LXDCLIでサクッとjavaの環境を用意する

目的

Javaでアプリケーションを開発しなさいというお達しが来ました。しかし、僕にはjavaの開発環境がありません。今回はLXDCLIでさくっとjava環境を手に入れましょう。

ファイルの用意

lxdfile

FROM ubuntu/22.04

RUN systemctl restart systemd-resolved
RUN echo "nameserver 8.8.8.8" >> /etc/resolv.conf
RUN dhclient


RUN export DEBIAN_FRONTEND=noninteractive
RUN timedatectl set-timezone Asia/Tokyo && hostnamectl set-hostname ubuntu-java2
RUN apt-get -y update

RUN dpkg --configure -a
RUN echo "\n\n\n" | apt-get -y install openssh-server
RUN apt-get -y install docker docker.io docker-compose nano curl openjdk-17-jdk

RUN echo -e "root:password" | chpasswd
RUN echo -e 'PermitRootLogin  yes' >> /etc/ssh/sshd_config


RUN systemctl enable ssh
RUN systemctl restart ssh
RUN systemctl start ssh


RUN echo "JAVA_HOME=$(readlink -f /usr/bin/javac | sed "s:/bin/javac::")" >  ~/.bashrc
RUN echo "export JAVA_HOME" > ~/.bashrc
RUN echo "PATH=$PATH:$JAVA_HOME/bin" > ~/.bashrc
RUN echo "export PATH" > ~/.bashrc
RUN source ~/.bashrc

RUN mkdir -p ~/tmp/hello-java

構築

$ lxdcli build lxdfile

ログイン

$ lxc shell ubuntu-java

確認

root@ubuntu-java:~# java
Usage: java [options] <mainclass> [args...]
           (to execute a class)
   or  java [options] -jar <jarfile> [args...]
           (to execute a jar file)
   or  java [options] -m <module>[/<mainclass>] [args...]
       java [options] --module <module>[/<mainclass>] [args...]
           (to execute the main class in a module)
   or  java [options] <sourcefile> [args]
           (to execute a single source-file program)

 Arguments following the main class, source file, -jar <jarfile>,
 -m or --module <module>/<mainclass> are passed as the arguments to
 main class.