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systemtap-centos7上安装调试.html
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systemtap-centos7上安装调试
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<a href="/systemtap-centos7上安装调试.html" class="archive-article-date">
<time datetime="2018-05-11T02:04:36.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-05-11</time>
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<p><strong>systemtap简介</strong></p>
<p>SystemTap 是一款诊断Linux系统性能的工具，可以跟踪内核以及用户态程序中的任意函数、syscall、语句甚至指令，可以用来动态地收集调试和性能信息的工具，不需要我们重新编译、重启内核。</p>
<p>详细介绍查看官网地址。其官网地址 <a href="https://sourceware.org/systemtap/" title="https://sourceware.org/systemtap/" target="_blank" rel="noopener">https://sourceware.org/systemtap/</a>。<br><a id="more"></a><br><strong>systemtap安装</strong></p>
<p>本例环境 centos7 7.2.1511 内核版本3.10.0-693.21.1.el7.x86_64</p>
<p>systemtap包安装</p>
<pre><code>yum install systemtap systemtap-runtime
</code></pre><p>systemtap内核信息安装包安装</p>
<p>• kernel-debuginfo</p>
<p>• kernel-debuginfo-common</p>
<p>• kernel-devel</p>
<p>通过root用户执行如下命令进行以上3个包的自动安装</p>
<pre><code>stap-prep
</code></pre><p><strong>确认安装成功</strong></p>
<p>执行如下脚本，返回complete即可</p>
<pre><code>[root@node1 ~]# stap -v -e 'probe vfs.read {printf("read performed\n"); exit()}'
Pass 1: parsed user script and 466 library scripts using 226636virt/39688res/3308shr/36524data kb, in 190usr/130sys/323real ms.
Pass 2: analyzed script: 1 probe, 1 function, 7 embeds, 0 globals using 371188virt/179300res/4640shr/181076data kb, in 1270usr/690sys/1964real ms.
Pass 3: using cached /root/.systemtap/cache/df/stap_df47b68c3f1c63f931107c651e9afa76_2692.c
Pass 4: using cached /root/.systemtap/cache/df/stap_df47b68c3f1c63f931107c651e9afa76_2692.ko
Pass 5: starting run.
read performed
Pass 5: run completed in 0usr/50sys/448real ms.
[root@node1 ~]#
</code></pre><p><strong>其他机器上执行</strong></p>
<p>当用户允许一个systemtap 脚本的时候，它会将脚本build为一个内核模块，然后加载该模块，当有事件触发该模块的时候，则执行模块。但是systemtap 脚本只能在部署了debuginfo等内核信息包的主机运行，那么在其他没有安装这些debuginfo的主机如何运行systemtap脚本呢？</p>
<p>这里systemtap，命令stap支持指定参数-m 将脚本编译为一个内核模块，然后将该模块复制到其他没有安装debuginfo的节点。在其他节点上通过staprun module.ko执行脚本。</p>
<p>举例：</p>
<ul>
<li><p>node1 作为host system是安装了systemtap systemtap-runtime kernel-debuginfo等所有包的节点。</p>
</li>
<li><p>node3 作为target system 仅仅安装了systemtap-runtime包。</p>
</li>
<li><p>node1 和node3 内核尽量保持一致。不一致也没有关系，通过-r参数指定target system内核版本即可,但是前提是node1即host system节点必须也安装了target system节点的内核版本。</p>
</li>
</ul>
<p>查看内核信息以及将脚本编译输出到模块teststap</p>
<pre><code>[root@node1 ~]# uname -r
3.10.0-693.21.1.el7.x86_64
[root@node3 ~]# uname -r
3.10.0-693.21.1.el7.x86_64
[root@node1 ~]# stap -v -r 3.10.0-693.21.1.el7.x86_64 -e 'probe vfs.read {printf("read performed\n"); exit()}' -m teststap
1: parsed user script and 466 library scripts using 226648virt/39732res/3336shr/36536data kb, in 290usr/30sys/329real ms.
Pass 2: analyzed script: 1 probe, 1 function, 7 embeds, 0 globals using 371200virt/179340res/4660shr/181088data kb, in 1160usr/650sys/1810real ms.
Pass 3: translated to C into "/tmp/stap2XZAPY/teststap_src.c" using 371200virt/179588res/4908shr/181088data kb, in 20usr/70sys/81real ms.
Pass 4: compiled C into "teststap.ko" in 790usr/1380sys/2079real ms.
Pass 5: starting run.
read performed
Pass 5: run completed in 0usr/70sys/393real ms.
[root@node1 ~]# ll teststap.ko
-rw-r--r-- 1 root root 96912 May 10 16:29 teststap.ko
</code></pre><p>上面命令-r 指定内核版本，若是2者之间内核一致，则可以不需要-r参数。<br>将该模块文件复制到node3节点，然后执行如下确认：</p>
<pre><code>[root@node1 ~]# scp teststap.ko root@node3:/root
teststap.ko 100% 95KB 33.9MB/s 00:00
[root@node1 ~]# ssh node3
Last login: Thu May 10 14:36:32 2018 from 192.168.0.99
[root@node3 ~]# staprun teststap.ko
read performed
[root@node3 ~]#
</code></pre><p>成功执行模块指令</p>
<p><strong>运行systemtap 脚本</strong></p>
<p>常用命令stap staprun 相关使用使用man查看</p>
<p>运行stap命令用户最好拥有root权限，若是普通用户则需要将其加入到组stapdev 或者stapusr ，详情查看官网介绍。</p>
<p>脚本运行方式：</p>
<p>1、通过脚本文件</p>
<p>stap script_file_name</p>
<p>2、通过- 从标准输出中获取脚本信息</p>
<p>echo “probe timer.s(1) {exit()}” | stap -v -</p>
<p><strong>stap基本参数</strong></p>
<p>-v 详细列出输出信息-vvv列出更多信息</p>
<p>-o filename 将标准输出到指定文件名</p>
<p>-S size,count 限制output文件的数量和单个文件大小。</p>
<p>-x process_id 设置systemtap句柄函数target()获取指定进程ID的信息</p>
<p>-c command 设置systemtap句柄函数target()通过指定的command来运行</p>
<p>-e ‘scrip’ 使用脚本作为systemtap的输入</p>
<p>-F 让systemtap在后台已进程方式运行，默认后台模式有2种，一种是in-memory ，一种是file 模式</p>
<ul>
<li>in-memory 模式</li>
</ul>
<p>执行</p>
<pre><code>stap -F iotime.stp
</code></pre><p>执行改命令后，stap打印简单的改命令执行信息，方便你重新连接改脚本：</p>
<pre><code>Disconnecting from systemtap module.
To reconnect, type "staprun -A stap_5dd0073edcb1f13f7565d8c343063e68_19556"
</code></pre><p>获取结果</p>
<pre><code>staprun -A stap_5dd0073edcb1f13f7565d8c343063e68_19556
</code></pre><ul>
<li>file 模式</li>
</ul>
<p>执行</p>
<pre><code>stap -F -o /tmp/pfaults.log -S 1,2 pfaults.stp
</code></pre><p>生成2个文件，每个文件1M大小，文件格式如/tmp/iotime.log.[0-9]+<br>始终保持最新的数据到这2个文件中，旧数据会被remove。该命令执行后会输出进程id号，则通过kill 命令停止脚本运行，举例id号为7590</p>
<pre><code>kill -s SIGTERM 7590
</code></pre>
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pages: false
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path: true
text: false
raw: false
content: false
slug: false
updated: false
comments: false
link: false
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categories: false
tags: true
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