1、环境准备
·准备三台虚机，每个虚机配合三块数据盘，2块网卡，一个网卡设置外网，一个网卡设置成内网
·配置文件设置（根据实际情况配置每一个节点）
    -编辑 letc/sysconfig/network-scripts/ifcfg-ethO 文件（外网），添加
        ONBOOT=yes 
        BOOTPROTO=dhcp 
    -编辑 letc/sysconfig/network scripts/ifcfg-eth 文件（内网），添加:
        ONBOOT=yes 
        BOOTPROTO=static 
        IPADDR=192.168.20.180
        NETMASK=255.255.255.0
    -修改每个节点的hostname
    [root@ceph-node-1 ceph]# cat /etc/sysconfig/network
    HOSTNAME=ceph-node1

    -编辑 /etc/hosts 文件，添加:
        192.168.20.180 ceph-node1
        192.168.20.40  ceph-node2
        192.168.20.81  ceph-node3

·配置三个节点免密登录（每一个节点都需要操作，一下是在节点ceph-node1上执行的例子）
    #ssh-keygen
    #sh-copy-id ceph-node2 ceph-node3
·所有节点增加yum配置文件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

2、安装ceph-depoy
在ceph-node1节点上执行yum install -y ceph-deploy

3、在管理节点创建monitor服务
    mkdir /etc/ceph && cd /etc/ceph
    ceph-deploy new ceph-node1
    执行成功后，该目录下面会生成如下配置文件
    [root@ceph-node-1 ceph]# ls
    ceph.conf  ceph-deploy-ceph.log  ceph.log  ceph.mon.keyring  rbdmap
    修改ceph配置文件的副本个数
        [root@ceph-node-1 ceph]# cat ceph.conf
        [global]
        fsid = a28ff2de-6ea9-459f-aca1-e7ee21efc075
        mon_initial_members = ceph-node1
        mon_host = 192.168.20.180
        auth_cluster_required = cephx
        auth_service_required = cephx
        auth_client_required = cephx
        osd_pool_default_size = 2
4、在所有节点上面安装ceph
[root@ceph-node-1 ceph]# ceph-deploy install ceph-node1 ceph-node2 ceph-node3
执行结束之后，执行ceph --version来检查ceph版本和健康状况

5、创建第一个monitor
ceph-deploy mon create-initial
安装成功后执行ceph status
[root@ceph-node-1 ceph]# ceph status
    cluster a28ff2de-6ea9-459f-aca1-e7ee21efc075
     health HEALTH_ERR
            64 pgs are stuck inactive for more than 300 seconds
            64 pgs stuck inactive
            64 pgs stuck unclean
            no osds
     monmap e1: 1 mons at {ceph-node1=192.168.20.180:6789/0}
            election epoch 3, quorum 0 ceph-node1
     osdmap e1: 0 osds: 0 up, 0 in
            flags sortbitwise,require_jewel_osds
      pgmap v2: 64 pgs, 1 pools, 0 bytes data, 0 objects
            0 kB used, 0 kB / 0 kB avail
                  64 creating
6、创建osd
查询disk 列表
ceph-deploy disk list ceph-node1 ceph-node2 ceph-node3
删除已有的磁盘分区和数据
ceph-deploy disk zap ceph-node1:vdb ceph-node1:vdc ceph-node1:vdd
[root@ceph-node-1 ceph]# ceph status
    cluster a28ff2de-6ea9-459f-aca1-e7ee21efc075
     health HEALTH_ERR
            64 pgs are stuck inactive for more than 300 seconds
            64 pgs stuck inactive
            64 pgs stuck unclean
            no osds
     monmap e1: 1 mons at {ceph-node1=192.168.20.180:6789/0}
            election epoch 3, quorum 0 ceph-node1
     osdmap e1: 0 osds: 0 up, 0 in
            flags sortbitwise,require_jewel_osds
      pgmap v2: 64 pgs, 1 pools, 0 bytes data, 0 objects
            0 kB used, 0 kB / 0 kB avail
                  64 creating
创建新的文件系统
ceph-deploy osd create ceph-node1:vdb ceph-node1:vdc ceph-node1:vdd
[root@ceph-node-1 ceph]# ceph status
    cluster a28ff2de-6ea9-459f-aca1-e7ee21efc075
     health HEALTH_WARN
            24 pgs degraded
            64 pgs stuck unclean
            24 pgs undersized
            too few PGs per OSD (21 < min 30)
     monmap e1: 1 mons at {ceph-node1=192.168.20.180:6789/0}
            election epoch 3, quorum 0 ceph-node1
     osdmap e15: 3 osds: 3 up, 3 in; 40 remapped pgs
            flags sortbitwise,require_jewel_osds
      pgmap v28: 64 pgs, 1 pools, 0 bytes data, 0 objects
            322 MB used, 15004 MB / 15326 MB avail
                  40 active
                  24 active+undersized+degraded
同样的方法在其他节点创建osd，所有的操作都是在节点ceph-node1上执行，只在一个节点上配置osd，集群的状态是不健康的，需要在其他节点构造冗余的osd，集群才会健康

7、纵向扩展ceph，添加monitor和osd
osd只需要使用和步骤6同样的步骤在其他磁盘或者其他节点的磁盘创建osd即可
下面说下monitor的扩展，首先需要将monitor所在的几个节点的防火墙关闭
# service iptables stop 
# chkconfig iptables off 
# ssh ceph-node2 service iptables stop 
# ssh ceph-node2 chkconfig iptables off 
# ssh ceph- node3 service iptables stop 
# ssh ceph-node3 chkconfig iptables off
在其他节点上部署monitor
现在配置文件中添加public网段配置
[root@ceph-node-1 ceph]# cat /etc/ceph/ceph.conf
[global]
fsid = a28ff2de-6ea9-459f-aca1-e7ee21efc075
mon_initial_members = ceph-node1
mon_host = 192.168.20.180
auth_cluster_required = cephx
auth_service_required = cephx
auth_client_required = cephx
osd_pool_default_size = 2
public network = 10.100.3.0/24

将配置同步到别的节点
ceph-deploy --overwrite-conf config push ceph-node1 ceph-node2 ceph-node3

添加monitor
ceph-deploy mon create ceph-node2 ceph-node3

执行status查看结果
[root@ceph-node-1 ceph]# ceph status
    cluster a28ff2de-6ea9-459f-aca1-e7ee21efc075
     health HEALTH_WARN
            too few PGs per OSD (14 < min 30)
     monmap e3: 3 mons at {ceph-node1=192.168.20.180:6789/0,ceph-node2=10.100.3.226:6789/0,ceph-node3=10.100.3.192:6789/0}
            election epoch 8, quorum 0,1,2 ceph-node3,ceph-node2,ceph-node1
     osdmap e47: 9 osds: 9 up, 9 in
            flags sortbitwise,require_jewel_osds
      pgmap v117: 64 pgs, 1 pools, 0 bytes data, 0 objects
            971 MB used, 45009 MB / 45980 MB avail
                  64 active+clean
至此，ceph集群搭建完毕 共有3个监听器和9个osd