How to build a tomcat image based on Dockerfile
|
Dockerfile is a file used to build a docker image! Command parameter script! Build steps:
# Take contes as an example to view the dockerfile of contes on dockerhub FROM scratch ADD centos-7-x86_64-docker.tar.xz / LABEL \ org.label-schema.schema-version="1.0" \ org.label-schema.name="CentOS Base Image" \ org.label-schema.vendor="CentOS" \ org.label-schema.license="GPLv2" \ org.label-schema.build-date="20200809" \ org.opencontainers.image.title="CentOS Base Image" \ org.opencontainers.image.vendor="CentOS" \ org.opencontainers.image.licenses="GPL-2.0-only" \ org.opencontainers.image.created="2020-08-09 00:00:00+01:00" CMD ["/bin/bash"] DockerFile build process Basics:
Dockerfile is development-oriented. If we want to publish projects and make images in the future, we need to write a Dockerfile file. This file is very simple! Docker images are gradually becoming the standard for enterprise delivery! DockerFile: builds the image, defines all the steps and source code; DockerImages: An image generated by building a DockerFile. This image is the product we finally release and run! Docker container: A container is an image that runs to provide services! DockerFile instructions FROM # Base image MAINTAINER # Who wrote the image? Name + Email RUN # Commands to be run when building the image ADD # Steps eg: tomcat image---》Put in the compressed package of tomcat! Add contentWORKDIR # The working directory of the imageVOLUME # The mounted directory locationEXPOST # Expose port configurationCMD # Specify the command to run when this container starts. Only the last one will take effect and can be replacedENTRYPOINT # Specify the command to run when this container starts. You can append commandsONBUILD # When building an inherited DockerFile, the ONBUILD instruction will be run, triggering the instructionCOPY # Similar to ADD, copy our files to the imageENV # Set environment variables when building Field test 99% of the images in Docker Hub are based on the FROM scratch base image, and then configured with the software and configuration we need to build Create your own centos # 1. Write the DockerFile file FROM centos
# Author information MAINTAINER yinxiaodong<m15010969094@163.com>
# Configure environment variable ENV MYPATH /user/local
# Specify the working directory of the image WORKDIR $MYPATH
RUN yum install -y vim
RUN yum install -y net-tools
# Expose port 80 EXPOSE 80
CMD echo $MYPATH
CMD echo "---------end--------"
CMD /bin/bash
# 2. Build an image through files# Command docker build -f dockerfile file path -t image name: version number.
[root@localhost dockerfile]# docker build -f mydockerfile-centos -t mycentos:0.1 .
Sending build context to Docker daemon 2.048kB
Step 1/9: FROM centos
---> 0d120b6ccaa8
Step 2/9: MAINTAINER yinxiaodong<m15010969094@163.com>
---> Running in f79b12ffb083
Removing intermediate container f79b12ffb083
---> 8ee53d3f7a65
Step 3/9: ENV MYPATH /user/local
---> Running in 659a2c96d5f7
Removing intermediate container 659a2c96d5f7
---> 59ab131ef44c
Step 4/9: WORKDIR $MYPATH
---> Running in 0b4b8f9c65bb
Removing intermediate container 0b4b8f9c65bb
---> 408b06671488
Step 5/9: RUN yum install -y net-tools
---> Running in 151f81148a87
CentOS-8 - AppStream 118 kB/s | 5.8 MB 00:50
CentOS-8 - Base 218 kB/s | 2.2 MB 00:10
CentOS-8 - Extras 1.8 kB/s | 7.3 kB 00:04
Dependencies resolved.
================================================================================
Package Architecture Version Repository Size
================================================================================
Installing:
net-tools x86_64 2.0-0.51.20160912git.el8 BaseOS 323 k
Transaction Summary
================================================================================
Install 1 Package
Total download size: 323 k
Installed size: 1.0 M
Downloading Packages:
net-tools-2.0-0.51.20160912git.el8.x86_64.rpm 219 kB/s | 323 kB 00:01
--------------------------------------------------------------------------------
Total 66 kB/s | 323 kB 00:04
warning: /var/cache/dnf/BaseOS-f6a80ba95cf937f2/packages/net-tools-2.0-0.51.20160912git.el8.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID 8483c65d: NOKEY
CentOS-8 - Base 162 kB/s | 1.6 kB 00:00
Importing GPG key 0x8483C65D:
Userid : "CentOS (CentOS Official Signing Key) <security@centos.org>"
Fingerprint: 99DB 70FA E1D7 CE22 7FB6 4882 05B5 55B3 8483 C65D
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
Key imported successfully
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing: 1/1
Installing: net-tools-2.0-0.51.20160912git.el8.x86_64 1/1
Running scriptlet: net-tools-2.0-0.51.20160912git.el8.x86_64 1/1
Verifying : net-tools-2.0-0.51.20160912git.el8.x86_64 1/1
Installed:
net-tools-2.0-0.51.20160912git.el8.x86_64
Complete!
