递归while循环在docker cmd中 [英] Recursive while loop in docker cmd

问题描述

我试图在docker容器中运行google chrome。我已经能够成功地这样做，但有一些情况下，chrome不会运行在一些容器（大量创建容器）。

I'm trying to run google chrome inside docker containers. I have been able to successfully do so, however there have been instances where chrome would not run on some of the containers (mass creation of containers).

所以我希望运行一个while循环，直到chrome进程被发现运行。我尝试了以下操作但出现错误，例如bash：[if：command not found]

So I'm looking to run a while loop till the chrome process is found to be running. I've tried the following but with errors like "bash: [if: command not found"

    var chrome_command = 'google-chrome --user-data-dir=/home/ubuntu/chrome-user-dir';

    var cmd = '';
    cmd += 'Xvfb :99 & ';
    cmd += 'export DISPLAY=:99 & ';
    cmd += 'x11vnc -rfbport 6001 -display :99 -bg -q & ';
    cmd += 'while [if ps aux | grep "google-chrome"|grep -v grep > /dev/null]; do ' + chrome_command + '; sleep 1 ; done';

有人能指出我的错误！谢谢！

Could someone point out where I am going wrong! Thanks!

推荐答案

最后一行应为：

    cmd += 'while ! ps aux | grep -v grep | grep -q chrome; do ' + chrome_command + '; sleep 1 ; done';

• -q grep 就足以看出输入中是否有匹配的行。


• 使用！来否定命令列表的结果。


• 似乎 google-chrome code> ps aux 。


• -q for the last grep would suffice to see if there's matched lines in the input.
• Use ! to negate the result of list of commands.
• It seems google-chrome won't appears in ps aux.

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