Ceph存储搭建及在k8s中的使用

心已赠人 2022-12-16 13:02 217阅读 0赞

## 一、基础环境准备 ##

<table> 
 <thead> 
  <tr> 
   <th>主机IP</th> 
   <th>主机名</th> 
   <th>部署服务</th> 
   <th>备注</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>192.168.0.91</td> 
   <td>admin-node</td> 
   <td>ceph、ceph-deploy、mon</td> 
   <td>mon节点又称为master节点</td> 
  </tr> 
  <tr> 
   <td>192.168.0.92</td> 
   <td>ceph01</td> 
   <td>ceph</td> 
   <td>osd</td> 
  </tr> 
  <tr> 
   <td>192.168.0.93</td> 
   <td>ceph02</td> 
   <td>ceph</td> 
   <td>osd</td> 
  </tr> 
 </tbody> 
</table>

Ceph版本 10.2.11 Ceph-deploy版本 7.6.1810 内核版本 3.10.0-957.el7.x86\_64

每个节点关闭防火墙和selinux
    [root@admin-node ~]# systemctl stop firewalld
    [root@admin-node ~]# systemctl disable firewalld
    [root@admin-node ~]# sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
    [root@admin-node ~]# setenforce 0
    
    每个节点设置时间同步
    [root@admin-node ~]# yum -y install ntp ntpdate ntp-doc
    [root@admin-node ~]# systemctl enable ntpd
    [root@admin-node ~]# systemctl start ntpd
    [root@admin-node ~]# /usr/sbin/ntpdate ntp1.aliyun.com
    [root@admin-node ~]# hwclock --systohc
    [root@admin-node ~]# timedatectl set-timezone Asia/Shanghai
    
    每个节点修改主机名
    [root@admin-node ~]# hostnamectl set-hostname admin-node
    [root@ceph01 ~]# hostnamectl set-hostname ceph01
    [root@ceph02 ~]# hostnamectl set-hostname ceph02
    
    每个节点修改hosts
    [root@admin-node ~]# cat >> /etc/hosts <<EOF
    192.168.0.91 admin-node
    192.168.0.92 ceph01
    192.168.0.93 ceph02
    EOF
    
    设置yum源
    [root@admin-node ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
    [root@admin-node ~]# wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
    [root@admin-node ~]# yum clean all && yum makecache
    
    添加ceph源
    [root@admin-node ~]# cat > /etc/yum.repos.d/ceph.repo <<EOF
    [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
    EOF
    
    缓存yum源
    [root@admin-node ~]# yum clean all && yum makecache
    
    每个节点创建cephuser用户并设置sudo权限
    [root@admin-node ~]# useradd -d /home/cephuser -m cephuser
    [root@admin-node ~]# echo "cephuser"|passwd --stdin cephuser
    [root@admin-node ~]# echo "cephuser ALL = (root) NOPASSWD:ALL" | sudo tee /etc/sudoers.d/cephuser
    [root@admin-node ~]# chmod 0440 /etc/sudoers.d/cephuser
    [root@admin-node ~]# sed -i s'/Defaults requiretty/#Defaults requiretty'/g /etc/sudoers
    
    测试cephuser的sudo权限
    [root@admin-node ~]# su - cephuser
    [cephuser@admin-node ~]$ sudo su -
    
    因为ceph-deploy不支持输入密码，所以必须要配置master节点与每个Ceph节点的ssh无密码登录。
    [root@admin-node ~]# su - cephuser
    [cephuser@admin-node ~]$ ssh-keygen -t rsa
    [cephuser@admin-node ~]$ ssh-copy-id cephuser@admin-node
    [cephuser@admin-node ~]$ ssh-copy-id cephuser@ceph01
    [cephuser@admin-node ~]$ ssh-copy-id cephuser@ceph02

## 二、准备磁盘 ##

三台主机上都添加一块30G大小的硬盘，我这里是在vmware上添加，比较简单。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3djMTY5NTA0MDg0Mg_size_16_color_FFFFFF_t_70_pic_center]

添加好硬盘之后，用fdisk查看下
    [cephuser@admin-node ~]$ sudo fdisk -l
    
    Disk /dev/sda: 53.7 GB, 53687091200 bytes, 104857600 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
    Disk label type: dos
    Disk identifier: 0x000a93ad
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1   *        2048   104857599    52427776   83  Linux
    
    Disk /dev/sdb: 32.2 GB, 32212254720 bytes, 62914560 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
    
    
    对磁盘进行分区，分别输入“n”，“p”，“1”，然后会两次回车，再输入“w”。
    [cephuser@admin-node ~]$ sudo fdisk /dev/sdb
    Welcome to fdisk (util-linux 2.23.2).
    
