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OSD::main ()

| | _ ObjectStore::create () |

| | _ _ call the FileStore constructor to create a FileStore class object |

| | _ _ MonClient::build_initial_monmap () reads monitor map information from the configuration file |

| | _ OSD::mkfs () |

| | _ FileStore::mkfs () |

| | _ _ generate fsid file under / var/lib/ceph/osd/ceph-$ {id} / directory |

| | _ _ create a version_stamp file under / var/lib/ceph/osd/ceph-$ {id} / directory |

| | _ _ create a superblock file under / var/lib/ceph/osd/ceph-$ {id} / directory |

| | _ _ create a current folder under / var/lib/ceph/osd/ceph-$ {id} / directory |

| | _ _ create a commit_op_seq file in the / var/lib/ceph/osd/ceph-$ {id} / current/ directory and initialize the content of the file as 1 |

| | _ _ create an osd_uuid file under / var/lib/ceph/osd/ceph-$ {id} / current/omap/ directory (current/omap directory is the working directory of OSD omap) |

| | _ FileStore::mkjournal () |

| | _ FileStore::new_journal () |

| | _ _ FileJournal () constructor to create a FileJournal instance |

| | _ _ create a type file under / var/lib/ceph/osd/ceph-$ {id} / directory and write filestore to the file |

| | _ FileStore::mount () |

| | _ FileStore::read_fsid () |

| | _ _ FileStore::version_stamp_is_valid () checks whether the version_stmap file is valid and reads the contents of the file |

| | _ _ FileStore::read_superblock () reads the contents of the superblock file |

| | _ _ create a nosnap file under / var/lib/ceph/osd/ceph-$ {id} / current/ directory |

| | _ _ take the / var/lib/ceph/osd/ceph-$ {id} / current/omap directory as the base directory of omap_store, and call KeyValueDB::create () to create a KeyValueDB instance |

| | _ _ FileStore::new_journal () creates a journal |

| | _ _ JournalingObjectStore::journal_start () starts journal |

| | _ _ start ondisk_finishers and apply_ finishers thread pool |

| | _ _ FileStore::read () reads superblock object information from "meta" and saves it to OSDSuperblock class object |

| | _ _ compare whether the cluster_fsid in superblock is valid |

| | _ _ OSD::write_meta () writes magic/whoami/ceph_fsid/ready information to the corresponding file under / var/lib/ceph/osd/ceph-$ {id} / directory |

| | _ _ for creating a key, use EntityAuth.CryptoKey to create a key and add the newly created key to the keyring, and also write the keyring to the keyring file under / var/lib/ceph/osd/ceph-$ {id} / directory |

| | _ _ for creating a journal, call the FileStore::mkjournal () function to create a journal |

| | _ _ OSD::peek_meta () reads magic/cluster_fsid/osd_fsid/whoami information from the corresponding file under / var/lib/ceph/osd/ceph-$ {id} / directory |

| | _ _ pick_addresses () reads public_addr and cluster_ addr values from the configuration file |

| _ _ create an instance of Messenger class of client/cluster/hbclient/hb_back_server/hb_front_server. Generally speaking, client and hb_front_server use public_addr,cluster/hbclient/hb_back_server and cluster_addr.

| | _ _ MonClient::build_initial_monmap () creates a MonMap from the configuration file |

| | _ _ call the OSD class constructor to create an OSD class object |

| | _ OSD::pre_init () |

| | _ _ start the Messenger class instance of client/cluster/hbclient/hb_back_server/hb_front_server |

| | _ OSD::init () |

| | _ _ tick_timer.init () initializes heartbeat timer |

| | _ _ OSDService.backill_request_timer.init () initializes the backfill request timer |

| | _ _ ObjectStore::mount () mounts the file system |

| | _ _ OSD::read_superblock () reads the superblock information from the cluster and saves it to the OSDSuperblock class object |

| | _ _ make sure that the snapmapper object exists in "meta" |

| | _ _ create ClassHandler class instance |

| | _ _ get_map () gets the osdmap based on the current epoch value recorded in the superblock. If the osdmap is not in the map_cache, the osdmap is read from the osdmap.epoch of "meta" and synchronized to the map_cache. |

| | _ _ OSD::load_pgs () reads all pg information on OSD |

| | _ _ FileStore::list_collections () traverses all directories under the / var/lib/ceph/osd/ceph-$ {id} / current/ directory and only TYPE_PG |

| | _ _ coll_t.parse () parses all directories under the / var/lib/ceph/osd/ceph-$ {id} / current/ directory, and meta corresponds to TYPE_META,_head and TYPE_PG,_TEMP corresponds to TYPE_TEMP |

| | _ _ traverses all TYPE_PG |

| | _ _ call PG::peek_map_epoch () function |

| | _ OSD::_open_lock_pg () |

| | _ _ OSD::_make_pg () creates an instance of ReplicatedPG class |

| | _ _ PG::read_state () reads the status of PG |

| | _ _ PG::read_info () reads the value of the _ infover/_info/_biginfo attribute from omap |

| | _ _ PGLog::read_log () reads PGLog information and obtains missing information based on PGLog information |

| | _ _ OSDMap::pg_to_up_acting_osds () calculates the OSDs corresponding to the PG |

| | _ _ PG::init_primary_up_acting () the OSDs corresponding to the PG |

| | _ _ OSDMap::calc_pg_role () calculates the roles of PG |

| | _ PG::set_role () |

| | _ _ PG::reg_next_scrub () registers the next scrub operation |

| | _ OSD::build_past_intervals_parallel () |

| | _ _ OSD::create_logger () creates an OSD logger |

| | _ _ MonClient::init () initializes MonClient class instance |

| | _ _ start osd_tp/osd_op_tp/recovery_tp/disk_tp/command_ TP thread pool |

| | _ _ OSDService::init () initializes OSDService |

| | _ _ MonClient::authenticate () does Monitor authentication |

| | _ _ OSD::update_crush_location () OSD updates crushmap operation after startup. You can set osd_crush_update_on_start = false in the configuration file to prohibit updating crushmap after OSD starts. |

| | _ OSDService::final_init () |

| | _ OSD::consume_map () |

| | _ OSD::start_boot () |

| | _ OSD::finial_init () |

| | _ _ registers a series of commands that operate through socket |

The above is all the contents of the article "sample Analysis of Jewel OSD process startup process in ceph". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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