ceph技巧总结(一)
ceph技巧总结(一)
加油2018 发表于3年前
ceph技巧总结(一)
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摘要: 把平时看到的关于ceph的操作总结一下

1. ceph rbd在线resize

扩容前

[root@mon0 ceph]# rbd create myrbd/rbd1 -s 1024 --image-format=2
[root@mon0 ceph]# rbd ls myrbd
rbd1
[root@mon0 ceph]# rbd info myrbd/rbd1
rbd image 'rbd1':
	size 1024 MB in 256 objects
	order 22 (4096 kB objects)
	block_name_prefix: rbd_data.12ce6b8b4567
	format: 2
	features: layering

扩容

[root@mon0 ceph]# rbd resize myrbd/rbd1 -s 2048
Resizing image: 100% complete...done.
在rbd1未格式化和挂载之前,直接resize就可以了。如果rbd1已经格式化并挂载了,需要一些额外的操作:
[root@mon0 ceph]# rbd map myrbd/rbd1
[root@mon0 ceph]# rbd showmapped
id pool  image    snap device    
0  test  test.img -    /dev/rbd0 
1  myrbd rbd1     -    /dev/rbd1 
[root@mon0 ceph]# mkfs.xfs /dev/rbd1
log stripe unit (4194304 bytes) is too large (maximum is 256KiB)
log stripe unit adjusted to 32KiB
meta-data=/dev/rbd1              isize=256    agcount=9, agsize=64512 blks
         =                       sectsz=512   attr=2, projid32bit=0
data     =                       bsize=4096   blocks=524288, imaxpct=25
         =                       sunit=1024   swidth=1024 blks
naming   =version 2              bsize=4096   ascii-ci=0
log      =internal log           bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=8 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
[root@mon0 ceph]# mount /dev/rbd1 /mnt
[root@mon0 ceph]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1       529G   20G  482G   4% /
tmpfs            16G  408K   16G   1% /dev/shm
/dev/sdb        559G   33G  527G   6% /openstack
/dev/sdc        1.9T   75M  1.9T   1% /cephmp1
/dev/sdd        1.9T   61M  1.9T   1% /cephmp2
/dev/rbd1       2.0G   33M  2.0G   2% /mnt
[root@mon0 ceph]# rbd resize myrbd/rbd1 -s 4096
Resizing image: 100% complete...done.
[root@mon0 ceph]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1       529G   20G  482G   4% /
tmpfs            16G  408K   16G   1% /dev/shm
/dev/sdb        559G   33G  527G   6% /openstack
/dev/sdc        1.9T   75M  1.9T   1% /cephmp1
/dev/sdd        1.9T   61M  1.9T   1% /cephmp2
/dev/rbd1       2.0G   33M  2.0G   2% /mnt
[root@mon0 ceph]# xfs_growfs /mnt
meta-data=/dev/rbd1              isize=256    agcount=9, agsize=64512 blks
         =                       sectsz=512   attr=2, projid32bit=0
data     =                       bsize=4096   blocks=524288, imaxpct=25
         =                       sunit=1024   swidth=1024 blks
naming   =version 2              bsize=4096   ascii-ci=0
log      =internal               bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=8 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 524288 to 1048576
[root@mon0 ceph]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1       529G   20G  482G   4% /
tmpfs            16G  408K   16G   1% /dev/shm
/dev/sdb        559G   33G  527G   6% /openstack
/dev/sdc        1.9T   75M  1.9T   1% /cephmp1
/dev/sdd        1.9T   61M  1.9T   1% /cephmp2
/dev/rbd1       4.0G   33M  4.0G   1% /mnt
还有一种情况是,rbd1已经被挂载到一个vm上:
virsh domblklist myvm
rbd resize myrbd/rbd1
#这里需要通过virsh blockresize进行操作
virsh blockresize --domain myvm --path vdb --size 100G
rbd info myrbd/rbd1

