docker commit失败,"没有这样的id"

Question

通过docker教程学习如何在mac上使用docker:https: //docs.docker.com/userguide/dockerimages/

尝试更新并提交图像.
收到我不理解的错误消息.

$docker pull training/sinatra
Pulling repository training/sinatra
...
79e6bf39f993: Download complete 
Status: Downloaded newer image for training/sinatra:latest

$docker run -t -i training/sinatra /bin/bash

root@6a2012d33405:/# gem install json
Fetching: json-1.8.2.gem (100%)
Building native extensions.  This could take a while...    
Successfully installed json-1.8.2
1 gem installed
Installing ri documentation for json-1.8.2...
Installing RDoc documentation for json-1.8.2...

root@6a2012d33405:/# exit
exit

$docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
...
hello-world         latest              91c95931e552        6 weeks ago         910 B
training/sinatra    latest              f0f4ab557f95        11 months ago       447 MB

$docker commit -m "Added json gem" -a "Yours Truly" f0f4ab557f95 ouruser/sinatra:v2
FATA[0000] Error response from daemon: no such id: f0f4ab557f95 

Answer 1

看起来我使用的是错误的ID.
"IMAGE ID"与"容器ID"不同.
后者是在提示符"root @ 6a2012d33405"中出现在"root @"之后的内容.
这有效:

$docker commit -m "Added json gem" -a "Yours Truly" 6a2012d33405  ouruser/sinatra:v2
36c544150c9405934674b52ffc447519cb428c0526607276daab56025dfd6b11

$docker images
REPOSITORY          TAG                 IMAGE ID            CREATED              VIRTUAL SIZE
ouruser/sinatra     v2                  36c544150c94        About a minute ago   452.1 MB
...
hello-world         latest              91c95931e552        6 weeks ago          910 B
training/sinatra    latest              f0f4ab557f95        11 months ago        447 MB