运行 docker stats 时，我看到：
CONTAINER CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O PIDS
11e22031f0be -- -- / -- -- -- / -- -- / -- --
f55b3bbf6115 0.00% 26.98 MiB / 7.795 GiB 0.34% 0 B / 0 B 6.728 MB / 0 B 2
ff7800652fa1 0.30% 21.61 MiB / 7.795 GiB 0.27% 0 B / 0 B 16.69 MB / 270.2 MB 9
d422fe2d0f1a 0.12% 14.23 MiB / 7.795 GiB 0.18% 0 B / 0 B 7.055 MB / 0 B 5
86df65e7c195 0.04% 6.141 MiB / 7.795 GiB 0.08% 0 B / 0 B 6.192 MB / 0 B 2
1d0c20d5ea48 0.27% 32.51 MiB / 7.795 GiB 0.41% 0 B / 0 B 23.48 MB / 0 B 11
--
有谁知道 -- 表示什么？容器正在运行，我可以使用 top 查看每个进程的非零统计信息。-- 是什么意思？
docker ps 的结果
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
11e22031f0be aaaaaaaaaaa "run master" 28 hours ago Up 28 hours agitated_bhaskara
f55b3bbf6115 bbbbbbbbb "run ovn-controller" 28 hours ago Up 28 hours ovn-controller
ff7800652fa1 quay.io/coreos/etcd:v3.0.2 "/usr/local/bin/etcd " 28 hours ago Up 28 hours etcd
d422fe2d0f1a ccccc/ovs "run ovs-vswitchd" 28 hours ago Up 28 hours ovs-vswitchd
86df65e7c195 ddddd/ovs "run ovsdb-server" 28 hours ago Up 28 hours ovsdb-server
1d0c20d5ea48 eeeeeeeeeeeeeeee "abcde minino" 28 hours ago Up 28 hours minion