运维/docker部署java应用

java应用部署

记录一下部署公司java项目的过程。顺便写了个简单脚本。

1. maven clean
2. maven package
3. 产物拷贝到服务器
4. dockerfile拷贝到服务器
5. 连接远程服务器
6. 清理原有的容器，镜像
7. 执行镜像构建命令
8. 启动容器
9. 查看日志

dockerFile

# 基础镜像
FROM docker.io/library/openjdk:8-jre-alpine@sha256:f362b165b870ef129cbe730f29065ff37399c0aa8bcab3e44b51c302938c9193
# author
MAINTAINER project

# 暴露的端口，根据您的实际项目端口进行调整
EXPOSE 9401

# 挂载目录
VOLUME /app/xxx/project
# 创建目录
RUN mkdir -p /app/xxx/project
# 指定路径
WORKDIR /app/xxx/project
# 将 jar 文件复制到容器中
COPY project.jar /app/xxx/project
# 时区
RUN ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
RUN echo 'Asia/Shanghai' >/etc/timezone

# 启动代码生成服务
ENTRYPOINT ["java", "-Xms256m", "-Xmx2048m", "-XX:MetaspaceSize=128m", "-XX:MaxMetaspaceSize=512m", "-jar", "project.jar"]

一键部署脚本

# !/bin/bash

# 打包当前的java项目
#mvn clean package

# 传递产物到远程服务器
scp target/project.jar user@remoteServer:/home/xxx/project
scp Dockerfile user@remoteServer:/home/xxx/project


# 登录远程服务器执行docker命令
ssh user@remoteServer << EOF
set -e

cd /home/xxx/project
# 停止容器
if docker ps -a --format '{{.Names}}' | grep -q "^xxx-project$"; then
  echo "Stopping container xxx-project..."
  docker stop xxx-project
  wait
  if [ $? -eq 0 ]; then
    echo "Container stopped successfully."
  else
    echo "Failed to stop container."
    exit 1
  fi
else
  echo "Container xxx-project not found, skipping stop operation."
fi

# 删除容器
if docker ps -a --format '{{.Names}}' | grep -q "^xxx-project$"; then
  echo "Removing container xxx-project..."
  docker rm xxx-project
  wait
  if [ $? -eq 0 ]; then
    echo "Container removed successfully."
  else
    echo "Failed to remove container."
    exit 1
  fi
else
  echo "Container xxx-project not found, skipping remove operation."
fi

# 删除镜像
if docker images --format '{{.Repository}}' | grep -q "^xxx-project$"; then
  echo "Removing image xxx-project..."
  docker rmi xxx-project
  wait
  if [ $? -eq 0 ]; then
    echo "Image removed successfully."
  else
    echo "Failed to remove image."
    exit 1
  fi
else
  echo "Image xxx-project not found, skipping remove operation."
fi

# 构建镜像

echo "Building image xxx-project..."
docker build -f Dockerfile -t xxx-project .
wait
if [ $? -eq 0 ]; then
  echo "Image built successfully."
else
  echo "Failed to build image."
fi

# 运行容器

echo "Running container xxx-project..."
docker run -d --name xxx-project -p 9401:9401 -v /home/xxx/project/logs:/app/xxx/project/logs --restart=always xxx-project
wait
if [ $? -eq 0 ]; then
  echo "Container started successfully."
else
  echo "Failed to start container."
fi

# 查看容器日志

echo "Showing container logs..."
docker logs -f --tail 200 xxx-project
if [ $? -eq 0 ]; then
  echo "Container logs displayed successfully."
else
  echo "Failed to display container logs."
fi

EOF

记录下遇到的小问题：
容器启动后，日志显示

no main manifest attribute, in xxx.jar
no main manifest attribute, in xxx.jar
no main manifest attribute, in xxx.jar
no main manifest attribute, in xxx.jar

解决方案：

pom中增加这个 打包插件

<build>
        <finalName>${project.artifactId}</finalName>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

好了接下来，你可能会得到另外一个错误：

org/springframework/boot/maven/RepackageMojo has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 52.0

不要慌，解决方案在这里：
指定打包插件的版本,最终如下

<build>
       <finalName>${project.artifactId}</finalName>
       <plugins>
           <plugin>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-maven-plugin</artifactId>
               <version>${spring.boot.version}</version>
               <executions>
                   <execution>
                       <goals>
                           <goal>repackage</goal>
                       </goals>
                   </execution>
               </executions>
           </plugin>
       </plugins>
   </build>