update

technology/linux/filesystems/Ceph.md

@@ -58,4 +58,50 @@ ceph status
 ## Host Management
 #todo -> https://docs.ceph.com/en/latest/cephadm/host-management/
 
+Add a new host:
+```shell
+# Add new node with admin label
+ceph orch host add <hostname> <host_ip> --label _admin
+```
 
+## OSD Managemenent
+#todo -> https://docs.ceph.com/en/reef/mgr/diskprediction
+#todo -> https://docs.ceph.com/en/reef/rados/operations/add-or-rm-osds/
+
+## User Management
+#todo -> https://docs.ceph.com/en/reef/rados/operations/user-management/
+
+## Pools
+#todo -> https://docs.ceph.com/en/reef/rados/operations/pools/
+
+### Replicated
+
+### Erasure Coding
+#todo -> https://docs.ceph.com/en/reef/rados/operations/erasure-code/
+
+### CRUSH Maps
+#todo -> https://docs.ceph.com/en/reef/rados/operations/crush-map/
+
+## CephFS
+#todo -> https://docs.ceph.com/en/reef/cephfs/#
+
+### Mount
+
+`mount -t ceph <MON_IP>:/ /mnt -o name=admin,secret=<SECRET>`
+
+Secret can be found in the keyring at `/etc/ceph`
+
+### Snapshots
+Ceph can take directory scoped snapshots of the filesystem.
+
+Snapshots of the directory will be stored in `.snap`.
+
+**Create a new snapshot**: `mkdir .snap/snap_name`
+
+**Remove a snapshot**: `rmdir .snap/snap_name`
+
+## Block Device (RBD)
+#todo -> https://docs.ceph.com/en/reef/rbd/
+
+## Object Gateway (S3)
+#todo -> https://docs.ceph.com/en/reef/radosgw/