Docker Engine managed plugin to for RBD volumes.
This plugins is managed using Docker Engine plugin system. https://docs.docker.com/engine/extend/
- Docker >=1.13.1 (recommended)
- Ceph cluster
- Docker v2 plugin
- No external service dependencies other than Ceph.
LOG_LEVEL=[0:ErrorLevel; 1:WarnLevel; 2:InfoLevel; 3:DebugLevel] defaults to 0
RBD_CONF_DEVICE_MAP_ROOT="/dev/rbd"
RBD_CONF_POOL="ssd"
RBD_CONF_CLUSTER=ceph
RBD_CONF_KEYRING_USER=client.admin
RBD_CONF_NAMESPACE=""
Mount options defaults to "--options=noatime" (extended syntax with no spaces)
MOUNT_OPTIONS="--options=noatime"
VOLUME_FSTYPE="ext4"
VOLUME_MKFS_OPTIONS="-O mmp"
VOLUME_SIZE="512"
VOLUME_ORDER="22"
Alter the config defaults by passing the "conf_var=value" in the plugin install
:
docker plugin install wetopi/rbd \
--alias=wetopi/rbd \
LOG_LEVEL=1 \
RBD_CONF_POOL="ssd" \
RBD_CONF_CLUSTER=ceph \
RBD_CONF_KEYRING_USER=client.admin
Important: Ensure the rbd kernel module is loaded at boot time
echo "rbd" >> /etc/modules
fstype: optional, defauls to conf VOLUME_FSTYPE 'ext4'
mkfsOptions: optional, defaults to conf VOLUME_MKFS_OPTIONS value '-O mmp' (Multiple Mount Protection)
mountOptions: optional, defaults to conf MOUNT_OPTIONS value '--options=noatime'
size: optional, defaults to conf VOLUME_SIZE value 512 (512MB)
order: optional, defaults to conf VOLUME_ORDER value '22' (4KB Objects)
https://docs.docker.com/engine/reference/commandline/volume_create/
docker volume create -d wetopi/rbd -o size=206 my_rbd_volume
docker volume ls
DRIVER VOLUME NAME
local 069d59c79366294d07b9102dde97807aeaae49dc26bb9b79dd5b983f7041d069
local 11db1fa5ba70752101be90a80ee48f0282a22a3c8020c1042219ed1ed5cb0557
local 2d1f2a8fac147b7e7a6b95ca227eba2ff859325210c7280ccb73fd5beda6e67a
wetopi/rbd my_rbd_volume
docker run -it -v my_rbd_volume:/data --volume-driver=wetopi/rbd busybox sh
docker run -it -v $(docker volume create -d wetopi/rbd -o size=206):/data --volume-driver=wetopi/rbd -o size=206 busybox sh
NOTE: Docker 1.13.1 does not support volume opts on docker run or docker create
docker service create --replicas=1 \
--mount type=volume,source=my_rbd_volume,destination=/var/lib/mysql,volume-driver=wetopi/rbd \
mariadb:latest
docker service create --replicas=1 \
-e MYSQL_ROOT_PASSWORD=my-secret-pw \
--mount type=volume,destination=/var/lib/mysql,volume-driver=wetopi/rbd,volume-opt=size=512 \
mariadb:latest
docker plugin disable -f wetopi/rbd
docker plugin upgrade wetopi/rbd
Update setting [Optional]:
docker plugin set wetopi/rbd \
LOG_LEVEL=2 \
RBD_CONF_POOL="ssd" \
RBD_CONF_KEYRING_USER=client.admin
Enable the plugin:
docker plugin enable wetopi/rbd
-
WHEN docker plugin remove + install THEN containers running in plugins node lost their volumes SOLUTION restart node (swarm moves containers to another node + restart free up the Rbd mapped + mounted images)
-
WHEN using a client scoped to an rbd namespace, you are THEN unable to create volumes SOLUTION alter the cap of the client to allow it to read the rbd_info object in the pool default namespace
ceph auth caps client.docker-rbd mon 'allow profile rbd' osd 'allow r pool rbd object_prefix rbd_info, profile rbd pool=rbd namespace=testns'
docker plugin ls
ID NAME DESCRIPTION ENABLED
fff19fa9a622 wetopi/rbd:latest RBD plugin for Docker true
Find the full id:
docker-runc list | grep fff19fa9a622
Exec an interactive shell:
docker-runc exec -t fff19fa9a622885f5bcc30c0199046761825b037b25523540647b12ccf84403be bash
If this container is not running or restarting, then check your docker engine log i.e.
tail -f /var/log/upstart/docker
or its equivalent
journalctl -f -u docker.service
To verify if the plugin API socket that the docker daemon communicates with is responsive, use curl. In this example, we will make API calls from the docker host to volume and network plugins using curl to ensure that the plugin is listening on the said socket. For a well functioning plugin, these basic requests should work. Note that plugin sockets are available on the host under /var/run/docker/plugins/
curl -H "Content-Type: application/json" -XPOST -d '{}' --unix-socket /var/run/docker/plugins/546ac5b9043ce0f49552b14e9fb73dc78f1028d2da7e894ab599e6546566c0df/rbd.sock http:/VolumeDriver.List
{"Mountpoint":"","Err":"","Volumes":[{"Name":"rbd_test","Mountpoint":"","Status":null},{"Name":"demo_test","Mountpoint":"/mnt/volumes/demo_test","Status":null}],"Volume":null,"Capabilities":{"Scope":""}}
mod: Added rbd namespaces. mod: Moved volume defaults to config. mod: updated lib go-ceph to 0.26 (pacific, quincy, reef) mod: updated libs to minor and patch
mod: upgrade to ceph pacific
mod: Added CAP_NET_ADMIN to capabilities to let the driver create volumes in Ubuntu 20.04.2 and new kernels.
new: Support for Ceph Nautilus
Ceph 14.x, Nautilus, has many new features but notably some differences in its configuration format due to the v2 Messenger interface. This adds support for Ceph Nautilus, mostly by updating Golang dependencies but also by ensuring more recent Ceph binaries are included in the container. This also cleans up the Dockerfile(s) a bit to make this easier to update in the future.
fix: pass the cluster name to rbd invocations
new: mkfs now with options: mkfsOptions with default "-O mmp" new: mount now with options: default mountOptions "--options=noatime" mod: rbd watchers do not stop the image mount.
No more volume lock control neded: With the introduction of ext4 "Multiple Mount Protection" we can deal with the multi mounts in a more rational way (https://ext4.wiki.kernel.org/index.php/Ext4_Disk_Layout#Multiple_Mount_Protection). The usage of Watchers carries complex corner cases i.e. when after a crash ceph takes too much time blacklist osd nodes.
New:
- Removed Consul dependency: consul is no more needed. This new release gathers state asking rbd.
- RBD advisory locks thanks to rbd state watchers. A volume mount returns error if it has a watcher. Now it is not possible for a client to attach a volume that is already attached to another node.
Incompatible backwards changes:
- Rbd pool: is a plugin config param. (changed in order to avoid the need to persist state of volumes).
- Rbd pool: is no more an option during volume create.
- POST /VolumeDriver.Create gives err if volume exists.
- POST /VolumeDriver.Mount gives err if volume has watchers.
You can build and publish the plugin with:
make all
Vendor dir is maintained using go mod
Update All dependencies to latest Minor or Patch versions:
go get -u
go mod tidy
https://github.com/docker/go-plugins-helpers
https://github.com/yp-engineering/rbd-docker-plugin
MIT