1 环境配置

1.1 设备列表

功能	主机名	IP
mon	node1	192.168.1.10
mon	node2	192.168.1.11
mon	node3	192.168.1.12

1.2 系统版本

[root@node1 ~]# cat /etc/redhat-release
CentOS Linux release 7.5.1804 (Core)[root@node2 ~]# cat /etc/redhat-release
CentOS Linux release 7.5.1804 (Core)[root@node3 ~]# cat /etc/redhat-release
CentOS Linux release 7.5.1804 (Core)

1.3 配置yum源

这里使用的是阿里的yum源

wget -qO /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
wget -qO /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

除了配置CentOS源和epel源，还需要添加ceph的源，这里也是使用的阿里的源

[root@node1 ~]# cat /etc/yum.repos.d/Aliyun-ceph.repo
[ceph]
name=ceph
baseurl=https://mirrors.aliyun.com/ceph/rpm-jewel/el7/x86_64/
gpgcheck=0
[ceph-noarch]
name=cephnoarch
baseurl=https://mirrors.aliyun.com/ceph/rpm-jewel/el7/noarch/
gpgcheck=0

注：ceph源配置文件需要手动生成

2 部署mon

2.1 安装ceph软件包

在3个节点分别执行以下安装命令

[root@node1 ~]# yum -y install ceph ceph-radosgw
[root@node2 ~]# yum -y install ceph ceph-radosgw
[root@node3 ~]# yum -y install ceph ceph-radosgw

2.2 创建第一个mon节点

1、登录到node1，查看ceph目录是否已经生成

[root@node1 ~]# ls /etc/ceph/
rbdmap

2、生成ceph配置文件

[root@node1 ~]# touch /etc/ceph/ceph.conf

3、执行uuidgen命令，得到一个唯一的标识，作为ceph集群的ID

[root@node1 ~]# uuidgen
bdfb36e0-23ed-4e2f-8bc6-b98d9fa9136c

4、配置ceph.conf

[root@node1 ~]# vim /etc/ceph/ceph.conf
[global]
fsid = bdfb36e0-23ed-4e2f-8bc6-b98d9fa9136c
#设置node1为mon节点
mon initial members = node1
#设置mon节点地址
mon host = 192.168.1.10
public network = 192.168.1.0/24
auth cluster required = cephx
auth service required = cephx
auth client required = cephx
osd journal size = 1024
#设置副本数
osd pool default size = 3
#设置最小副本数
osd pool default min size = 1
osd pool default pg num = 64
osd pool default pgp num = 64
osd crush chooseleaf type = 1
osd_mkfs_type = xfs
max mds = 5
mds max file size = 100000000000000
mds cache size = 1000000
#设置osd节点down后900s，把此osd节点逐出ceph集群，把之前映射到此节点的数据映射到其他节点。
mon osd down out interval = 900[mon]
#把时钟偏移设置成0.5s，默认是0.05s,由于ceph集群中存在异构PC，导致时钟偏移总是大于0.05s，为了方便同步直接把时钟偏移设置成0.5s
mon clock drift allowed = .50

5、为监控节点创建管理密钥

[root@node1 ~]# ceph-authtool --create-keyring /tmp/ceph.mon.keyring --gen-key -n mon. --cap mon 'allow *'
creating /tmp/ceph.mon.keyring

6、为ceph amin用户创建管理集群的密钥并赋予访问权限

[root@node1 ~]# sudo ceph-authtool --create-keyring /etc/ceph/ceph.client.admin.keyring --gen-key -n client.admin --set-uid=0 --cap mon 'allow *' --cap osd 'allow *' --cap mds 'allow *' --cap mgr 'allow *'
creating /etc/ceph/ceph.client.admin.keyring

7、生成一个引导-osd密钥环，生成一个client.bootstrap-osd用户并将用户添加到密钥环中

[root@node1 ~]# sudo ceph-authtool --create-keyring /var/lib/ceph/bootstrap-osd/ceph.keyring --gen-key -n client.bootstrap-osd --cap mon 'profile bootstrap-osd'
creating /var/lib/ceph/bootstrap-osd/ceph.keyring