2. 利用ceph-deploy

利用ceph-deploy安装ceph非常简单,可以在安装后根据需要调整ceph.conf。

mkdir ceph-deploy; cd ceph-deploy
ceph-deploy install $cluster
ceph-deploy new cephnode-01 cephnode-02 cephnode-03
ceph-deploy --overwrite-conf mon create cephnode-01 cephnode-02 cephnode-03
ceph-deploy gatherkeys cephnode-01
ceph-deploy osd create \
    cephnode-01:/dev/sdb:/dev/sda5 \
    cephnode-01:/dev/sdc:/dev/sda6 \
    cephnode-01:/dev/sdd:/dev/sda7 \
    cephnode-02:/dev/sdb:/dev/sda5 \
    cephnode-02:/dev/sdc:/dev/sda6 \
    cephnode-02:/dev/sdd:/dev/sda7 \
    cephnode-03:/dev/sdb:/dev/sda5 \
    cephnode-03:/dev/sdc:/dev/sda6 \
    cephnode-03:/dev/sdd:/dev/sda7 \
    cephnode-04:/dev/sdb:/dev/sda5 \
    cephnode-04:/dev/sdc:/dev/sda6 \
    cephnode-04:/dev/sdd:/dev/sda7 \
    cephnode-05:/dev/sdb:/dev/sda5 \
    cephnode-05:/dev/sdc:/dev/sda6 \
    cephnode-05:/dev/sdd:/dev/sda7
利用ceph-deploy进行卸载:
ceph-deploy purgedata $cluster
ceph-deploy purge $cluster

for host in $cluster
  do
    ssh $host <<EOF
      sudo dd if=/dev/zero of=/dev/sdb bs=1M count=100
      sudo dd if=/dev/zero of=/dev/sdc bs=1M count=100
      sudo dd if=/dev/zero of=/dev/sdd bs=1M count=100
      sudo sgdisk -g --clear /dev/sdb
      sudo sgdisk -g --clear /dev/sdc
      sudo sgdisk -g --clear /dev/sdd
    EOF
  done

3. 删除rbd前先删除相应快照

rbd snap ls myrbd/rbd1
SNAPID NAME       SIZE 
    10 snap1 102400 KB 
    12 snap2 102400 KB 
rbd snap purge myrbd/rbd1
Removing all snapshots: 100% complete...done.
rbd rm myrbd/rbd1
Removing image: 100% complete...done.

4. 测试rbd snap

创建并挂载rbd1:

[root@mon0 ceph]# rbd create myrbd/rbd1 -s 1024 --image-format=2
[root@mon0 ceph]# rbd map myrbd/rbd1
[root@mon0 ceph]# rbd showmapped
id pool  image    snap device    
0  test  test.img -    /dev/rbd0 
1  myrbd rbd1     -    /dev/rbd1 
[root@mon0 ceph]# mkfs.xfs /dev/rbd1
log stripe unit (4194304 bytes) is too large (maximum is 256KiB)
log stripe unit adjusted to 32KiB
meta-data=/dev/rbd1              isize=256    agcount=9, agsize=31744 blks
         =                       sectsz=512   attr=2, projid32bit=0
data     =                       bsize=4096   blocks=262144, imaxpct=25
         =                       sunit=1024   swidth=1024 blks
naming   =version 2              bsize=4096   ascii-ci=0
log      =internal log           bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=8 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
[root@mon0 ceph]# blkid|grep rbd1
/dev/rbd1: UUID="643b509f-406b-411b-b3a5-fa220fbdfe47" TYPE="xfs" 
[root@mon0 ceph]# mount /dev/rbd1 /mnt
[root@mon0 ceph]# mount | grep rbd1
/dev/rbd1 on /mnt type xfs (rw)
创建snap并回滚:
[root@mon0 ceph]# rbd snap ls myrbd/rbd1
SNAPID NAME     SIZE 
     2 snap1 1024 MB 
[root@mon0 ceph]# rbd snap rollback myrbd/rbd1@snap1
Rolling back to snapshot: 100% complete...done.
[root@mon0 ceph]# ls /mnt
v2
[root@mon0 ceph]# umount /mnt
[root@mon0 ceph]# mount /dev/rbd1 /mnt
[root@mon0 ceph]# ls /mnt
v1
通过快照挂载:
[root@mon0 ceph]# rbd map myrbd/rbd1@snap1
[root@mon0 ceph]# rbd showmapped
id pool  image    snap  device    
0  test  test.img -     /dev/rbd0 
1  myrbd rbd1     -     /dev/rbd1 
2  myrbd rbd1     snap1 /dev/rbd2 

[root@mon0 ceph]# mount -t xfs -o ro,norecovery,nouuid /dev/rbd2 /tmp
[root@mon0 ceph]# ls /tmp
v1

