Ceph/MicroCeph

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MicroCeph

Ubuntu 22.04 LTS MicroCeph with Snap 

These installation instructions use MicroCeph - Ceph in a snap. MicroCeph is a pure upstream Ceph distribution designed for small scale and edge deployments, which can be installed and maintained with minimal knowledge and effort.
  • Uses MicroCeph
  • Minimum 4-nodes, full-HA Ceph cluster
  • Suitable for small-scale production environments
Install Ceph on Ubuntu | Ubuntu
https://ubuntu.com/ceph/install

Requirements:

  • You will need 4 physical machines with multi-core processors and at least 8GiB of memory and 100GB of disk space. MicroCeph has been tested on x86-based physical machines running Ubuntu 22.04 LTS.

Note: If snap is not installed: 

sudo apt install snapd

Install microceph: 

sudo snap install microceph

Bootstrap cluster from first node: 

sudo microceph cluster bootstrap

From first node add other nodes: 

sudo microceph cluster add node[x]

Copy join output onto node[x]: 

sudo microceph cluster join [pasted-output-from-node1]

Check status: 

sudo microceph.ceph status

Add some disks to each node (as OSDs): 

sudo microceph disk add /dev/sd[x] --wipe

Config files are found at: 

/var/snap/microceph/current/conf/
  /var/snap/microceph/current/conf/ceph.conf
  /var/snap/microceph/current/conf/metadata.yaml
  /var/snap/microceph/current/conf/ceph.keyring

Create links: 

mkdir -p /etc/ceph  # not needed if you 'apt install ceph-common'
ln -s /var/snap/microceph/current/conf/ceph.conf /etc/ceph/ceph.conf
ln -s /var/snap/microceph/current/conf/ceph.keyring /etc/ceph/ceph.keyring

Verify cluster: 

sudo microceph.ceph status
sudo microceph.ceph osd status

microceph disk list

Get Auth

ceph auth get client.admin

Example: 

[client.admin]
        key = AQBKdXXXXXXXXXXXXXXXXXXXXX==
        caps mds = "allow *"
        caps mgr = "allow *"
        caps mon = "allow *"
        caps osd = "allow *"

Used for things like /etc/ceph/ceph.keyring

Create File System

Create data and metadata pool: 

ceph osd pool create cephfs_data
ceph osd pool create cephfs_metadata

# with different PGs, which can range from 0 to 512, and probably has auto scaling on...
ceph osd pool create cephfs_data 64
ceph osd pool create cephfs_metadata 32

View pool stats: 

ceph osd pool ls
ceph osd lspools
ceph osd pool stats

Create filesystem: 

# ceph fs new  <fs_name> <metadata_pool>  <data_pool>
ceph   fs new  cephfs    cephfs_metadata  cephfs_data

View filesystems: 

ceph fs ls
ceph fs status
ceph fs status [cephfs]

Stat the MDs: 

ceph mds stat

Reference: 

Create a Ceph file system — Ceph Documentation
https://docs.ceph.com/en/quincy/cephfs/createfs/

Local Mount

(make sure a cephfs has been created first)

If you are on one of the cluster nodes, and if you look at the ceph.keyring, you will notice the default user was likely 'admin' (client.admin).

Install mount.ceph wrapper: 

apt install ceph-common

Assuming /etc/ceph/ceph.keyring exits: 

mount -t ceph :/ /mnt -o name=admin

New style, with the mount.ceph helper, assuming the fs was created as 'mycfs': 

mount.ceph admin@.mycfs=/ /mnt

# Or:
mount -t ceph admin@.cfs=/ /mnt

/etc/fstab: 

admin@.mycfs=/    /mycfs    ceph    defaults,noauto    0 0

Specify it all: 

mount -t ceph {device-string}={path-to-mounted} {mount-point} -o {key-value-args} {other-args}

mount -t ceph <name>@<fsid>.<fs_name>=/ /mnt

mount -t ceph cephuser@.cephfs=/ /mnt -o secretfile=/etc/ceph/cephuser.secret

mount -t ceph cephuser@.cephfs=/ /mnt -o secret=AQATSKdNGBnwLhAAnNDKnH65FmVKpXZJVasUeQ==

Reference: 