8、将生成的密钥添加到ceph.mon.keyring

[root@node1 ~]# sudo ceph-authtool /tmp/ceph.mon.keyring --import-keyring /etc/ceph/ceph.client.admin.keyring
importing contents of /etc/ceph/ceph.client.admin.keyring into /tmp/ceph.mon.keyring
[root@node1 ~]# sudo ceph-authtool /tmp/ceph.mon.keyring --import-keyring /var/lib/ceph/bootstrap-osd/ceph.keyring
importing contents of /var/lib/ceph/bootstrap-osd/ceph.keyring into /tmp/ceph.mon.keyring

9、使用主机名、主机IP地址(ES)和FSID生成monmap。把它保存成/tmp/monmap

[root@node1 ~]# monmaptool --create --add node1 192.168.1.10 --fsid bdfb36e0-23ed-4e2f-8bc6-b98d9fa9136c /tmp/monmap
monmaptool: monmap file /tmp/monmap
monmaptool: set fsid to bdfb36e0-23ed-4e2f-8bc6-b98d9fa9136c
monmaptool: writing epoch 0 to /tmp/monmap (1 monitors)

10、创建一个默认的数据目录

[root@node1 ~]# sudo -u ceph mkdir /var/lib/ceph/mon/ceph-node1

11、修改ceph.mon.keyring属主和属组为ceph

[root@node1 ~]# chown ceph.ceph /tmp/ceph.mon.keyring

12、初始化mon

[root@node1 ~]# sudo -u ceph ceph-mon --mkfs -i node1 --monmap /tmp/monmap --keyring /tmp/ceph.mon.keyring
ceph-mon: set fsid to bdfb36e0-23ed-4e2f-8bc6-b98d9fa9136c
ceph-mon: created monfs at /var/lib/ceph/mon/ceph-node1 for mon.node1

13、为了防止重新被安装创建一个空的done文件

[root@node1 ~]# sudo touch /var/lib/ceph/mon/ceph-node1/done

14、启动mon

[root@node1 ~]# systemctl start ceph-mon@node1

15、查看运行状态

[root@node1 ~]# systemctl status ceph-mon@node1
● ceph-mon@node1.service - Ceph cluster monitor daemonLoaded: loaded (/usr/lib/systemd/system/ceph-mon@.service; disabled; vendor preset: disabled)Active: active (running) since Fri 2018-06-29 13:36:27 CST; 5min agoMain PID: 1936 (ceph-mon)

16、设置mon开机自动启动

[root@node1 ~]# systemctl enable ceph-mon@node1
Created symlink from /etc/systemd/system/ceph-mon.target.wants/ceph-mon@node1.service to /usr/lib/systemd/system/ceph-mon@.service.

2.3 新增mon节点node2

1、把node1上生成的配置文件和密钥文件拷贝到node2

[root@node1 ~]# scp /etc/ceph/* root@node2:/etc/ceph/
[root@node1 ~]# scp /var/lib/ceph/bootstrap-osd/ceph.keyring root@node2:/var/lib/ceph/bootstrap-osd/
[root@node1 ~]# scp /tmp/ceph.mon.keyring root@node2:/tmp/ceph.mon.keyring

2、在node2上创建一个默认的数据目录

[root@node2 ~]# sudo -u ceph mkdir /var/lib/ceph/mon/ceph-node2

3、在node2上修改ceph.mon.keyring属主和属组为ceph

[root@node2 ~]# chown ceph.ceph /tmp/ceph.mon.keyring

4、获取密钥和monmap信息

[root@node2 ~]# ceph auth get mon. -o /tmp/ceph.mon.keyring
exported keyring for mon.
[root@node2 ~]# ceph mon getmap -o /tmp/ceph.mon.map
got monmap epoch 1

5、初始化mon

[root@node2 ~]# sudo -u ceph ceph-mon --mkfs -i node2 --monmap /tmp/ceph.mon.map --keyring /tmp/ceph.mon.keyring
ceph-mon: set fsid to 8ca723b0-c350-4807-9c2a-ad6c442616aa
ceph-mon: created monfs at /var/lib/ceph/mon/ceph-node2 for mon.node2

6、为了防止重新被安装创建一个空的done文件

[root@node2 ~]# sudo touch /var/lib/ceph/mon/ceph-node2/done

7、将新的mon节点添加至ceph集群的mon列表

[root@node2 ~]# ceph mon add node2 192.168.1.11:6789
adding mon.node2 at 192.168.1.11:6789/0

