如何减小RHEL/Centos/Fedora Docker图像的大小

是的,Docker图像大小可以通过执行“yum clean all”显著减少

Dockerfile-RHEL图像(+bc)=505M

# Build command
# docker build -t rhel7base:latest --build-arg REG_USER='<redhat_developer_user>' --build-arg REG_PSWD='<password>' --squash .

FROM registry.access.redhat.com/rhel7/rhel:latest

LABEL maintainer="tim"

ARG REG_USER=none
ARG REG_PSWD=none

RUN subscription-manager register --username $REG_USER --password $REG_PSWD --auto-attach && \
    subscription-manager repos --enable rhel-server-rhscl-7-rpms && \
    yum install -y bc

Dockerfile-RHEL图像(+bc),“yum clean all”=207M,节省298M

# Build command
# docker build -t rhel7base:latest --build-arg REG_USER='<redhat_developer_user>' --build-arg REG_PSWD='<password>' --squash .

FROM registry.access.redhat.com/rhel7/rhel:latest

LABEL maintainer="tim"

ARG REG_USER=none
ARG REG_PSWD=none

RUN subscription-manager register --username $REG_USER --password $REG_PSWD --auto-attach && \
    subscription-manager repos --enable rhel-server-rhscl-7-rpms && \
    yum install -y bc && \
    yum clean all && \
    rm -rf /var/cache/yum

https://blog.docker.com/2017/01/whats-new-in-docker-1-13/

我找到了使用“yum clean all”的解决方案 https://medium.com/@vaceletm/docker-layers-cost-b28cb13cb627

添加“rm-rf/var/cache/yum”来自“yum clean all”输出中的建议

除了TJA的答案之外,您还可以使用更小的CentOS基图像,例如,存在Debian灯光,它被称为Bitnami

https://hub.docker.com/r/bitnami/minideb-extras/

对于CentOS,也许你可以使用

https://hub.docker.com/r/blalor/centos/

您还可以尝试使用2种工具减小图像的大小

https://github.com/mvanholsteijn/strip-docker-image

https://github.com/docker-slim/docker-slim