运行docker build .输出：
Sending build context to Docker daemon 2.048 kB
Step 1 : FROM ubuntu:14.04.3
14.04.3: Pulling from library/ubuntu
8387d9ff0016: Pull complete
3b52deaaf0ed: Pull complete
4bd501fad6de: Pull complete
a3ed95caeb02: Pull complete
Digest: sha256:2febbcede4f3eb82ae0dc44518a2e2a7b06a0452685e64e6b13f51b278294780
Status: Downloaded newer image for ubuntu:14.04.3
---> 3876b81b5a81
Step 2 : RUN sudo apt-get install git
---> Running in cda85e00be34
Reading package lists...
Building dependency tree...
Reading state information...
The following extra packages will be installed:
ca-certificates git-man krb5-locales libasn1-8-heimdal libcurl3-gnutls
libedit2 liberror-perl libgssapi-krb5-2 libgssapi3-heimdal
libhcrypto4-heimdal libheimbase1-heimdal libheimntlm0-heimdal
libhx509-5-heimdal libidn11 libk5crypto3 libkeyutils1 libkrb5-26-heimdal
libkrb5-3 libkrb5support0 libldap-2.4-2 libroken18-heimdal librtmp0
libsasl2-2 libsasl2-modules libsasl2-modules-db libwind0-heimdal libx11-6
libx11-data libxau6 libxcb1 libxdmcp6 libxext6 libxmuu1 openssh-client
openssl patch rsync xauth
Suggested packages:
gettext-base git-daemon-run git-daemon-sysvinit git-doc git-el git-email
git-gui gitk gitweb git-arch git-bzr git-cvs git-mediawiki git-svn krb5-doc
krb5-user libsasl2-modules-otp libsasl2-modules-ldap libsasl2-modules-sql
libsasl2-modules-gssapi-mit libsasl2-modules-gssapi-heimdal ssh-askpass
libpam-ssh keychain monkeysphere ed diffutils-doc openssh-server
Recommended packages:
ssh-client
The following NEW packages will be installed:
ca-certificates git git-man krb5-locales libasn1-8-heimdal libcurl3-gnutls
libedit2 liberror-perl libgssapi-krb5-2 libgssapi3-heimdal
libhcrypto4-heimdal libheimbase1-heimdal libheimntlm0-heimdal
libhx509-5-heimdal libidn11 libk5crypto3 libkeyutils1 libkrb5-26-heimdal
libkrb5-3 libkrb5support0 libldap-2.4-2 libroken18-heimdal librtmp0
libsasl2-2 libsasl2-modules libsasl2-modules-db libwind0-heimdal libx11-6
libx11-data libxau6 libxcb1 libxdmcp6 libxext6 libxmuu1 openssh-client
openssl patch rsync xauth
0 upgraded, 39 newly installed, 0 to remove and 0 not upgraded.
Need to get 7671 kB of archives.
After this operation, 41.2 MB of additional disk space will be used.
Do you want to continue? [Y/n] Abort.
The command '/bin/sh -c sudo apt-get install git' returned a non-zero code: 1
ssh user@ .com
MACLA910275:~ user$ ssh user@ .com
Unauthorized access to or use of this system is prohibited.
All access and use may be monitored and recorded.
user@ .com's password:
Welcome to Ubuntu 14.04.3 LTS (GNU/Linux 3.19.0-39-generic x86_64)
Unauthorized access to or use of this system is prohibited. All access and use may be monitored and recorded.
Unauthorized access to or use of this system is prohibited. All access and use may be monitored and recorded.
user@ :~$ ls
user@ :~$ pwd
/home/user
user@ :~$ sudo apt-get install git
Reading package lists... Done
Building dependency tree
Reading state information... Done
git is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 66 not upgraded.
user@ :~$ docker
Usage: docker [OPTIONS] COMMAND [arg...]
docker daemon [ --help | ... ]
docker [ --help | -v | --version ]
A self-sufficient runtime for containers.