    Changes will remain in memory only, until you decide to write them.
    Be careful before using the write command.
    
    Device does not contain a recognized partition table
    Building a new DOS disklabel with disk identifier 0x8aec5f5a.
    
    Command (m for help): n
    Partition type:
       p   primary (0 primary, 0 extended, 4 free)
       e   extended
    Select (default p): p
    Partition number (1-4, default 1): 1
    First sector (2048-62914559, default 2048): 
    Using default value 2048
    Last sector, +sectors or +size{ K,M,G} (2048-62914559, default 62914559): 
    Using default value 62914559
    Partition 1 of type Linux and of size 30 GiB is set
    
    Command (m for help): w
    The partition table has been altered!
    
    Calling ioctl() to re-read partition table.
    Syncing disks.
    
    
    然后用fdisk -l就可以看到已经分区的磁盘了
    [cephuser@admin-node ~]$ sudo fdisk -l
    
    Disk /dev/sdb: 32.2 GB, 32212254720 bytes, 62914560 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
    Disk label type: dos
    Disk identifier: 0x8aec5f5a
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sdb1            2048    62914559    31456256   83  Linux
    
    格式化分区
    [cephuser@admin-node ~]$ sudo mkfs.xfs /dev/sdb1
    meta-data=/dev/sdb1              isize=512    agcount=4, agsize=1966016 blks
             =                       sectsz=512   attr=2, projid32bit=1
             =                       crc=1        finobt=0, sparse=0
    data     =                       bsize=4096   blocks=7864064, imaxpct=25
             =                       sunit=0      swidth=0 blks
    naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
    log      =internal log           bsize=4096   blocks=3839, version=2
             =                       sectsz=512   sunit=0 blks, lazy-count=1
    realtime =none                   extsz=4096   blocks=0, rtextents=0
    
    添加到/etc/fstab
    [root@admin-node ~]# echo '/dev/sdb1 /ceph xfs defaults 0 0' >> /etc/fstab
    [root@admin-node ~]# mkdir /ceph
    [root@admin-node ~]# mount -a
    [root@admin-node ~]# df -h
    Filesystem      Size  Used Avail Use% Mounted on
    /dev/sda1        50G  1.7G   49G   4% /
    devtmpfs        1.9G     0  1.9G   0% /dev
    tmpfs           1.9G     0  1.9G   0% /dev/shm
    tmpfs           1.9G   12M  1.9G   1% /run
    tmpfs           1.9G     0  1.9G   0% /sys/fs/cgroup
    tmpfs           378M     0  378M   0% /run/user/0
    /dev/sdb1        30G   33M   30G   1% /ceph

## 三、部署 ##

使用ceph-deploy工具部署ceph集群，在master节点上新建一个ceph集群，使用ceph-deploy来管理三个节点。

[root@admin-node ~]# su - cephuser
    [cephuser@admin-node ~]$ sudo yum -y install ceph ceph-deploy