Removing intermediate container 151f81148a87
---> c0a0546c9b2a
Step 6/9: EXPOSE 80
---> Running in 42000936515d
Removing intermediate container 42000936515d
---> fe68114ecf3f
Step 7/9 : CMD echo $MYPATH
---> Running in c393fc53a354
Removing intermediate container c393fc53a354
---> a6924276bf90
Step 8/9 : CMD echo "---------end--------"
---> Running in 5994de56f0a1
Removing intermediate container 5994de56f0a1
---> a8ba0ebb3770
Step 9/9 : CMD /bin/bash
---> Running in d1fa2d436363
Removing intermediate container d1fa2d436363
---> 41bb76be4884
Successfully built 41bb76be4884
Successfully tagged mycentos:0.1
[root@localhost dockerfile]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
mycentos 0.1 41bb76be4884 7 seconds ago 246MB
centos 1.0 d840628c30a9 6 hours ago 215MB
centos latest 0d120b6ccaa8 2 days ago 215MB
# Start mycentos and use ifconfig command to view IP information [root@localhost dockerfile]# docker run -it mycentos:0.1
[root@494c2bc72263 local]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.17.0.3 netmask 255.255.0.0 broadcast 172.17.255.255
ether 02:42:ac:11:00:03 txqueuelen 0 (Ethernet)
RX packets 6 bytes 516 (516.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
loop txqueuelen 1000 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
# Check the directory /user/local which is exactly the directory we specified in dockerfile [root@494c2bc72263 local]# pwd
/user/localView the build history of an image # Command docker history image id [root@localhost ~]# docker history 41bb76be4884 IMAGE CREATED CREATED BY SIZE COMMENT 41bb76be4884 16 minutes ago /bin/sh -c #(nop) CMD ["/bin/sh" "-c" "/bin… 0B a8ba0ebb3770 16 minutes ago /bin/sh -c #(nop) CMD ["/bin/sh" "-c" "echo… 0B a6924276bf90 16 minutes ago /bin/sh -c #(nop) CMD ["/bin/sh" "-c" "echo… 0B fe68114ecf3f 16 minutes ago /bin/sh -c #(nop) EXPOSE 80 0B c0a0546c9b2a 16 minutes ago /bin/sh -c yum install -y net-tools 31.3MB 408b06671488 17 minutes ago /bin/sh -c #(nop) WORKDIR /user/local 0B 59ab131ef44c 17 minutes ago /bin/sh -c #(nop) ENV MYPATH=/user/local 0B 8ee53d3f7a65 17 minutes ago /bin/sh -c #(nop) MAINTAINER yinxiaodong<m1… 0B 0d120b6ccaa8 2 days ago /bin/sh -c #(nop) CMD ["/bin/bash"] 0B <missing> 2 days ago /bin/sh -c #(nop) LABEL org.label-schema.sc… 0B <missing> 2 days ago /bin/sh -c #(nop) ADD file:538afc0c5c964ce0d… 215MB When we get an image, we can study how it is made---->docker history image id The difference between CMD and ENTRYPOINT CMD #Specify the command to run when this container starts. Only the last one will take effect and can be replaced. ENTRYPOINT #Specify the command to run when this container starts. You can append commands. #Test CMD # Write DockerFile file [root@localhost dockerfile]# cat dockerfile-cmd-test FROM centos CMD ["ls","-a"] # Build image based on DockerFile [root@localhost dockerfile]# docker build -f dockerfile-cmd-test -t testcmd:0.1 . Sending build context to Docker daemon 3.072kB Step 1/2: FROM centos ---> 0d120b6ccaa8 Step 2/2 : CMD ["ls","-a"] ---> Running in b3f8ba72222b Removing intermediate container b3f8ba72222b ---> 561e47f88730 Successfully built 561e47f88730 Successfully tagged testcmd:0.1 # Build successfully# View the image [root@localhost dockerfile]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE testcmd 0.1 561e47f88730 6 seconds ago 215MB centos latest 0d120b6ccaa8 2 days ago 215MB # Start the image and find that the ls -a command is effective [root@localhost dockerfile]# docker run -it testcmd:0.1 . .dockerenv dev home lib64 media opt root sbin sys usr .. bin etc lib lost+found mnt proc run srv tmp var # Append a -l to the startup command. We expect ls -a -l, but an error is reported. Here, ls -a is replaced with -l. The final command is -l, so an error is reported. [root@localhost dockerfile]# docker run -it 561e47f88730 -l docker: Error response from daemon: OCI runtime create failed: container_linux.go:349: starting container process caused "exec: \"-l\": executable file not found in $PATH": unknown. # Replace the startup command with docker run -it testcmd:0.1 ls -al, and print detailed information successfully; [root@localhost dockerfile]# docker run -it testcmd:0.1 ls -al total 0 drwxr-xr-x. 1 root root 6 Aug 13 08:20 . drwxr-xr-x. 1 root root 6 Aug 13 08:20 .. -rwxr-xr-x. 1 root root 0 Aug 13 08:20 .dockerenv lrwxrwxrwx. 