如何在dockerized Topbeat中监视主机的文件系统

我想用Elasticsearch Topbeat来监视我的主机。 但是，在Docker容器中运行Topbeat似乎容器看不到主机的FS，而只看到使用-volume运行选项安装的东西。 例如：

root$ df -h Filesystem Size Used Avail Use% Mounted on /dev/vda1 6.9G 2.0G 4.7G 30% / root$ docker run --name Topbeat --net host --pid host --dns=127.0.0.1 --volume /var/log:/var/log frg-topbeat:latest root$ docker exec -it Topbeat df -h Filesystem Size Used Avail Use% Mounted on none 6.9G 2.0G 4.7G 30% / tmpfs 501M 0 501M 0% /dev tmpfs 501M 0 501M 0% /sys/fs/cgroup /dev/vda1 6.9G 2.0G 4.7G 30% /var/log <-- I wanted to see the / mount point and not only /var/log shm 64M 0 64M 0% /dev/shm 

更新1：由Topbeat监控的所有FS来自“mount”命令：

 root$ docker exec -it Topbeat /bin/bash root@tst-rpx-master-0:/# mount ... /dev/vda1 on /var/log type ext3 (rw,relatime,errors=remount-ro,data=ordered) /dev/vda1 on /etc/resolv.conf type ext3 (rw,relatime,errors=remount-ro,data=ordered) /dev/vda1 on /etc/hostname type ext3 (rw,relatime,errors=remount-ro,data=ordered) /dev/vda1 on /etc/hosts type ext3 (rw,relatime,errors=remount-ro,data=ordered) ...