drive format=raw,id=rbd1,file=/dev/rbd0,if=none \ Now you can access the image via /dev/rbd0 device. testpool/testimage, you can map the image via rbd map testimage -p testpool. The default value of pool-name is rbd.įor example, if you created a RBD image via rbd create -size. if IP addresses of monitors are not given, rbd infers it using /etc/ceph/nf (in the previous setup, we configured /etc/ceph/nf with mon_host value). Using krbd kernel moduleįollowing this step, map the image to a block device: rbd map Īll arguments except image-name are optional. You can use krbd kernel module or librbd userspace library to use the RBD image. You can use this image as a storage backend of a QEMU VM. Using Ceph RBD for QEMU VM Storage ( virtio) If want to list images in a specific pool, append the poolname.įeatures: layering, exclusive-lock, object-map, fast-diff, deep-flattenĬreate_timestamp: Thu Mar 4 16:09:01 2021Īccess_timestamp: Thu Mar 4 16:09:01 2021 You can get information of the create image via: application rbd # /įor example, rbd create -size 2048 testpool/testimage creates a 2GB block device image named testimage in testpool pool. To check it, type: $ ceph osd pool ls detail Then, use the rbd tool to initialize the pool for use by RBD 4: $ rbd pool init It was supposed to reload monitor daemons after adding the configuration mon_allow_pool_delete in /etc/ceph/nf configuration file, but this injectargs subcommand enables runtime argument injection. Just in case… you need to set mon_allow_pool_delete config option to true to delete a pool, with the following commands 5: ceph tell mon.* injectargs -mon_allow_pool_delete true
To create a RBD, you first need to create a pool, as all RBDs should be assigned into a pool.įollow 4 and 3 to create a pool and a RBD: $ ceph osd pool create testpool All commands are executed in a Ceph client node. You can see all authentication keyrings by using ceph auth ls command.ĭo not use admin keyring in public clusters.įrom here, Ceph hosts are no longer required. ceph automatically searches keyrings in /etc/ceph directory. The file should be located /etc/ceph/, or /etc/ceph/, if you created a new user. # copy file to /etc/ceph of the client node. This post just uses the admin user to access the cluster for simplicity: # on the host node
Most Ceph clusters are run with authentication enabled, and the client will need keys in order to communicate with cluster machines.įor better security, we could create a new user with less privilege and use this credential, following this manual 2.
Run the following command in the host: $ ceph config generate-minimal-confĬopy the 4 lines and paste it into /etc/ceph/nf on the client node: # on the client node
Install Ceph client packageĪll you need to install for a client node is ceph-common: $ apt install ceph-common This step requires an access permission to a host a host refers to a node that is already configured as a client or running a cluster daemon. Setting a Ceph client Configuration 1įor a node to access a Ceph cluster, it requires some configuration: We can attach a Ceph RBD to a QEMU VM through either virtio-blk or vhost-user-blk QEMU device ( vhost requires SPDK).Īssume that a Ceph cluster is ready following the manual. MyOS boots whithout any problems.This post explains how we can use a Ceph RBD as a QEMU storage. The funny thing is that if I use the following command: sudo qemu-system-x86_64 -hda /dev/loop2p1 -enable-kvm Using the virtual disk image: qemu-system-x86_64 -hda.
Manage Flags (partition one) -> boot, ESPīurn the OS iso image on partition #1: dd if=./myOS.iso of=/dev/loop2p1 bs=1M #the myOS is GRUB compatible Create partition #2 -> Fat32, 511MiB -> /dev/loop2p2 Create partition #1 -> Fat32, 512MiB -> /dev/loop2p1 (this one would be my bootable partition) Sudo losetup -partscan -show -find VirtualDisk.img -> bind VirtualDisk.img with /dev/loop2 deviceĬreating partitions using the GParted tool: sudo gparted /dev/loop2 Here is what I try to do: Creating virtual disk image: dd if=/dev/null of=./VirtualDisk.img bs=1M seek=1024 I want to create a virtual disk using dd command and then make different partitions for it using gparted tool and finally install my OS on one partition (#1) and use qemu to boot up the whole virtual disk image. I searched everywhere and no good result has been found.