Options:
--config=~/.docker Location of client config files
-D, --debug Enable debug mode
-H, --host=[] Daemon socket(s) to connect to
-h, --help Print usage
-l, --log-level=info Set the logging level
--tls Use TLS; implied by --tlsverify
--tlscacert=~/.docker/ca.pem Trust certs signed only by this CA
--tlscert=~/.docker/cert.pem Path to TLS certificate file
--tlskey=~/.docker/key.pem Path to TLS key file
--tlsverify Use TLS and verify the remote
-v, --version Print version information and quit
Commands:
attach Attach to a running container
build Build an image from a Dockerfile
commit Create a new image from a container's changes
cp Copy files/folders between a container and the local filesystem
create Create a new container
diff Inspect changes on a container's filesystem
events Get real time events from the server
exec Run a command in a running container
export Export a container's filesystem as a tar archive
history Show the history of an image
images List images
import Import the contents from a tarball to create a filesystem image
info Display system-wide information
inspect Return low-level information on a container or image
kill Kill a running container
load Load an image from a tar archive or STDIN
login Log in to a Docker registry
logout Log out from a Docker registry
logs Fetch the logs of a container
network Manage Docker networks
pause Pause all processes within a container
port List port mappings or a specific mapping for the CONTAINER
ps List containers
pull Pull an image or a repository from a registry
push Push an image or a repository to a registry
rename Rename a container
restart Restart a container
rm Remove one or more containers
rmi Remove one or more images
run Run a command in a new container
save Save one or more images to a tar archive
search Search the Docker Hub for images
start Start one or more stopped containers
stats Display a live stream of container(s) resource usage statistics
stop Stop a running container
tag Tag an image into a repository
top Display the running processes of a container
unpause Unpause all processes within a container
update Update configuration of one or more containers
version Show the Docker version information
volume Manage Docker volumes
wait Block until a container stops, then print its exit code
Run 'docker COMMAND --help' for more information on a command.
user@ :~$ sudo apt-get install g
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package g
user@ :~$
user@ :~$
user@ :~$
user@ :~$
user@ :~$
user@ :~$ docker images
Cannot connect to the Docker daemon. Is the docker daemon running on this host?
user@ :~$ docker version
Client:
Version: 1.11.2
API version: 1.23
Go version: go1.5.4
Git commit: b9f10c9
Built: Wed Jun 1 21:47:50 2016
OS/Arch: linux/amd64
Cannot connect to the Docker daemon. Is the docker daemon running on this host?
user@ :~$ sudo -i
root@ :~# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
hello-world latest 693bce725149 3 weeks ago 967 B
root@ :~# \
>
root@ :~#
root@ :~#
root@ :~#
root@ :~#
root@ :~#
root@ :~# DOCKER PS -a
DOCKER: command not found
root@ :~# docker ps -1
flag provided but not defined: -1
See 'docker ps --help'.
root@ :~# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
4e22edd9df8a hello-world "/hello" 2 days ago Exited (0) 2 days ago big_boyd
root@ :~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS
Release: 14.04
Codename: trusty
root@ :~# pwd
/root
root@ :~# mkdir docker-myproject
root@ :~# cd docker-myproject/
root@ :~/docker-myproject# ls
root@ :~/docker-myproject# vi Dockerfile
root@ :~/docker-myproject# vi Dockerfile
root@ :~/docker-myproject# vi Dockerfile
root@ :~/docker-myproject# vi Dockerfile
root@ :~/docker-myproject# vi Dockerfile
root@ :~/docker-myproject# vi Dockerfile
root@ :~/docker-myproject#
root@ :~/docker-myproject#
root@ :~/docker-myproject# docker build .
Sending build context to Docker daemon 2.048 kB
Step 1 : FROM ubuntu 14.04.3
Error parsing reference: "ubuntu 14.04.3" is not a valid repository/tag
root@ :~/docker-myproject# vi Dockerfile
root@ :~/docker-myproject#
root@ :~/docker-myproject#
root@ :~/docker-myproject# docker build .
