/etcd/data # install kube-apiserver nohup kube-apiserver --service-cluster-ip-range=192.168.200.0/24 --address=0.0.0.0 --etcd-servers=http://127.0.0.1:4001 --v=2 2>&1 > /dev/null & # install kube-controller-manager nohup kube-controller-manager --master=127.0.0.1:8080 --v=2 2>&1 > /dev/null & # install kube-scheduler nohup kube-scheduler --master=127.0.0.1:8080 --v=2 2>&1 > /dev/null &
源碼鏈接:https://github.com/YaoZengzeng/scripts/blob/master/k8s-master.sh
6、最後,啟動ovn-k8s-watcher對k8s apiserver進行同步:
#!/bin/bash ovn-k8s-watcher --overlay --pidfile --log-file -vfile:info -vconsole:emer --detach
源碼鏈接:https://github.com/YaoZengzeng/scripts/blob/master/ovn-k8s-watcher.sh
到此為止,master節點配置完成
Minion節點的安裝
1、首先在minion節點安裝ovs和ovn:
#!/bin/bash sudo apt-get install openvswitch-common openvswitch-switch sudo apt-get install ovn-common ovn-host
源碼鏈接:https://github.com/YaoZengzeng/scripts/blob/master/ovn-host.sh
2、下載並安裝ovn-kubernetes:
git clone https://github.com/openvswitch/ovn-kubernetes cd ovn-kubernetes pip install .
3、對ovn minion節點進行初始化:
#!/bin/bash NODE_NAME= CENTRAL_IP= LOCAL_IP= K8S_API_SERVER_IP= CLUSTER_IP_SUBNET= MINION_SWITCH_SUBNET= ovs-vsctl set Open_vSwitch . external_ids:ovn-remote="tcp:$CENTRAL_IP:6642" external_ids:ovn-nb="tcp:$CENTRAL_IP:6641" external_ids:ovn-encap-ip="$LOCAL_IP" external_ids:ovn-encap-type="geneve" ovs-vsctl set Open_vSwitch . external_ids:k8s-api-server="$K8S_API_SERVER_IP:8080" ovn-k8s-overlay minion-init --cluster-ip-subnet="$CLUSTER_IP_SUBNET" --minion-switch-subnet="$MINION_SWITCH_SUBNET" --node-name="$NODE_NAME"
NODE_NAME等變量和上文基本相同,其中LOCAL_IP是minion的IP地址,而CENTRAL_IP和K8S_API_SERVER_IP為master的IP地址
源碼鏈接:https://github.com/YaoZengzeng/scripts/blob/master/ovn-k8s-minion.sh
4、和Master部分的步驟4相同,下載並安裝kubernetes
5、運行kubernetes minion節點的組件,其實就是kubelet:
#!/bin/bash K8S_API_SERVER_IP= # Start kubelet nohup kubelet --api-servers=http://$K8S_API_SERVER_IP:8080 --v=2 --address=0.0.0.0 --enable-server=true --network-plugin=cni --network-plugin-dir=/etc/cni/net.d 2>&1 > /dev/null &
其中K8S_API_SERVER_IP變量為master節點的IP地址
源碼鏈接:https://github.com/YaoZengzeng/scripts/blob/master/k8s-minion.sh
到此為止,完成了ovn-kubernetes的安裝。不過我並沒有對gateway節點進行初始化,因為搭建的集群並不需要和外界進行通信。當然這部分內容也比較復雜,等我認真學習之後,再來繼續補充吧。
ovn-kubernetes安裝指南