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视频链接：初始化ceph最小集群

使用cephadm bootstrap初始化最小集群> cephadm bootstrap 过程是在单一节点上创建一个小型的ceph集群，包括一个ceph monitor和一个ceph mgr，以及监控组件，包括prometheus、node-exporter等。```shell## 初始化时，指定了mon-ip、集群网段、dashboard初始用户名和密码# cephadm bootstrap --mon-ip 192.168.59.241  --cluster-network 10.168.59.0/24 --initial-dashboard-user admin --initial-dashboard-password demo2023Creating directory /etc/ceph for ceph.confVerifying podman|docker is present...Verifying lvm2 is present...Verifying time synchronization is in place...Unit chronyd.service is enabled and runningRepeating the final host check...docker (/usr/bin/docker) is presentsystemctl is presentlvcreate is presentUnit chronyd.service is enabled and runningHost looks OKCluster fsid: 2e1228b0-0781-11ee-aa8a-000c2921faf1Verifying IP 192.168.59.241 port 3300 ...Verifying IP 192.168.59.241 port 6789 ...Mon IP `192.168.59.241` is in CIDR network `192.168.59.0/24`Mon IP `192.168.59.241` is in CIDR network `192.168.59.0/24`Pulling container image quay.io/ceph/ceph:v17...Ceph version: ceph version 17.2.6 (d7ff0d10654d2280e08f1ab989c7cdf3064446a5) quincy (stable)Extracting ceph user uid/gid from container image...Creating initial keys...Creating initial monmap...Creating mon...Waiting for mon to start...Waiting for mon...mon is availableAssimilating anything we can from ceph.conf...Generating new minimal ceph.conf...Restarting the monitor...Setting mon public_network to 192.168.59.0/24Setting cluster_network to 10.168.59.0/24Wrote config to /etc/ceph/ceph.confWrote keyring to /etc/ceph/ceph.client.admin.keyringCreating mgr...Verifying port 9283 ...Waiting for mgr to start...Waiting for mgr...mgr not available, waiting (1/15)...mgr not available, waiting (2/15)...mgr not available, waiting (3/15)...mgr not available, waiting (4/15)...mgr is availableEnabling cephadm module...Waiting for the mgr to restart...Waiting for mgr epoch 5...mgr epoch 5 is availableSetting orchestrator backend to cephadm...Generating ssh key...Wrote public SSH key to /etc/ceph/ceph.pubAdding key to root@localhost authorized_keys...Adding host ceph01...Deploying mon service with default placement...Deploying mgr service with default placement...Deploying crash service with default placement...Deploying prometheus service with default placement...Deploying grafana service with default placement...Deploying node-exporter service with default placement...Deploying alertmanager service with default placement...Enabling the dashboard module...Waiting for the mgr to restart...Waiting for mgr epoch 9...mgr epoch 9 is availableGenerating a dashboard self-signed certificate...Creating initial admin user...Fetching dashboard port number...Ceph Dashboard is now available at:             URL: https://ceph01:8443/            User: admin        Password: p5tuqo17weEnabling client.admin keyring and conf on hosts with "admin" labelSaving cluster configuration to /var/lib/ceph/2e1228b0-0781-11ee-aa8a-000c2921faf1/config directoryEnabling autotune for osd_memory_targetYou can access the Ceph CLI as following in case of multi-cluster or non-default config:        sudo /usr/sbin/cephadm shell --fsid 2e1228b0-0781-11ee-aa8a-000c2921faf1 -c /etc/ceph/ceph.conf -k /etc/ceph/ceph.client.admin.keyringOr, if you are only running a single cluster on this host:        sudo /usr/sbin/cephadm shell Please consider enabling telemetry to help improve Ceph:        ceph telemetry onFor more information see:        https://docs.ceph.com/docs/master/mgr/telemetry/## 也可以在初始化时指定dashboard用户名和密码  --initial-dashboard-user  admin --initial-dashboard-password demo2023# ls /etc/ceph/ceph.client.admin.keyring  ceph.conf  ceph.pub  rbdmap```- ceph.client.admin.keyring  是具有ceph管理员的秘钥- ceph.conf  是最小化配置文件- ceph.pub  是一个公钥，拷贝到其他节点后，可以免密登录。> 在5个以上ceph节点时，默认会将其中5个节点当做mon，这可以从`ceph orch ls`中看出来```shell# ceph orch lsNAME           PORTS        RUNNING  REFRESHED  AGE  PLACEMENT  alertmanager   ?:9093,9094      1/1  7m ago     46m  count:1    crash                           1/1  7m ago     46m  *          grafana        ?:3000           1/1  7m ago     46m  count:1    mgr                             1/2  7m ago     46m  count:2    mon                             1/5  7m ago     46m  count:5    node-exporter  ?:9100           1/1  7m ago     46m  *          prometheus     ?:9095           1/1  7m ago     46m  count:1   ```> 初始化mon后，此时集群还处于WARN状态，没有OSD，MON的数量也才只有1个，MGR也只有1个，所以接下来就是先添加ceph节点。```shell# ceph -s  cluster:    id:     67ccccf2-07f6-11ee-a1c2-000c2921faf1    health: HEALTH_WARN            OSD count 0 < osd_pool_default_size 3  services:    mon: 1 daemons, quorum ceph01 (age 9m)    mgr: ceph01.sdqukl(active, since 7m)    osd: 0 osds: 0 up, 0 in  data:    pools:   0 pools, 0 pgs    objects: 0 objects, 0 B    usage:   0 B used, 0 B / 0 B avail    pgs:     ```

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