Sending build context to Docker daemon 2.048 kB
Step 1 : FROM ubuntu:14.04.3
14.04.3: Pulling from library/ubuntu
8387d9ff0016: Pull complete
3b52deaaf0ed: Pull complete
4bd501fad6de: Pull complete
a3ed95caeb02: Pull complete
Digest: sha256:2febbcede4f3eb82ae0dc44518a2e2a7b06a0452685e64e6b13f51b278294780
Status: Downloaded newer image for ubuntu:14.04.3
---> 3876b81b5a81
Step 2 : RUN sudo apt-get install git
---> Running in cda85e00be34
Reading package lists...
Building dependency tree...
Reading state information...
The following extra packages will be installed:
ca-certificates git-man krb5-locales libasn1-8-heimdal libcurl3-gnutls
libedit2 liberror-perl libgssapi-krb5-2 libgssapi3-heimdal
libhcrypto4-heimdal libheimbase1-heimdal libheimntlm0-heimdal
libhx509-5-heimdal libidn11 libk5crypto3 libkeyutils1 libkrb5-26-heimdal
libkrb5-3 libkrb5support0 libldap-2.4-2 libroken18-heimdal librtmp0
libsasl2-2 libsasl2-modules libsasl2-modules-db libwind0-heimdal libx11-6
libx11-data libxau6 libxcb1 libxdmcp6 libxext6 libxmuu1 openssh-client
openssl patch rsync xauth
Suggested packages:
gettext-base git-daemon-run git-daemon-sysvinit git-doc git-el git-email
git-gui gitk gitweb git-arch git-bzr git-cvs git-mediawiki git-svn krb5-doc
krb5-user libsasl2-modules-otp libsasl2-modules-ldap libsasl2-modules-sql
libsasl2-modules-gssapi-mit libsasl2-modules-gssapi-heimdal ssh-askpass
libpam-ssh keychain monkeysphere ed diffutils-doc openssh-server
Recommended packages:
ssh-client
The following NEW packages will be installed:
ca-certificates git git-man krb5-locales libasn1-8-heimdal libcurl3-gnutls
libedit2 liberror-perl libgssapi-krb5-2 libgssapi3-heimdal
libhcrypto4-heimdal libheimbase1-heimdal libheimntlm0-heimdal
libhx509-5-heimdal libidn11 libk5crypto3 libkeyutils1 libkrb5-26-heimdal
libkrb5-3 libkrb5support0 libldap-2.4-2 libroken18-heimdal librtmp0
libsasl2-2 libsasl2-modules libsasl2-modules-db libwind0-heimdal libx11-6
libx11-data libxau6 libxcb1 libxdmcp6 libxext6 libxmuu1 openssh-client
openssl patch rsync xauth
0 upgraded, 39 newly installed, 0 to remove and 0 not upgraded.
Need to get 7671 kB of archives.
After this operation, 41.2 MB of additional disk space will be used.
Do you want to continue? [Y/n] Abort.
The command '/bin/sh -c sudo apt-get install git' returned a non-zero code: 1
root@ :~/docker-myproject# docker build .
Sending build context to Docker daemon 2.048 kB
Step 1 : FROM ubuntu:14.04.3
---> 3876b81b5a81
Step 2 : RUN sudo apt-get install git
---> Running in 1de93513f856
Reading package lists...
Building dependency tree...
Reading state information...
The following extra packages will be installed:
ca-certificates git-man krb5-locales libasn1-8-heimdal libcurl3-gnutls
libedit2 liberror-perl libgssapi-krb5-2 libgssapi3-heimdal
libhcrypto4-heimdal libheimbase1-heimdal libheimntlm0-heimdal
libhx509-5-heimdal libidn11 libk5crypto3 libkeyutils1 libkrb5-26-heimdal
libkrb5-3 libkrb5support0 libldap-2.4-2 libroken18-heimdal librtmp0
libsasl2-2 libsasl2-modules libsasl2-modules-db libwind0-heimdal libx11-6
libx11-data libxau6 libxcb1 libxdmcp6 libxext6 libxmuu1 openssh-client
openssl patch rsync xauth
Suggested packages:
gettext-base git-daemon-run git-daemon-sysvinit git-doc git-el git-email
git-gui gitk gitweb git-arch git-bzr git-cvs git-mediawiki git-svn krb5-doc
krb5-user libsasl2-modules-otp libsasl2-modules-ldap libsasl2-modules-sql
libsasl2-modules-gssapi-mit libsasl2-modules-gssapi-heimdal ssh-askpass
libpam-ssh keychain monkeysphere ed diffutils-doc openssh-server
Recommended packages:
ssh-client
The following NEW packages will be installed:
ca-certificates git git-man krb5-locales libasn1-8-heimdal libcurl3-gnutls
libedit2 liberror-perl libgssapi-krb5-2 libgssapi3-heimdal
libhcrypto4-heimdal libheimbase1-heimdal libheimntlm0-heimdal
libhx509-5-heimdal libidn11 libk5crypto3 libkeyutils1 libkrb5-26-heimdal
libkrb5-3 libkrb5support0 libldap-2.4-2 libroken18-heimdal librtmp0
libsasl2-2 libsasl2-modules libsasl2-modules-db libwind0-heimdal libx11-6
libx11-data libxau6 libxcb1 libxdmcp6 libxext6 libxmuu1 openssh-client
openssl patch rsync xauth
0 upgraded, 39 newly installed, 0 to remove and 0 not upgraded.
