docker安裝jdk8

1.下載jdk8   好比nacos會引用此變量

安裝1.8.0的全部文件
yum install java-1.8.0-openjdk* -y
使用命令檢查是否安裝成功
java -version

  jdk自動安裝目錄爲：/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.212.b04-0.el7_6.x86_64
  配置環境變量：

在 /etc/profile 文件中加入以下內容：
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

執行下面命令使設置生效
source /etc/profile

下載tomcat8  暫不用

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

2.建立dockerfile文件

FROM centos:latest
#使用ADD指令會直接對jdk-8u141-linux-x64.tar.gz進行解壓 不用單獨的tar解壓
ADD jdk-8u141-linux-x64.tar.gz /usr/local/
ENV JAVA_HOME /usr/local/jdk1.8.0_141
ENV CLASSPATH $JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
ENV PATH $PATH:$JAVA_HOME/bin

3.用dockerfile文件建立jdk鏡像

[root@insure jdk8]# docker build -t jdk-8u141:20181222 . -f dockerfile
Sending build context to Docker daemon  185.5MB
Step 1/5 : FROM centos:latest
 ---> 1e1148e4cc2c
Step 2/5 : ADD jdk-8u141-linux-x64.tar.gz /usr/local/
 ---> 65475cb92b9e
Step 3/5 : ENV JAVA_HOME /usr/local/jdk1.8.0_141
 ---> Running in 4537fa128bf8
Removing intermediate container 4537fa128bf8
 ---> a5ec3ad7eefd
Step 4/5 : ENV CLASSPATH $JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
 ---> Running in 170040d357ac
Removing intermediate container 170040d357ac
 ---> 70417d2b9cad
Step 5/5 : ENV PATH $PATH:$JAVA_HOME/bin
 ---> Running in eacfe0487c6a
Removing intermediate container eacfe0487c6a
 ---> c717428b1276
Successfully built c717428b1276
Successfully tagged jdk-8u141:20181222
[root@insure jdk8]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
jdk-8u141           20181222            c717428b1276        18 seconds ago      578MB
centos              latest              1e1148e4cc2c        2 weeks ago         202MB
openjdk             latest              8e7eacedab93        2 weeks ago         986MB

命令說明:使用-f 指定要使用的dockerfile，若是不指定會尋找當前目錄名爲dockerfile的文件 

 -t 指定鏡像的名稱和tag

4.運行建立的鏡像

[root@insure jdk8]# docker run -d -it jdk-8u141:20181222 /bin/bash
14c0f65b236c89c84723fe9e3f7011e405f388bf443608f054aaf24d5c290882
[root@insure jdk8]# docker ps -a
CONTAINER ID        IMAGE                COMMAND             CREATED             STATUS              PORTS               NAMES
14c0f65b236c        jdk-8u141:20181222   "/bin/bash"         5 seconds ago       Up 4 seconds                            vigorous_yonath