flannel配置如何接入docker

1. flannel启动后会使用脚本生成网络相关配置信息

cat /usr/lib/systemd/system/flanneld.service
...
ExecStartPost=/usr/libexec/flannel/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/docker
...

2. docker启动时候引用此配置

# cat /usr/lib/systemd/system/docker.service.d/flannel.conf
[Service]
EnvironmentFile=-/run/flannel/docker

mk-docker-opts.sh