之前已詳細介紹了Ceph分散式儲存基礎知識，下面簡單記錄下Centos7使用Ceph-deploy快速部署Ceph環境：
1）基本環境
192.168.10.220 ceph-admin（ceph-deploy） mds1、mon1（也可以將monit節點另放一臺機器） 192.168.10.239 ceph-node1 osd1 192.168.10.212 ceph-node2 osd2 192.168.10.213 ceph-node3 osd3 ------------------------------------------------- 每個節點修改主機名 # hostnamectl set-hostname ceph-admin # hostnamectl set-hostname ceph-node1 # hostnamectl set-hostname ceph-node2 # hostnamectl set-hostname ceph-node3 ------------------------------------------------- 每個節點繫結主機名對映 # cat /etc/hosts 192.168.10.220 ceph-admin 192.168.10.239 ceph-node1 192.168.10.212 ceph-node2 192.168.10.213 ceph-node3 ------------------------------------------------- 每個節點確認連通性 # ping -c 3 ceph-admin # ping -c 3 ceph-node1 # ping -c 3 ceph-node2 # ping -c 3 ceph-node3 ------------------------------------------------- 每個節點關閉防火牆和selinux # systemctl stop firewalld # systemctl disable firewalld # sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config # setenforce 0 ------------------------------------------------- 每個節點安裝和配置NTP（官方推薦的是叢集的所有節點全部安裝並配置 NTP，需要保證各節點的系統時間一致。沒有自己部署ntp伺服器，就線上同步NTP） # yum install ntp ntpdate ntp-doc -y # systemctl restart ntpd # systemctl status ntpd ------------------------------------------------- 每個節點準備yum源 刪除預設的源，國外的比較慢 # yum clean all # mkdir /mnt/bak # mv /etc/yum.repos.d/* /mnt/bak/ 下載阿里雲的base源和epel源 # wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo # wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo 新增ceph源 # vim /etc/yum.repos.d/ceph.repo [ceph] name=ceph baseurl=http://mirrors.aliyun.com/ceph/rpm-jewel/el7/x86_64/ gpgcheck=0 priority =1 [ceph-noarch] name=cephnoarch baseurl=http://mirrors.aliyun.com/ceph/rpm-jewel/el7/noarch/ gpgcheck=0 priority =1 [ceph-source] name=Ceph source packages baseurl=http://mirrors.aliyun.com/ceph/rpm-jewel/el7/SRPMS gpgcheck=0 priority=1 ------------------------------------------------------------ 每個節點建立cephuser使用者，設定sudo許可權 # useradd -d /home/cephuser -m cephuser # echo "cephuser"|passwd --stdin cephuser # echo "cephuser ALL = (root) NOPASSWD:ALL" | sudo tee /etc/sudoers.d/cephuser # chmod 0440 /etc/sudoers.d/cephuser # sed -i s'/Defaults requiretty/#Defaults requiretty'/g /etc/sudoers 測試cephuser的sudo許可權 # su - cephuser $ sudo su - # ------------------------------------------------------------ 配置相互間的ssh信任關係 現在ceph-admin節點上產生公私鑰檔案，然後將ceph-admin節點的.ssh目錄拷貝給其他節點 [root@ceph-admin ~]# su - cephuser [cephuser@ceph-admin ~]$ ssh-keygen -t rsa #一路回車 [cephuser@ceph-admin ~]$ cd .ssh/ [cephuser@ceph-admin .ssh]$ ls id_rsa id_rsa.pub [cephuser@ceph-admin .ssh]$ cp id_rsa.pub authorized_keys [cephuser@ceph-admin .ssh]$ scp -r /home/cephuser/.ssh ceph-node1:/home/cephuser/ [cephuser@ceph-admin .ssh]$ scp -r /home/cephuser/.ssh ceph-node2:/home/cephuser/ [cephuser@ceph-admin .ssh]$ scp -r /home/cephuser/.ssh ceph-node3:/home/cephuser/ 然後在各節點直接驗證cephuser使用者下的ssh相互信任關係 $ ssh -p22 cephuser@ceph-admin $ ssh -p22 cephuser@ceph-node1 $ ssh -p22 cephuser@ceph-node2 $ ssh -p22 cephuser@ceph-node3
2）準備磁碟（ceph-node1、ceph-node2、ceph-node3三個節點）
測試時使用的磁碟不要太小，否則後面新增磁碟時會報錯，建議磁碟大小為20G及以上。 三個節點均是在WebvirtMgr上建立的虛擬機器，參考：https://www.cnblogs.com/kevingrace/p/8387999.html 文件中建立並掛載虛擬機器磁碟。 如下分別在三個節點掛載了一塊20G的裸盤 檢查磁碟 $ sudo fdisk -l /dev/vdb Disk /dev/vdb: 21.5 GB, 21474836480 bytes, 41943040 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes 格式化磁碟 $ sudo parted -s /dev/vdb mklabel gpt mkpart primary xfs 0% 100% $ sudo mkfs.xfs /dev/vdb -f 檢視磁碟格式（xfs格式） $ sudo blkid -o value -s TYPE /dev/vdb
3）部署階段（ceph-admin節點上使用ceph-deploy快速部署）
[root@ceph-admin ~]# su - cephuser
安裝ceph-deploy
[cephuser@ceph-admin ~]$ sudo yum update -y && sudo yum install ceph-deploy -y
建立cluster目錄
[cephuser@ceph-admin ~]$ mkdir cluster
[cephuser@ceph-admin ~]$ cd cluster/
建立叢集（後面填寫monit節點的主機名，這裡monit節點和管理節點是同一臺機器，即ceph-admin）
[cephuser@ceph-admin cluster]$ ceph-deploy new ceph-admin
.........
[ceph-admin][DEBUG ] IP addresses found: [u'192.168.10.220']
[ceph_deploy.new][DEBUG ] Resolving host ceph-admin
[ceph_deploy.new][DEBUG ] Monitor ceph-admin at 192.168.10.220
[ceph_deploy.new][DEBUG ] Monitor initial members are ['ceph-admin']
[ceph_deploy.new][DEBUG ] Monitor addrs are ['192.168.10.220']
[ceph_deploy.new][DEBUG ] Creating a random mon key...
[ceph_deploy.new][DEBUG ] Writing monitor keyring to ceph.mon.keyring...
[ceph_deploy.new][DEBUG ] Writing initial config to ceph.conf...
修改ceph.conf檔案（注意：mon_host必須和public network 網路是同網段內！）
[cephuser@ceph-admin cluster]$ vim ceph.conf #新增下面兩行配置內容
......
public network = 192.168.10.220/24
osd pool default size = 3
安裝ceph（過程有點長，需要等待一段時間....）
[cephuser@ceph-admin cluster]$ ceph-deploy install ceph-admin ceph-node1 ceph-node2 ceph-node3
初始化monit監控節點，並收集所有金鑰
[cephuser@ceph-admin cluster]$ ceph-deploy mon create-initial
[cephuser@ceph-admin cluster]$ ceph-deploy gatherkeys ceph-admin
新增OSD到叢集
檢查OSD節點上所有可用的磁碟
[cephuser@ceph-admin cluster]$ ceph-deploy disk list ceph-node1 ceph-node2 ceph-node3
使用zap選項刪除所有osd節點上的分割槽