1 root root 7 May 11 2019 bin -> usr/bin drwxr-xr-x. 5 root root 360 Aug 13 08:20 dev drwxr-xr-x. 1 root root 66 Aug 13 08:20 etc drwxr-xr-x. 2 root root 6 May 11 2019 home lrwxrwxrwx. 1 root root 7 May 11 2019 lib -> usr/lib lrwxrwxrwx. 1 root root 9 May 11 2019 lib64 -> usr/lib64 drwx------. 2 root root 6 Aug 9 21:40 lost+found drwxr-xr-x. 2 root root 6 May 11 2019 media drwxr-xr-x. 2 root root 6 May 11 2019 mnt drwxr-xr-x. 2 root root 6 May 11 2019 opt dr-xr-xr-x. 123 root root 0 Aug 13 08:20 proc dr-xr-x---. 2 root root 162 Aug 9 21:40 root drwxr-xr-x. 11 root root 163 Aug 9 21:40 run lrwxrwxrwx. 1 root root 8 May 11 2019 sbin -> usr/sbin drwxr-xr-x. 2 root root 6 May 11 2019 srv dr-xr-xr-x. 13 root root 0 Aug 11 09:58 sys drwxrwxrwt. 7 root root 145 Aug 9 21:40 tmp drwxr-xr-x. 12 root root 144 Aug 9 21:40 usr drwxr-xr-x. 20 root root 262 Aug 9 21:40 var # Test 2: Now we replace CMD in DockerFile with ENTRYPOINT and rebuild it, and run it to see the result [root@localhost dockerfile]# cat dockerfile-cmd-test FROM centos ENTRYPOINT ["ls","-a"] # Rebuild the image [root@localhost dockerfile]# docker build -f dockerfile-cmd-test -t testcmd:0.2 . Sending build context to Docker daemon 3.072kB Step 1/2: FROM centos ---> 0d120b6ccaa8 Step 2/2: ENTRYPOINT ["ls","-a"] ---> Running in c634ca09fabe Removing intermediate container c634ca09fabe ---> 52d295395f08 Successfully built 52d295395f08 Successfully tagged testcmd:0.2 # View the image [root@localhost dockerfile]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE testcmd 0.2 52d295395f08 7 seconds ago 215MB testcmd 0.1 561e47f88730 12 minutes ago 215MB centos latest 0d120b6ccaa8 2 days ago 215MB # Run testcmd:0.2 image and append -l, and find that detailed information is printed [root@localhost dockerfile]# docker run -it testcmd:0.2 -l total 0 drwxr-xr-x. 1 root root 6 Aug 13 08:17 . drwxr-xr-x. 1 root root 6 Aug 13 08:17 .. -rwxr-xr-x. 1 root root 0 Aug 13 08:17 .dockerenv lrwxrwxrwx. 1 root root 7 May 11 2019 bin -> usr/bin drwxr-xr-x. 5 root root 360 Aug 13 08:17 dev drwxr-xr-x. 1 root root 66 Aug 13 08:17 etc drwxr-xr-x. 2 root root 6 May 11 2019 home lrwxrwxrwx. 1 root root 7 May 11 2019 lib -> usr/lib lrwxrwxrwx. 1 root root 9 May 11 2019 lib64 -> usr/lib64 drwx------. 2 root root 6 Aug 9 21:40 lost+found drwxr-xr-x. 2 root root 6 May 11 2019 media drwxr-xr-x. 2 root root 6 May 11 2019 mnt drwxr-xr-x. 2 root root 6 May 11 2019 opt dr-xr-xr-x. 121 root root 0 Aug 13 08:17 proc dr-xr-x---. 2 root root 162 Aug 9 21:40 root drwxr-xr-x. 11 root root 163 Aug 9 21:40 run lrwxrwxrwx. 1 root root 8 May 11 2019 sbin -> usr/sbin drwxr-xr-x. 2 root root 6 May 11 2019 srv dr-xr-xr-x. 13 root root 0 Aug 11 09:58 sys drwxrwxrwt. 7 root root 145 Aug 9 21:40 tmp drwxr-xr-x. 12 root root 144 Aug 9 21:40 usr drwxr-xr-x. 20 root root 262 Aug 9 21:40 var Many commands in DockerFile are very similar. We need to understand their differences. The best way to learn is to compare and test them to see the results! Actual combat: Tomcat image 1. Prepare the image file tomcat compressed package jdk compressed package