8、启动新添加的mon

[root@node2 ~]# systemctl start ceph-mon@node2
[root@node2 ~]# systemctl status ceph-mon@node2
● ceph-mon@node2.service - Ceph cluster monitor daemonLoaded: loaded (/usr/lib/systemd/system/ceph-mon@.service; disabled; vendor preset: disabled)Active: active (running) since Sat 2018-06-30 10:58:52 CST; 6s agoMain PID: 1555 (ceph-mon)

9、设置mon开机自动启动

[root@node2 ~]# systemctl enable ceph-mon@node2
Created symlink from /etc/systemd/system/ceph-mon.target.wants/ceph-mon@node2.service to /usr/lib/systemd/system/ceph-mon@.service.

2.4 新增mon节点node3

1、把node1上生成的配置文件和密钥文件拷贝到node3

[root@node1 ~]# scp /etc/ceph/* root@node3:/etc/ceph/
[root@node1 ~]# scp /var/lib/ceph/bootstrap-osd/ceph.keyring root@node3:/var/lib/
[root@node1 ~]# scp /tmp/ceph.mon.keyring root@node3:/tmp/ceph.mon.keyring

2、在node3上创建一个默认的数据目录

[root@node3 ~]# sudo -u ceph mkdir /var/lib/ceph/mon/ceph-node3

3、在node3上修改ceph.mon.keyring属主和属组为ceph

[root@node3 ~]# chown ceph.ceph /tmp/ceph.mon.keyring

4、获取密钥和monmap信息

[root@node3 ~]# ceph auth get mon. -o /tmp/ceph.mon.keyring
exported keyring for mon.
[root@node3 ~]# ceph mon getmap -o /tmp/ceph.mon.map
got monmap epoch 1

5、初始化mon

[root@node3 ~]# sudo -u ceph ceph-mon --mkfs -i node3 --monmap /tmp/ceph.mon.map --keyring /tmp/ceph.mon.keyring
ceph-mon: set fsid to 8ca723b0-c350-4807-9c2a-ad6c442616aa
ceph-mon: created monfs at /var/lib/ceph/mon/ceph-node3 for mon.node3

6、为了防止重新被安装创建一个空的done文件

[root@node3 ~]# sudo touch /var/lib/ceph/mon/ceph-node3/done

7、将新的mon节点添加至ceph集群的mon列表

[root@node3 ~]# ceph mon add node3 192.168.1.12:6789
adding mon.node3 at 192.168.1.12:6789/0

8、启动新添加的mon

[root@node3 ~]# systemctl start ceph-mon@node3
[root@node3 ~]# systemctl status ceph-mon@node3
● ceph-mon@node3.service - Ceph cluster monitor daemonLoaded: loaded (/usr/lib/systemd/system/ceph-mon@.service; disabled; vendor preset: disabled)Active: active (running) since Sat 2018-06-30 11:16:00 CST; 4s agoMain PID: 1594 (ceph-mon)

9、设置mon开机自动启动

[root@node3 ~]# systemctl enable ceph-mon@node3
Created symlink from /etc/systemd/system/ceph-mon.target.wants/ceph-mon@node3.service to /usr/lib/systemd/system/ceph-mon@.service.

3个mon创建完成后可以通过ceph -s查看集群状态

[root@node1 ~]# ceph -scluster 8ca723b0-c350-4807-9c2a-ad6c442616aahealth HEALTH_ERR64 pgs are stuck inactive for more than 300 seconds64 pgs stuck inactive64 pgs stuck uncleanno osdsmonmap e3: 3 mons at {node1=192.168.1.10:6789/0,node2=192.168.1.11:6789/0,node3=192.168.1.12:6789/0}election epoch 12, quorum 0,1,2 node1,node2,node3osdmap e1: 0 osds: 0 up, 0 inflags sortbitwise,require_jewel_osdspgmap v2: 64 pgs, 1 pools, 0 bytes data, 0 objects0 kB used, 0 kB / 0 kB avail64 creating