[cephuser@ceph-admin cluster]$ ceph-deploy disk zap ceph-node1:/dev/vdb ceph-node2:/dev/vdb ceph-node3:/dev/vdb
準備OSD（使用prepare命令）
[cephuser@ceph-admin cluster]$ ceph-deploy osd prepare ceph-node1:/dev/vdb ceph-node2:/dev/vdb ceph-node3:/dev/vdb
啟用OSD（注意由於ceph對磁碟進行了分割槽，/dev/vdb磁碟分割槽為/dev/vdb1）
[cephuser@ceph-admin cluster]$ ceph-deploy osd activate ceph-node1:/dev/vdb1 ceph-node2:/dev/vdb1 ceph-node3:/dev/vdb1
---------------------------------------------------------------------------------------------
可能出現下面的報錯：
[ceph-node1][WARNIN] ceph_disk.main.Error: Error: /dev/vdb1 is not a directory or block device
[ceph-node1][ERROR ] RuntimeError: command returned non-zero exit status: 1
[ceph_deploy][ERROR ] RuntimeError: Failed to execute command: /usr/sbin/ceph-disk -v activate --mark-init systemd --mount /dev/vdb1
但是這個報錯沒有影響ceph的部署，在三個osd節點上通過命令已顯示磁碟已成功mount：
[cephuser@ceph-node1 ~]$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sr0 11:0 1 4.2G 0 rom
vda 252:0 0 70G 0 disk
├─vda1 252:1 0 1G 0 part /boot
└─vda2 252:2 0 69G 0 part
├─centos-root 253:0 0 43.8G 0 lvm /
├─centos-swap 253:1 0 3.9G 0 lvm [SWAP]
└─centos-home 253:2 0 21.4G 0 lvm /home
vdb 252:16 0 20G 0 disk
├─vdb1 252:17 0 15G 0 part /var/lib/ceph/osd/ceph-0 #掛載成功
└─vdb2 252:18 0 5G 0 part
[cephuser@ceph-node2 ~]$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sr0 11:0 1 4.2G 0 rom
vda 252:0 0 70G 0 disk
├─vda1 252:1 0 1G 0 part /boot
└─vda2 252:2 0 69G 0 part
├─centos-root 253:0 0 43.8G 0 lvm /
├─centos-swap 253:1 0 3.9G 0 lvm [SWAP]
└─centos-home 253:2 0 21.4G 0 lvm /home
vdb 252:16 0 20G 0 disk
├─vdb1 252:17 0 15G 0 part /var/lib/ceph/osd/ceph-1 #掛載成功
└─vdb2 252:18 0 5G 0 part
[cephuser@ceph-node3 ~]$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sr0 11:0 1 4.2G 0 rom
vda 252:0 0 70G 0 disk
├─vda1 252:1 0 1G 0 part /boot
└─vda2 252:2 0 69G 0 part
├─centos-root 253:0 0 43.8G 0 lvm /
├─centos-swap 253:1 0 3.9G 0 lvm [SWAP]
└─centos-home 253:2 0 21.4G 0 lvm /home
vdb 252:16 0 20G 0 disk
├─vdb1 252:17 0 15G 0 part /var/lib/ceph/osd/ceph-2 #掛載成功
└─vdb2 252:18 0 5G 0 part
檢視OSD
[cephuser@ceph-admin cluster]$ ceph-deploy disk list ceph-node1 ceph-node2 ceph-node3
........
[ceph-node1][DEBUG ] /dev/vdb2 ceph journal, for /dev/vdb1 #如下顯示這兩個分割槽，則表示成功了
[ceph-node1][DEBUG ] /dev/vdb1 ceph data, active, cluster ceph, osd.0, journal /dev/vdb2
........
[ceph-node3][DEBUG ] /dev/vdb2 ceph journal, for /dev/vdb1
[ceph-node3][DEBUG ] /dev/vdb1 ceph data, active, cluster ceph, osd.1, journal /dev/vdb2
.......
