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### Manual Installation
[Official documentation][https://docs.ceph.com/en/latest/install/manual-deployment/]
## Repos and software
For example the nautilus repos are:
```
https://download.ceph.com/rpm-nautilus/el7/x86_64/
https://download.ceph.com/rpm-nautilus/el7/noarch/
```
A nautilis installation consist for example of the following packages:
```
ceph-selinux-14.2.11-0.el7.x86_64
libcephfs2-14.2.11-0.el7.x86_64
ceph-osd-14.2.11-0.el7.x86_64
ceph-common-14.2.11-0.el7.x86_64
ceph-mds-14.2.11-0.el7.x86_64
python-cephfs-14.2.11-0.el7.x86_64
ceph-mgr-14.2.11-0.el7.x86_64
ceph-14.2.11-0.el7.x86_64
python-ceph-argparse-14.2.11-0.el7.x86_64
ceph-mon-14.2.11-0.el7.x86_64
ceph-base-14.2.11-0.el7.x86_64
```
This guide consider an installation where user `ceph` is used and it has `sudo` privileges.
## Cluster identifier
```
/usr/bin/uuidgen
4f0be998-bcbe-4267-a866-a8f0fe74c444
```
* Firts node
Login into the first node and ensure you have the folder
```
/etc/ceph
```
create a `ceph.conf` file
```
[global]
fsid = <cluster id>
mon_initial_members = <hostname1, hostname2 ...>
mon_host = <ip1 , ip2 ...>
cluster_network = <network CIDR notation>
public_network = <network CIDR notation>
auth_cluster_required = cephx
auth_service_required = cephx
auth_client_required = cephx
auth_supported = cephx
```
## Keys creation
For a reference on the user management:
[User Management][https://docs.ceph.com/en/latest/rados/operations/user-management/]
Monitor key creation
```
sudo ceph-authtool --create-keyring /tmp/ceph.mon.keyring --gen-key -n mon. --cap mon 'allow *'
```
Create admin key
```
sudo ceph-authtool --create-keyring /etc/ceph/ceph.client.admin.keyring --gen-key -n client.admin --cap mon 'allow *' --cap osd 'allow *' --cap mds 'allow *' --cap mgr 'allow *'
```
(Note that the name client.admin stands for 'client acting with admin privileges')
Generate a bootstrap-osd keyring and a client.bootstrap-osd user and add the user to the keyring
```
sudo ceph-authtool --create-keyring /var/lib/ceph/bootstrap-osd/ceph.keyring --gen-key -n client.bootstrap-osd --cap mon 'profile bootstrap-osd' --cap mgr 'allow r'
```
(basically the bootstrap roles are used to bootstrap services and add the keys)
Add the keys to the mon keyring
```
sudo ceph-authtool /tmp/ceph.mon.keyring --import-keyring /etc/ceph/ceph.client.admin.keyring
sudo ceph-authtool /tmp/ceph.mon.keyring --import-keyring /var/lib/ceph/bootstrap-osd/ceph.keyring
```
Change the ownership
```
sudo chown ceph:ceph /tmp/ceph.mon.keyring
```
Create the monitor map
```
monmaptool --create --add {hostname} {ip-address} --fsid {uuid} /tmp/monmap
```
Create the directory for the monitor
```
sudo mkdir /var/lib/ceph/mon/{cluster-name}-{hostname}
```
Populate the monitor daemon(s) with the monitor map and keyring
```
sudo -u ceph ceph-mon [--cluster {cluster-name}] --mkfs -i {hostname} --monmap /tmp/monmap --keyring /tmp/ceph.mon.keyring
```
Start the monitor
```
sudo systemctl start ceph-mon@node1
```
## Create the OSDs
# Bluestore
Prepare and activate
```
sudo ceph-volume lvm create --data {data-path}
sudo ceph-volume lvm activate {ID} {FSID}
```
# Alternative (manual disk preparation)
Considering using two disks (/dev/sdb,/dev/sdc). The first one to be used for data the second one for `wal` and `db`.
Create a physical volume on the first one:
```
pvcreate /dev/sdb
```
Create the volume group
```
vgcreate disk1_data /dev/sdb
Volume group "disk1_data" successfully created
vgdisplay
--- Volume group ---
VG Name disk1_data
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 1
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size <1,82 TiB
PE Size 4,00 MiB
Total PE 476598
Alloc PE / Size 0 / 0
Free PE / Size 476598 / <1,82 TiB
VG UUID JfdKeK-35Ck-wsBF-1pvw-Uj6a-FEdf-LzDPtQ
```
Finally create the logical volume
```
lvcreate -l100%FREE -n sdb_data disk1_data
Logical volume "sdb_data" created.
[root@ds-303 manifests]# lvdisplay
--- Logical volume ---
LV Path /dev/disk1_data/sdb_data
LV Name sdb_data
VG Name disk1_data
LV UUID gFZQDt-gZ3F-w2If-Us54-ijSA-qzWT-7Uc4jE
LV Write Access read/write
LV Creation host, time ds-303.cr.cnaf.infn.it, 2020-09-30 12:22:19 +0200
LV Status available
# open 0
LV Size <1,82 TiB
Current LE 476598
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
```
Now prepare the `wal` and `db` partitions on the second disk.
```
pvcreate /dev/sdc
vgcreate disk2_journal /dev/sdc
lvcreate -L1G -n sdb_wal disk2_journal
lvcreate -L10G -n sdb_db disk2_journal
```