5. 定位文件位置

利用rados put上传并利用map查看文件

[root@osd2 software]# md5sum epel-release-6-8.noarch.rpm 
2cd0ae668a585a14e07c2ea4f264d79b  epel-release-6-8.noarch.rpm
[root@osd2 software]# rados put -p myrbd epel.rpm ./epel-release-6-8.noarch.rpm 
[root@osd2 software]# ceph osd map myrbd epel.rpm
osdmap e88 pool 'myrbd' (4) object 'epel.rpm' -> pg 4.e9ddf5be (4.be) -> up ([4,2], p4) acting ([4,2], p4)
查看所在位置并验证:
[root@osd2 software]# ceph osd tree
# id	weight	type name	up/down	reweight
-1	10.92	root default
-2	3.64		host mon0
0	1.82			osd.0	up	1	
1	1.82			osd.1	up	1	
-3	3.64		host osd1
2	1.82			osd.2	up	1	
3	1.82			osd.3	up	1	
-4	3.64		host osd2
4	1.82			osd.4	up	1	
5	1.82			osd.5	up	1	
[root@osd2 software]# cd /cephmp1/current/4.be_head/
[root@osd2 4.be_head]# ls
epel.rpm__head_E9DDF5BE__4
[root@osd2 4.be_head]# md5sum epel.rpm__head_E9DDF5BE__4 
2cd0ae668a585a14e07c2ea4f264d79b  epel.rpm__head_E9DDF5BE__4
[root@osd2 4.be_head]# ll -h
total 20K
-rw-r--r--. 1 root root 15K Nov  4 17:59 epel.rpm__head_E9DDF5BE__4
利用rbd input上传后进行验证:
[root@osd2 software]# touch hello.txt
[root@osd2 software]# echo "hello world" >> hello.txt
[root@osd2 software]# rbd import ./hello.txt myrbd/hello.txt
Importing image: 100% complete...done.
[root@osd2 software]# rbd info myrbd/hello.txt
rbd image 'hello.txt':
	size 12 bytes in 1 objects
	order 22 (4096 kB objects)
	block_name_prefix: rb.0.1365.6b8b4567
	format: 1
[root@osd2 software]# rados ls -p myrbd
rbd_data.13446b8b4567.00000000000000ba
rbd_directory
rbd_data.13446b8b4567.000000000000007d
rbd_data.13446b8b4567.000000000000007c
rbd_data.13446b8b4567.000000000000005d
rbd_data.13446b8b4567.000000000000007e
rbd_data.13446b8b4567.00000000000000ff
rb.0.1365.6b8b4567.000000000000
hello.txt.rbd
rbd_data.13446b8b4567.00000000000000d9
rbd_data.13446b8b4567.00000000000000f8
rbd_data.13446b8b4567.000000000000009b
rbd_data.13446b8b4567.0000000000000001
rbd_header.13446b8b4567
epel.rpm
rbd_data.13446b8b4567.000000000000001f
rbd_data.13446b8b4567.000000000000003e
rbd_id.rbd1
rbd_data.13446b8b4567.0000000000000000

#这样得到的位置信息是错误的
[root@osd2 software]# ceph osd map myrbd hello.txt
osdmap e88 pool 'myrbd' (4) object 'hello.txt' -> pg 4.d92fd82b (4.2b) -> up ([4,3], p4) acting ([4,3], p4)

#需要加上.rbd
[root@osd2 current]# ceph osd map myrbd hello.txt.rbd
osdmap e88 pool 'myrbd' (4) object 'hello.txt.rbd' -> pg 4.9b9bf373 (4.73) -> up ([3,1], p3) acting ([3,1], p3)
[root@osd2 current]# ssh osd1
[root@osd1 ~]# cd /cephmp2/current/4.73_head/
[root@osd1 4.73_head]# ll -h
total 8.0K
-rw-r--r-- 1 root root 112 Nov  4 18:08 hello.txt.rbd__head_9B9BF373__4
[root@osd1 4.73_head]# cat hello.txt.rbd__head_9B9BF373__4 
<<< Rados Block Device Image >>>
rb.0.1365.6b8b4567RBD001.005

#如果是普通的rbd块,format-1类型的rbd块:
#ceph osd map test test.img.rbd
#format-2类型的rbd块:
#ceph osd map test rbd_id.test.img

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