[ceph-node3][DEBUG ] /dev/vdb2 ceph journal, for /dev/vdb1
[ceph-node3][DEBUG ] /dev/vdb1 ceph data, active, cluster ceph, osd.2, journal /dev/vdb2
用ceph-deploy把配置檔案和admin金鑰拷貝到管理節點和Ceph節點，這樣你每次執行Ceph命令列時就無需指定monit節點地址
和ceph.client.admin.keyring了
[cephuser@ceph-admin cluster]$ ceph-deploy admin ceph-admin ceph-node1 ceph-node2 ceph-node3
修改金鑰許可權
[cephuser@ceph-admin cluster]$ sudo chmod 644 /etc/ceph/ceph.client.admin.keyring
檢查ceph狀態
[cephuser@ceph-admin cluster]$ sudo ceph health
HEALTH_OK
[cephuser@ceph-admin cluster]$ sudo ceph -s
cluster 33bfa421-8a3b-40fa-9f14-791efca9eb96
health HEALTH_OK
monmap e1: 1 mons at {ceph-admin=192.168.10.220:6789/0}
election epoch 3, quorum 0 ceph-admin
osdmap e14: 3 osds: 3 up, 3 in
flags sortbitwise,require_jewel_osds
pgmap v29: 64 pgs, 1 pools, 0 bytes data, 0 objects
100 MB used, 45946 MB / 46046 MB avail
64 active+clean
檢視ceph osd執行狀態
[cephuser@ceph-admin ~]$ ceph osd stat
osdmap e19: 3 osds: 3 up, 3 in
flags sortbitwise,require_jewel_osds
檢視osd的目錄樹
[cephuser@ceph-admin ~]$ ceph osd tree
ID WEIGHT TYPE NAME UP/DOWN REWEIGHT PRIMARY-AFFINITY
-1 0.04376 root default
-2 0.01459 host ceph-node1
0 0.01459 osd.0 up 1.00000 1.00000
-3 0.01459 host ceph-node2
1 0.01459 osd.1 up 1.00000 1.00000
-4 0.01459 host ceph-node3
2 0.01459 osd.2 up 1.00000 1.00000
檢視monit監控節點的服務情況
[cephuser@ceph-admin cluster]$ sudo systemctl status ceph-mon@ceph-admin
[cephuser@ceph-admin cluster]$ ps -ef|grep ceph|grep 'cluster'
ceph 28190 1 0 11:44 ? 00:00:01 /usr/bin/ceph-mon -f --cluster ceph --id ceph-admin --setuser ceph --setgroup ceph
分別檢視下ceph-node1、ceph-node2、ceph-node3三個節點的osd服務情況，發現已經在啟動中。
[cephuser@ceph-node1 ~]$ sudo systemctl status ceph-osd@0.service #啟動是start、重啟是restart
[cephuser@ceph-node1 ~]$ sudo ps -ef|grep ceph|grep "cluster"
ceph 28749 1 0 11:44 ? 00:00:00 /usr/bin/ceph-osd -f --cluster ceph --id 0 --setuser ceph --setgroup ceph
cephuser 29197 29051 0 11:54 pts/2 00:00:00 grep --color=auto cluster
[cephuser@ceph-node2 ~]$ sudo systemctl status ceph-osd@1.service
[cephuser@ceph-node2 ~]$ sudo ps -ef|grep ceph|grep "cluster"
ceph 28749 1 0 11:44 ? 00:00:00 /usr/bin/ceph-osd -f --cluster ceph --id 0 --setuser ceph --setgroup ceph
cephuser 29197 29051 0 11:54 pts/2 00:00:00 grep --color=auto cluster
[cephuser@ceph-node3 ~]$ sudo systemctl status ceph-osd@2.service
[cephuser@ceph-node3 ~]$ sudo ps -ef|grep ceph|grep "cluster"
ceph 28749 1 0 11:44 ? 00:00:00 /usr/bin/ceph-osd -f --cluster ceph --id 0 --setuser ceph --setgroup ceph
cephuser 29197 29051 0 11:54 pts/2 00:00:00 grep --color=auto cluster
4）建立檔案系統
