Failure to create directory with GlusterFS 4.1

[djschaap]

I tried the current master branch (aeecbb6) on a simple Docker host with GlusterFS 4.1. It appears to be working EXCEPT when a non-existent subdirectory is specified. Did something change between GlusterFS 3.x and 4.1?

Volume persistence WORKS with a bare Gluster volume:

docker run -it --rm --volume-driver gluster1 -v gfs1:/data alpine

df /data
Filesystem           1K-blocks      Used Available Use% Mounted on
srv1:gfs1        14624768   2320512  12304256  16% /data

---

Using a subdir is SILENTLY BROKEN - all appears well until the container terminates and your "persistent" data is vaporized:

docker run -it --rm --volume-driver gluster1 -v gfs1/dir1:/data alpine

Evidence of a problem can be seen in "df" output: it returns an unexpected device (the filesystem of /var/lib/docker) instead of the GlusterFS device:

df /data
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/vg1-lv_docker
                     314394636    403180 313991456   0% /data

---

Specifying a subdir WORKS if it has already been created within the GlusterFS volume:

docker run -it --rm --volume-driver gluster1 -v gfs1/n:/data alpine

df /data
Filesystem           1K-blocks      Used Available Use% Mounted on
srv1:gfs1/n      14624768   2320512  12304256  16% /data

---

Install/version info

For this testing, the Docker host served as one of the two peers in the GlusterFS cluster.

docker plugin install --alias gluster1   trajano/glusterfs-volume-plugin \
  --grant-all-permissions --disable
docker plugin set gluster1 SERVERS=srv1,srv2
docker plugin enable gluster1

rpm -qa centos-release centos-release-gluster41 docker-ce glusterfs | sort
centos-release-7-6.1810.2.el7.centos.x86_64
centos-release-gluster41-1.0-3.el7.centos.noarch
docker-ce-18.09.6-3.el7.x86_64
glusterfs-4.1.8-1.el7.x86_64

sudo gluster volume list
gfs1