注：当前状态中的error是由于还没有添加osd

3 部署osd

1、添加osd之前现在crush图中创建3个名称分别为node1，node2，node3的桶

[root@node1 ~]# ceph osd crush add-bucket node1 host
added bucket node1 type host to crush map
[root@node1 ~]# ceph osd crush add-bucket node2 host
added bucket node2 type host to crush map
[root@node1 ~]# ceph osd crush add-bucket node3 host
added bucket node3 type host to crush map

2、把3个新添加的桶移动到默认的root下

[root@node1 ~]# ceph osd crush move node1 root=default
moved item id -2 name 'node1' to location {root=default} in crush map
[root@node1 ~]# ceph osd crush move node2 root=default
moved item id -3 name 'node2' to location {root=default} in crush map
[root@node1 ~]# ceph osd crush move node3 root=default
moved item id -4 name 'node3' to location {root=default} in crush map

3.1 创建第一个osd

1、创建osd

[root@node1 ~]# ceph osd create
0

注：0位osd的ID号，默认情况下会自动递增

2、准备磁盘

通过ceph-disk命令可以自动根据ceph.conf文件中的配置信息对磁盘进行分区

[root@node1 ~]# ceph-disk prepare /dev/sdb
Creating new GPT entries.
The operation has completed successfully.
The operation has completed successfully.
meta-data=/dev/sdb1              isize=2048   agcount=4, agsize=1245119 blks=                       sectsz=512   attr=2, projid32bit=1=                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=4980475, imaxpct=25=                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=2560, version=2=                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
The operation has completed successfully.

3、对第一个分区进行格式化

[root@node1 ~]# mkfs.xfs -f /dev/sdb1
meta-data=/dev/sdb1              isize=512    agcount=4, agsize=1245119 blks=                       sectsz=512   attr=2, projid32bit=1=                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=4980475, imaxpct=25=                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=2560, version=2=                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

4、创建osd默认的数据目录

[root@node1 ~]# mkdir -p /var/lib/ceph/osd/ceph-0

注：目录格式为ceph-$ID，第一步创建出的osd的ID为0，所以目录为ceph-0

5、对分区进行挂载

[root@node1 ~]# mount /dev/sdb1 /var/lib/ceph/osd/ceph-0/

6、添加自动挂载信息

[root@node1 ~]# echo "/dev/sdb1 /var/lib/ceph/osd/ceph-0 xfs defaults 0 0" >> /etc/fstab

7、初始化 OSD 数据目录

[root@node1 ~]# ceph-osd -i 0 --mkfs --mkkey
2018-06-30 11:31:19.791042 7f7cbd911880 -1 journal FileJournal::_open: disabling aio for non-block journal.  Use journal_force_aio to force use of aio anyway
2018-06-30 11:31:19.808367 7f7cbd911880 -1 journal FileJournal::_open: disabling aio for non-block journal.  Use journal_force_aio to force use of aio anyway
2018-06-30 11:31:19.814628 7f7cbd911880 -1 filestore(/var/lib/ceph/osd/ceph-0) could not find #-1:7b3f43c4:::osd_superblock:0# in index: (2) No such file or directory
2018-06-30 11:31:19.875860 7f7cbd911880 -1 created object store /var/lib/ceph/osd/ceph-0 for osd.0 fsid 8ca723b0-c350-4807-9c2a-ad6c442616aa
2018-06-30 11:31:19.875985 7f7cbd911880 -1 auth: error reading file: /var/lib/ceph/osd/ceph-0/keyring: can't open /var/lib/ceph/osd/ceph-0/keyring: (2) No such file or directory
2018-06-30 11:31:19.876241 7f7cbd911880 -1 created new key in keyring /var/lib/ceph/osd/ceph-0/keyring

8、添加key

[root@node1 ~]# ceph auth add osd.0 osd 'allow *' mon 'allow profile osd' -i /var/lib/ceph/osd/ceph-0/keyring
added key for osd.0

9、把新建的osd添加到crush中

[root@node1 ~]# ceph osd crush add osd.0 1.0 host=node1
add item id 0 name 'osd.0' weight 1 at location {host=node1} to crush map

