一：开启docker远程访问功能
主要就是修改ExecStart的配置为ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock -H tcp://0.0.0.0:2375
[root@localhost ~]# cat /lib/systemd/system/docker.service
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service containerd.service
Wants=network-online.target
Requires=docker.socket containerd.service
[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
# ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock -H tcp://0.0.0.0:2375
ExecReload=/bin/kill -s HUP $MAINPID
TimeoutSec=0
RestartSec=2
Restart=always
# Note that StartLimit* options were moved from "Service" to "Unit" in systemd 229.
# Both the old, and new location are accepted by systemd 229 and up, so using the old location
# to make them work for either version of systemd.
StartLimitBurst=3
# Note that StartLimitInterval was renamed to StartLimitIntervalSec in systemd 230.
# Both the old, and new name are accepted by systemd 230 and up, so using the old name to make
# this option work for either version of systemd.
StartLimitInterval=60s
# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
# Comment TasksMax if your systemd version does not support it.
# Only systemd 226 and above support this option.
TasksMax=infinity
# set delegate yes so that systemd does not reset the cgroups of docker containers
Delegate=yes
# kill only the docker process, not all processes in the cgroup
KillMode=process
OOMScoreAdjust=-500
[Install]
WantedBy=multi-user.target
二：重新加载配置文件并重启docker
[root@localhost ~]# systemctl daemon-reload
[root@localhost ~]#
[root@localhost ~]# systemctl restart docker.service
[root@localhost ~]#
再次确认我们刚刚修改的ExecStart的2375端口有没有打开，发现已经打开了！
[root@localhost ~]# netstat -nlpt
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1106/master
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1019/sshd
tcp6 0 0 ::1:25 :::* LISTEN 1106/master
tcp6 0 0 :::2375 :::* LISTEN 6292/dockerd
tcp6 0 0 :::22 :::* LISTEN 1019/sshd
[root@localhost ~]#
三：idea使用docker
3.1下载docker插件
3.2测试连接
初步猜测是由于服务器防火墙未关闭的原因，登上服务器查看，果然防火墙是开着的
3.3关闭防火墙
systemctl stop firewalld
上面的命令只是在当前会话关闭防火墙，如果服务器重启，那么防火墙又会自动打开，所以为了测试方便，我们需要永久关闭防火墙，参考命令如下：
sudo systemctl disable firewalld
3.4重新测试连接
发现已经连接成功了
可以看到当前连接的docker里面所有的容器和镜像了
关于容器和镜像的基本操作基本上都可以在这里完成，比如镜像的拉取，推送，容器的创建，停止以及删除等。就不需要再登陆服务器才能操作了
四：使用docker部署springboot项目
4.1打包springboot项目
4.2编写dockerfile文件
4.3将jar包和dockerfile文件上传
4.4构建镜像
[root@localhost idea]# docker build -f Dockerfile -t app.jar:1.0 .
Sending build context to Docker daemon 17.35MB
Step 1/5 : FROM java:8
---> d23bdf5b1b1b
Step 2/5 : COPY *.jar /app.jar
---> 7453043a17c9
Step 3/5 : CMD ["--server.port=8080"]
---> Running in 7020002a89c3
Removing intermediate container 7020002a89c3
---> 0ace1426ab4e
Step 4/5 : EXPOSE 8080
---> Running in 80e97859a1de
Removing intermediate container 80e97859a1de
---> 3df752334d1a
Step 5/5 : ENTRYPOINT ["java","-jar","app.jar"]
---> Running in 7794a2b1acc8
Removing intermediate container 7794a2b1acc8
---> f116ab0e5883
Successfully built f116ab0e5883
Successfully tagged app.jar:1.0
4.5启动容器
[root@localhost idea]# docker run -d --name app app.jar:1.0
c64f1d1436e47b971cd3cd8b01af1d3168d5e2425612c09a7ab0c6da1cfd12e7
4.6访问测试
[root@localhost idea]# curl 172.17.0.2:8080
{"timestamp":"2021-09-15T06:42:32.020+00:00","status":404,"error":"Not Found","path":"/"}[root@localhost idea]#
[root@localhost idea]# curl 172.17.0.2:8080/hello
Hello,Wolrd![root@localhost idea]# ls
总结：到此我们结合idea使用dockerfile部署一个springboot项目就测试完成了
五：一键部署springboot
5.1配置pom文件
<properties>
<java.version>1.8</java.version>
<docker.image.prefix>jinlong</docker.image.prefix>
</properties>
<plugin>
<groupId>com.spotify</groupId>
<artifactId>docker-maven-plugin</artifactId>
<version>1.2.0</version>
<configuration>
<imageName>${docker.image.prefix}/${project.artifactId}:${project.version}</imageName>
<dockerHost>http://192.168.188.129:2375</dockerHost>
<dockerDirectory>${project.basedir}/src/main/docker</dockerDirectory>
<resources>
<resource>
<targetPath>/</targetPath>
<directory>${project.build.directory}</directory>
<include>${project.build.finalName}.jar</include>
</resource>
</resources>
</configuration>
</plugin>
5.2编写dockerfile文件
FROM java:8
VOLUME /tmp
ADD dockerspringboottest-0.0.1-SNAPSHOT.jar app1.jar
ENTRYPOINT ["java","-jar","/app1.jar"]
5.3执行build命令
mvn package docker:build
5.4查看镜像
发现使用idea已经成功build了一个镜像了
