[case34]jib Packed docker Mirror Actual Combat

  docker

Order

This article mainly studies how to use google’s jib to package docker images.

maven

            <plugin>
                <groupId>com.google.cloud.tools</groupId>
                <artifactId>jib-maven-plugin</artifactId>
                <version>0.9.9</version>
            </plugin>

Configuration

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <maven.build.timestamp.format>yyyyMMdd</maven.build.timestamp.format>
    </properties>


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>com.google.cloud.tools</groupId>
                <artifactId>jib-maven-plugin</artifactId>
                <version>0.9.9</version>
                <configuration>
                    <container>
                        <jvmFlags>
                            <jvmFlag>-Xms512m</jvmFlag>
                        </jvmFlags>
                        <ports>
                            <port>8080</port>
                        </ports>
                        <useCurrentTimestamp>true</useCurrentTimestamp>
                    </container>
                    <from>
                        <image>java:8u172-jre-alpine</image>
                    </from>
                    <to>
                        <image>jib-demo:${maven.build.timestamp}</image>
                    </to>
                    <allowInsecureRegistries>true</allowInsecureRegistries>
                    <extraDirectory>${project.basedir}/src/main/jib</extraDirectory>
                </configuration>
            </plugin>
        </plugins>
    </build>
  • Base image is specified here as java:8u172-jre-alpine
  • Also specify that the generated image name is jib-demo: $ {maven.build.timestamp}
  • The container tag can specify relevant parameters, such as jvmFlags specifying JVM parameters and ports specifying the port number of expose
  • ExtraDirectory is used to specify the directory to be added. the default value is $ {project.basedir}/src/main/jib, that is, the folders under this directory will be created synchronously in the doc mirror, and the directory hierarchy relationship will be subject to the directory hierarchy relationship under jib. For example, if there is app/resources/demo.txt under this directory, the corresponding mirror directory is/app /app/resources/demo.txt.

pack

mvn compile jib:dockerBuild -X
  • Using jib:dockerBuild is to package the image locally, not push to remote, and the -X parameter is to display debug information.
  • If you use the jib:build command, push to the remote after packaging.

Output log instance:

[DEBUG] TIMING    Building image to Docker daemon
[DEBUG] RUNNING    Building image to Docker daemon
[INFO] Getting base image java:8u172-jre-alpine...
[DEBUG] TIMING    Pulling base image manifest
[DEBUG] RUNNING    Pulling base image manifest
[DEBUG] TIMING    Building application layers
[DEBUG] RUNNING    Building application layers
[INFO] Building dependencies layer...
[DEBUG] TIMING    Building dependencies layer
[DEBUG] RUNNING    Building dependencies layer
[INFO] Building resources layer...
[DEBUG] TIMING    Building resources layer
[DEBUG] RUNNING    Building resources layer
[INFO] Building classes layer...
[DEBUG] TIMING    Building classes layer
[DEBUG] RUNNING    Building classes layer
[INFO] Building extra files layer...
[DEBUG] TIMING    Building extra files layer
[DEBUG] RUNNING    Building extra files layer
[DEBUG] TIMED    Building application layers : 3.498 ms
[DEBUG] Building application layers : 3.498 ms
[DEBUG] Building extra files layer built sha256:0a9321c621ee2c138d9a93f4ba47f825e20dd7aca0e9206f30bf560122fdaa31
[DEBUG] Building resources layer built sha256:933116c8da4db70000355b750af2f3b5c4545e74db7b5eb0a5e37689ef86d44f
[DEBUG] Building classes layer built sha256:a99dbde7d015ba3d15b9265ac38f6536d65b00dd2a864b7003a34742f483939b
[DEBUG] TIMED    Building extra files layer : 33.718 ms
[DEBUG] TIMED    Building classes layer : 33.901 ms
[DEBUG] Building extra files layer : 33.718 ms
[DEBUG] TIMED    Building resources layer : 34.062 ms
[DEBUG] Building resources layer : 34.062 ms
[DEBUG] Building classes layer : 33.901 ms
[DEBUG] Building dependencies layer built sha256:a19961ec08095eb70ca3a070945223dcf51500a255a745272276139bf0a29f4e
[DEBUG] TIMED    Building dependencies layer : 1047.83 ms
[DEBUG] Building dependencies layer : 1047.83 ms
[INFO] The base image requires auth. Trying again for java:8u172-jre-alpine...
//......
[DEBUG] TIMED    Pulling base image manifest : 8959.891 ms
[DEBUG] Pulling base image manifest : 8959.891 ms
[DEBUG] TIMING    Setting up base image caching
[DEBUG] RUNNING    Setting up base image caching
[DEBUG] TIMED    Setting up base image caching : 0.824 ms
[DEBUG] Setting up base image caching : 0.824 ms
[DEBUG] TIMING    Pulling base image layer sha256:500c0ac4cdc58aee9a008e70466eeec8a4b74b25c29d003764635d2fe1b42827
[DEBUG] RUNNING    Pulling base image layer sha256:500c0ac4cdc58aee9a008e70466eeec8a4b74b25c29d003764635d2fe1b42827
[DEBUG] TIMING    Pulling base image layer sha256:aa38cd8c77d7320c7489327775e074580db5f23467198aab3e79c7db5cdfbdca
[DEBUG] TIMING    Pulling base image layer sha256:cb56d62302ec31640b40ca15843e7af6be145966a1064c78ea7afd6f10ce49e6
[DEBUG] RUNNING    Pulling base image layer sha256:cb56d62302ec31640b40ca15843e7af6be145966a1064c78ea7afd6f10ce49e6
[DEBUG] TIMING    Pulling base image layer sha256:ff3a5c916c92643ff77519ffa742d3ec61b7f591b6b7504599d95a4a41134e28
[DEBUG] RUNNING    Pulling base image layer sha256:ff3a5c916c92643ff77519ffa742d3ec61b7f591b6b7504599d95a4a41134e28
[DEBUG] RUNNING    Pulling base image layer sha256:aa38cd8c77d7320c7489327775e074580db5f23467198aab3e79c7db5cdfbdca
[DEBUG] TIMED    Pulling base image layer sha256:500c0ac4cdc58aee9a008e70466eeec8a4b74b25c29d003764635d2fe1b42827 : 612.524 ms
[DEBUG] Pulling base image layer sha256:500c0ac4cdc58aee9a008e70466eeec8a4b74b25c29d003764635d2fe1b42827 : 612.524 ms
[DEBUG] TIMED    Pulling base image layer sha256:ff3a5c916c92643ff77519ffa742d3ec61b7f591b6b7504599d95a4a41134e28 : 9985.702 ms
[DEBUG] Pulling base image layer sha256:ff3a5c916c92643ff77519ffa742d3ec61b7f591b6b7504599d95a4a41134e28 : 9985.702 ms
[DEBUG] TIMED    Pulling base image layer sha256:aa38cd8c77d7320c7489327775e074580db5f23467198aab3e79c7db5cdfbdca : 27267.144 ms
[DEBUG] Pulling base image layer sha256:aa38cd8c77d7320c7489327775e074580db5f23467198aab3e79c7db5cdfbdca : 27267.144 ms
[DEBUG] TIMED    Pulling base image layer sha256:cb56d62302ec31640b40ca15843e7af6be145966a1064c78ea7afd6f10ce49e6 : 54734.971 ms
[DEBUG] Pulling base image layer sha256:cb56d62302ec31640b40ca15843e7af6be145966a1064c78ea7afd6f10ce49e6 : 54734.971 ms
[DEBUG] TIMING    Building container configuration
[DEBUG] RUNNING    Building container configuration
[INFO] Finalizing...
[DEBUG] TIMED    Building container configuration : 0.462 ms
[DEBUG] Building container configuration : 0.462 ms
[INFO] Loading to Docker daemon...
[DEBUG] TIMED    Building image to Docker daemon : 65862.956 ms
[DEBUG] Building image to Docker daemon : 65862.956 ms
[INFO]
[INFO] Container entrypoint set to [java, -Xms512m, -cp, /app/resources/:/app/classes/:/app/libs/*, com.example.JibDemoApplication]
[INFO]
[INFO] Built image to Docker daemon as jib-demo:20180826
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 01:07 min
[INFO] Finished at: 2018-08-26T21:38:11+08:00
[INFO] Final Memory: 26M/493M
[INFO] ------------------------------------------------------------------------