10、修改osd数据目录的属主和属组为ceph

[root@node1 ~]# chown -R ceph:ceph /var/lib/ceph/osd/ceph-0/

11、启动新添加的osd

[root@node1 ~]# systemctl start ceph-osd@0
[root@node1 ~]# systemctl status ceph-osd@0
● ceph-osd@0.service - Ceph object storage daemonLoaded: loaded (/usr/lib/systemd/system/ceph-osd@.service; disabled; vendor preset: disabled)Active: active (running) since Sat 2018-06-30 11:32:58 CST; 4s agoProcess: 3408 ExecStartPre=/usr/lib/ceph/ceph-osd-prestart.sh --cluster ${CLUSTER} --id %i (code=exited, status=0/SUCCESS)Main PID: 3459 (ceph-osd)

12、设置osd开机自动启动

[root@node1 ~]# systemctl enable ceph-osd@0
Created symlink from /etc/systemd/system/ceph-osd.target.wants/ceph-osd@0.service to /usr/lib/systemd/system/ceph-osd@.service.

13、查看ceph osd tree状态

[root@node1 ~]# ceph osd tree
ID WEIGHT  TYPE NAME      UP/DOWN REWEIGHT PRIMARY-AFFINITY
-1 1.00000 root default
-2 1.00000     host node1                                  0 1.00000         osd.0       up  1.00000          1.00000
-3       0     host node2
-4       0     host node3

3.2 添加新的osd

和添加第一个osd的方法一样，这里写了个简单的添加脚本，可以通过脚本快速进行一下添加

[root@node1 ~]# sh osd.sh
Select the disk: sdc
Select the host: node1
Cleanup OSD ID is done.
Directory is done.
Prepare OSD Disk is done.
Add OSD is done

脚本内容（此脚本是根据当前环境写的，实际使用过程中需要根据环境状况进行调整）

#!/bin/bash
read -p "Select the disk: " DISK
read -p "Select the host: " HOST
##### Cleanup OSD ID #####
for i in $(ceph osd dump | grep new | awk '{print $1}' | awk -F"." '{print $2}')doceph osd rm $iceph auth del osd.$i
done
echo -e "\033[40;32mCleanup OSD ID is done.\033[0m"
ID=$(ceph osd create)
DIRECTORY=/var/lib/ceph/osd/ceph-$ID
##### Create OSD Directory #####
if [ -d $DIRECTORY ] ;thenrm -rf $DIRECTORY
fi
mkdir -p $DIRECTORY
if [ $? = 0 ] ; thenecho -e "\033[40;32mDirectory is done.\033[0m"
elsebreak
fi
##### Prepare OSD Disk #####
blkid | grep $DISK | grep ceph &> /dev/zero
if [ $? != 0 ] ; thenceph-disk zap /dev/$DISK &> /dev/zeroceph-disk prepare /dev/$DISK &> /dev/zero
elsecontinue
fi
PARTITION=/dev/${DISK}1
mkfs.xfs -f $PARTITION &> /dev/zero
echo "$PARTITION $DIRECTORY xfs rw,noatime,attr2,inode64,noquota 0 0" >> /etc/fstab
mount -o rw,noatime,attr2,inode64,noquota $PARTITION $DIRECTORY
if [ $? = 0 ] ; thenecho -e "\033[40;32mPrepare OSD Disk is done.\033[0m"
elsebreak
fi
##### Add OSD #####
ceph-osd -i $ID --mkfs --mkkey &> /dev/zero
ceph auth add osd.$ID osd 'allow *' mon 'allow profile osd' -i $DIRECTORY/keyring &> /dev/zero
ceph osd crush add osd.$ID 1.0 host=$HOST &> /dev/zero
chown -R ceph:ceph /var/lib/ceph/osd
systemctl start ceph-osd@$ID &> /dev/zero
systemctl enable ceph-osd@$ID &> /dev/zero
systemctl status ceph-osd@$ID &> /dev/zero
if [ $? = 0 ] ; thenecho -e "\033[40;32mAdd OSD is done\033[0m"
fi

osd添加完成后查看ceph osd tree 状态

[root@node1 ~]# ceph osd tree
ID WEIGHT  TYPE NAME      UP/DOWN REWEIGHT PRIMARY-AFFINITY
-1 9.00000 root default
-2 3.00000     host node1                                  6 1.00000         osd.6       up  1.00000          1.000001 1.00000         osd.1       up  1.00000          1.000004 1.00000         osd.4       up  1.00000          1.00000
-3 3.00000     host node2                                  7 1.00000         osd.7       up  1.00000          1.000002 1.00000         osd.2       up  1.00000          1.000005 1.00000         osd.5       up  1.00000          1.00000
-4 3.00000     host node3                                  0 1.00000         osd.0       up  1.00000          1.000003 1.00000         osd.3       up  1.00000          1.000008 1.00000         osd.8       up  1.00000          1.00000

