128 lines
4.8 KiB
Markdown
128 lines
4.8 KiB
Markdown
# 安装 flannel 网络插件
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所有的 node 节点都需要安装网络插件才能让所有的 Pod 加入到同一个局域网中，本文是安装 flannel 网络插件的参考文档。
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建议直接使用 yum 安装 flanneld，除非对版本有特殊需求，默认安装的是 0.7.1 版本的 flannel。
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```bash
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yum install -y flannel
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```
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service 配置文件 `/usr/lib/systemd/system/flanneld.service`。
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```ini
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[Unit]
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Description=Flanneld overlay address etcd agent
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After=network.target
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After=network-online.target
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Wants=network-online.target
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After=etcd.service
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Before=docker.service
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[Service]
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Type=notify
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EnvironmentFile=/etc/sysconfig/flanneld
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EnvironmentFile=-/etc/sysconfig/docker-network
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ExecStart=/usr/bin/flanneld-start \
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-etcd-endpoints=${FLANNEL_ETCD_ENDPOINTS} \
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-etcd-prefix=${FLANNEL_ETCD_PREFIX} \
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$FLANNEL_OPTIONS
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ExecStartPost=/usr/libexec/flannel/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/docker
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Restart=on-failure
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[Install]
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WantedBy=multi-user.target
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RequiredBy=docker.service
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```
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`/etc/sysconfig/flanneld` 配置文件：
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```ini
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# Flanneld configuration options
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# etcd url location. Point this to the server where etcd runs
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FLANNEL_ETCD_ENDPOINTS="https://172.20.0.113:2379,https://172.20.0.114:2379,https://172.20.0.115:2379"
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# etcd config key. This is the configuration key that flannel queries
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# For address range assignment
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FLANNEL_ETCD_PREFIX="/kube-centos/network"
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# Any additional options that you want to pass
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FLANNEL_OPTIONS="-etcd-cafile=/etc/kubernetes/ssl/ca.pem -etcd-certfile=/etc/kubernetes/ssl/kubernetes.pem -etcd-keyfile=/etc/kubernetes/ssl/kubernetes-key.pem"
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```
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如果是多网卡（例如 vagrant 环境），则需要在 FLANNEL_OPTIONS 中增加指定的外网出口的网卡，例如 - iface=eth2
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**在 etcd 中创建网络配置**
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执行下面的命令为 docker 分配 IP 地址段。
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```bash
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etcdctl --endpoints=https://172.20.0.113:2379,https://172.20.0.114:2379,https://172.20.0.115:2379 \
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--ca-file=/etc/kubernetes/ssl/ca.pem \
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--cert-file=/etc/kubernetes/ssl/kubernetes.pem \
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--key-file=/etc/kubernetes/ssl/kubernetes-key.pem \
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mkdir /kube-centos/network
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etcdctl --endpoints=https://172.20.0.113:2379,https://172.20.0.114:2379,https://172.20.0.115:2379 \
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--ca-file=/etc/kubernetes/ssl/ca.pem \
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--cert-file=/etc/kubernetes/ssl/kubernetes.pem \
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--key-file=/etc/kubernetes/ssl/kubernetes-key.pem \
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mk /kube-centos/network/config '{"Network":"172.30.0.0/16","SubnetLen":24,"Backend":{"Type":"vxlan"}}'
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```
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如果你要使用 `host-gw` 模式，可以直接将 vxlan 改成 `host-gw` 即可。
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**注**：参考[网络和集群性能测试](network-and-cluster-perfermance-test.md)那节，最终我们使用的 `host-gw` 模式，关于 flannel 支持的 backend 模式见 [GitHub](https://github.com/coreos/flannel/blob/master/Documentation/backends.md)。
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**启动 flannel**
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```bash
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systemctl daemon-reload
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systemctl enable flanneld
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systemctl start flanneld
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systemctl status flanneld
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```
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现在查询 etcd 中的内容可以看到：
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```bash
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$etcdctl --endpoints=${ETCD_ENDPOINTS} \
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--ca-file=/etc/kubernetes/ssl/ca.pem \
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--cert-file=/etc/kubernetes/ssl/kubernetes.pem \
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--key-file=/etc/kubernetes/ssl/kubernetes-key.pem \
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ls /kube-centos/network/subnets
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/kube-centos/network/subnets/172.30.14.0-24
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/kube-centos/network/subnets/172.30.38.0-24
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/kube-centos/network/subnets/172.30.46.0-24
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$etcdctl --endpoints=${ETCD_ENDPOINTS} \
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--ca-file=/etc/kubernetes/ssl/ca.pem \
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--cert-file=/etc/kubernetes/ssl/kubernetes.pem \
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--key-file=/etc/kubernetes/ssl/kubernetes-key.pem \
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get /kube-centos/network/config
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{ "Network": "172.30.0.0/16", "SubnetLen": 24, "Backend": { "Type": "vxlan" } }
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$etcdctl --endpoints=${ETCD_ENDPOINTS} \
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--ca-file=/etc/kubernetes/ssl/ca.pem \
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--cert-file=/etc/kubernetes/ssl/kubernetes.pem \
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--key-file=/etc/kubernetes/ssl/kubernetes-key.pem \
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get /kube-centos/network/subnets/172.30.14.0-24
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{"PublicIP":"172.20.0.114","BackendType":"vxlan","BackendData":{"VtepMAC":"56:27:7d:1c:08:22"}}
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$etcdctl --endpoints=${ETCD_ENDPOINTS} \
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--ca-file=/etc/kubernetes/ssl/ca.pem \
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--cert-file=/etc/kubernetes/ssl/kubernetes.pem \
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--key-file=/etc/kubernetes/ssl/kubernetes-key.pem \
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get /kube-centos/network/subnets/172.30.38.0-24
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{"PublicIP":"172.20.0.115","BackendType":"vxlan","BackendData":{"VtepMAC":"12:82:83:59:cf:b8"}}
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$etcdctl --endpoints=${ETCD_ENDPOINTS} \
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--ca-file=/etc/kubernetes/ssl/ca.pem \
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--cert-file=/etc/kubernetes/ssl/kubernetes.pem \
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--key-file=/etc/kubernetes/ssl/kubernetes-key.pem \
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get /kube-centos/network/subnets/172.30.46.0-24
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{"PublicIP":"172.20.0.113","BackendType":"vxlan","BackendData":{"VtepMAC":"e6:b2:fd:f6:66:96"}}
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```
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如果可以查看到以上内容证明 flannel 已经安装完成，下一步是在 node 节点上安装和配置 docker、kubelet、kube-proxy 等，请参考下一节[部署 node 节点](node-installation.md)。
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