Docker退出容器不關閉容器的方法

進入docker容器后如果退出容器,容器就會變成Exited的狀態(tài),那么如何退出容器讓容器不關閉呢?
如果要正常退出不關閉容器,請按Ctrl+P+Q進行退出容器,這一點很重要,請牢記!

以下示例為退出容器但不關閉容器

[root@localhost ~]# docker attach c600c4519fc8
[root@c600c4519fc8 /]# exit
exit
[root@localhost ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                    PORTS               NAMES
c600c4519fc8        centos              "/bin/bash"         3 hours ago         Exited (0) 1 second ago                       pensive_jackson
5a7a0d694651        busybox             "sh"                20 hours ago        Exited (0) 20 hours ago                       hungry_vaughan
4b0296d18849        hello-world         "/hello"            46 hours ago        Exited (0) 46 hours ago                       hopeful_yonath
[root@localhost ~]# docker start pensive_jackson
pensive_jackson
[root@localhost ~]# docker attach c600c4519fc8

Ctrl + P + Q 

[root@c600c4519fc8 /]# read escape sequence
[root@localhost ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                    PORTS               NAMES
c600c4519fc8        centos              "/bin/bash"         3 hours ago         Up 22 seconds                                 pensive_jackson
5a7a0d694651        busybox             "sh"                20 hours ago        Exited (0) 20 hours ago                       hungry_vaughan
4b0296d18849        hello-world         "/hello"            46 hours ago        Exited (0) 46 hours ago                       hopeful_yonath

事實上我們可以在啟動容器的時候就進行配置,加入-d參數來啟動容器,當然,這條命令僅限于啟動全新的容器,啟動關閉的容器是不可以的。

Tips 1
docker run -d: 后臺運行容器,并返回容器ID

以下示例為使用docker -d啟動容器并退出

[root@localhost ~]# docker run -i -t -d centos /bin/bash
8521b11d5d99535d4cb0080adc5a58a4dd018ecd0751d9945f7da7ab01bec330
[root@localhost ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                      PORTS               NAMES
8521b11d5d99        centos              "/bin/bash"         4 seconds ago       Up 4 seconds                                    eager_goldwasser
c600c4519fc8        centos              "/bin/bash"         3 hours ago         Exited (0) 28 seconds ago                       pensive_jackson
5a7a0d694651        busybox             "sh"                20 hours ago        Exited (0) 20 hours ago                         hungry_vaughan
4b0296d18849        hello-world         "/hello"            46 hours ago        Exited (0) 46 hours ago                         hopeful_yonath
[root@localhost ~]# docker attach 8
[root@8521b11d5d99 /]# uname -r
3.10.0-514.el7.x86_64
[root@8521b11d5d99 /]# exit
exit
[root@localhost ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                     PORTS               NAMES
8521b11d5d99        centos              "/bin/bash"         2 minutes ago       Exited (0) 2 seconds ago                       eager_goldwasser
c600c4519fc8        centos              "/bin/bash"         3 hours ago         Exited (0) 2 minutes ago                       pensive_jackson
5a7a0d694651        busybox             "sh"                20 hours ago        Exited (0) 20 hours ago                        hungry_vaughan
4b0296d18849        hello-world         "/hello"            46 hours ago        Exited (0) 46 hours ago                        hopeful_yonath

在這里你可能會發(fā)現(xiàn),使用了-d的命令退出后容器依然還是死了,動手型的朋友可能會發(fā)現(xiàn)只是用docker run -d去啟動容器也一樣是死的
這里其實需要了解的是容器的運行機制,Docker容器在后臺運行,必須要有一個前臺進程,這里我們讓容器有前臺程序運行,就可以實現(xiàn)容器的-d 啟動后存活

[root@localhost ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                     PORTS               NAMES
c600c4519fc8        centos              "/bin/bash"         3 hours ago         Exited (0) 4 minutes ago                       pensive_jackson
5a7a0d694651        busybox             "sh"                21 hours ago        Exited (0) 21 hours ago                        hungry_vaughan
4b0296d18849        hello-world         "/hello"            47 hours ago        Exited (0) 47 hours ago                        hopeful_yonath
[root@localhost ~]# docker run -d centos /bin/bash -c "nohup ping -i 1000 www.baidu.com"
8aa19c9604382bc019797ccda831ae1bcebd81d86380b6040d636e03000b440a
[root@localhost ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                     PORTS               NAMES
8aa19c960438        centos              "/bin/bash -c 'nohup…"   2 seconds ago       Up 2 seconds                                   adoring_wing
c600c4519fc8        centos              "/bin/bash"              3 hours ago         Exited (0) 5 minutes ago                       pensive_jackson
5a7a0d694651        busybox             "sh"                     21 hours ago        Exited (0) 21 hours ago                        hungry_vaughan
4b0296d18849        hello-world         "/hello"                 47 hours ago        Exited (0) 47 hours ago                        hopeful_yonath

我這里使用nohup在后臺運行一個每1000秒ping一次百度的進程,另外你也可以使用"while true; do echo hello world; sleep 1; done",無限輸出hello world。

另外即便是有進程在后臺運行,你進入了容器,輸入exit退出,依然會終止容器的運行,請謹記。

Ctrl+P+Q依然是我認為的最佳用法。
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