View mirror

docker inspect jib-demo:20180826
[
    {
        "Id": "sha256:7554492dde84091bc6d015b29ec4bf854bb841b9ec4d8f7bef8b51a8ec59ef94",
        "RepoTags": [
            "jib-demo:20180826"
        ],
        "RepoDigests": [],
        "Parent": "",
        "Comment": "",
        "Created": "2018-08-26T13:37:05.65Z",
        "Container": "",
        "ContainerConfig": {
            "Hostname": "",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": null,
            "Cmd": null,
            "Image": "",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": null
        },
        "DockerVersion": "",
        "Author": "",
        "Config": {
            "Hostname": "",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "ExposedPorts": {
                "8080/tcp": {}
            },
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/opt/jdk1.8.0_172/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "JAVA_HOME=/opt/jdk1.8.0_172"
            ],
            "Cmd": [],
            "Image": "",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": [
                "java",
                "-Xms512m",
                "-cp",
                "/app/resources/:/app/classes/:/app/libs/*",
                "com.example.JibDemoApplication"
            ],
            "OnBuild": null,
            "Labels": {}
        },
        "Architecture": "amd64",
        "Os": "linux",
        "Size": 186079594,
        "VirtualSize": 186079594,
        "GraphDriver": {
            "Data": null,
            "Name": "aufs"
        },
        "RootFS": {
            "Type": "layers",
            "Layers": [
                "sha256:cd7100a72410606589a54b932cabd804a17f9ae5b42a1882bd56d263e02b6215",
                "sha256:317e0b42ef29551507adc792c2dbc389af85c5d68900cf0f08abe907cbd4e199",
                "sha256:d6fd5302a9ee64c43b46153e9678153819d6d0e247381acbbe6cbe6ed9de0366",
                "sha256:417c6bd0930eb69d17ae5d601898a6a012900ca33c69e612840a3042b2451cbb",
                "sha256:8309a5eed5158c5639acb664312ddc7027a2ecb172744f548d6d9fb5f918a744",
                "sha256:6ef8c795d7a5e2a07f51d572a90b820e089f89adf30798193f4f3f410a261415",
                "sha256:9990447f3d37e3f2dc70718d0ea6602cf7843091d8bbe395f552c9c5dd10551c",
                "sha256:ff7910aaeee962d1d86e00742030378a2758da59d8c8cda3fe44314bbddd8081"
            ]
        },
        "Metadata": {
            "LastTagTime": "0001-01-01T00:00:00Z"
        }
    }
]
  • You can see that java -cp specifies the three folders /app/libs/, /app/resources/, /app/classes/.

Summary

Jib performs the following operations by default

COPY libs /app/libs/
COPY resources /app/resources/
COPY classes /app/classes/

In other words, libs are copied to /app/libs, resources are copied to /app/resources, and classes are copied to /app/classes.

doc