创建cluster目录

[cephuser@admin-node ~]$ mkdir cluster
    [cephuser@admin-node ~]$ cd cluster/

在master节点创建monitor

[cephuser@admin-node cluster]$ ceph-deploy new admin-node
    [ceph_deploy.conf][DEBUG ] found configuration file at: /home/cephuser/.cephdeploy.conf
    [ceph_deploy.cli][INFO  ] Invoked (1.5.39): /bin/ceph-deploy new admin-node
    [ceph_deploy.cli][INFO  ] ceph-deploy options:
    [ceph_deploy.cli][INFO  ]  username                      : None
    [ceph_deploy.cli][INFO  ]  func                          : <function new at 0x7f27b483f5f0>
    [ceph_deploy.cli][INFO  ]  verbose                       : False
    [ceph_deploy.cli][INFO  ]  overwrite_conf                : False
    [ceph_deploy.cli][INFO  ]  quiet                         : False
    [ceph_deploy.cli][INFO  ]  cd_conf                       : <ceph_deploy.conf.cephdeploy.Conf instance at 0x7f27b3fbc5a8>
    [ceph_deploy.cli][INFO  ]  cluster                       : ceph
    [ceph_deploy.cli][INFO  ]  ssh_copykey                   : True
    [ceph_deploy.cli][INFO  ]  mon                           : ['admin-node']
    [ceph_deploy.cli][INFO  ]  public_network                : None
    [ceph_deploy.cli][INFO  ]  ceph_conf                     : None
    [ceph_deploy.cli][INFO  ]  cluster_network               : None
    [ceph_deploy.cli][INFO  ]  default_release               : False
    [ceph_deploy.cli][INFO  ]  fsid                          : None
    [ceph_deploy.new][DEBUG ] Creating new cluster named ceph
    [ceph_deploy.new][INFO  ] making sure passwordless SSH succeeds
    [admin-node][DEBUG ] connection detected need for sudo
    [admin-node][DEBUG ] connected to host: admin-node 
    [admin-node][DEBUG ] detect platform information from remote host
    [admin-node][DEBUG ] detect machine type
    [admin-node][DEBUG ] find the location of an executable
    [admin-node][INFO  ] Running command: sudo /usr/sbin/ip link show
    [admin-node][INFO  ] Running command: sudo /usr/sbin/ip addr show
    [admin-node][DEBUG ] IP addresses found: [u'192.168.0.91']
    [ceph_deploy.new][DEBUG ] Resolving host admin-node
    [ceph_deploy.new][DEBUG ] Monitor admin-node at 192.168.0.91
    [ceph_deploy.new][DEBUG ] Monitor initial members are ['admin-node']
    [ceph_deploy.new][DEBUG ] Monitor addrs are ['192.168.0.91']
    [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...
    
    执行这条命令之后，admin-node节点作为了monitor节点，如果想多个mon节点可以实现互备，需要加上其他节点并且节点需要安装ceph-deploy

当上面的步骤执行完成之后，在cluster目录下会产生ceph.conf文件，这里需要修改ceph.conf文件（注意：mon\_host必须和public network网络是同网段的），添加下面4行：

osd pool default size = 3
    rbd_default_features = 1
    public network = 192.168.0.0/24
    osd journal size = 2000
    
    
    解释如下：
    # osd pool default size = 3
    设置默认副本数为3份，有一个副本故障，其他2个副本的osd可正常提供服务，需要注意的是如果设置为副本数为3，osd总数量需要是3的倍数。
    