2. Write the Dockerfile file, officially named Dockerfile, build will automatically find this file, no -f specification is required! # Import the basic FROM centos # Author information MAINTAINER yinxiaodoong<m15010969094@163.com> # copy the file read.txt to the /usr/local/read.txt directory of the container COPY read.txt /usr/local/read.txt # Add jdk tomcat ---> Automatically decompress ADD jdk-8u211-linux-x64.tar.gz /usr/local/ ADD apache-tomcat-8.5.43.tar.gz /usr/local/ # Install vim command RUN yum install -y vim #Configure MYPATH ENV MYPATH /usr/local/ #Specify the default path to enter the container /user/local/ WORKDIR $MYPATH # Configure the jdk environment variable ENV JAVA_HOME /usr/local/jdk1.8.0_211 ENV CLASSPATH $JAVA_HOME/lib/dt.jat:$JAVA_HOME/lib/tools.jar # Configure the tomcat environment variable ENV CATALINA_HOME /usr/local/apache-tomcat-8.5.43 ENV CATALINA_BASH /usr/local/apache-tomcat-8.5.43 ENV PATH $PATH:$JAVA_HOME/bin:$CATALINA_HOME/lib:$CATALINA_HOME/bin # Expose port 8080 EXPOSE 8080 # /usr/local/tomcat/webapps# # Start tomcat when starting the container CMD /usr/local/apache-tomcat-8.5.43/bin/startup.sh && tail -f /usr/local/apache-tomcat-8.5.43/logs/catalina.out # Build tomcat image [root@localhost tomcat]# docker build -t mytomcat [root@localhost tomcat]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE mytomcat latest a9707559afa1 8 seconds ago 693MB centos latest 0d120b6ccaa8 4 days ago 215MB [root@localhost tomcat]# docker run -d -p 8081:8080 --name mytomcat--01 -v /home/yinxiaodong/build/tomcat/test:/usr/local/apache-tomcat-8.5.43/webapps/test -v /home/yinxiaodong/build/tomcat/logs:/usr/local/apache-tomcat-8.5.43/logs mytomcat Publish your own image Publish to DockerHub Address: https://hub.docker.com/ Register your own account Make sure your account can log in Submit on our server [root@localhost logs]# docker login --help Usage: docker login [OPTIONS] [SERVER] Log in to a Docker registry. If no server is specified, the default is defined by the daemon. Options: -p, --password string Password --password-stdin Take the password from stdin -u, --username string Username [root@localhost logs]# [root@localhost logs]# docker login -u xxx -p xxx WARNING! Using --password via the CLI is insecure. Use --password-stdin. WARNING! Your password will be stored unencrypted in /root/.docker/config.json. Configure a credential helper to remove this warning. See https://docs.docker.com/engine/reference/commandline/login/#credentials-store Login Succeeded After logging in, you can submit the image. The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM. You may also be interested in:
|
<<: Solution to running out of MySQL's auto-increment ID (primary key)
>>: Native js implements shopping cart logic and functions
Recommend
Four modes of Oracle opening and closing
>1 Start the database In the cmd command windo...
Linux debugging tools that developers and operators must look at [Recommended]
System performance expert Brendan D. Gregg update...
Several ways of running in the background of Linux (summary)
1. nohup Run the program in a way that ignores th...
Border-radius IE8 compatible processing method
According to canisue (http://caniuse.com/#search=...
How to load third-party component libraries on demand in Vue3
Preface Take Element Plus as an example to config...
MySQL uses covering index to avoid table return and optimize query
Preface Before talking about covering index, we m...
Will this SQL writing method really cause the index to fail?
Preface There are often some articles on the Inte...
In IIS 7.5, HTML supports the include function like SHTML (add module mapping)
When I first started, I found a lot of errors. In...
Detailed explanation of the difference between MySQL null and not null and null and empty value ''''
I believe that many people who have used MySQL fo...
React Hooks Detailed Explanation
Table of contents What are hooks? Class Component...
Understanding of haslaylout and bfc parsing
1. haslayout and bfc are IE-specific and standard ...
Two simple ways to remove text watermarks from web pages
<br /> When we browse certain websites and s...
WeChat applet custom tabBar step record
Table of contents 1. Introduction 2. Customize ta...
A brief discussion on JavaScript scope
Table of contents 1. Scope 1. Global scope 2. Loc...
Explanation of the precautions for Mysql master-slave replication
1. Error error connecting to master 'x@xxxx:x...