超级系统工具Sysdig，比 strace、tcpdump、lsof 加起来还强大

可以用sysdig命令做很多很酷的事情

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 as binary: sysdig -s2000 -X -c echo_fds fd.cip=192.168.0.1 as ASCII: sysdig -s2000 -A -c echo_fds fd.cip=192.168.0.1
• 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"

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

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

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

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/ptmx 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

原文链接：http://www.sysdig.org/wiki/sysdig-examples/ 网摘文章，如有不妥，请联系我们！