Rails 容器与配置(2)

franket

发布于 2021-10-20 09:48:38

3650

发布于 2021-10-20 09:48:38

文章被收录于专栏：技术杂记

系统里多出来一个镜像，是rails的最新版

[root@h104 ~]# docker images | grep rails
rails                                   latest              afdddae9b2bf        46 hours ago        833.7 MB
[root@h104 ~]#

不得不说，还是有点大的 833.7 MB，相较而言一个完整的rails应用代码才区区几兆

[root@h202 ruby]# du -sh blog/
2.0M	blog/
[root@h202 ruby]#

可见 Rails 框架帮我们完成了多少额外工作，我们的核心代码也因此而精简

反观，Rails的框架依赖有多么臃肿，整个一大胖子，应该也是反映慢的原因之一吧

不过话说回来，正因为这些基础，这个应用可以自立根生，除了系统内核和Docker提供的隔离环境，它的运行不再看其它环境或基础设施的脸色，可以独立运行了

Tip: 同时，它依赖的那么多层基础镜像是可以和其它容器共享的，并非每次都是成倍的磁盘空间需求，大量相似容器的环境中，一定程度上还节约了磁盘空间

可以看看镜像的详细内容

[root@h104 blog2]# docker inspect afdddae9b2bf
[
{
    "Id": "afdddae9b2bf7469476e271850590aaee2e2c7353121e2801f4c3bd35b30e324",
    "RepoTags": [
        "rails:latest"
    ],
    "RepoDigests": [],
    "Parent": "fc2eabed675c24b767c4d78dfad2c8a525f778e06a81278a169e262e4ccc9eff",
    "Comment": "",
    "Created": "2016-04-27T17:18:03.953130492Z",
    "Container": "af60debb03e6f61c0e0d5875dd3859408151d335c59abf4e9ff986b3ada4c517",
    "ContainerConfig": {
        "Hostname": "bcad5a346f31",
        "Domainname": "",
        "User": "",
        "AttachStdin": false,
        "AttachStdout": false,
        "AttachStderr": false,
        "Tty": false,
        "OpenStdin": false,
        "StdinOnce": false,
        "Env": [
            "PATH=/usr/local/bundle/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
            "RUBY_MAJOR=2.3",
            "RUBY_VERSION=2.3.1",
            "RUBY_DOWNLOAD_SHA256=b87c738cb2032bf4920fef8e3864dc5cf8eae9d89d8d523ce0236945c5797dcd",
            "RUBYGEMS_VERSION=2.6.3",
            "BUNDLER_VERSION=1.11.2",
            "GEM_HOME=/usr/local/bundle",
            "BUNDLE_PATH=/usr/local/bundle",
            "BUNDLE_BIN=/usr/local/bundle/bin",
            "BUNDLE_SILENCE_ROOT_WARNING=1",
            "BUNDLE_APP_CONFIG=/usr/local/bundle",
            "RAILS_VERSION=4.2.6"
        ],
        "Cmd": [
            "/bin/sh",
            "-c",
            "gem install rails --version \"$RAILS_VERSION\""
        ],
        "Image": "5da847340e289b1357164d7a9f62ac6e67a557c63c4cb2c8823b4cb341776e15",
        "Volumes": null,
        "WorkingDir": "",
        "Entrypoint": null,
        "OnBuild": [],
        "Labels": {}
    },
    "DockerVersion": "1.9.1",
    "Author": "",
    "Config": {
        "Hostname": "bcad5a346f31",
        "Domainname": "",
        "User": "",
        "AttachStdin": false,
        "AttachStdout": false,
        "AttachStderr": false,
        "Tty": false,
        "OpenStdin": false,
        "StdinOnce": false,
        "Env": [
            "PATH=/usr/local/bundle/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
            "RUBY_MAJOR=2.3",
            "RUBY_VERSION=2.3.1",
            "RUBY_DOWNLOAD_SHA256=b87c738cb2032bf4920fef8e3864dc5cf8eae9d89d8d523ce0236945c5797dcd",
            "RUBYGEMS_VERSION=2.6.3",
            "BUNDLER_VERSION=1.11.2",
            "GEM_HOME=/usr/local/bundle",
            "BUNDLE_PATH=/usr/local/bundle",
            "BUNDLE_BIN=/usr/local/bundle/bin",
            "BUNDLE_SILENCE_ROOT_WARNING=1",
            "BUNDLE_APP_CONFIG=/usr/local/bundle",
            "RAILS_VERSION=4.2.6"
        ],
        "Cmd": [
            "irb"
        ],
        "Image": "5da847340e289b1357164d7a9f62ac6e67a557c63c4cb2c8823b4cb341776e15",
        "Volumes": null,
        "WorkingDir": "",
        "Entrypoint": null,
        "OnBuild": [],
        "Labels": {}
    },
    "Architecture": "amd64",
    "Os": "linux",
    "Size": 54280468,
    "VirtualSize": 833718357,
    "GraphDriver": {
        "Name": "devicemapper",
        "Data": {
            "DeviceId": "294",
            "DeviceName": "docker-253:0-134859501-afdddae9b2bf7469476e271850590aaee2e2c7353121e2801f4c3bd35b30e324",
            "DeviceSize": "107374182400"
        }
    }
}
]
[root@h104 blog2]#

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ruby on rails