# 编写子镜像dockerfile [root@slions_pc1 omg]# cat Dockerfile FROM slions:father RUN echo 123 > /file # 构建子镜像，从这里就能看出来已经开始安装软件了 [root@slions_pc1 omg]# docker build -t slions:son . Sending build context to Docker daemon 2.048kB Step 1/2 : FROM slions:father # Executing 2 build triggers ---> Running in 43e3db71fb7b Removing intermediate container 43e3db71fb7b ---> Running in 22c5c6450487 Loaded plugins: fastestmirror, ovl Determining fastest mirrors * base: mirrors.aliyun.com * extras: mirrors.huaweicloud.com * updates: mirrors.aliyun.com Resolving Dependencies --> Running transaction check ---> Package iproute.x86_64 0:4.11.0-30.el7 will be installed --> Processing Dependency: libmnl.so.0(LIBMNL_1.0)(64bit) for package: iproute-4.11.0-30.el7.x86_64 --> Processing Dependency: libxtables.so.10()(64bit) for package: iproute-4.11.0-30.el7.x86_64 --> Processing Dependency: libmnl.so.0()(64bit) for package: iproute-4.11.0-30.el7.x86_64 --> Running transaction check ---> Package iptables.x86_64 0:1.4.21-35.el7 will be installed --> Processing Dependency: libnfnetlink.so.0()(64bit) for package: iptables-1.4.21-35.el7.x86_64 --> Processing Dependency: libnetfilter_conntrack.so.3()(64bit) for package: iptables-1.4.21-35.el7.x86_64 ---> Package libmnl.x86_64 0:1.0.3-7.el7 will be installed --> Running transaction check ---> Package libnetfilter_conntrack.x86_64 0:1.0.6-1.el7_3 will be installed ---> Package libnfnetlink.x86_64 0:1.0.1-4.el7 will be installed --> Finished Dependency Resolution
Dependencies Resolved
================================================================================ Package Arch Version Repository Size ================================================================================ Installing: iproute x86_64 4.11.0-30.el7 base 805 k Installing for dependencies: iptables x86_64 1.4.21-35.el7 base 432 k libmnl x86_64 1.0.3-7.el7 base 23 k libnetfilter_conntrack x86_64 1.0.6-1.el7_3 base 55 k libnfnetlink x86_64 1.0.1-4.el7 base 26 k
$ docker build --help Usage: docker build [OPTIONS] PATH | URL | - Build an image from a Dockerfile Options: --add-host list Add a custom host-to-IP mapping (host:ip) --build-arg list Set build-time variables --cache-from strings Images to consider as cache sources --cgroup-parent string Optional parent cgroup for the container --compress Compress the build context using gzip --cpu-period int Limit the CPU CFS (Completely Fair Scheduler) period --cpu-quota int Limit the CPU CFS (Completely Fair Scheduler) quota -c, --cpu-shares int CPU shares (relative weight) --cpuset-cpus string CPUs in which to allow execution (0-3, 0,1) --cpuset-mems string MEMs in which to allow execution (0-3, 0,1) --disable-content-trust Skip image verification (default true) -f, --file string Name of the Dockerfile (Default is 'PATH/Dockerfile') --force-rm Always remove intermediate containers --iidfile string Write the image ID to the file --isolation string Container isolation technology --label list Set metadata for an image -m, --memory bytes Memory limit --memory-swap bytes Swap limit equal to memory plus swap: '-1' to enable unlimited swap --network string Set the networking mode for the RUN instructions during build (default "default") --no-cache Do not use cache when building the image --pull Always attempt to pull a newer version of the image -q, --quiet Suppress the build output and print image ID on success --rm Remove intermediate containers after a successful build (default true) --security-opt strings Security options --shm-size bytes Size of /dev/shm -t, --tag list Name and optionally a tag in the 'name:tag' format --target string Set the target build stage to build. --ulimit ulimit Ulimit options (default [])
