我使用 docker 创建一个容器。当我进入容器时,我看不到过载相关的挂载。这个是正常的,
root@django-work:~/test# docker run -it ubuntu /bin/bash
root@52110483ac09:/# df -h
Filesystem Size Used Avail Use% Mounted on
overlay 49G 17G 30G 36% /
tmpfs 64M 0 64M 0% /dev
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
shm 64M 0 64M 0% /dev/shm
/dev/sda3 49G 17G 30G 36% /etc/hosts
tmpfs 3.9G 0 3.9G 0% /proc/asound
tmpfs 3.9G 0 3.9G 0% /proc/acpi
tmpfs 3.9G 0 3.9G 0% /proc/scsi
tmpfs 3.9G 0 3.9G 0% /sys/firmware
root@52110483ac09:/#
但是为什么我通过unshare创建PID命名空间和挂载命名空间的时候能看到完整的挂载信息
root@django-work:~# df -h
tmpfs 793M 2.0M 791M 1% /run
/dev/sda3 49G 17G 30G 36% /
tmpfs 3.9G 32M 3.9G 1% /dev/shm
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 4.0M 0 4.0M 0% /sys/fs/cgroup
/dev/sda2 512M 5.3M 507M 2% /boot/efi
tmpfs 793M 5.8M 787M 1% /run/user/1000
overlay 49G 17G 30G 36% /var/lib/docker/overlay2/dddc4d45086e3b814fe5589af09becc35cfa7cf4cce1a8fc82a930fba94a70ed/merged
root@django-work:~# unshare --pid --fork --mount-proc /bin/bash
root@django-work:~# df -h
/dev/sda3 49G 17G 30G 36% /
tmpfs 3.9G 32M 3.9G 1% /dev/shm
tmpfs 793M 2.0M 791M 1% /run
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 793M 5.8M 787M 1% /run/user/1000
tmpfs 4.0M 0 4.0M 0% /sys/fs/cgroup
/dev/sda2 512M 5.3M 507M 2% /boot/efi
overlay 49G 17G 30G 36% /var/lib/docker/overlay2/dddc4d45086e3b814fe5589af09becc35cfa7cf4cce1a8fc82a930fba94a70ed/merged
root@django-work:~#