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ceph-dencoder基本使用.html
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ceph-dencoder基本使用
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<a href="/ceph-dencoder基本使用.html" class="archive-article-date">
<time datetime="2018-03-27T14:06:41.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-03-27</time>
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<p>本文摘自<a href="https://blog.csdn.net/scaleqiao/article/details/51987426" target="_blank" rel="noopener">https://blog.csdn.net/scaleqiao/article/details/51987426</a></p>
<p>0 简介</p>
<p>贯穿Ceph OSD端数据处理的一个核心结构就是ObjectStore::Transaction,OSD处理的所有操作以及其关联的数据都会封装进入Transaction中的bufferlist结构里,这里的封装也就是序列化(encode),它将各种数据结构无论简单或者复杂都作为字节流,存入bufferlist中。最终Transaction会由具体的ObjectStore后端实现来处理,当然,处理时会对bufferlist中的数据进行反序列化(decode)。而本文介绍的ceph-dencoder工具就是Ceph提供的可以进行encode、decode以及dump ceph相关数据结构的工具,同时它也可以用来调试以及测试Ceph不同版本之间的兼容性。今天这里主要介绍它的decode功能,其他功能大家可以自行研究。<br><a id="more"></a><br><strong>1 安装</strong></p>
<p>ceph-dencoder工具是默认安装的。</p>
<p><strong>2 使用</strong></p>
<p>可以通过它的manpage或者help文档来了解它的使用</p>
<pre><code>[root@ceph03 ~]# man ceph-dencoder
[root@ceph03 ~]# ceph-dencoder -h
usage: ceph-dencoder [commands ...]
version print version string (to stdout)
import <encfile> read encoded data from encfile
export <outfile> write encoded data to outfile
set_features <num> set feature bits used for encoding
get_features print feature bits (int) to stdout
list_types list supported types
type <classname> select in-memory type
skip <num> skip <num> leading bytes before decoding
decode decode into in-memory object
encode encode in-memory object
dump_json dump in-memory object as json (to stdout)
copy copy object (via operator=)
copy_ctor copy object (via copy ctor)
count_tests print number of generated test objects (to stdout)
select_test <n> select generated test object as in-memory object
is_deterministic exit w/ success if type encodes deterministically
</code></pre><p>它的用法比较简单,即ceph-dencoder跟上相应的子命令即可。<br>在具体使用时,可以通过以下命令查看ceph-dencoder当前支持哪些结构:</p>
<pre><code>ceph-dencoder list_types
</code></pre><p>要确定需要通过哪种结构来进行数据解析,只能通过阅读源码,找到encode数据时,数据对应的数据结构。</p>
<p><strong>3 使用事例</strong></p>
<p>下面以查看object的object_info信息为例,介绍一下这个工具的使用。</p>
<p>在使用XFS作为后端存储时,一个object就对应一个文件,obejct的object_info信息通常是作为文件的扩展属性存在的。</p>
<p>首先先找到一个object对应的文件,并查看object文件的扩展属性,这里会用到XFS一个工具attr,主要用于操作XFS文件的扩展属性的:</p>
<pre><code>[root@ceph02 0.10_head]# rados ls -p rbd
rbd_header.d3652ae8944a
rbd_directory
rbd_id.test
</code></pre><p>查看ceph osd map rbd rbd_header.d3652ae8944a 找到对应的osd</p>
<pre><code>[root@ceph02 0.10_head]#
[root@ceph02 0.10_head]# attr -l rbd\\uheader.d3652ae8944a__head_9EB01B90__0
Attribute "cephos.spill_out" has a 2 byte value for rbd\uheader.d3652ae8944a__head_9EB01B90__0
Attribute "ceph._lock.rbd_lock" has a 23 byte value for rbd\uheader.d3652ae8944a__head_9EB01B90__0
