I have 2 Dockerfile.
First is
FROM centos:7
RUN yum update -y && \
yum install -y kde-l10n-Chinese && \
yum install -y glibc-common
and other is
FROM centos:7
RUN yum update -y
RUN yum install -y kde-l10n-Chinese
RUN yum install -y glibc-common
the docker image i get is like:
It bothers me, the official documentation says because of the number of layers, but I understand that each layer reuses the previous one, so there's no reason they should be 300mb different。
I would appreciate it if anyone could look into this problem for me. thank you.
when i use dive level:multi, it show me like:
the module i use is like: (excluded unmodified file)
Related
I use the following Dockerfile to build an image and start a container. But once I am in the container, I still can not find manpages. Does anybody know how to solve this problem?
$ cat Dockerfile
FROM ubuntu
RUN apt -y update && apt -y upgrade
RUN apt-get -y install build-essential
RUN apt-get -y install vim
RUN apt-get -y install man
RUN apt-get -y install gawk
RUN apt-get -y install mawk
$ man man
No manual entry for man
See 'man 7 undocumented' for help when manual pages are not available.
$ find /usr/share/man /usr/local/share/man -type f
You need to make a change to your /etc/dpkg/dpkg.cfg.d/excludes within the container. You can do this in your Dockerfile with the following command:
RUN sed -i 's:^path-exclude=/usr/share/man:#path-exclude=/usr/share/man:' \
/etc/dpkg/dpkg.cfg.d/excludes
Then make another update to your Dockerfile to install the man pages
RUN apt-get update && \
apt-get install -y \
man \
manpages-posix
There is a easier way to enable the MAN command.
In terminal, just execute the command below:
unminimize
It will ask if you like to continue [Y/n]
Just press:
Y
It will take a while to finish all the processing.
After that, test this:
man man
Simple as that
Thanks to #kazushi
I have 2 dockerfiles:
FROM ubuntu:20.04
RUN apt-get update && apt-get install -y \
software-properties-common \
python3
FROM ubuntu:20.04
RUN apt-get update
RUN apt-get install -y software-properties-common
RUN apt-get update && apt-get install -y \
python3
The thing is: when I run the first of them (with docker build) the build process hangs on:
The software-properties-common package is asking me about the geographical area - I cannot provide any input, it is not allowed when building images, I suppose.
However, when I build the second dockerfile, this problem does not occur. I'm curious - why is that?
Add the following line in your Dockerfile and build again.
RUN DEBIAN_FRONTEND=noninteractive apt-get install -y tzdata
I found that running
ln -fs /usr/share/zoneinfo/UTC /etc/localtime
before setting DEBIAN_FRONTEND=noninteractive worked for me. (You'd want to replace the bit after zoneinfo with whatever is applicable for you.)
If you need it to be set dynamically, [this answer] (https://stackoverflow.com/a/63153978/1995015) suggests calling out to a website that can provide that.
I use the following Dockerfile to build an image and start a container. But once I am in the container, I still can not find manpages. Does anybody know how to solve this problem?
$ cat Dockerfile
FROM ubuntu
RUN apt -y update && apt -y upgrade
RUN apt-get -y install build-essential
RUN apt-get -y install vim
RUN apt-get -y install man
RUN apt-get -y install gawk
RUN apt-get -y install mawk
$ man man
No manual entry for man
See 'man 7 undocumented' for help when manual pages are not available.
$ find /usr/share/man /usr/local/share/man -type f
You need to make a change to your /etc/dpkg/dpkg.cfg.d/excludes within the container. You can do this in your Dockerfile with the following command:
RUN sed -i 's:^path-exclude=/usr/share/man:#path-exclude=/usr/share/man:' \
/etc/dpkg/dpkg.cfg.d/excludes
Then make another update to your Dockerfile to install the man pages
RUN apt-get update && \
apt-get install -y \
man \
manpages-posix
There is a easier way to enable the MAN command.
In terminal, just execute the command below:
unminimize
It will ask if you like to continue [Y/n]
Just press:
Y
It will take a while to finish all the processing.
After that, test this:
man man
Simple as that
Thanks to #kazushi
I'm trying to simply create a dockerfile that installs wget and unzip on a centOS image. This is the file:
FROM centos:latest
EXPOSE 9000
RUN echo "proxy=http://xxx.xxx.xxx.xxx:x" >> /etc/yum.conf \
&& echo "proxy_username=username" >> /etc/yum.conf \
&& echo "proxy_password=password" >> /etc/yum.conf \
&& yum update \
&& yum -y install wget unzip
...
When I run the build it resolves the dependencies just fine but it doesn't seem to be honoring the -y flag and assuming yes for any prompts:
Total download size: 61 M
Is this ok [y/d/N]: Exiting on user command
Your transaction was saved, rerun it with:
yum load-transaction /tmp/yum_save_tx.2018-08-08.21-22.Q7f8LW.yumtx
The command '/bin/sh -c yum update && yum -y install wget unzip' returned
a non-zero code: 1
I've used the -y flag in this situation many times and have never had any trouble. It doesn't seem like this could be a caching issue but I have no idea what's going on. I also tried yum install -y wget unzip just for good measure but still no luck (as expected). I've searched stackoverflow but it seems like anyone with the same issue just wasn't using the -y flag. Any guidance would be appreciated because I don't know what could be going wrong with such a simple file.
It looks like you're missing the -y on the yum update.
Also, you should split those commands out to separate RUN commands. In this case, it doesn't make too much difference, but splitting the echos onto different lines will make it clearer.
You should keep the update and installs in the same command though
https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#run
I have following docker file, I want to specifically install a rpm file that is available on my disk as I am building docker instance. My invocation of rpm install looks like this. Command
RUN rpm -i chrpath-0.13-14.el7.x86_64.rpm fails.
Is there a way to install rpm file available locally to new Docker instance?
FROM centos:latest
RUN yum -y install yum-utils
RUN yum -y install python-setuptools
RUN easy_install supervisor
RUN mkdir -p /var/log/supervisor
RUN yum -y install which
RUN yum -y install git
# Basic build dependencies.
RUN yum -y install autoconf build-essential unzip zip
# Gold linker is much faster than standard linker.
RUN yum -y install binutils
# Developer tools.
RUN yum -y install bash-completion curl emacs git man-db python-dev python-pip vim tar
RUN yum -y install gcc gcc-c++ kernel-devel make
RUN yum -y install swig
RUN yum -y install wget
RUN yum -y install python-devel
RUN yum -y install ntp
RUN rpm -i chrpath-0.13-14.el7.x86_64.rpm
Put this line before your rpm -i command:
ADD /host/abs/path/to/chrpath-0.13-14.el7.x86_64.rpm /chrpath-0.13-14.el7.x86_64.rpm
Then you'll be able to do
RUN rpm -i chrpath-0.13-14.el7.x86_64.rpm
As and addendum to what others have written here, rather than using:
RUN rpm -i xyz.rpm
You might be better off doing this:
RUN yum install -y xyz.rpm
The latter has the advantages that (a) it checks the signature, (b) downloads any dependencies, and (c) makes sure YUM knows about the package. This last bit is less important than the other two, but it's still worthwhile.
Suppose you have your Dockerfile available at /opt/myproject/. Then first you have to put rpm inside /opt/myproject and then add
Add /xyz.rpm /xyz.rpm
RUN rpm -i xyz.rpm