先檢視管理節點狀態，預設是沒有管理節點的。
[cephuser@ceph-admin ~]$ ceph mds stat
e1:
建立管理節點（ceph-admin作為管理節點）。
需要注意：如果不建立mds管理節點，client客戶端將不能正常掛載到ceph叢集！！
[cephuser@ceph-admin ~]$ pwd
/home/cephuser
[cephuser@ceph-admin ~]$ cd cluster/
[cephuser@ceph-admin cluster]$ ceph-deploy mds create ceph-admin
再次檢視管理節點狀態，發現已經在啟動中
[cephuser@ceph-admin cluster]$ ceph mds stat
e2:, 1 up:standby
[cephuser@ceph-admin cluster]$ sudo systemctl status ceph-mds@ceph-admin
[cephuser@ceph-admin cluster]$ ps -ef|grep cluster|grep ceph-mds
ceph 29093 1 0 12:46 ? 00:00:00 /usr/bin/ceph-mds -f --cluster ceph --id ceph-admin --setuser ceph --setgroup ceph
建立pool，pool是ceph儲存資料時的邏輯分割槽,它起到namespace的作用
[cephuser@ceph-admin cluster]$ ceph osd lspools #先檢視pool
0 rbd,
新建立的ceph叢集只有rdb一個pool。這時需要建立一個新的pool
[cephuser@ceph-admin cluster]$ ceph osd pool create cephfs_data 10 #後面的數字是PG的數量
pool 'cephfs_data' created
[cephuser@ceph-admin cluster]$ ceph osd pool create cephfs_metadata 10 #建立pool的後設資料
pool 'cephfs_metadata' created
[cephuser@ceph-admin cluster]$ ceph fs new myceph cephfs_metadata cephfs_data
new fs with metadata pool 2 and data pool 1
再次檢視pool狀態
[cephuser@ceph-admin cluster]$ ceph osd lspools
0 rbd,1 cephfs_data,2 cephfs_metadata,
檢查mds管理節點狀態
[cephuser@ceph-admin cluster]$ ceph mds stat
e5: 1/1/1 up {0=ceph-admin=up:active}
檢視ceph叢集狀態
[cephuser@ceph-admin cluster]$ sudo ceph -s
cluster 33bfa421-8a3b-40fa-9f14-791efca9eb96
health HEALTH_OK
monmap e1: 1 mons at {ceph-admin=192.168.10.220:6789/0}
election epoch 3, quorum 0 ceph-admin
fsmap e5: 1/1/1 up {0=ceph-admin=up:active} #多了此行狀態
osdmap e19: 3 osds: 3 up, 3 in
flags sortbitwise,require_jewel_osds
pgmap v48: 84 pgs, 3 pools, 2068 bytes data, 20 objects
101 MB used, 45945 MB / 46046 MB avail
84 active+clean
檢視ceph叢集埠
[cephuser@ceph-admin cluster]$ sudo lsof -i:6789
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
ceph-mon 28190 ceph 10u IPv4 70217 0t0 TCP ceph-admin:smc-https (LISTEN)
ceph-mon 28190 ceph 19u IPv4 70537 0t0 TCP ceph-admin:smc-https->ceph-node1:41308 (ESTABLISHED)
ceph-mon 28190 ceph 20u IPv4 70560 0t0 TCP ceph-admin:smc-https->ceph-node2:48516 (ESTABLISHED)
ceph-mon 28190 ceph 21u IPv4 70583 0t0 TCP ceph-admin:smc-https->ceph-node3:44948 (ESTABLISHED)
ceph-mon 28190 ceph 22u IPv4 72643 0t0 TCP ceph-admin:smc-https->ceph-admin:51474 (ESTABLISHED)
ceph-mds 29093 ceph 8u IPv4 72642 0t0 TCP ceph-admin:51474->ceph-admin:smc-https (ESTABLISHED)
5）client端掛載ceph儲存（採用fuse方式）
安裝ceph-fuse（這裡的客戶機是centos6系統）
[root@centos6-02 ~]# rpm -Uvh https://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