    # rbd_default_features = 1
    增加 rbd_default_features 配置可以永久的改变默认值。注意：这种方式设置是永久性的，要注意在集群各个node上都要修改。
    
    # public network = 192.168.0.0/24
    设置集群所在的网段
    
    # osd journal size = 2000
    OSD日志大小，单位是MB

安装ceph

这个过程有点长，需要等待一段时间

[cephuser@admin-node cluster]$ ceph-deploy install admin-node ceph01 ceph02

master节点初始化mon节点及收集秘钥信息

cephuser@admin-node cluster]$ ceph-deploy mon create-initial
    [ceph_deploy.conf][DEBUG ] found configuration file at: /home/cephuser/.cephdeploy.conf
    [ceph_deploy.cli][INFO  ] Invoked (1.5.39): /bin/ceph-deploy mon create-initial
    [ceph_deploy.cli][INFO  ] ceph-deploy options:
    [ceph_deploy.cli][INFO  ]  username                      : None
    [ceph_deploy.cli][INFO  ]  verbose                       : False
    [ceph_deploy.cli][INFO  ]  overwrite_conf                : False
    [ceph_deploy.cli][INFO  ]  subcommand                    : create-initial
    [ceph_deploy.cli][INFO  ]  quiet                         : False
    [ceph_deploy.cli][INFO  ]  cd_conf                       : <ceph_deploy.conf.cephdeploy.Conf instance at 0x7fbc00e79ef0>
    [ceph_deploy.cli][INFO  ]  cluster                       : ceph
    [ceph_deploy.cli][INFO  ]  func                          : <function mon at 0x7fbc00e566e0>
    [ceph_deploy.cli][INFO  ]  ceph_conf                     : None
    [ceph_deploy.cli][INFO  ]  default_release               : False
    [ceph_deploy.cli][INFO  ]  keyrings                      : None
    [ceph_deploy.mon][DEBUG ] Deploying mon, cluster ceph hosts admin-node
    [ceph_deploy.mon][DEBUG ] detecting platform for host admin-node ...
    [admin-node][DEBUG ] connection detected need for sudo
    [admin-node][DEBUG ] connected to host: admin-node 
    ......
    [admin-node][INFO  ] Running command: sudo /usr/bin/ceph --connect-timeout=25 --cluster=ceph --name mon. --keyring=/var/lib/ceph/mon/ceph-admin-node/keyring auth get client.bootstrap-rgw
    [ceph_deploy.gatherkeys][INFO  ] Storing ceph.client.admin.keyring
    [ceph_deploy.gatherkeys][INFO  ] Storing ceph.bootstrap-mds.keyring
    [ceph_deploy.gatherkeys][INFO  ] Storing ceph.bootstrap-mgr.keyring
    [ceph_deploy.gatherkeys][INFO  ] keyring 'ceph.mon.keyring' already exists
    [ceph_deploy.gatherkeys][INFO  ] Storing ceph.bootstrap-osd.keyring
    [ceph_deploy.gatherkeys][INFO  ] Storing ceph.bootstrap-rgw.keyring
    [ceph_deploy.gatherkeys][INFO  ] Destroy temp directory /tmp/tmpmLTa1b

**在master节点创建osd：**

创建osd
    [cephuser@admin-node cluster]$ ceph-deploy osd prepare admin-node:/ceph ceph01:/ceph ceph02:/ceph
    
    激活osd
    在激活之前需要先将/ceph目录的权限改为ceph。因为从I版本起，ceph的守护进程以ceph用户而不是root用户运行。而osd在prepare和activate之前需要将硬盘挂载到指定目录去。而创建指定目录（例如/ceph）时，用户可能是非ceph用户例如root用户等。
    [cephuser@admin-node cluster]$ sudo chown -R ceph:ceph /ceph
    [cephuser@admin-node cluster]$ ceph-deploy osd activate admin-node:/ceph ceph01:/ceph ceph02:/ceph

master创建mon节点-监控集群状态-同时管理集群及msd

[cephuser@admin-node cluster]$ ceph-deploy mon create admin-node
    如果需要管理集群节点，需要在node节点安装ceph-deploy，因为ceph-deploy是管理ceph节点的工具。
    如果需要增加其他的mon机器，可以使用 ceph-deploy mon add  主机名

修改秘钥权限

[cephuser@admin-node cluster]$ sudo chmod 644 /etc/ceph/ceph.client.admin.keyring

检查ceph状态

[cephuser@admin-node cluster]$ sudo ceph health
    HEALTH_OK
    [cephuser@admin-node cluster]$ sudo ceph -s
        cluster e76f5c31-89d6-4d5f-a302-8f1faf17655e
         health HEALTH_OK
         monmap e1: 1 mons at { admin-node=192.168.0.91:6789/0}
                election epoch 4, quorum 0 admin-node
         osdmap e15: 3 osds: 3 up, 3 in
                flags sortbitwise,require_jewel_osds
          pgmap v31: 64 pgs, 1 pools, 0 bytes data, 0 objects
                6321 MB used, 85790 MB / 92112 MB avail
                      64 active+clean
    [cephuser@admin-node cluster]$ ceph osd stat
         osdmap e15: 3 osds: 3 up, 3 in
                flags sortbitwise,require_jewel_osds

检查osd运行状态

[cephuser@admin-node cluster]$ ceph osd stat
         osdmap e15: 3 osds: 3 up, 3 in
                flags sortbitwise,require_jewel_osds

查看ceph集群磁盘

[cephuser@admin-node cluster]$ ceph df
    GLOBAL:
        SIZE       AVAIL      RAW USED     %RAW USED 
        92112M     85790M        6321M          6.86 
    POOLS:
        NAME     ID     USED     %USED     MAX AVAIL     OBJECTS 
        rbd      0         0         0        27061M           0 
    
