下载二进制包

# wget https://github.com/coreos/flannel/releases/download/v0.9.1/flannel-v0.9.1-linux-amd64.tar.gz

1、解压flannel-v0.9.1-linux-amd64.tar.gz

# tar -zxvf flannel-v0.9.1-linux-amd64.tar.gz

2、把安装包里面的flanneld、mk-docker-opts.sh复制到/opt/kubernetes/bin

# mv flanneld mk-docker-opts.sh /opt/kubernetes/bin

3、编写配置文件

#vim /opt/kubernetes/cfg/flanneld
FLANNEL_OPTIONS="--etcd-endpoints=https://192.168.1.20:2379,https://192.168.1.22:2379,https://192.168.1.23:2379 \
-etcd-cafile=/opt/kubernetes/ssl/ca.pem \
-etcd-certfile=/opt/kubernetes/ssl/server.pem \
-etcd-keyfile=/opt/kubernetes/ssl/server-key.pem"

4、设置启动systemctl管理flanneld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

5、设置启动systemctl管理docker文件(配置docker使用的网段和flanneld在同一个网段)

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

6、写入分配的子网段到etcd，供flanneld使用（master执行）(需要到/opt/kubernetes/ssl目录下执行这个命令)

/opt/kubernetes/bin/etcdctl \
--ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem \
--endpoints="https://192.168.1.20:2379,https://192.168.1.22:2379,https://192.168.1.23:2379" \
set /coreos.com/network/config '{ "Network": "172.17.0.0/16", "Backend": {"Type": "vxlan"}}'

查询配置信息

/opt/kubernetes/bin/etcdctl \
--ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem \
--endpoints="https://192.168.1.20:2379,https://192.168.1.22:2379,https://192.168.1.23:2379"  \
get /coreos.com/network/config 

列出配置信息

/opt/kubernetes/bin/etcdctl \
--ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem \
--endpoints="https://192.168.1.20:2379,https://192.168.1.22:2379,https://192.168.1.23:2379"  \
ls /coreos.com/network

7、重启docker和flanneld

systemctl restart docker
systemctl restart flanneld