OVN
- underlay：容器运行在虚拟机中，而ovs则运行在虚拟机所在的物理机上，OVN将容器网络和虚拟机网络连接在一起
- overlay：OVN通过logical overlay network连接所有节点的容器，此时ovs可以直接运行在物理机或虚拟机上
Overlay模式
配置master
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# start ovn
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/usr/share/openvswitch/scripts/ovn-ctl start_northd
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/usr/share/openvswitch/scripts/ovn-ctl start_controller
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# start ovnkube
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nohup sudo ovnkube -k8s-kubeconfig kubeconfig.yaml -net-controller \
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-loglevel=4 \
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-k8s-apiserver="http://$CENTRAL_IP:8080" \
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-logfile="/var/log/openvswitch/ovnkube.log" \
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-init-master=$NODE_NAME -cluster-subnet="$CLUSTER_IP_SUBNET" \
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-service-cluster-ip-range=$SERVICE_IP_SUBNET \
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-nodeport \
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-nb-address="tcp://$CENTRAL_IP:6631" \
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-sb-address="tcp://$CENTRAL_IP:6632" 2>&1 &
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配置Node
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nohup sudo ovnkube -k8s-kubeconfig kubeconfig.yaml -loglevel=4 \
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-logfile="/var/log/openvswitch/ovnkube.log" \
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-k8s-apiserver="http://$CENTRAL_IP:8080" \
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-init-node="$NODE_NAME" \
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-nodeport \
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-nb-address="tcp://$CENTRAL_IP:6631" \
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-sb-address="tcp://$CENTRAL_IP:6632" -k8s-token="$TOKEN" \
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-init-gateways \
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-service-cluster-ip-range=$SERVICE_IP_SUBNET \
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-cluster-subnet=$CLUSTER_IP_SUBNET 2>&1 &
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CNI插件原理
ADD操作
- 从
ovnannotation获取ip/mac/gateway - 在容器netns中配置接口和路由
- 添加ovs端口
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ovs-vsctl add-port br-int veth_outside \
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--set interface veth_outside \
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external_ids:attached_mac=mac_address \
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external_ids:iface-id=namespace_pod \
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external_ids:ip_address=ip_address
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DEL操作
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ovs-vsctl del-port br-int port
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Underlay模式
暂未实现。
OVN 安装方法
所有节点配置安装源并安装公共依赖
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sudo apt-get install apt-transport-https
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echo "deb https://packages.wand.net.nz $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/wand.list
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sudo curl https://packages.wand.net.nz/keyring.gpg -o /etc/apt/trusted.gpg.d/wand.gpg
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sudo apt-get update
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sudo apt-get build-dep dkms
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sudo apt-get install python-six openssl python-pip -y
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sudo -H pip install --upgrade pip
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sudo apt-get install openvswitch-datapath-dkms -y
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sudo apt-get install openvswitch-switch openvswitch-common -y
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sudo -H pip install ovs
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Master 节点安装 ovn-central
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sudo apt-get install ovn-central ovn-common ovn-host -y
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Node 节点安装 ovn-host
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sudo apt-get install ovn-host ovn-common -y
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