[lxc-devel] lxc-stop: umount issue?

[Harald Dunkel]

Hi Christian,

On 12/11/17 4:17 PM, Christian Brauner wrote:
> 
> What is the container's config file? liblxc itself does not know what
> drbd devices are and cannot create such containers. So I expect your
> container's config file to contain a line like:
> 
> lxc.rootfs = /data1/<container-name>/rootfs
> 

Here is a sample config file:

lxc.network.type = veth
lxc.network.link = br5
lxc.network.flags = up
lxc.network.hwaddr = 00:16:66:bd:77:7b
lxc.network.ipv4 = 192.168.142.xxx/26
lxc.network.ipv4.gateway = 192.168.142.yyy
lxc.network.type = veth
lxc.network.link = br4
lxc.network.flags = up
lxc.network.hwaddr = 00:16:49:2f:f3:ae
lxc.network.ipv4 = 10.111.111.xxx/24
lxc.rootfs = /data2/lxc/lxc01/rootfs
lxc.rootfs.backend = dir

# Common configuration
lxc.include = /usr/share/lxc/config/debian.common.conf

# Container specific configuration
lxc.mount = /data2/lxc/lxc01/fstab
lxc.tty = 4
lxc.utsname = lxc01
lxc.arch = amd64
lxc.start.auto = 1
lxc.group = auto

The fstab file is empty.

> without a storage type prefix and without lxc.rootfs.backend (for old
> liblxc versions) set. In this case liblxc will use the dir storage
> driver. So liblxc itself should never try to unmount anything on the
> host on shutdown especially not /data1. The only interesting thing
> liblxc does when the dir storage driver is used is to give itself a bind
> mount for the root filesystem in the container's mount namespace. Are
> you using any ({post-}stop) hooks?
> 

No hooks, AFAICT. What about all these /proc and /sys filesystems,
tmpfs and all that other stuff? Inside the container (config file
shown above) I see

# cat /proc/self/mounts
/dev/drbd2 / ext4 rw,noatime,stripe=256,data=ordered 0 0
none /dev tmpfs rw,relatime,size=492k,mode=755 0 0
proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
proc /proc/sys/net proc rw,nosuid,nodev,noexec,relatime 0 0
proc /proc/sys proc ro,nosuid,nodev,noexec,relatime 0 0
proc /proc/sysrq-trigger proc ro,nosuid,nodev,noexec,relatime 0 0
sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
sysfs /sys sysfs ro,nosuid,nodev,noexec,relatime 0 0
sysfs /sys/devices/virtual/net sysfs rw,relatime 0 0
sysfs /sys/devices/virtual/net sysfs rw,nosuid,nodev,noexec,relatime 0 0
fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
devpts /dev/console devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
devpts /dev/pts devpts rw,relatime,gid=5,mode=620,ptmxmode=666 0 0
devpts /dev/ptmx devpts rw,relatime,gid=5,mode=620,ptmxmode=666 0 0
devpts /dev/tty1 devpts rw,relatime,gid=5,mode=620,ptmxmode=666 0 0
devpts /dev/tty2 devpts rw,relatime,gid=5,mode=620,ptmxmode=666 0 0
devpts /dev/tty3 devpts rw,relatime,gid=5,mode=620,ptmxmode=666 0 0
devpts /dev/tty4 devpts rw,relatime,gid=5,mode=620,ptmxmode=666 0 0
tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0
tmpfs /run tmpfs rw,nosuid,nodev,mode=755 0 0
tmpfs /run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k 0 0
tmpfs /sys/fs/cgroup tmpfs ro,nosuid,nodev,noexec,mode=755 0 0
cgroup /sys/fs/cgroup/systemd cgroup rw,nosuid,nodev,noexec,relatime,release_agent=/run/cgmanager/agents/cgm-release-agent.systemd,name=systemd 0 0
cgroup /sys/fs/cgroup/cpuset cgroup rw,nosuid,nodev,noexec,relatime,cpuset,release_agent=/run/cgmanager/agents/cgm-release-agent.cpuset,clone_children 0 0
cgroup /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio,release_agent=/run/cgmanager/agents/cgm-release-agent.blkio 0 0
cgroup /sys/fs/cgroup/memory cgroup rw,nosuid,nodev,noexec,relatime,memory,release_agent=/run/cgmanager/agents/cgm-release-agent.memory 0 0
cgroup /sys/fs/cgroup/devices cgroup rw,nosuid,nodev,noexec,relatime,devices,release_agent=/run/cgmanager/agents/cgm-release-agent.devices 0 0
cgroup /sys/fs/cgroup/freezer cgroup rw,nosuid,nodev,noexec,relatime,freezer,release_agent=/run/cgmanager/agents/cgm-release-agent.freezer 0 0
cgroup /sys/fs/cgroup/perf_event cgroup rw,nosuid,nodev,noexec,relatime,perf_event,release_agent=/run/cgmanager/agents/cgm-release-agent.perf_event 0 0
cgroup /sys/fs/cgroup/pids cgroup rw,nosuid,nodev,noexec,relatime,pids,release_agent=/run/cgmanager/agents/cgm-release-agent.pids 0 0
hugetlbfs /dev/hugepages hugetlbfs rw,relatime 0 0
mqueue /dev/mqueue mqueue rw,relatime 0 0
tmpfs /run/user/402 tmpfs rw,nosuid,nodev,relatime,size=26406048k,mode=700,uid=402,gid=402 0 0
tmpfs /run/user/0 tmpfs rw,nosuid,nodev,relatime,size=26406048k,mode=700 0 0


Does this look OK?


Regards
Harri