How to use Dockerfile to create an image of the java running environment

The current environment used is:

• ##centos 7.5

##docker-ce 18.06.1-ce

1. First use the basic image of centos7.5.1804 to install some environments required for operation.

Create the corresponding file directory in the /app directory.

[root@node2 /app/]# mkdir dockerfile/{web/{nginx,tomcat,jdk,apache},system/{centos,ubuntu,redhat}} -pv
[root@node2 /app]# cd dockerfile/system/centos/
[root@node2 /app/dockerfile/system/centos]# mkdir centos-7.5-base
[root@node2 /app/dockerfile/system/centos]# cd centos-7.5-base

Create a dockerfile file

[root@node2 /app/dockerfile/system/centos/centos-7.5-base]#vim dockerfile 
#nginx base image
from centos:7.5.1804

label maintaier "mr.luo <mr.luo@dklwj.com>"

run yum install -y vim wget pcre pcre-devel zlib zlib-devel openssl openssl-devel iproute net-tools iotop

Create a direct docker build script and then execute the script directly

[root@node2 /app/dockerfile/system/centos/centos-7.5-base]#vim build-command.sh 
#!/bin/bash
docker build -t 172.20.7.50/baseimages/centos-base:7.5.1804 .

Execute the script to create a new image

[root@node2 /app/dockerfile/system/centos/centos-7.5-base]#bash build-command.sh 
sending build context to docker daemon 3.072kb
step 1/3 : from centos:7.5.1804
---> 76d6bc25b8a5
step 2/3 : label maintaier 'mr.luo@dklwj.com'
---> using cache
---> 05ccd970d71d
step 3/3 : run yum install -y vim wget  pcre pcre-devel zlib zlib-devel openssl openssl-devel iproute net-tools iotop
---> using cache
---> 73d683a54877
successfully built 73d683a54877
successfully tagged 172.20.7.50/baseimages/centos-base:7.5.1804

2. Use the prepared basic environment image to create a jdk image

Exit from centos-7.5-base and create a jdk1.8 directory in the current directory.

[root@node2 /app/dockerfile/system/centos/centos-7.5-base]# cd ..
[root@node2 /app/dockerfile/system/centos]# mkdir jdk1.8
[root@node2 /app/dockerfile/system/centos]# cd jdk1.8/

Create dockerfile

[root@node2 /app/dockerfile/system/centos/jdk1.8]#vim dockerfile 
from 172.20.7.50/baseimages/centos-base:7.5.1804
label maintainer "mr.luo <mr.luo@dklwj.com>"

add jdk-8u162-linux-x64.tar.gz /usr/local/src/
run ln -s /usr/local/src/jdk1.8.0_162/ /usr/local/jdk

add profile /etc/profile

env java_home /usr/local/jdk
env jre_home $java_home/jre
env classpath $java_home/lib/:$jre_home/lib/
env path $path:$java_home/bin

run rm -rf /etc/localtime && ln -snf /usr/share/zoneinfo/asia/shanghai /etc/localtime && echo "asia/shanghai" > /etc/timezone

Upload the jdk package to the current directory:

Copy the /etc/profile file to the current directory

[root@node2 /app/dockerfile/system/centos/jdk1.8]#cp profile /etc/profile

Add jdk at the end of the profile Environment variables

[root@node2 /app/dockerfile/system/centos/jdk1.8]#vim profile 
export java_home=/usr/local/jdk
export tomcat_home=/apps/tomcat
export path=$java_home/bin:$java_home/jre/bin:$tomcat_home/bin:$path
export classpath=.$classpath:$java_home/lib:$java_home/jre/lib:$java_home/lib/tools.jar

Create docker build shell script

[root@node2 /app/dockerfile/system/centos/jdk1.8]#vim build-command.sh 
#!/bin/bash
#
docker build -t 172.20.7.50/baseimages/centos7.5-jdk:8.162 .

Start making the image

[root@node2 /app/dockerfile/system/centos/jdk1.8]#bash build-command.sh 
  sending build context to docker daemon 189.8mb
  step 1/10 : from 172.20.7.50/baseimages/centos-base:7.5.1804
   ---> 73d683a54877
  step 2/10 : label maintainer "mr.luo <mr.luo@dklwj.com>"
   ---> running in 65604dd1f392
  removing intermediate container 65604dd1f392
   ---> c4720603ce38
  step 3/10 : add jdk-8u162-linux-x64.tar.gz /usr/local/src/
   ---> bc98adffe1b4
  step 4/10 : run ln -s /usr/local/src/jdk1.8.0_162/ /usr/local/jdk
   ---> running in df5a6f67f9fd
  removing intermediate container df5a6f67f9fd
   ---> 0ae1af0416c6
  step 5/10 : add profile /etc/profile
   ---> eee23a69c0c8
  step 6/10 : env java_home /usr/local/jdk
   ---> running in edbef8563e83
  removing intermediate container edbef8563e83
   ---> 5f783f642054
  step 7/10 : env jre_home $java_home/jre
   ---> running in fa0e5f08e732
  removing intermediate container fa0e5f08e732
   ---> 28a4d31463d4
  step 8/10 : env classpath $java_home/lib/:$jre_home/lib/
   ---> running in 3c4ebb04ac62
  removing intermediate container 3c4ebb04ac62
   ---> 245f2dd82d52
  step 9/10 : env path $path:$java_home/bin
   ---> running in 4f5e6093f0a9
  removing intermediate container 4f5e6093f0a9
   ---> 5be0e6261eea
  step 10/10 : run rm -rf /etc/localtime && ln -snf /usr/share/zoneinfo/asia/shanghai /etc/localtime && echo "asia/shanghai" > /etc/timezone
   ---> running in 52d8cb8463a8
  removing intermediate container 52d8cb8463a8
   ---> 9fb867ae8c39
  successfully built 9fb867ae8c39
  successfully tagged 172.20.7.50/baseimages/centos7.5-jdk:8.162