Attribute "ceph._" has a 250 byte value for rbd\uheader.d3652ae8944a__head_9EB01B90__0
Attribute "ceph._@1" has a 250 byte value for rbd\uheader.d3652ae8944a__head_9EB01B90__0
Attribute "ceph._@2" has a 92 byte value for rbd\uheader.d3652ae8944a__head_9EB01B90__0
Attribute "ceph.snapset" has a 31 byte value for rbd\uheader.d3652ae8944a__head_9EB01B90__0
</code></pre><p>从上面的输出可以看到扩展属性中总共有3部分,其中”ceph.<em>“和”ceph.</em>@1”,”ceph.<em>@2”应该算是一部分,因为ceph.</em>超出了XFS扩展属性的长度限制,所以拆成了3个。而它里面就存放了我们要找的object_info_t的数据。”cephos.spill_out”是一个两个字节的字符数组,用于记录文件的扩展属性是否溢出到了Omap里,一般它的值是“0”或者“1”,“0”就是源码里的宏定义XATTR_NO_SPILL_OUT,表示没有溢出,而“1”是XATTR_SPILL_OUT,表示有溢出。“ceph.snapset”用来记录和Object相关的Snapshot信息,它的数据以SnapSet这个结构的形式存在。</p>
<p>另外还有一个通用的命令getfattr也可以干类似的事情。</p>
<pre><code>[root@ceph02 0.10_head]# getfattr -d rbd\\uheader.d3652ae8944a__head_9EB01B90__0 -m 'user\.ceph\._'
# file: rbd\134uheader.d3652ae8944a__head_9EB01B90__0
user.ceph._=0sDwhKAgAABAM4AAAAAAAAABcAAAByYmRfaGVhZGVyLmQzNjUyYWU4OTQ0Yf7/////////kBuwngAAAAAAAAAAAAAAAAAGAxwAAAAAAAAAAAAAAP////8AAAAAAAAAAP//////////AAAAAAoAAAAAAAAAOAAAAAkAAAAAAAAAOAAAAAICFQAAAAhr0wAAAAAAAAIAAAAAAAAAAQAAAAAAAAAAAAAAIki6WizsNiECAhUAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEAAAAIa9MAAAAAAAAEA5QAAAABAAAAAAAAAB4AAAAAAA==
user.ceph._@1=0sAADTQ2beAAIAAMCoAakAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIAAAAAAAAAAAAAAAAAQAAAAEAAAAAAAAACGvTAAAAAAAABAOUAAAAAQAAAAAAAAAeAAAAAAAAANNDZt4AAgAAwKgBqQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==
user.ceph._@2=0sAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHAAAACJIulr/91Ah//////////8=
user.ceph._lock.rbd_lock=0sAQERAAAAAAAAAAEIAAAAaW50ZXJuYWw=
</code></pre><p>接着,我们将扩展属性中的数据dump到一个文件当中,注意应该将”ceph.<em>“和”ceph.</em>@1”,”ceph._@1”的数据拼起来。</p>
<pre><code>[root@ceph02 0.10_head]# attr -q -g "ceph._" rbd\\uheader.d3652ae8944a__head_9EB01B90__0 > 1.txt
[root@ceph02 0.10_head]# attr -q -g "ceph._@1" rbd\\uheader.d3652ae8944a__head_9EB01B90__0 >> 1.txt
[root@ceph02 0.10_head]# attr -q -g "ceph._@2" rbd\\uheader.d3652ae8944a__head_9EB01B90__0 >> 1.txt
</code></pre><p>最后使用ceph-dencoder工具将其内容解析出来。</p>
<pre><code>[root@ceph02 0.10_head]# ceph-dencoder import 1.txt type object_info_t decode dump_json
{
"oid": {
"oid": "rbd_header.d3652ae8944a",
"key": "",
"snapid": -2,
"hash": 2662341520,
"max": 0,
"pool": 0,
"namespace": ""
},
"version": "56'10",
"prior_version": "56'9",
"last_reqid": "client.54123.1:2",
"user_version": 8,
"size": 0,
"mtime": "2018-03-27 21:33:22.557247",
"local_mtime": "2018-03-27 21:33:22.558954",
"lost": 0,
"flags": 28,
"snaps": [],
"truncate_seq": 0,
"truncate_size": 0,
"data_digest": 4294967295,
"omap_digest": 4294967295,
"watchers": {
"client.54123": {
"cookie": 1,
"timeout_seconds": 30,
"addr": {
"nonce": 3731243987,
"addr": "192.168.1.169:0"
}
}
}
}
</code></pre><p>后期遇到详细学习。仅做记录。</p>
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