https://github.com/opencontainers/runc/pull/129#issuecomment-121682068

runc create ：

server listen on: /var/runtime-cc-runtime/moby/1a455f31e773c61dda2fe86ac4561ef2c5f2cefa85453bd19256426c7d51ec0a/notify.sock

client on :/run/systemd/notify ， send “MAINPID=%d”

runc init:

bind mount :
/var/runtime-cc-runtime/moby/1a455f31e773c61dda2fe86ac4561ef2c5f2cefa85453bd19256426c7d51ec0a/notify.sock

/run/systemd/notify