    这里3台服务器每台30G硬盘组成90G

查看osd节点状态

[cephuser@admin-node cluster]$ ceph osd tree
    ID WEIGHT  TYPE NAME           UP/DOWN REWEIGHT PRIMARY-AFFINITY 
    -1 0.08789 root default                                          
    -2 0.02930     host admin-node                                   
     0 0.02930         osd.0            up  1.00000          1.00000 
    -3 0.02930     host ceph01                                       
     1 0.02930         osd.1            up  1.00000          1.00000 
    -4 0.02930     host ceph02                                       
     2 0.02930         osd.2            up  1.00000          1.00000

查看osd的状态-负责数据存放的位置

[cephuser@admin-node cluster]$ ceph-deploy osd list admin-node ceph01 ceph02
    [ceph_deploy.conf][DEBUG ] found configuration file at: /home/cephuser/.cephdeploy.conf
    [ceph_deploy.cli][INFO  ] Invoked (1.5.39): /bin/ceph-deploy osd list admin-node ceph01 ceph02
    [ceph_deploy.cli][INFO  ] ceph-deploy options:
    [ceph_deploy.cli][INFO  ]  username                      : None
    [ceph_deploy.cli][INFO  ]  verbose                       : False
    [ceph_deploy.cli][INFO  ]  overwrite_conf                : False
    [ceph_deploy.cli][INFO  ]  subcommand                    : list
    [ceph_deploy.cli][INFO  ]  quiet                         : False
    [ceph_deploy.cli][INFO  ]  cd_conf                       : <ceph_deploy.conf.cephdeploy.Conf instance at 0x7f614b4ba170>
    [ceph_deploy.cli][INFO  ]  cluster                       : ceph
    [ceph_deploy.cli][INFO  ]  func                          : <function osd at 0x7f614b4fdf50>
    [ceph_deploy.cli][INFO  ]  ceph_conf                     : None
    [ceph_deploy.cli][INFO  ]  default_release               : False
    [ceph_deploy.cli][INFO  ]  disk                          : [('admin-node', None, None), ('ceph01', None, None), ('ceph02', None, None)]
    [admin-node][DEBUG ] connection detected need for sudo
    [admin-node][DEBUG ] connected to host: admin-node 
    [admin-node][DEBUG ] detect platform information from remote host
    [admin-node][DEBUG ] detect machine type
    [admin-node][DEBUG ] find the location of an executable
    [admin-node][DEBUG ] find the location of an executable
    [admin-node][INFO  ] Running command: sudo /bin/ceph --cluster=ceph osd tree --format=json
    [admin-node][DEBUG ] connection detected need for sudo
    [admin-node][DEBUG ] connected to host: admin-node 
    [admin-node][DEBUG ] detect platform information from remote host
    [admin-node][DEBUG ] detect machine type
    [admin-node][DEBUG ] find the location of an executable
    [admin-node][INFO  ] Running command: sudo /usr/sbin/ceph-disk list
    [admin-node][INFO  ] ----------------------------------------
    [admin-node][INFO  ] ceph-0
    [admin-node][INFO  ] ----------------------------------------
    [admin-node][INFO  ] Path           /var/lib/ceph/osd/ceph-0
    [admin-node][INFO  ] ID             0
    [admin-node][INFO  ] Name           osd.0
    [admin-node][INFO  ] Status         up
    [admin-node][INFO  ] Reweight       1.0
    [admin-node][INFO  ] Active         ok
    [admin-node][INFO  ] Magic          ceph osd volume v026
    [admin-node][INFO  ] Whoami         0
    [admin-node][INFO  ] Journal path   /ceph/journal
    [admin-node][INFO  ] ----------------------------------------
    [ceph01][DEBUG ] connection detected need for sudo
    [ceph01][DEBUG ] connected to host: ceph01 
    [ceph01][DEBUG ] detect platform information from remote host
    [ceph01][DEBUG ] detect machine type
    [ceph01][DEBUG ] find the location of an executable
    [ceph01][INFO  ] Running command: sudo /usr/sbin/ceph-disk list
    [ceph01][INFO  ] ----------------------------------------
    [ceph01][INFO  ] ceph-1
    [ceph01][INFO  ] ----------------------------------------
    [ceph01][INFO  ] Path           /var/lib/ceph/osd/ceph-1
    [ceph01][INFO  ] ID             1
    [ceph01][INFO  ] Name           osd.1
    [ceph01][INFO  ] Status         up
    [ceph01][INFO  ] Reweight       1.0
    [ceph01][INFO  ] Active         ok
    [ceph01][INFO  ] Magic          ceph osd volume v026
    [ceph01][INFO  ] Whoami         1
    [ceph01][INFO  ] Journal path   /ceph/journal
    [ceph01][INFO  ] ----------------------------------------
    [ceph02][DEBUG ] connection detected need for sudo
    [ceph02][DEBUG ] connected to host: ceph02 
    [ceph02][DEBUG ] detect platform information from remote host
    [ceph02][DEBUG ] detect machine type
    [ceph02][DEBUG ] find the location of an executable
    [ceph02][INFO  ] Running command: sudo /usr/sbin/ceph-disk list
    [ceph02][INFO  ] ----------------------------------------
    [ceph02][INFO  ] ceph-2
    [ceph02][INFO  ] ----------------------------------------
    [ceph02][INFO  ] Path           /var/lib/ceph/osd/ceph-2
    [ceph02][INFO  ] ID             2
    [ceph02][INFO  ] Name           osd.2
    [ceph02][INFO  ] Status         up
    [ceph02][INFO  ] Reweight       1.0
    [ceph02][INFO  ] Active         ok
    [ceph02][INFO  ] Magic          ceph osd volume v026
    [ceph02][INFO  ] Whoami         2
    [ceph02][INFO  ] Journal path   /ceph/journal
    [ceph02][INFO  ] ----------------------------------------

