- 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
...
- 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