Kubernetes多master部署（4）---部署Flannel网络

包：flannel-v0.10.0-linux-amd64.tar.gz，具体版本自己网上可以选择下载：https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz

将解压后得到的可执行文件放入我们之定义的路径下面

cp flanneld mk-docker-opts.sh /opt/kubernetes/bin/

配置配置文件：

#写flanneld配置文件
cat <<EOF >/opt/kubernetes/cfg/flanneld

FLANNEL_OPTIONS="--etcd-endpoints=https://10.50.182.65:2379,https://10.50.182.66:2379,https://10.50.182.67:2379 
-etcd-cafile=/opt/kubernetes/ssl/ca.pem 
-etcd-certfile=/opt/kubernetes/ssl/server.pem 
-etcd-keyfile=/opt/kubernetes/ssl/server-key.pem"

EOF

#写入 flanneld系统配置文件
cat <<EOF >/usr/lib/systemd/system/flanneld.service
[Unit]
Description=Flanneld overlay address etcd agent
After=network-online.target network.target
Before=docker.service

[Service]
Type=notify
EnvironmentFile=/opt/kubernetes/cfg/flanneld
ExecStart=/opt/kubernetes/bin/flanneld --ip-masq $FLANNEL_OPTIONS
ExecStartPost=/opt/kubernetes/bin/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/subnet.env
Restart=on-failure

[Install]
WantedBy=multi-user.target

EOF

#写入分配的子网段到etcd，供flanneld使用
cd /opt/kubernetes/ssl

/opt/kubernetes/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem --endpoints="https://10.50.182.65:2379,https://10.50.182.66:2379,https://10.50.182.67:2379" set /coreos.com/network/config '{ "Network": "10.147.224.0/20", "Backend": {"Type": "vxlan"}}'

启动Flannel，日志在/var/log/messages：

systemctl enable flanneld
systemctl start flanneld

查看flanneld分配的网络：

cat /run/flannel/subnet.env

编辑docker系统配置文件：

cat <<EOF >/usr/lib/systemd/system/docker.service

[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target

[Service]
Type=notify
EnvironmentFile=/run/flannel/subnet.env
ExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONS
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TimeoutStartSec=0
Delegate=yes
KillMode=process
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s

[Install]
WantedBy=multi-user.target

EOF

systemctl daemon-reload
systemctl restart docker

查看ifconfig 中 会出现一个flannel 网络，并且flannel和docker0 网络段会相同

设置完成后将配置文件分发到master02和master03

 scp -P 10022 jyapp@10.50.182.65:/opt/kubernetes/cfg/flanneld /opt/kubernetes/cfg/
 scp -P 10022 jyapp@10.50.182.65:/usr/lib/systemd/system/flanneld.service /usr/lib/systemd/system/
 scp -P 10022 jyapp@10.50.182.65:/opt/kubernetes/bin/flanneld /opt/kubernetes/bin/

master02和maser03上修改成和master01一致

systemctl daemon-reload
systemctl enable flanneld
systemctl start flanneld
systemctl restart docker

查看ifconfig 是否有flanneld，docker0网络是否和flanneld一致，
在master上ping node02上的docker0网关，如果能通的话证明Ok