[root@centos6-02 ~]# yum install -y ceph-fuse
建立掛載目錄
[root@centos6-02 ~]# mkdir /cephfs
複製配置檔案
將ceph配置檔案ceph.conf從管理節點copy到client節點（192.168.10.220為管理節點）
[root@centos6-02 ~]# rsync -e "ssh -p22" -avpgolr root@192.168.10.220:/etc/ceph/ceph.conf /etc/ceph/
或者
[root@centos6-02 ~]# rsync -e "ssh -p22" -avpgolr root@192.168.10.220:/home/cephuser/cluster/ceph.conf /etc/ceph/ #兩個路徑下的檔案內容一樣
複製金鑰
將ceph的ceph.client.admin.keyring從管理節點copy到client節點
[root@centos6-02 ~]# rsync -e "ssh -p22" -avpgolr root@192.168.10.220:/etc/ceph/ceph.client.admin.keyring /etc/ceph/
或者
[root@centos6-02 ~]# rsync -e "ssh -p22" -avpgolr root@192.168.10.220:/home/cephuser/cluster/ceph.client.admin.keyring /etc/ceph/
檢視ceph授權
[root@centos6-02 ~]# ceph auth list
installed auth entries:
mds.ceph-admin
key: AQAZZxdbH6uAOBAABttpSmPt6BXNtTJwZDpSJg==
caps: [mds] allow
caps: [mon] allow profile mds
caps: [osd] allow rwx
osd.0
key: AQCuWBdbV3TlBBAA4xsAE4QsFQ6vAp+7pIFEHA==
caps: [mon] allow profile osd
caps: [osd] allow *
osd.1
key: AQC6WBdbakBaMxAAsUllVWdttlLzEI5VNd/41w==
caps: [mon] allow profile osd
caps: [osd] allow *
osd.2
key: AQDJWBdbz6zNNhAATwzL2FqPKNY1IvQDmzyOSg==
caps: [mon] allow profile osd
caps: [osd] allow *
client.admin
key: AQCNWBdbf1QxAhAAkryP+OFy6wGnKR8lfYDkUA==
caps: [mds] allow *
caps: [mon] allow *
caps: [osd] allow *
client.bootstrap-mds
key: AQCNWBdbnjLILhAAT1hKtLEzkCrhDuTLjdCJig==
caps: [mon] allow profile bootstrap-mds
client.bootstrap-mgr
key: AQCOWBdbmxEANBAAiTMJeyEuSverXAyOrwodMQ==
caps: [mon] allow profile bootstrap-mgr
client.bootstrap-osd
key: AQCNWBdbiO1bERAARLZaYdY58KLMi4oyKmug4Q==
caps: [mon] allow profile bootstrap-osd
client.bootstrap-rgw
key: AQCNWBdboBLXIBAAVTsD2TPJhVSRY2E9G7eLzQ==
caps: [mon] allow profile bootstrap-rgw
將ceph叢集儲存掛載到客戶機的/cephfs目錄下
[root@centos6-02 ~]# ceph-fuse -m 192.168.10.220:6789 /cephfs
2018-06-06 14:28:54.149796 7f8d5c256760 -1 init, newargv = 0x4273580 newargc=11
ceph-fuse[16107]: starting ceph client
ceph-fuse[16107]: starting fuse
[root@centos6-02 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_centos602-lv_root
50G 3.5G 44G 8% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/vda1 477M 41M 412M 9% /boot
/dev/mapper/vg_centos602-lv_home
45G 52M 43G 1% /home
/dev/vdb1 20G 5.1G 15G 26% /data/osd1
ceph-fuse 45G 100M 45G 1% /cephfs
由上面可知，已經成功掛載了ceph儲存，三個osd節點，每個節點有15G（在節點上通過"lsblk"命令可以檢視ceph data分割槽大小）,一共45G！
取消ceph儲存的掛載
[root@centos6-02 ~]# umount /cephfs
溫馨提示：
當有一半以上的OSD節點掛掉後，遠端客戶端掛載的Ceph儲存就會使用異常了，即暫停使用。比如本案例中有3個OSD節點，當其中一個OSD節點掛掉後（比如當機），
客戶端掛載的Ceph儲存使用正常；但當有2個OSD節點掛掉後，客戶端掛載的Ceph儲存就不能正常使用了（表現為Ceph儲存目錄下的資料讀寫操作一直卡著狀態），
