如何在Alpine中使用ps命令获取特定PID的进程名称 [英] How can I get process name of specific PID with ps command in alpine

问题描述

在基于ubuntu的docker/os中

In ubuntu based docker/os

$ ps 
PID   USER     TIME   COMMAND
    1 postgres   0:00 postgres
   47 postgres   0:00 postgres: checkpointer process   
   48 postgres   0:00 postgres: writer process   
   49 postgres   0:00 postgres: wal writer process   
   50 postgres   0:00 postgres: autovacuum launcher process   
   51 postgres   0:00 postgres: stats collector process   
   52 postgres   0:00 postgres: bgworker: logical replication launcher

现在，如果运行ps -p 1 -o user=，它将为我 PID 1 处理USER postgres

Now If run ps -p 1 -o user=, it will get me PID 1 process USER postgres

$ ps -p 1 -o user=
postgres

这是我在基于ubuntu的图像/操作系统中可以做的

This is what I can do in ubuntu based image/os

现在

我真的在寻找一种方法来对基于alpine的图像执行相同的操作.在哪里可以运行ps命令来获取 PID 1 进程USER.

I am really seeking for a way to do the same for alpine based image. Where I can run ps command to get PID 1 process USER.

我没有找到任何文档/提示.

I didn't find any docs/hints around.

推荐答案

默认情况下，高山图像中的ps版本非常删减.这是一个繁忙的信箱:

There is very cut version of ps in alpine image by default. It is busybox one:

/ # ps --help
BusyBox v1.27.2 (2017-12-12 10:41:50 GMT) multi-call binary.

Usage: ps [-o COL1,COL2=HEADER]

Show list of processes

    -o COL1,COL2=HEADER Select columns for display

它只能显示带有已定义列的输出.

It can only show output with defined columns.

如果要使用未剪切的ps，则需要先将其安装到高山图像上:

If you want use uncut ps, you need to install it first to alpine image:

/ # apk add --no-cache procps
fetch http://dl-cdn.alpinelinux.org/alpine/v3.7/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.7/community/x86_64/APKINDEX.tar.gz
(1/6) Installing libintl (0.19.8.1-r1)
(2/6) Installing ncurses-terminfo-base (6.0_p20171125-r0)
(3/6) Installing ncurses-terminfo (6.0_p20171125-r0)
(4/6) Installing ncurses-libs (6.0_p20171125-r0)
(5/6) Installing libproc (3.3.12-r3)
(6/6) Installing procps (3.3.12-r3)
Executing busybox-1.27.2-r7.trigger
OK: 13 MiB in 17 packages

现在，您可以使用它了:

Now, you can use it you want:

/ # ps -p 1 -o user=
root

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