View the files in the current directory

[root@node2 /app/dockerfile/system/centos/jdk1.8]#ls
build-command.sh dockerfile jdk-8u162-linux-x64.tar.gz profile

Check the made image Whether it can be used normally

[root@node2 /app/dockerfile/system/centos/jdk1.8]#docker run -it --rm 172.20.7.50/baseimages/centos7.5-jdk:8.162 bash
[root@919844b164dc /]# java -version 
java version "1.8.0_162"
java(tm) se runtime environment (build 1.8.0_162-b12)
java hotspot(tm) 64-bit server vm (build 25.162-b12, mixed mode)
[root@919844b164dc /]# date
thu nov 22 21:17:49 cst 2018
[root@919844b164dc /]# exit
exit

3. Make a tomcat image

Enter the previously built /app/dockerfile/web/tomcat and create a tomcat -base directory

[root@node2 ~]# cd /app/dockerfile/web/tomcat 
[root@node2 /app/dockerfile/web/tomcat]#mkdir tomcat-base

Create dockerfile

[root@node2 /app/dockerfile/web/tomcat/tomcat-base]#vim dockerfile 
from 172.20.7.50/baseimages/centos7.5-jdk:8.162

label maintainer "mr.luo <mr.luo@dklwj.com>"

run mkdir /apps
add apache-tomcat-8.5.33.tar.gz /apps
run ln -s /apps/apache-tomcat-8.5.33 /apps/tomcat

Create docker build script

[root@node2 /app/dockerfile/web/tomcat/tomcat-base]#vim build-command.sh 
#!/bin/bash

docker build -t 172.20.7.50/baseimages/centos-tomcat:8.5.33 .

Execute to create the image file:

[root@node2 /app/dockerfile/web/tomcat/tomcat-base]#bash build-command.sh 
  sending build context to docker daemon 9.625mb
  step 1/5 : from 172.20.7.50/baseimages/centos7.5-jdk:8.162
   ---> 9fb867ae8c39
  step 2/5 : label maintainer "mr.luo <mr.luo@dklwj.com>"
   ---> running in 9ce6fc4d2850
  removing intermediate container 9ce6fc4d2850
   ---> b68755061b28
  step 3/5 : run mkdir /apps
   ---> running in b483c6b127f2
  removing intermediate container b483c6b127f2
   ---> 605c1a048a5f
  step 4/5 : add apache-tomcat-8.5.33.tar.gz /apps
   ---> 3c44f96ed41c
  step 5/5 : run ln -s /apps/apache-tomcat-8.5.33 /apps/tomcat
   ---> running in 4c1aa39a6c92
  removing intermediate container 4c1aa39a6c92
   ---> 9b3bc4f58cc9
  successfully built 9b3bc4f58cc9
  successfully tagged 172.20.7.50/baseimages/centos-tomcat:8.5.33

Use the created image to start a container Check whether it is successfully created, add -p to expose the port when starting, and test it on the physical machine

[root@node2 /app/dockerfile/web/tomcat/tomcat-base]#docker run -it -p 8802:8080 172.20.7.50/baseimages/centos-tomcat:8.5.33 bash  
[root@917b2c2262a3 /]# cd /apps/
[root@917b2c2262a3 apps]# ll
total 0
drwxr-xr-x 9 root root 220 nov 22 22:08 apache-tomcat-8.5.33
lrwxrwxrwx 1 root root 26 nov 22 22:08 tomcat -> /apps/apache-tomcat-8.5.33
[root@917b2c2262a3 apps]# ./tomcat/bin/catalina.sh start
using catalina_base:  /apps/tomcat
using catalina_home:  /apps/tomcat
using catalina_tmpdir: /apps/tomcat/temp
using jre_home:    /usr/local/jdk/jre
using classpath:    /apps/tomcat/bin/bootstrap.jar:/apps/tomcat/bin/tomcat-juli.jar
tomcat started.

Test with the browser on the client

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