當OSD節點恢復後，Ceph儲存也會恢復正常使用。OSD節點當機重新啟動後，osd程式會自動起來（通過監控節點自動起來）
============================其他記錄===========================
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清除ceph儲存
清除安裝包
[cephuser@ceph-admin ~]$ ceph-deploy purge ceph1 ceph2 ceph3
清除配置資訊
[cephuser@ceph-admin ~]$ ceph-deploy purgedata ceph1 ceph2 ceph3
[cephuser@ceph-admin ~]$ ceph-deploy forgetkeys
每個節點刪除殘留的配置檔案
[cephuser@ceph-admin ~]$ sudo rm -rf /var/lib/ceph/osd/*
[cephuser@ceph-admin ~]$ sudo rm -rf /var/lib/ceph/mon/*
[cephuser@ceph-admin ~]$ sudo rm -rf /var/lib/ceph/mds/*
[cephuser@ceph-admin ~]$ sudo rm -rf /var/lib/ceph/bootstrap-mds/*
[cephuser@ceph-admin ~]$ sudo rm -rf /var/lib/ceph/bootstrap-osd/*
[cephuser@ceph-admin ~]$ sudo rm -rf /var/lib/ceph/bootstrap-mon/*
[cephuser@ceph-admin ~]$ sudo rm -rf /var/lib/ceph/tmp/*
[cephuser@ceph-admin ~]$ sudo rm -rf /etc/ceph/*
[cephuser@ceph-admin ~]$ sudo rm -rf /var/run/ceph/*
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檢視ceph命令，關於ceph osd、ceph mds、ceph mon、ceph pg的命令
[cephuser@ceph-admin ~]$ ceph --help
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如下報錯
[cephuser@ceph-admin ~]$ ceph osd tree
2018-06-06 14:56:27.843841 7f8a0b6dd700 -1 auth: unable to find a keyring on /etc/ceph/ceph.client.admin.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin: (2) No such file or directory
2018-06-06 14:56:27.843853 7f8a0b6dd700 -1 monclient(hunting): ERROR: missing keyring, cannot use cephx for authentication
2018-06-06 14:56:27.843854 7f8a0b6dd700 0 librados: client.admin initialization error (2) No such file or directory
Error connecting to cluster: ObjectNotFound
[cephuser@ceph-admin ~]$ ceph osd stat
2018-06-06 14:55:58.165882 7f377a1c9700 -1 auth: unable to find a keyring on /etc/ceph/ceph.client.admin.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin: (2) No such file or directory
2018-06-06 14:55:58.165894 7f377a1c9700 -1 monclient(hunting): ERROR: missing keyring, cannot use cephx for authentication
2018-06-06 14:55:58.165896 7f377a1c9700 0 librados: client.admin initialization error (2) No such file or directory
解決辦法：
[cephuser@ceph-admin ~]$ sudo chmod 644 /etc/ceph/ceph.client.admin.keyring
[cephuser@ceph-admin ~]$ ceph osd stat
osdmap e35: 3 osds: 3 up, 3 in
flags sortbitwise,require_jewel_osds
[cephuser@ceph-admin ~]$ ceph osd tree
ID WEIGHT TYPE NAME UP/DOWN REWEIGHT PRIMARY-AFFINITY
-1 0.04376 root default
-2 0.01459 host ceph-node1
0 0.01459 osd.0 up 1.00000 1.00000
-3 0.01459 host ceph-node2
1 0.01459 osd.1 up 1.00000 1.00000
-4 0.01459 host ceph-node3
2 0.01459 osd.2 up 1.00000 1.00000