Mount CephFS using Kernel Driver — Ceph Documentation
https://docs.ceph.com/en/latest/cephfs/mount-using-kernel-driver/

NFS share with Ganesha

(make sure a cephfs has been created first)

Install ganesha: 

apt install nfs-ganesha nfs-ganesha-ceph

Config (below)

Restart service: 

systemctl restart nfs-ganesha

Config: 

/etc/ganesha/ganesha.conf

NFS_CORE_PARAM
{
        Enable_NLM = false;
        Enable_RQUOTA = false;
        #Protocols = 4;
}
NFSv4
{
        RecoveryBackend = rados_ng;
        Minor_Versions =  1,2;
}
MDCACHE {
        Dir_Chunk = 0;
}
EXPORT
{
        Export_ID=100;
        Protocols = 3, 4;
        SecType = "sys";
        Transports = TCP;
        Path = /;
        Pseudo = /;
        Access_Type = RW;
        Attr_Expiration_Time = 0;
        Squash = No_root_squash;

        FSAL {
                Name = CEPH;
                Filesystem = "mycfs";
        }
}

Longer config version: 

NFS_CORE_PARAM
{
        # Ganesha can lift the NFS grace period early if NLM is disabled.
        Enable_NLM = false;

        # rquotad doesn't add any value here. CephFS doesn't support per-uid
        # quotas anyway.
        Enable_RQUOTA = false;

        # In this configuration, we're just exporting NFSv4. In practice, it's
        # best to use NFSv4.1+ to get the benefit of sessions.
        #Protocols = 4;

}

NFSv4
{
        # Modern versions of libcephfs have delegation support, though they
        # are not currently recommended in clustered configurations. They are
        # disabled by default but can be re-enabled for singleton or
        # active/passive configurations.
        # Delegations = false;

        # One can use any recovery backend with this configuration, but being
        # able to store it in RADOS is a nice feature that makes it easy to
        # migrate the daemon to another host.
        #
        # For a single-node or active/passive configuration, rados_ng driver
        # is preferred. For active/active clustered configurations, the
        # rados_cluster backend can be used instead. See the
        # ganesha-rados-grace manpage for more information.
        RecoveryBackend = rados_ng;

        # NFSv4.0 clients do not send a RECLAIM_COMPLETE, so we end up having
        # to wait out the entire grace period if there are any. Avoid them.
        Minor_Versions =  1,2;
}

# The libcephfs client will aggressively cache information while it
# can, so there is little benefit to ganesha actively caching the same
# objects. Doing so can also hurt cache coherency. Here, we disable
# as much attribute and directory caching as we can.
MDCACHE {
        # Size the dirent cache down as small as possible.
        Dir_Chunk = 0;
}

EXPORT
{
        # Unique export ID number for this export
        Export_ID=100;

        # We're only interested in NFSv4 in this configuration
        Protocols = 3, 4;

        SecType = "sys";

        # NFSv4 does not allow UDP transport
        Transports = TCP;

        #
        # Path into the cephfs tree.
        #
        # Note that FSAL_CEPH does not support subtree checking, so there is
        # no way to validate that a filehandle presented by a client is
        # reachable via an exported subtree.
        #
        # For that reason, we just export "/" here.
        Path = /;

        #
        # The pseudoroot path. This is where the export will appear in the
        # NFS pseudoroot namespace.
        #
        Pseudo = /;

        # We want to be able to read and write
        Access_Type = RW;

        # Time out attribute cache entries immediately
        Attr_Expiration_Time = 0;

        # NFS servers usually decide to "squash" incoming requests from the
        # root user to a "nobody" user. It's possible to disable that, but for
        # now, we leave it enabled.
        # Squash = root;
        Squash = No_root_squash;

        FSAL {
                # FSAL_CEPH export
                Name = CEPH;

                #
                # Ceph filesystems have a name string associated with them, and
                # modern versions of libcephfs can mount them based on the
                # name. The default is to mount the default filesystem in the
                # cluster (usually the first one created).
                #
                # Filesystem = "cephfs_a";
                Filesystem = "mycfs";

        }
}

Config references:

Documentation

Charmed Ceph Documentation | Ubuntu
https://ubuntu.com/ceph/docs

Remove MicroCeph

If you decide you want to remove everything cleanly: 

sudo snap remove microceph

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