查看集群mon选举状态

[cephuser@admin-node cluster]$ ceph quorum_status --format json-pretty
    
    { 
        "election_epoch": 4,
        "quorum": [
            0
        ],
        "quorum_names": [
            "admin-node"
        ],
        "quorum_leader_name": "admin-node",
        "monmap": { 
            "epoch": 1,
            "fsid": "e76f5c31-89d6-4d5f-a302-8f1faf17655e",
            "modified": "2020-09-28 15:18:13.294522",
            "created": "2020-09-28 15:18:13.294522",
            "mons": [
                { 
                    "rank": 0,
                    "name": "admin-node",
                    "addr": "192.168.0.91:6789\/0"
                }
            ]
        }
    }

创建文件的系统

先查看管理节点状态，默认是没有管理节点的
    [cephuser@admin-node ~]$ ceph mds stat
    e1:
    
    创建管理节点（admin-node作为管理节点）
    需要注意：如果不创建mds管理节点的，client客户端将不能正常挂载到ceph集群！！
    
    [cephuser@admin-node ~]$ cd /home/cephuser/cluster/
    [cephuser@admin-node cluster]$ ceph-deploy mds create admin-node
    
    再次查看管理节点状态，发现已经在启动中了
    [cephuser@admin-node cluster]$ ceph mds stat
    e2:, 1 up:standby
    
    创建pool池，pool是ceph存储数据时的逻辑分区，它起到namespace的作用
    [cephuser@admin-node cluster]$ ceph osd lspools #先查看pool
    0 rbd,
    
    新创建的ceph集群只有rdb一个pool。这时需要创建一个新的pool
    [cephuser@admin-node cluster]$ ceph osd pool create cephfs_data 128 #后面的数据是pg的数量
    pool 'cephfs_data' created 
    ##命令格式##
    #创建pool
    ceph osd pool create [pool池名称] 128
    #删除pool
    ceph osd pool delete [pool池名称]
    #调整副本数量
    ceph osd pool set [pool池名称] size 2
    ###
    
    [cephuser@admin-node cluster]$ ceph osd pool create cephfs_metadata 128 #pool的元数据
    pool 'cephfs_metadata' created
    
    [cephuser@admin-node cluster]$ ceph fs new mycephfs cephfs_metadata cephfs_data
    new fs with metadata pool 2 and data pool 1
    
    再次查看pool状态
    [cephuser@admin-node cluster]$ ceph osd lspools
    0 rbd,1 cephfs_data,2 cephfs_metadata,
    
    检查mds管理节点状态
    [cephuser@admin-node cluster]$ ceph mds stat
    e5: 1/1/1 up { 0=admin-node=up:active}
    
