docker安装jdk8

1.下载jdk8   比如nacos会引用此变量

安装1.8.0的所有文件
yum install java-1.8.0-openjdk* -y
使用命令检查是否安装成功
java -version

jdk自动安装目录为：/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.212.b04-0.el7_6.x86_64
  配置环境变量：

在 /etc/profile 文件中加入如下内容：
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.212.b04-0.el7_6.x86_64
export JRE_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.212.b04-0.el7_6.x86_64
export CLASSPATH=.:$JAVA_HOME/jre/lib:$JAVA_HOME/lib
export PATH=$PATH:$JAVA_HOME/bin

执行下面命令使设置生效
source /etc/profile

下载tomcat8  暂不用

wget https://archive.apache.org/dist/tomcat/tomcat-8/v8.0.23/bin/apache-tomcat-8.0.23.tar.gz

2.创建dockerfile文件

FROM centos:latest
#使用ADD指令会直接对jdk-8u141-linux-x64.tar.gz进行解压 不用单独的tar解压
ADD jdk-8u141-linux-x64.tar.gz /usr/local/
ENV JAVA_HOME /usr/local/jdk1..0_141
ENV CLASSPATH $JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
ENV PATH $PATH:$JAVA_HOME/bin

3.用dockerfile文件创建jdk镜像

[root@insure jdk8]# docker build -t jdk-8u141: . -f dockerfile
Sending build context to Docker daemon  .5MB
Step / : FROM centos:latest
 ---> 1e1148e4cc2c
Step / : ADD jdk-8u141-linux-x64.tar.gz /usr/local/
 ---> 65475cb92b9e
Step / : ENV JAVA_HOME /usr/local/jdk1..0_141
 ---> Running in 4537fa128bf8
Removing intermediate container 4537fa128bf8
 ---> a5ec3ad7eefd
Step / : ENV CLASSPATH $JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
 ---> Running in 170040d357ac
Removing intermediate container 170040d357ac
 ---> 70417d2b9cad
Step / : ENV PATH $PATH:$JAVA_HOME/bin
 ---> Running in eacfe0487c6a
Removing intermediate container eacfe0487c6a
 ---> c717428b1276
Successfully built c717428b1276
Successfully tagged jdk-8u141:
[root@insure jdk8]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
jdk-8u141                       c717428b1276         seconds ago      578MB
centos              latest              1e1148e4cc2c         weeks ago         202MB
openjdk             latest              8e7eacedab93         weeks ago         986MB

命令说明:使用-f 指定要使用的dockerfile，如果不指定会寻找当前目录名为dockerfile的文件

-t 指定镜像的名称和tag

4.运行创建的镜像

[root@insure jdk8]# docker run -d -it jdk-8u141: /bin/bash
14c0f65b236c89c84723fe9e3f7011e405f388bf443608f054aaf24d5c290882
[root@insure jdk8]# docker ps -a
CONTAINER ID        IMAGE                COMMAND             CREATED             STATUS              PORTS               NAMES
14c0f65b236c        jdk-8u141:   "/bin/bash"          seconds ago       Up  seconds                            vigorous_yonath