4 状态修复

4.1 too few PGs per OSD

1、通过ceph -s查看状态

[root@node1 ~]# ceph -scluster ffcb01ea-e7e3-4097-8551-dde0256f610ahealth HEALTH_WARNtoo few PGs per OSD (21 < min 30)monmap e3: 3 mons at {node1=192.168.1.10:6789/0,node2=192.168.1.11:6789/0,node3=192.168.1.12:6789/0election epoch 8, quorum 0,1,2 node1,node2,node3osdmap e52: 9 osds: 9 up, 9 inflags sortbitwise,require_jewel_osdspgmap v142: 64 pgs, 1 pools, 0 bytes data, 0 objects9519 MB used, 161 GB / 170 GB avail64 active+clean

HEALTH_WARN 提示PG太小

PG计算方式

total PGs = ((Total_number_of_OSD * 100) / max_replication_count) / pool_count

当前ceph集群是9个osd，3副本，1个默认的rbd pool

所以PG计算结果为300，一般把这个值设置为与计算结果最接近的2的幂数，跟300比较接近的是256

2、查看当前的PG值

[root@node1 ~]# ceph osd pool get rbd pg_num
pg_num: 64
[root@node1 ~]# ceph osd pool get rbd pgp_num
pgp_num: 64

3、手动设置

[root@node1 ~]# ceph osd pool set rbd pg_num 256
set pool 0 pg_num to 256
[root@node1 ~]# ceph osd pool set rbd pgp_num 256
set pool 0 pgp_num to 256

4、再次查看状态

[root@node1 ~]# ceph -scluster ffcb01ea-e7e3-4097-8551-dde0256f610ahealth HEALTH_WARNclock skew detected on mon.node2, mon.node3Monitor clock skew detectedmonmap e3: 3 mons at {node1=192.168.1.10:6789/0,node2=192.168.1.11:6789/0,node3=192.168.1.12:6789/0}election epoch 16, quorum 0,1,2 node1,node2,node3osdmap e56: 9 osds: 9 up, 9 inflags sortbitwise,require_jewel_osdspgmap v160: 256 pgs, 1 pools, 0 bytes data, 0 objects9527 MB used, 161 GB / 170 GB avail256 active+clean

4.2 Monitor clock skew detected

在上个查看结果中出现了一个新的warn，这个一般是由于mon节点的时间偏差比较大，可以修改ceph.conf中的时间偏差值参数来进行修复

修改结果：

[mon]
mon clock drift allowed = 2
mon clock drift warn backoff = 30

再次查看状态

[root@node1 ~]# ceph -scluster ffcb01ea-e7e3-4097-8551-dde0256f610ahealth HEALTH_OKmonmap e3: 3 mons at {node1=192.168.1.10:6789/0,node2=192.168.1.11:6789/0,node3=192.168.1.12:6789/0}election epoch 22, quorum 0,1,2 node1,node2,node3osdmap e56: 9 osds: 9 up, 9 inflags sortbitwise,require_jewel_osdspgmap v160: 256 pgs, 1 pools, 0 bytes data, 0 objects9527 MB used, 161 GB / 170 GB avail256 active+clean

注：生产环境中可以通过配置时间同步解决此状况

5 部署mds

5.1 创建第一个mds

1、为mds元数据服务器创建一个目录

[root@node1 ~]# mkdir -p /var/lib/ceph/mds/ceph-node1

2、为bootstrap-mds客户端创建一个密钥注：(如果下面的密钥在目录里已生成可以省略此步骤）

[root@node1 ~]# ceph-authtool --create-keyring /var/lib/ceph/bootstrap-mds/ceph.keyring --gen-key -n client.bootstrap-mds
creating /var/lib/ceph/bootstrap-mds/ceph.keyring

3、在ceph auth库中创建bootstrap-mds客户端，赋予权限添加之前创建的密钥注（查看ceph auth list 用户权限认证列表如果已有client.bootstrap-mds此用户，此步骤可以省略）