    检查ceph集群状态
    [cephuser@admin-node cluster]$ ceph -s
        cluster e76f5c31-89d6-4d5f-a302-8f1faf17655e
         health HEALTH_WARN
                too many PGs per OSD (320 > max 300)
         monmap e1: 1 mons at { admin-node=192.168.0.91:6789/0}
                election epoch 5, quorum 0 admin-node
          fsmap e5: 1/1/1 up { 0=admin-node=up:active}
         osdmap e29: 3 osds: 3 up, 3 in
                flags sortbitwise,require_jewel_osds
          pgmap v248: 320 pgs, 3 pools, 2068 bytes data, 20 objects
                6323 MB used, 85788 MB / 92112 MB avail
                     320 active+clean

挂载到服务器的目录中

由于我这里的cephfs存储是用来给pod中的java应用存放日志的，所以可以将cephfs存储挂载到一台服务器上，方便查看日志。

查看并记录admin用户的key，admin用户默认就存在，不需要创建
    [cephuser@admin-node cluster]$ ceph auth get-key client.admin
    AQA2jnFfBT8QBRAAd504A08U+Jlk/pt6TkcS4Q==
    
    查看用户权限
    [cephuser@admin-node cluster]$ ceph auth get client.admin
    exported keyring for client.admin
    [client.admin]
            key = AQA2jnFfBT8QBRAAd504A08U+Jlk/pt6TkcS4Q==
            caps mds = "allow *"
            caps mon = "allow *"
            caps osd = "allow *"
    
    查看ceph授权
    [cephuser@admin-node cluster]$ ceph auth list
    installed auth entries:
    
    mds.admin-node
            key: AQCj+XNfUd6qLBAAERbdVdkbeV3AmKyxvDLDyA==
            caps: [mds] allow
            caps: [mon] allow profile mds
            caps: [osd] allow rwx
    osd.0
            key: AQAZqHJfsM7fCxAAX4BRw+HxNAPMezGpKKTafw==
            caps: [mon] allow profile osd
            caps: [osd] allow *
    osd.1
            key: AQDMqHJfJxAIAhAAyccoTUr5PciteZ5X/vTRLw==
            caps: [mon] allow profile osd
            caps: [osd] allow *
    osd.2
            key: AQDXqHJfkilwCBAAtw2QqKZ6LATMijK/8Ggi7Q==
            caps: [mon] allow profile osd
            caps: [osd] allow *
    client.admin
            key: AQA2jnFfBT8QBRAAd504A08U+Jlk/pt6TkcS4Q==
            caps: [mds] allow *
            caps: [mon] allow *
            caps: [osd] allow *
    client.bootstrap-mds
            key: AQA2jnFfRdOMLRAA9LuyGs5YsZYfH+Mu4wQrsA==
            caps: [mon] allow profile bootstrap-mds
    client.bootstrap-mgr
            key: AQA5jnFfp87tDxAAtx4rvkE7OIobER2iKQDyew==
            caps: [mon] allow profile bootstrap-mgr
    client.bootstrap-osd
            key: AQA2jnFfocEJFRAArMJYW9Bjd8B3zT/PpsRZJg==
            caps: [mon] allow profile bootstrap-osd
    client.bootstrap-rgw
            key: AQA2jnFfrOQqIRAAmH3v7pvVNBmy5CqxtxeNsg==
            caps: [mon] allow profile bootstrap-rgw
    
    在客户机上挂载
    客户机需要安装ceph，具体yum源上面已经写过，这里不再赘述
    [root@localhost ~]# yum -y install ceph
    [root@localhost ~]# mkdir /mnt/cephfs
    root@localhost ~]# mount.ceph 192.168.0.91:6789:/ /mnt/cephfs/ -o name=admin,secret=AQA2jnFfBT8QBRAAd504A08U+Jlk/pt6TkcS4Q==
    [root@localhost ~]# df -h
    Filesystem           Size  Used Avail Use% Mounted on
    /dev/sda1             50G  2.0G   48G   4% /
    devtmpfs             1.9G     0  1.9G   0% /dev
    tmpfs                1.9G     0  1.9G   0% /dev/shm
    tmpfs                1.9G   12M  1.9G   1% /run
    tmpfs                1.9G     0  1.9G   0% /sys/fs/cgroup
    tmpfs                378M     0  378M   0% /run/user/0
    192.168.0.91:6789:/   90G  6.2G   84G   7% /mnt/cephfs
    并在fstab中加入以下配置：
    192.168.0.91:6789:/  /mnt/cephfs/ ceph     name=admin,secret=AQA2jnFfBT8QBRAAd504A08U+Jlk/pt6TkcS4Q==   0   0