Need to get 7671 kB of archives.
After this operation, 41.2 MB of additional disk space will be used.
Do you want to continue? [Y/n] Abort.
The command '/bin/sh -c sudo apt-get install git' returned a non-zero code: 1
root@ :~/docker-myproject# git
usage: git [--version] [--help] [-C <path>] [-c name=value]
[--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]
[-p|--paginate|--no-pager] [--no-replace-objects] [--bare]
[--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]
<command> [<args>]
The most commonly used git commands are:
add Add file contents to the index
bisect Find by binary search the change that introduced a bug
branch List, create, or delete branches
checkout Checkout a branch or paths to the working tree
clone Clone a repository into a new directory
commit Record changes to the repository
diff Show changes between commits, commit and working tree, etc
fetch Download objects and refs from another repository
grep Print lines matching a pattern
init Create an empty Git repository or reinitialize an existing one
log Show commit logs
merge Join two or more development histories together
mv Move or rename a file, a directory, or a symlink
pull Fetch from and integrate with another repository or a local branch
push Update remote refs along with associated objects
rebase Forward-port local commits to the updated upstream head
reset Reset current HEAD to the specified state
rm Remove files from the working tree and from the index
show Show various types of objects
status Show the working tree status
tag Create, list, delete or verify a tag object signed with GPG
'git help -a' and 'git help -g' lists available subcommands and some
concept guides. See 'git help <command>' or 'git help <concept>'
to read about a specific subcommand or concept.
root@ :~/docker-myproject# ls
Dockerfile
root@ :~/docker-myproject# vi Dockerfile
这是我的Dockerfile：
FROM ubuntu:14.04.3
RUN sudo apt-get install git
docker图片返回：
ubuntu 14.04.3 3876b81b5a81 5 months ago 187.9 MB
图像是新创建的，但是出现在'5个月前'，如果这不是指示今天创建的那么？
因为已经安装了git然后导致此错误？ ：
After this operation, 41.2 MB of additional disk space will be used.
Do you want to continue? [Y/n] Abort.
The command '/bin/sh -c sudo apt-get install git' returned a non-zero code: 1
答案 0 :(得分：1)
默认情况下，如果APT即将安装一堆总大小超过某个值的软件包，它会在安装前要求您确认。但是，构建Docker镜像时运行的命令都是非交互式的，因此apt-get install git将无法得到问题的答案，因此它将在不执行任何操作的情况下退出。您需要在Dockerfile中使用apt-get install -y git才能说出＆＃34; yes＆＃34;自动提示。 （注意sudo在这里是多余的，因为该命令已经以root身份运行。）
由于您的Dockerfile在第一条指令上失败，docker build实际上并没有创建新图像。 docker images的输出显示您只有一张图片ubuntu:14.04.3，以及五个月前创建的图片。
Git尚未安装，＆＃34;因为它没有出现在官方ubuntu Docker图像中。是否在主机系统上安装了Git，对于它是否已安装在Docker镜像中绝对没有影响。
答案 1 :(得分：1)
使用apt-get install git -y重试git安装（如果需要，请使用sudo）。这应该有用。