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entrypoint.sh: replace uses of rbd-fuse with rbd command line tool

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Replace uses of the rbd-fuse virtual file system with command line
invocations of `rbd import` and `rbd export`. This allows us to drop
the dependency on rbd-fuse (and fuse entirely, again). Fuse requires
additional privs and special stuff so not using it makes running the
container simpler and more secure.

The only downside that I see to this change is that `rbd import` refuses
to overwrite existing images. This means the logic of the setup
function needed to be slightly changed but I don't consider it all
that different.

I did also slightly decrease the size of the image to ~500K. I didn't
think we needed to be copying so much zeros over the wire nor did
mirroring a lot of zeros demonstrate much IMO.

Signed-off-by: John Mulligan <jmulligan@redhat.com>
This commit is contained in:
John Mulligan 2021-04-12 09:45:52 -04:00 committed by mergify[bot]
parent 312e4cf6b5
commit cf29cdbb27
1 changed files with 5 additions and 6 deletions
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11
entrypoint.sh
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@ -148,7 +148,10 @@ setup_mirroring() {
rbd -c $CONF_B mirror pool enable rbd image
rbd -c $CONF_A mirror pool peer bootstrap create --site-name ceph_a rbd > token
rbd -c $CONF_B mirror pool peer bootstrap import --site-name ceph_b rbd token
rbd -c $CONF_A create mirror_test --size 100M
rbd -c $CONF_A rm mirror_test 2>/dev/null || true
rbd -c $CONF_B rm mirror_test 2>/dev/null || true
(echo "Mirror Test"; dd if=/dev/zero bs=1 count=500K) | rbd -c $CONF_A import - mirror_test
rbd -c $CONF_A mirror image enable mirror_test snapshot
echo -n "Waiting for mirroring activation..."
while ! rbd -c $CONF_A mirror image status mirror_test \
@ -156,13 +159,9 @@ setup_mirroring() {
sleep 1
done
echo "done"
mkdir /mnt/images_a /mnt/images_b
rbd-fuse -c $CONF_A /mnt/images_a
rbd-fuse -c $CONF_B /mnt/images_b
echo "Mirror Test" | dd conv=notrunc bs=1 of=/mnt/images_a/mirror_test
rbd -c $CONF_A mirror image snapshot mirror_test
echo -n "Waiting for mirror sync..."
while ! dd bs=1 count=100 if=/mnt/images_b/mirror_test 2>/dev/null | grep -q "Mirror Test" ; do
while ! rbd -c $CONF_B export mirror_test - 2>/dev/null | grep -q "Mirror Test" ; do
sleep 1
done
echo " mirroring functional!"