1.为Flannel生成证书

[root@linux-node1 ~]# vim flanneld-csr.json

{

  "CN": "flanneld",

  "hosts": [],

  "key": {

    "algo": "rsa",

    "size": 2048

  },

  "names": [

    {

      "C": "CN",

      "ST": "BeiJing",

      "L": "BeiJing",

      "O": "k8s",

      "OU": "System"

    }

  ]

}

2.生成证书

[root@linux-node1 ~]# cfssl gencert -ca=/opt/kubernetes/ssl/ca.pem \

   -ca-key=/opt/kubernetes/ssl/ca-key.pem \

   -config=/opt/kubernetes/ssl/ca-config.json \

   -profile=kubernetes flanneld-csr.json | cfssljson -bare flanneld

3.分发证书

[root@linux-node1 ~]# cp flanneld*.pem /opt/kubernetes/ssl/

[root@linux-node1 ~]# scp flanneld*.pem 192.168.56.12:/opt/kubernetes/ssl/

[root@linux-node1 ~]# scp flanneld*.pem 192.168.56.13:/opt/kubernetes/ssl/

4.下载Flannel软件包

[root@linux-node1 ~]# cd /usr/local/src

# wget

 https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz

[root@linux-node1 src]# tar zxf flannel-v0.10.0-linux-amd64.tar.gz

[root@linux-node1 src]# cp flanneld mk-docker-opts.sh /opt/kubernetes/bin/

复制到linux-node2节点

[root@linux-node1 src]# scp flanneld mk-docker-opts.sh 192.168.56.12:/opt/kubernetes/bin/

[root@linux-node1 src]# scp flanneld mk-docker-opts.sh 192.168.56.13:/opt/kubernetes/bin/

复制对应脚本到/opt/kubernetes/bin目录下。

[root@linux-node1 ~]# cd /usr/local/src/kubernetes/cluster/centos/node/bin/

[root@linux-node1 bin]# cp remove-docker0.sh /opt/kubernetes/bin/

[root@linux-node1 bin]# scp remove-docker0.sh 192.168.56.12:/opt/kubernetes/bin/

[root@linux-node1 bin]# scp remove-docker0.sh 192.168.56.13:/opt/kubernetes/bin/

5.配置Flannel

[root@linux-node1 ~]# vim /opt/kubernetes/cfg/flannel

FLANNEL_ETCD="-etcd-endpoints=https://192.168.56.11:2379,https://192.168.56.12:2379,https://192.168.56.13:2379"

FLANNEL_ETCD_KEY="-etcd-prefix=/kubernetes/network"

FLANNEL_ETCD_CAFILE="--etcd-cafile=/opt/kubernetes/ssl/ca.pem"

FLANNEL_ETCD_CERTFILE="--etcd-certfile=/opt/kubernetes/ssl/flanneld.pem"

FLANNEL_ETCD_KEYFILE="--etcd-keyfile=/opt/kubernetes/ssl/flanneld-key.pem"

复制配置到其它节点上

[root@linux-node1 ~]# scp /opt/kubernetes/cfg/flannel 192.168.56.12:/opt/kubernetes/cfg/

[root@linux-node1 ~]# scp /opt/kubernetes/cfg/flannel 192.168.56.13:/opt/kubernetes/cfg/

6.设置Flannel系统服务

[root@linux-node1 ~]# vim /usr/lib/systemd/system/flannel.service

[Unit]

Description=Flanneld overlay address etcd agent

After=network.target

Before=docker.service

[Service]

EnvironmentFile=-/opt/kubernetes/cfg/flannel

ExecStartPre=/opt/kubernetes/bin/remove-docker0.sh

ExecStart=/opt/kubernetes/bin/flanneld --ip-masq ${FLANNEL_ETCD} ${FLANNEL_ETCD_KEY} ${FLANNEL_ETCD_CAFILE} ${FLANNEL_ETCD_CERTFILE} ${FLANNEL_ETCD_KEYFILE}

ExecStartPost=/opt/kubernetes/bin/mk-docker-opts.sh -d /run/flannel/docker

Type=notify

[Install]

WantedBy=multi-user.target

RequiredBy=docker.service

复制系统服务脚本到其它节点上

# scp /usr/lib/systemd/system/flannel.service 192.168.56.12:/usr/lib/systemd/system/

# scp /usr/lib/systemd/system/flannel.service 192.168.56.13:/usr/lib/systemd/system/

Flannel CNI集成

下载CNI插件

https://github.com/containernetworking/plugins/releases

wget https://github.com/containernetworking/plugins/releases/download/v0.7.1/cni-plugins-amd64-v0.7.1.tgz

[root@linux-node1 ~]# mkdir /opt/kubernetes/bin/cni

[root@linux-node1 src]# tar zxf cni-plugins-amd64-v0.7.1.tgz -C /opt/kubernetes/bin/cni

# scp -r /opt/kubernetes/bin/cni/* 192.168.56.12:/opt/kubernetes/bin/cni/

# scp -r /opt/kubernetes/bin/cni/* 192.168.56.13:/opt/kubernetes/bin/cni/

创建Etcd的key

/opt/kubernetes/bin/etcdctl --ca-file /opt/kubernetes/ssl/ca.pem --cert-file /opt/kubernetes/ssl/flanneld.pem --key-file /opt/kubernetes/ssl/flanneld-key.pem \

      --no-sync -C https://192.168.56.11:2379,https://192.168.56.12:2379,https://192.168.56.13:2379 \

mk /kubernetes/network/config '{ "Network": "10.2.0.0/16", "Backend": { "Type": "vxlan", "VNI": 1 }}' >/dev/null 2>&1

启动flannel

[root@linux-node1 ~]# systemctl daemon-reload

[root@linux-node1 ~]# systemctl enable flannel

[root@linux-node1 ~]# chmod +x /opt/kubernetes/bin/*

[root@linux-node1 ~]# systemctl start flannel

查看服务状态

[root@linux-node1 ~]# systemctl status flannel

配置Docker使用Flannel

[root@linux-node1 ~]# vim /usr/lib/systemd/system/docker.service

[Unit] #在Unit下面修改After和增加Requires

After=network-online.target firewalld.service flannel.service

Wants=network-online.target

Requires=flannel.service

[Service] #增加EnvironmentFile=-/run/flannel/docker

Type=notify

EnvironmentFile=-/run/flannel/docker

ExecStart=/usr/bin/dockerd $DOCKER_OPTS

将配置复制到另外两个阶段

# scp /usr/lib/systemd/system/docker.service 192.168.56.12:/usr/lib/systemd/system/

# scp /usr/lib/systemd/system/docker.service 192.168.56.13:/usr/lib/systemd/system/

重启Docker

[root@linux-node1 ~]# systemctl daemon-reload

[root@linux-node1 ~]# systemctl restart docker