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nsenter

nsenter 命令是一个可以在指定进程的命令空间下运行指定程序的命令。
详见

网桥工具 bridge-utils

安装方式

Centos系统

yum install bridge-utils

Ubuntu系统

apt-get  install bridge-utils

使用方式

Usage: brctl [commands]
commands:
        addbr           <bridge>                add bridge
        delbr           <bridge>                delete bridge
        addif           <bridge> <device>       add interface to bridge
        delif           <bridge> <device>       delete interface from bridge
        hairpin         <bridge> <port> {on|off}        turn hairpin on/off
        setageing       <bridge> <time>         set ageing time
        setbridgeprio   <bridge> <prio>         set bridge priority
        setfd           <bridge> <time>         set bridge forward delay
        sethello        <bridge> <time>         set hello time
        setmaxage       <bridge> <time>         set max message age
        setpathcost     <bridge> <port> <cost>  set path cost
        setportprio     <bridge> <port> <prio>  set port priority
        show            [ <bridge> ]            show a list of bridges
        showmacs        <bridge>                show a list of mac addrs
        showstp         <bridge>                show bridge stp info
        stp             <bridge> {on|off}       turn stp on/off

进程管理

pstree 进程树

使用方法

pstree --help
pstree: unrecognized option '--help'
Usage: pstree [-acglpsStTuZ] [ -h | -H PID ] [ -n | -N type ]
              [ -A | -G | -U ] [ PID | USER ]
   or: pstree -V

Display a tree of processes.

  -a, --arguments     show command line arguments
		      显示命令行参数
  -A, --ascii         use ASCII line drawing characters
		      使用 ASCII 划线字符
  -c, --compact-not   don't compact identical subtrees
		      不要压缩相同的子树
  -C, --color=TYPE    color process by attribute                     (age)
		      根据属性进行颜色处理（例如：age）
  -g, --show-pgids    show process group ids; implies -c
		      显示进程组id;也意味着执行了 -c 
  -G, --vt100         use VT100 line drawing characters
                      使用VT100划线字符
  -h, --highlight-all highlight current process and its ancestors
		      突出显示当前进程及其祖先（会加粗）
  -H PID, --highlight-pid=PID
                      highlight this process and its ancestors
		      突出指定 PID 的进程极其祖先（会加粗）
  -l, --long          don't truncate long lines
		      不要截断长行
  -n, --numeric-sort  sort output by PID
		      通过 PID 对输出进行排序
  -N TYPE, --ns-sort=TYPE
                      sort output by this namespace type
                              (cgroup, ipc, mnt, net, pid, user, uts)
		      按此 namespace 类型对输出进行排序
  -p, --show-pids     show PIDs; implies -c
		      显示进程id;也意味着执行了 -c 
  -s [PID], --show-parents=PID  show parents of the selected process
                      显示所选进程的父进程
  -S, --ns-changes    show namespace transitions
		      显示 namespace 的转换
  -t, --thread-names  show full thread names
		      显示完整的线程名称
  -T, --hide-threads  hide threads, show only processes
		      隐藏线程，只显示进程
  -u, --uid-changes   show uid transitions
		      显示 uid 的转换
  -U, --unicode       use UTF-8 (Unicode) line drawing characters
                      使用UTF-8 (Unicode)划线字符
  -V, --version       display version information
		      显示版本信息
  -Z, --security-context
                      show SELinux security contexts
		      显示 SELinux 安全上下文
  PID    start at this PID; default is 1 (init)
	 起始进程 PID
  USER   show only trees rooted at processes of this user
         只显示这个用户的进程

实例

➜  ~ pstree -apnht
# 只展示了一部分内容：
 └─java,584183 -jar halo-1.4.16.jar
      ├─{java},584186
      ├─{GC Thread#0},584197
      ├─{G1 Main Marker},584198
      ├─{G1 Conc#0},584199
      ├─{G1 Refine#0},584200
      ├─{G1 Service},584201
      ├─{VM Thread},584202
      ├─{Reference Handl},584203
      ├─{Finalizer},584204
      ├─{Signal Dispatch},584205
      ├─{Service Thread},584206
      ├─{Monitor Deflati},584207
      ├─{C2 CompilerThre},584208
      ├─{C1 CompilerThre},584209
      ├─{Sweeper thread},584210
      ├─{Notification Th},584211
      ├─{VM Periodic Tas},584212
      ├─{Common-Cleaner},584213
      ├─{GC Thread#1},584214
      ├─{G1 Refine#1},584265
      ├─{qtp748006558-17},584267
      ├─{qtp748006558-19},584269
      ├─{qtp748006558-20},584270
      ├─{qtp748006558-21},584271
      ├─{qtp748006558-22},584272
      ├─{qtp748006558-23},584273
      ├─{Timer-0},584281
      ├─{mysql-cj-abando},584285
      ├─{MVStore backgro},584292
      ├─{HikariPool-1 ho},584293
      ├─{Session-HouseKe},584330
      ├─{HttpClient-1-Se},584366
      ├─{scheduling-1},584377
      ├─{Connector-Sched},584472
      ├─{Session-Schedul},584483
      ├─{qtp748006558-40},586105
      ├─{JGit-WorkQueue},586440
      ├─{pool-2-thread-1},587582
      ├─{pool-3-thread-1},587584
      ├─{logback-1},596772
      ├─{logback-2},596773
      ├─{qtp748006558-51},597095
      ├─{logback-3},614204
      ├─{logback-4},614205
      ├─{logback-5},625030
      ├─{logback-6},625031
      ├─{logback-7},634143
      ├─{logback-8},634144
      ├─{Java2D Disposer},672583
      └─{pool-3-thread-2},672832