dockerfile

dockerfile构建过程

基础知识
1.每个保留关键字（指令）都必须时大写字母
2.执行顺序从上到下
3.#表示注释
4.每个指令都会创建提交一个新的镜像层，并提交

dockerfile:构建文件，定义了一切的步骤，源代码
dockerImages:通过Dockerfile构建生成的镜像，最终发布和运行的产品
docker容器：容器就是镜像运行起来提供服务

dockerfile指令说明

FROM                        #基础镜像，一切从这里开始构建
MAINTAINER                  #镜像是谁写的，姓名+邮箱
RUN                         #镜像构建的时候需要运行的命令
ADD                         #步骤：tomcat镜像，这个tomcat压缩包，添加内容
WORKDIR                     #镜像的工作目录
WOLUME                      #挂载的目录
EXPOSE                      #保留端口配置
CMD                         #指定这个容器启动的时候要运行的命令，只有最后一个会生效，可被替代
ENTRYPOINT                  #指定这个容器启动的时候要运行的命令，可以追加命令
ONBUILD                     #当构建一个被继承Dockerfile这个时候机会运行ONBUILD的指令，触发指令
COPY                        #类似ADD，将我们文件拷贝到镜像中
ENV                         #构建的时候设置环境变量

部署tomcat

1.编写dockerfile

FROM centos
MAINTAINER tester

COPY readme.txt /usr/local/readme.txt

ADD apache-tomcat-9.0.59.tar.gz /usr/local/
ADD jdk-8u311-linux-x64.tar.gz /usr/local/

RUN yum -y install vim

ENV MYPATH /usr/local
WORKDIR $MYPATH

ENV JAVA_HOME /usr/local/jdk1.8.0_311
ENV CLASSPATH $JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools/jar
ENV CATALINA_HOME /usr/local/apache-tomcat-9.0.59
ENV CATALINA_BASH /usr/local/apache-tomcat-9.0.59
ENV PATH $PATH:$JAVA_HOME/bin:$CATALINA_HOME/lib:$CATALINA_HOME/bin

EXPOSE 8080

CMD /usr/local/apache-tomcat-9.0.59/bin/startup.sh && tail -F /usr/local/apache-tomcat-9.0.59/bin/logs/
catalina.out

2.build dockerfile 生成镜像文件

[root@VM-16-17-centos dockerfile]# docker build -t mytomcat .
Sending build context to Docker daemon  158.3MB
Step 1/14 : FROM centos
 ---> 5d0da3dc9764
Step 2/14 : MAINTAINER tester
 ---> Using cache
 ---> 2b108a564fd2
Step 3/14 : COPY readme.txt /usr/local/readme.txt
 ---> Using cache
 ---> 483d362cb89a
Step 4/14 : ADD apache-tomcat-9.0.59.tar.gz /usr/local/
 ---> Using cache
 ---> e85a14874d5b
Step 5/14 : ADD jdk-8u311-linux-x64.tar.gz /usr/local/
 ---> Using cache
 ---> 56570e06cbbb
Step 6/14 : ENV MYPATH /usr/local
 ---> Running in 9cbe5b2c5c9d
Removing intermediate container 9cbe5b2c5c9d
 ---> e66550f9e219
Step 7/14 : WORKDIR $MYPATH
 ---> Running in 502b08a9f5a7
Removing intermediate container 502b08a9f5a7
 ---> e5d2fb7d50b0
Step 8/14 : ENV JAVA_HOME /usr/local/jdk1.8.0_311
 ---> Running in 5b30430a46fe
Removing intermediate container 5b30430a46fe
 ---> b299065bb3b9
Step 9/14 : ENV CLASSPATH $JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools/jar
 ---> Running in 6c84204cf377
Removing intermediate container 6c84204cf377
 ---> d5d2bf27e5fc
Step 10/14 : ENV CATALINA_HOME /usr/local/apache-tomcat-9.0.59
 ---> Running in 4115f7232a40
Removing intermediate container 4115f7232a40
 ---> 33476a575b69
Step 11/14 : ENV CATALINA_BASH /usr/local/apache-tomcat-9.0.59
 ---> Running in f6d11ed1dc6a
Removing intermediate container f6d11ed1dc6a
 ---> 1119d7b9d8a4
Step 12/14 : ENV PATH $PATH:$JAVA_HOME/bin:$CATALINA_HOME/lib:$CATALINA_HOME/bin
 ---> Running in 68a009e9513c
Removing intermediate container 68a009e9513c
 ---> b19944911698
Step 13/14 : EXPOSE 8080
 ---> Running in 11900d79daa5
Removing intermediate container 11900d79daa5
 ---> 4ffd1a974d71
Step 14/14 : CMD /usr/local/apache-tomcat-9.0.59/bin/startup.sh && tail -F /usr/local/apache-tomcat-9.0.59/bin/logs/catalina.out
 ---> Running in bf46fef82d41
Removing intermediate container bf46fef82d41
 ---> f91c681d5c28
Successfully built f91c681d5c28
Successfully tagged mytomcat:latest

3.启动容器并进入

[root@VM-16-17-centos dockerfile]# docker run -d -p 9090:8080 --name szhtomcat -v /home/dockerfile/build/tomcat/test:/usr/local/apache-tomcat-9.0.59/webapps/test -v /home/dockerfile/build/tomcat/tomcatlogs/:/usr/local/apache-tomcat-9.0.59/logs mytomcat

[root@VM-16-17-centos tomcat]# docker exec -it e9a20b014132 /bin/bash
[root@e9a20b014132 local]#