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<>问题描述:
centos 启动一个容器添加了-d 参数,但是docker ps 或者docker ps -a查看却已经退出了
shell>docker run -d centos
a44b2b88559b68a2221c9574490a0e708bff49d88ca21f9e59d3eb245c7c0547 shell>docker ps
<>退出原因
1、docker容器运行必须有一个前台进程, 如果没有前台进程执行,容器认为空闲,就会自行退出
2、容器运行的命令如果不是那些一直挂起的命令( 运行top,tail、循环等),就是会自动退出
3、这个是 docker 的机制问题
<>解决方案
方案1:
网上有很多介绍,就是起一个死循环进程,让他不停的循环下去,前台永远有进程执行,那么容器就不会退出了,以centos为例
shell>docker run -d centos /bin/sh -c "while true; do echo hello world; sleep
1; done"
缺点: 命令太冗长了,还占用一个终端
方案2:
shell>docker run -dit centos /bin/bash
添加-it 参数交互运行
添加-d 参数后台运行
这样就能启动一个一直停留在后台运行的Centos了。
shell>docker ps 容器运行起来了
<>进入容器的方法:
使用exec,不要使用attach命令
attach命令就是使用现有终端,如果你要退出容器操作,那么bash结束,容器也就退出了
shell>docker exec -it /bin/bash //新建一个bash