创建Provisioner

注意点：
    1.需要在k8s的master和node节点中都安装ceph，因为我后面还要使用storageclass模式，还需要在k8s的master节点中安装ceph-common，否则会报错。
    2.因为只有cephfs(即文件类的存储)才能够支持ReadWriteMany，所以上面创建的是ceph的文件系统cephfs。
    3.在k8s中使用cephfs存储时，节点中必须安装ceph-fuse，不然会报错。
    
    创建秘钥
    ceph auth get-key client.admin > /opt/secret
    kubectl create ns cephfs
    kubectl create secret generic ceph-secret-admin --from-file=/opt/secret --namespace=cephfs
    
    部署Provisioner
    git clone https://github.com/kubernetes-retired/external-storage.git
    cd external-storage/ceph/cephfs/deploy
    NAMESPACE=cephfs
    sed -r -i "s/namespace: [^ ]+/namespace: $NAMESPACE/g" ./rbac/*.yaml
    sed -r -i "N;s/(name: PROVISIONER_SECRET_NAMESPACE.*\n[[:space:]]*)value:.*/\1value: $NAMESPACE/" ./rbac/deployment.yaml
    kubectl -n $NAMESPACE apply -f ./rbac
    
    检查pod的状态是否正常
    kubectl get pods -n cephfs
    
    创建Storageclass
    cat > storageclass.yaml <<EOF apiVersion: storage.k8s.io/v1 kind: StorageClass metadata: name: cephfs provisioner: ceph.com/cephfs parameters: monitors: 192.168.0.91:6789 #换成自己的ceph地址 adminId: admin adminSecretName: ceph-secret-admin adminSecretNamespace: cephfs claimRoot: /logs EOF
    kubectl apply -f storageclass.yaml 
    
    创建pvc
    cat > pvc.yaml <<EOF kind: PersistentVolumeClaim apiVersion: v1 metadata: name: claim1 spec: storageClassName: cephfs accessModes: - ReadWriteMany resources: requests: storage: 2Gi EOF
    kubectl apply -f pvc.yaml
    
    查看pvc
    kubectl get pvc
    NAME     STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
    claim1   Bound    pvc-7c1740a3-a3ab-4889-9d94-e50c736701fd   2Gi        RWX            cephfs         27m

上面创建好了StorageClass和PVC之后，我这边的java应用就可以直接使用这个pvc进行日志目录的挂载了，并且是多个pod可以同时使用同一个PVC的，这样方便了日志的管理和收集工作。

注意：在这里还是要再次强调下，ceph存储的文件系统cephfs才支持ReadWriteMany哦。

参考文章：  
[https://k.i4t.com/kubernetes\_ceph\_storageclass.html][https_k.i4t.com_kubernetes_ceph_storageclass.html]  
[https://www.cnblogs.com/kevingrace/p/9141432.html][https_www.cnblogs.com_kevingrace_p_9141432.html]  
[https://blog.csdn.net/qq\_42006894/article/details/88576446][https_blog.csdn.net_qq_42006894_article_details_88576446]  
[https://zhuanlan.zhihu.com/p/58602716][https_zhuanlan.zhihu.com_p_58602716]  
[https://www.cnblogs.com/sunsky303/p/12206485.html][https_www.cnblogs.com_sunsky303_p_12206485.html]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3djMTY5NTA0MDg0Mg_size_16_color_FFFFFF_t_70_pic_center]: /images/20221123/5dcb08d234804d6f9ec46f97c403248b.png
[https_k.i4t.com_kubernetes_ceph_storageclass.html]: https://k.i4t.com/kubernetes_ceph_storageclass.html
[https_www.cnblogs.com_kevingrace_p_9141432.html]: https://www.cnblogs.com/kevingrace/p/9141432.html
[https_blog.csdn.net_qq_42006894_article_details_88576446]: https://blog.csdn.net/qq_42006894/article/details/88576446
[https_zhuanlan.zhihu.com_p_58602716]: https://zhuanlan.zhihu.com/p/58602716
[https_www.cnblogs.com_sunsky303_p_12206485.html]: https://www.cnblogs.com/sunsky303/p/12206485.html