CentOS 5.8 上安装 systemtap-2.6

最近为了分析公司的一个 nginx + lua 的应用性能，正好需要用到春神的那套 nginx-lua 的分析脚本，因此就立马去搭建下

环境：

• CentOS 5.8
• Lua 5.2.3
• luajit-2.0.3
• systemtap-2.6
• nginx

依赖项：

• systemtap-2.6 依赖于 elfutils

注：CentOS 5.8 上面安装 systemtap-2.6 的时候，elfutils 的版本不能太高，不然会报错，安装 systemtap-2.6 失败，目前使用的版本是 elfutils-0.149

该文的前提是你已经编译安装好了支持 lua 的 nginx 版本，以及你已经安装好了 systemstap 所需的你对应操作系统的 kernel-debug-debuginfo 和 kernel-debuginfo-common，这个版本必须和你的系统的内核版本一模一样，一个字符不一样都不行，查看版本的方法是：

[apps@TEST-APP-011 ~]$ uname -r 2.6.18-308.el5 

所以我对应的版本是：

kernel-debug-debuginfo-2.6.18-308.el5.x86_64.rpm kernel-debuginfo-common-2.6.18-308.el5.x86_64.rpm 

具体的安装步骤可以参考官方文档。

下载安装所需的软件

下载 systemtap-2.6

cd /tmp/ && wget https://sourceware.org/systemtap/ftp/releases/systemtap-2.6.tar.gz --no-check-certificate 

下载 elfutils-0.149

cd /tmp && wget https://fedorahosted.org/releases/e/l/elfutils/0.149/elfutils-0.149.tar.bz2 --no-check-certificate 

安装 systemtap-2.6

1. 解压 elfutils-0.149

   cd /tmp/ && tar -xvf elfutils-0.149.tar.bz2 

2. 解压 systemtap-2.6

   cd /tmp && tar -zxvf systemtap-2.6.tar.gz 

3. 安装 systemtap-2.6

   编译

   cd /tmp/systemtap-2.6 && ./configure --prefix=/opt/stap --disable-docs --disable-publican --disable-refdocs CFLAGS="-g -O2" --with-elfutils=/tmp/elfutils-0.149 

   安装

   make -j8 && make install 

4. 做软连接

   sudo ln -snf /opt/stap/bin/stap /usr/bin/stap 

5. 验证命令

   stap -V Systemtap translator/driver (version 2.6/0.149, non-git sources) Copyright (C) 2005-2014 Red Hat, Inc. and others This is free software; see the source for copying conditions. enabled features: LIBRPM LIBSQLITE3 NSS BOOST_SHARED_PTR TR1_UNORDERED_MAP NLS LIBXML2 

注：有时候运行 stap -V 命令的时候会出错，错误如下：

stap: /usr/lib64/libelf.so.1: version `ELFUTILS_1.5' not found (required by stap) stap: /usr/lib64/libdw.so.1: version `ELFUTILS_0.138' not found (required by stap) stap: /usr/lib64/libdw.so.1: version `ELFUTILS_0.142' not found (required by stap) stap: /usr/lib64/libdw.so.1: version `ELFUTILS_0.143' not found (required by stap) stap: /usr/lib64/libdw.so.1: version `ELFUTILS_0.149' not found (required by stap)

解决办法是，执行如下命令：

//查看 stap 的安装路径 [apps@TEST-APP-011 ~]$ eu-readelf -d /usr/bin/stap|grep -E "RPATH|RUNPATH"   RPATH             Library rpath: [/opt/stap/lib/systemtap]   RUNPATH           Library runpath: [/opt/stap/lib/systemtap] 

// 加入环境变量 export LD_LIBRARY_PATH=/opt/stap/lib/systemtap:$LD_LIBRARY_PATH 

使用春神的脚本

下载脚本：

git clone https://github.com/openresty/nginx-systemtap-toolkit.git 

拿其中的一个脚本校验，结果如下：

sudo ./ngx-req-distr -c -m `cat /opt/nginx/sbin/nginx.pid` Tracing 5959 5960 5961 5962 5963 5964 5965 5966 5967 5968 5969 5970 5971 5972 5973 5974 5975 5976 5977 5978 5979 5980 5981 5982 5983 (/opt/nginx-lua/sbin/nginx)... worker 5959:    0 reqs, 0 conns worker 5960:    0 reqs, 0 conns worker 5961:    0 reqs, 0 conns worker 5962:    0 reqs, 0 conns worker 5963:    0 reqs, 0 conns worker 5964:    0 reqs, 0 conns worker 5965:    0 reqs, 0 conns worker 5966:    0 reqs, 0 conns worker 5967:    0 reqs, 0 conns worker 5968:    0 reqs, 0 conns worker 5969:    0 reqs, 0 conns worker 5970:    387290 reqs,    15 conns worker 5971:    610857 reqs,    106 conns worker 5972:    0 reqs, 0 conns worker 5973:    0 reqs, 0 conns worker 5974:    21 reqs,        74 conns worker 5975:    0 reqs, 0 conns worker 5976:    531284 reqs,    96 conns worker 5977:    571358 reqs,    213 conns worker 5978:    560546 reqs,    165 conns worker 5979:    629476 reqs,    14297 conns worker 5980:    575010 reqs,    247 conns worker 5981:    650624 reqs,    622 conns worker 5982:    499562 reqs,    249 conns worker 5983:    0 reqs, 0 conns 

软件来源地址

• https://fedorahosted.org/releases/e/l/elfutils/0.149/
• https://github.com/openresty/nginx-systemtap-toolkit#sample-bt
• http://debuginfo.centos.org/5/x86_64/

参考阅读

• https://github.com/openresty/nginx-systemtap-toolkit#sample-bt
• http://m.blog.csdn.net/blog/hubaolin/18146413

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