Kubernetes1.91（K8s）安装部署过程（五）--安装flannel网络插件

node节点需要安装flannel网络插件才能保证所有的pod在一个局域网内通信，直接使用yum安装即可，版本是0.7.1.

1、安装flannel插件：

注意是2个node节点都需要安装，都需要修改service文件和配置文件。

yum install  flannel -y

2、修改service文件/usr/lib/systemd/system/flanneld.service其内容为：

[Unit]

Description=Flanneld overlay address etcd agent

After=network.target

After=network-online.target

Wants=network-online.target

After=etcd.service

Before=docker.service

[Service]

Type=notify

EnvironmentFile=/etc/sysconfig/flanneld

EnvironmentFile=-/etc/sysconfig/docker-network

ExecStart=/usr/bin/flanneld-start \

  -etcd-endpoints=${FLANNEL_ETCD_ENDPOINTS} \

  -etcd-prefix=${FLANNEL_ETCD_PREFIX} \

  $FLANNEL_OPTIONS

ExecStartPost=/usr/libexec/flannel/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/docker

Restart=on-failure

[Install]

WantedBy=multi-user.target

RequiredBy=docker.service

提示:service文件中所有的变量参数都是读取相应的配置文件里面的，所有要保证前后对应。

修改其配置文件/etc/sysconfig/flanneld 内容如下：

# Flanneld configuration options  

# etcd url location.  Point this to the server where etcd runs

FLANNEL_ETCD_ENDPOINTS="https://10.10.90.105:2379,https://10.10.90.106:2379,https://10.10.90.107:2379"

# etcd config key.  This is the configuration key that flannel queries

# For address range assignment

#FLANNEL_ETCD_PREFIX="/atomic.io/network"

FLANNEL_ETCD_PREFIX="/kube-centos/network"

# Any additional options that you want to pass

#FLANNEL_OPTIONS=""

FLANNEL_OPTIONS="-etcd-cafile=/etc/kubernetes/ssl/ca.pem -etcd-certfile=/etc/kubernetes/ssl/kubernetes.pem -etcd-keyfile=/etc/kubernetes/ssl/kubernetes-key.pem"

以上2步是2个node节点都需要做的。

3、在etcd中常见网络配置信息

etcdctl --endpoints=https://10.10.90.105:2379,https://10.10.90.106:2379,https://10.10.90.107:2379 \

  --ca-file=/etc/kubernetes/ssl/ca.pem \

  --cert-file=/etc/kubernetes/ssl/kubernetes.pem \

  --key-file=/etc/kubernetes/ssl/kubernetes-key.pem \

  mkdir /kube-centos/network


#上下是2条命令，在任何节点上创建都行，因为etcd是集群的。

etcdctl --endpoints=https://10.10.90.105:2379,https://10.10.90.106:2379,https://10.10.90.107:2379 \

  --ca-file=/etc/kubernetes/ssl/ca.pem \

  --cert-file=/etc/kubernetes/ssl/kubernetes.pem \

  --key-file=/etc/kubernetes/ssl/kubernetes-key.pem \

  mk /kube-centos/network/config '{"Network":"172.30.0.0/16","SubnetLen":24,"Backend":{"Type":"host-gw"}}'

4、启动flannel服务

systemctl daemon-reload

systemctl enable flanneld

systemctl start flanneld

systemctl status flanneld

5、核对相关配置信息：

#先声明个endpoint变量，后边好调用
[root@c7test_node1 ~]#ETCD_ENDPOINTS='https://10.10.90.105:2379,https://10.10.90.106:2379,https://10.10.90.107:2379'

[root@c7test_node1 ~]# etcdctl --endpoints=${ETCD_ENDPOINTS} \

--ca-file=/etc/kubernetes/ssl/ca.pem \

--cert-file=/etc/kubernetes/ssl/kubernetes.pem \

--key-file=/etc/kubernetes/ssl/kubernetes-key.pem \

ls /kube-centos/network/subnets
#输出

/kube-centos/network/subnets/172.30.87.0-

/kube-centos/network/subnets/172.30.92.0-

#说明，有几个node就有几个子网络，就有几条记录，我是2个node，分别安装了flannel插件

[root@c7test_node1 ~]# etcdctl --endpoints=${ETCD_ENDPOINTS} \
--ca-file=/etc/kubernetes/ssl/ca.pem \
--cert-file=/etc/kubernetes/ssl/kubernetes.pem \
--key-file=/etc/kubernetes/ssl/kubernetes-key.pem \
get /kube-centos/network/config

#输出
{"Network":"172.30.0.0/16","SubnetLen":24,"Backend":{"Type":"host-gw"}}

#此处是查看主网络配置

etcdctl --endpoints=${ETCD_ENDPOINTS} --ca-file=/etc/kubernetes/ssl/ca.pem --cert-file=/etc/kubernetes/ssl/kubernetes.pem --key-file=/etc/kubernete s/ssl/kubernetes-key.pem get /kube-centos/network/subnets/172.30.92.0-24

#输出

{"PublicIP":"10.10.90.106","BackendType":"vxlan","BackendData":{"VtepMAC":"26:af:ac:26:47:ad"}}

#输出

{"PublicIP":"10.10.90.107","BackendType":"vxlan","BackendData":{"VtepMAC":"82:6f:58:94:9f:59"}}

如有以上输出即代表flannel插件安装配置成功，下一篇文章开始安装node节点。

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Kubernetes1.91（K8s）安装部署过程（五）--安装flannel网络插件

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