title: Sysdig 项目
date: 2021-01-26 19:17:46
tags: Linux
sysdig相当于strace + tcpdump + lsof + htop + iftop 以及其他工具的合集 ，除此之外其还能对容器如docker、coreOS、LXC进行监控，收集了一些用法，具体可以参考这里
工作原理
sysdig 通过在内核的 driver 模块注册系统调用的 hook，这样当有系统调用发生和完成的时候，它会把系统调用信息拷贝到特定的 buffer，然后用户模块的组件对数据信息处理（解压、解析、过滤等），并最终通过 sysdig 命令行和用户进行交互。如下图所示：
常用命令
网络
查看占用网络带宽最多的进程：sysdig -c topprocs_net
显示主机192.168.0.1的网络传输数据：
sysdig -s2000 -X -c echo_fds fd.cip=192.168.0.1
这里显示网络传输功能，实际效果和tcpdump抓包是一样的。而且其本身也支持sysdig -w dump.scap抓包保存（可以配置-X或-A使用），抓好包也支持sysdir -r dump.scap读取。
查看连接最多的服务器端口：
in terms of established connections:
sysdig -c fdcount_by fd.sport “evt.type=accept”
in terms of total bytes:
sysdig -c fdbytes_by fd.sport
查看客户端连接最多的ip：
in terms of established connections
sysdig -c fdcount_by fd.cip “evt.type=accept”
in terms of total bytes
sysdig -c fdbytes_by fd.cip
列出所有不是访问apache服务的访问连接：
sysdig -p”%proc.name %fd.name” “evt.type=accept and proc.name!=httpd”
硬盘 I/O
查看使用硬盘带宽最多的进程：
sysdig -c topprocs_file
列出使用大量文件描述符的进程
sysdig -c fdcount_by proc.name “fd.type=file”
See the top files in terms of read+write bytes
sysdig -c topfiles_bytes
Print the top files that apache has been reading from or writing to
sysdig -c topfiles_bytes proc.name=httpd
Basic opensnoop: snoop file opens as they occur
sysdig -p “%12user.name %6proc.pid %12proc.name %3fd.num %fd.typechar %fd.name” evt.type=open
See the top directories in terms of R+W disk activity
sysdig -c fdbytes_by fd.directory “fd.type=file”
See the top files in terms of R+W disk activity in the /tmp directory
sysdig -c fdbytes_by fd.filename “fd.directory=/tmp/“
Observe the I/O activity on all the files named ‘passwd’
sysdig -A -c echo_fds “fd.filename=passwd”
Display I/O activity by FD type
sysdig -c fdbytes_by fd.type
进程和CPU使用率
See the top processes in terms of CPU usage
sysdig -c topprocs_cpu
See the top processes for CPU 0
sysdig -c topprocs_cpu evt.cpu=0
Observe the standard output of a process
sysdig -s4096 -A -c stdout proc.name=cat
4、应用
查看机器所有的HTTP请求
sudo sysdig -s 2000 -A -c echo_fds fd.port=80 and evt.buffer contains GET
查看机器所有的SQL select查询
sudo sysdig -s 2000 -A -c echo_fds evt.buffer contains SELECT
See queries made via apache to an external MySQL server happening in real time
sysdig -s 2000 -A -c echo_fds fd.sip=192.168.30.5 and proc.name=apache2 and evt.buffer contains SELECT性能和错误
See the files where most time has been spent
sysdig -c topfiles_time
See the files where apache spent most time
sysdig -c topfiles_time proc.name=httpd
See the top processes in terms of I/O errors
sysdig -c topprocs_errors
See the top files in terms of I/O errors
sysdig -c topfiles_errors
See all the failed disk I/O calls
sysdig fd.type=file and evt.failed=true
See all the failed file opens by httpd
sysdig “proc.name=httpd and evt.type=open and evt.failed=true”
See the system calls where most time has been spent
sysdig -c topscalls_time
See the top system calls returning errors
sysdig -c topscalls “evt.failed=true”
snoop failed file opens as they occur
sysdig -p “%12user.name %6proc.pid %12proc.name %3fd.num %fd.typechar %fd.name” evt.type=open and evt.failed=true
Print the file I/O calls that have a latency greater than 1ms:
sysdig -c fileslower 1
安全
Show the directories that the user “root” visits
sysdig -p”%evt.arg.path” “evt.type=chdir and user.name=root”
Observe ssh activity
sysdig -A -c echo_fds fd.name=/dev/pretmx and proc.name=sshd
Show every file open that happens in /etc
sysdig evt.type=open and fd.name contains /etc
Show the ID of all the login shells that have launched the “tar” command
sysdig -r file.scap -c list_login_shells tar
Show all the commands executed by the login shell with the given ID
sysdig -r trace.scap.gz -c spy_users proc.loginshellid=5459
容器
查看机器上运行的容器列表及其资源使用情况
sudo csysdig -vcontainers
查看容器上下文的进程列表
sudo csysdig -pc
查看运行在wordpress1容器里CPU的使用率
sudo sysdig -pc -c topprocs_cpu container.name=wordpress1
查看运行在wordpress1容器里网络带宽的使用率
sudo sysdig -pc -c topprocs_net container.name=wordpress1
查看在wordpress1容器里使用网络带宽最多的进程
sudo sysdig -pc -c topprocs_net container.name=wordpress1
查看在wordpress1 容器里占用 I/O 字节最多的文件
sudo sysdig -pc -c topfiles_bytes container.name=wordpress1
查看在wordpress1 容器里网络连接的排名情况
sudo sysdig -pc -c topconns container.name=wordpress1
显示wordpress1容器里所有命令执行的情况
sudo sysdig -pc -c spy_users container.name=wordpress1