如何创建基于Alpine Linux的JRE环境

• Alpine的更新源配置文件repositories内容,如果自建源，可以替换成本地的源，国外源实在太慢

• Alpine的更新源配置文件repositories内容,如果自建源，可以替换成本地的源，国外源实在太慢

1. [root@localhost jre8]#  cat repositories

2. http://nl.alpinelinux.org/alpine/v3.5/main

3. http://nl.alpinelinux.org/alpine/v3.5/community

• Dockerfile 内容如下

1. FROM alpine:3.5

2. MAINTAINER jre8.111

4. ENV JAVA_HOME=/usr/lib/jvm/default-jvm/jre

6. add repositories /etc/apk/repositories

8. RUN apk upgrade --update-cache; \

9.    apk add openjdk8-jre; \

10.    rm -rf /tmp/* /var/cache/apk/*

12. CMD ["java", "-version"]

• 执行命令创建docker镜像

1. [root@localhost jre8]#  docker build -t 192.168.138.123/docker-jre:8u111_14r1 .

• 确认是否执行成功

1. [root@localhost jre8]# docker images

2. REPOSITORY                  TAG                 IMAGE ID            CREATED             SIZE

3. 192.168.138.123/docker-jre   8u111_14r1          abd8e22c1bb1        14 seconds ago      76.8 MB

4. docker.io/alpine            3.5                 88e169ea8f46        3 weeks ago         3.98 MB

5. docker.io/alpine            latest              88e169ea8f46        3 weeks ago         3.98 MB

• 运行容器看看内容是否正常

1. [root@localhost jre8]# docker run --name test -tid   abd8e22c1bb1  sh

2. [root@localhost jre8]# docker-enter   test

3. 3d876724639b:~# java -version

4. openjdk version "1.8.0_111"

5. OpenJDK Runtime Environment (IcedTea 3.2.0) (Alpine 8.111.14-r1)

6. OpenJDK 64-Bit Server VM (build 25.111-b14, mixed mode)

• docker-enter是什么，把下面的脚本保存，放置到/bin/下面 

1. [root@10 ~]# vim /bin/docker-enter

2. #!/bin/sh

3. if [ -e $(dirname "$0")/nsenter ]; then

4.        # with boot2docker, nsenter is not in the PATH but it is in the same folder

5.        NSENTER=$(dirname "$0")/nsenter

6. else

7.        NSENTER=nsenter

8. fi

9. if [ -z "$1" ]; then

10.        echo "Usage: `basename "$0"` CONTAINER [COMMAND [ARG]...]"

11.        echo ""

12.        echo "Enters the Docker CONTAINER and executes the specified COMMAND."

13.        echo "If COMMAND is not specified, runs an interactive shell in CONTAINER."

14. else

15.        PID=$(docker inspect --format "{{.State.Pid}}" "$1")

16.        if [ -z "$PID" ]; then

17.          exit 1

18.        fi

19.        shift

20.        OPTS="--target $PID --mount --uts --ipc --net --pid --"

21.        if [ -z "$1" ]; then

22.          "$NSENTER" $OPTS su - root

23.        else

24.          "$NSENTER" $OPTS env --ignore-environment -- "$@"

25.        fi

26. fi

27. [root@10 ~]# chmod +x /bin/docker-enter

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