[root@node1 ~]# ceph auth add client.bootstrap-mds mon 'allow profile bootstrap-mds' -i /var/lib/ceph/bootstrap-mds/ceph.keyring

4、在root家目录里创建ceph.bootstrap-mds.keyring文件

[root@node1 ~]# touch /root/ceph.bootstrap-mds.keyring

5、把keyring /var/lib/ceph/bootstrap-mds/ceph.keyring里的密钥导入家目录下的ceph.bootstrap-mds.keyring文件里

[root@node1 ~]# ceph-authtool --import-keyring /var/lib/ceph/bootstrap-mds/ceph.keyring ceph.bootstrap-mds.keyring
importing contents of /var/lib/ceph/bootstrap-mds/ceph.keyring into ceph.bootstrap-mds.keyring

6、在ceph auth库中创建mds.node1用户，并赋予权限和创建密钥，密钥保存在/var/lib/ceph/mds/ceph-node1/keyring文件里

[root@node1 ~]# ceph --cluster ceph --name client.bootstrap-mds --keyring /var/lib/ceph/bootstrap-mds/ceph.keyring auth get-or-create mds.node1 osd 'allow rwx' mds 'allow' mon 'allow profile mds' -o /var/lib/ceph/mds/ceph-node1/keyring

7、启动mds

[root@node1 ~]# systemctl start ceph-mds@node1
[root@node1 ~]# systemctl status ceph-mds@node1
● ceph-mds@node1.service - Ceph metadata server daemonLoaded: loaded (/usr/lib/systemd/system/ceph-mds@.service; disabled; vendor preset: disabled)Active: active (running) since Mon 2018-07-02 10:54:17 CST; 5s agoMain PID: 18319 (ceph-mds)

8、设置mds开机自动启动

[root@node1 ~]# systemctl enable ceph-mds@node1
Created symlink from /etc/systemd/system/ceph-mds.target.wants/ceph-mds@node1.service to /usr/lib/systemd/system/ceph-mds@.service.

5.2 添加第二个mds

1、拷贝密钥文件到node2

[root@node1 ~]# scp ceph.bootstrap-mds.keyring node2:/root/ceph.bootstrap-mds.keyring
[root@node1 ~]# scp /var/lib/ceph/bootstrap-mds/ceph.keyring node2:/var/lib/ceph/bootstrap-mds/ceph.keyring

2、在node2上创建mds元数据目录

[root@node2 ~]# mkdir -p /var/lib/ceph/mds/ceph-node2

3、在ceph auth库中创建mds.node1用户，并赋予权限和创建密钥，密钥保存在/var/lib/ceph/mds/ceph-node2/keyring文件里

[root@node2 ~]# ceph --cluster ceph --name client.bootstrap-mds --keyring /var/lib/ceph/bootstrap-mds/ceph.keyring auth get-or-create mds.node2 osd 'allow rwx' mds 'allow' mon 'allow profile mds' -o /var/lib/ceph/mds/ceph-node2/keyring

4、启动mds

[root@node2 ~]# systemctl start ceph-mds@node2
[root@node2 ~]# systemctl status ceph-mds@node2
● ceph-mds@node2.service - Ceph metadata server daemonLoaded: loaded (/usr/lib/systemd/system/ceph-mds@.service; disabled; vendor preset: disabled)Active: active (running) since Mon 2018-07-02 11:21:09 CST; 3s agoMain PID: 14164 (ceph-mds)

5、设置mds开机自动启动

[root@node2 ~]# systemctl enable ceph-mds@node2
Created symlink from /etc/systemd/system/ceph-mds.target.wants/ceph-mds@node2.service to /usr/lib/systemd/system/ceph-mds@.service.

5.3 添加第三个mds

1、拷贝密钥文件到node3

[root@node1 ~]# scp ceph.bootstrap-mds.keyring node3:/root/ceph.bootstrap-mds.keyring
[root@node1 ~]# scp /var/lib/ceph/bootstrap-mds/ceph.keyring node3:/var/lib/ceph/bootstrap-mds/ceph.keyring

2、在node3上创建mds元数据目录

[root@node3 ~]# mkdir -p /var/lib/ceph/mds/ceph-node3