6. 客户端挂载

#mkdir /mnt/ceph
#mount -t ceph ceph_mds:/ /mnt/ceph
遇以下错误：
（1）
[root@localhost ~]# mount -t ceph ceph_mds:/ /mnt/ceph/
mount: wrong fs type, bad option, bad superblock on ceph_mds:/,
missing codepage or helper program, or other error
(for several filesystems (e.g. nfs, cifs) you might
need a /sbin/mount.<type> helper program)
In some cases useful info is found in syslog- try
dmesg | tail or so
查看#dmesg
ceph: Unknown symbol ceph_con_keepalive (err0)
ceph: Unknown symbol ceph_create_client (err 0)
ceph: Unknown symbol ceph_calc_pg_primary (err0)
ceph: Unknown symbol ceph_osdc_release_request (err0)
ceph: Unknown symbol ceph_con_open (err 0)
ceph: Unknown symbol ceph_flags_to_mode (err 0)
ceph: Unknown symbol ceph_msg_last_put (err 0)
ceph: Unknown symbol ceph_caps_for_mode (err 0)
ceph: Unknown symbol ceph_copy_page_vector_to_user (err0)
ceph: Unknown symbol ceph_msg_new (err 0)
ceph: Unknown symbol ceph_msg_type_name (err 0)
ceph: Unknown symbol ceph_pagelist_truncate (err0)
ceph: Unknown symbol ceph_release_page_vector (err0)
ceph: Unknown symbol ceph_check_fsid (err 0)
ceph: Unknown symbol ceph_pagelist_reserve (err0)
ceph: Unknown symbol ceph_pagelist_append (err0)
ceph: Unknown symbol ceph_calc_object_layout (err0)
ceph: Unknown symbol ceph_get_direct_page_vector (err0)
ceph: Unknown symbol ceph_osdc_wait_request (err0)
ceph: Unknown symbol ceph_osdc_new_request (err0)
ceph: Unknown symbol ceph_pagelist_set_cursor (err0)
ceph: Unknown symbol ceph_calc_file_object_mapping (err0)
ceph: Unknown symbol ceph_monc_got_mdsmap (err0)
ceph: Unknown symbol ceph_osdc_readpages (err 0)
ceph: Unknown symbol ceph_con_send (err 0)
ceph: Unknown symbol ceph_zero_page_vector_range (err0)
ceph: Unknown symbol ceph_osdc_start_request (err0)
ceph: Unknown symbol ceph_compare_options (err0)
ceph: Unknown symbol ceph_msg_dump (err 0)
ceph: Unknown symbol ceph_buffer_new (err 0)
ceph: Unknown symbol ceph_put_page_vector (err0)
ceph: Unknown symbol ceph_pagelist_release (err0)
ceph: Unknown symbol ceph_osdc_sync (err 0)
ceph: Unknown symbol ceph_destroy_client (err 0)
ceph: Unknown symbol ceph_copy_user_to_page_vector (err0)
ceph: Unknown symbol __ceph_open_session (err 0)
ceph: Unknown symbol ceph_alloc_page_vector (err0)
ceph: Unknown symbol ceph_monc_do_statfs (err 0)
ceph: Unknown symbol ceph_monc_validate_auth (err0)
ceph: Unknown symbol ceph_osdc_writepages (err0)
ceph: Unknown symbol ceph_parse_options (err 0)
ceph: Unknown symbol ceph_str_hash (err 0)
ceph: Unknown symbol ceph_pr_addr (err 0)
ceph: Unknown symbol ceph_buffer_release (err 0)
ceph: Unknown symbol ceph_con_init (err 0)
ceph: Unknown symbol ceph_destroy_options (err0)
ceph: Unknown symbol ceph_con_close (err 0)
ceph: Unknown symbol ceph_msgr_flush (err 0)
Key type ceph registered
libceph: loaded (mon/osd proto15/24, osdmap5/65/6)
ceph: loaded (mds proto 32)
libceph: parse_ips bad ip 'ceph_mds'
ceph: loaded (mds proto 32)
libceph: parse_ips bad ip 'ceph_mds'
我发现客户端mount命令根本没有ceph类型（无"mount.ceph"），而我们配置的其他节点都有mount.ceph，所以我在ceph客户端上也重新编译了最新版的ceph-0.60。
（2）编译安装ceph-0.60后mount还是报同样的错，查看dmesg
#dmesg | tail
Key type ceph unregistered
Key type ceph registered
libceph: loaded (mon/osd proto15/24, osdmap5/65/6)
ceph: loaded (mds proto 32)
libceph: parse_ips bad ip 'ceph_mds'
libceph: no secret set (for auth_x protocol)
libceph: error -22 on auth protocol 2 init
libceph: client4102 fsid 652b09fb-bbbf-424c-bd49-8218d75465ba
 

最终查明原因，是因为mount时还需要输入用户名和密钥，具体mount命令为：
#mount.ceph ceph_mds:/ /mnt/ceph -v -o name=admin,secret=AQCXnKhRgMltJRAAi0WMqr+atKFPaIV4Aja4hQ==
[root@localhost ~]# mount.ceph ceph_mds:/ /mnt/ceph -v -o name=admin,secret=AQCXnKhRgMltJRAAi0WMqr+atKFPaIV4Aja4hQ==
parsing options: name=admin,secret=AQCXnKhRgMltJRAAi0WMqr+atKFPaIV4Aja4hQ==
上述命令中的name和secret参数值来自monitor的/etc/ceph/keyring文件：
 

[root@ceph_mds ceph]# cat /etc/ceph/keyring
[client.admin]
key = AQCXnKhRgMltJRAAi0WMqr+atKFPaIV4Aja4hQ==
查看客户端的挂载情况：
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
50G 13G 35G 27%/
tmpfs 2.0G 02.0G0%/dev/shm
/dev/sda1 477M 48M 405M11%/boot
/dev/mapper/VolGroup-lv_home
405G 71M 385G 1%/home
222.31.76.178:/ 300G 6.1G 294G 3% /mnt/ceph

P.S. 网上说若不想每次输入密钥这么繁琐，可以在配置文件ceph.conf中加入以下字段（并记得同步到其他节点），但我实验发现还是无效，所以暂且采用上述方法挂载使用，有哪位朋友知道我错在哪欢迎指出啊。
[mount /]
allow = %everyone
 
 

到此Ceph的安装配置就已全部完成，可以在客户端的/mnt/ceph目录下使用Ceph分布式文件系统。
近期我还将进行Ceph的功能性验证测试，测试报告敬请期待！