创建eureka-server项目
主要看下配置文件
server:
port: 8765
# 开启优雅停机kill -2 可以优雅停机
shutdown: GRACEFUL
eureka:
#此处设置会改变eureka控制台System Status的显示
datacenter: cloud
#此处设置会改变eureka控制台System Status的显示
environment: dev
instance:
appname: eureka-server
lease-renewal-interval-in-seconds: 5 # 设置心跳的时间间隔(默认是30秒)
lease-expiration-duration-in-seconds: 5 #如果现在超过了5秒的间隔(默认是90秒
instance-id: ${spring.cloud.client.ip-address}:${server.port} # 在eureka中显示ip和端口
prefer-ip-address: true # 访问的路径变为 IP 地址
hostname: 127.0.0.1
client:
fetch-registry: true # 不通过eureka获取注册信息
register-with-eureka: true # 不注册该服务到eureka上
service-url:
# 默认向 http://localhost:8761/eureka 发发请求 EurekaClientConfigBean中
# defaultZone: http://${spring.cloud.client.ip-address}:${server.port}/eureka/
defaultZone: http://127.0.0.1:${server.port}/eureka/
server:
eviction-interval-timer-in-ms: 10000 #及时踢出已关停的节点,间隔时间
enable-self-preservation: false # 关闭自我保护机制
具体查看:https://github.com/yxkong/ddd-framework/tree/main/ddd-parent/eureka-server
编写Dockerfile文件
参考了nacos
在根目录下创建Dockerfile
FROM centos:7.5.1804
MAINTAINER pader "5ycode@sina.com"
# set environment
ENV BASE_DIR="/home/appuser" \
CLASSPATH=".:/home/appuser/conf:$CLASSPATH" \
JAVA_HOME="/usr/lib/jvm/java-1.8.0-openjdk" \
USER="appuser" \
JAVA="/usr/lib/jvm/java-1.8.0-openjdk/bin/java" \
JVM_XMS="256m" \
JVM_XMX="256m" \
JVM_XMN="78m" \
JVM_MS="128m" \
JVM_MMS="256m" \
REMOTE_DEBUG="n" \
TOMCAT_ACCESSLOG_ENABLED="false" \
APPNAME="eureka-server" \
PORT=8765 \
TIME_ZONE="Asia/Shanghai"
ARG EUREKA_VERSION=0.1
ARG HOT_FIX_FLAG=""
WORKDIR $BASE_DIR
RUN set -x \
# && yum update -y \
&& yum install -y java-1.8.0-openjdk java-1.8.0-openjdk-devel
# libcurl nc iputils wget vim
# RUN wget https://maven.aliyun.com/nexus/content/groups/public/com/yxkong/eureka-server/${EUREKA_VERSION}/eureka-server-${EUREKA_VERSION}.jar -P /home/appuser
# 修改远程下载为本地下载
ADD target/eureka-server.jar /home/appuser/
# RUN yum autoremove -y wget \
RUN ln -snf /usr/share/zoneinfo/$TIME_ZONE /etc/localtime && echo $TIME_ZONE > /etc/timezone \
&& yum clean all
ADD bin/docker-startup.sh bin/docker-startup.sh
# set startup log dir
RUN mkdir -p logs \
&& cd logs \
&& touch start.out \
&& ln -sf /dev/stdout start.out \
&& ln -sf /dev/stderr start.out
RUN chmod +x bin/docker-startup.sh
EXPOSE 8848
ENTRYPOINT ["bin/docker-startup.sh"]
在根目录下创建bin/docker-startup.sh
#!/bin/bash
set -x
export CUSTOM_SEARCH_LOCATIONS=file:${BASE_DIR}/conf/
#===========================================================================================
# JVM Configuration
#===========================================================================================
JAVA_OPT="${JAVA_OPT} -server -Xms${JVM_XMS} -Xmx${JVM_XMX} -Xmn${JVM_XMN} -XX:MetaspaceSize=${JVM_MS} -XX:MaxMetaspaceSize=${JVM_MMS}"
if [[ "${REMOTE_DEBUG}" == "y" ]]; then
JAVA_OPT="${JAVA_OPT} -Xdebug -Xrunjdwp:transport=dt_socket,address=9555,server=y,suspend=n"
fi
JAVA_OPT="${JAVA_OPT} -XX:-OmitStackTraceInFastThrow -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=${BASE_DIR}/logs/java_heapdump.hprof"
JAVA_OPT="${JAVA_OPT} -XX:-UseLargePages"
#===========================================================================================
# Setting system properties,覆盖配置文件的中的系统属性
#===========================================================================================
if [[ ! -z "${APPNAME}" ]]; then
JAVA_OPT="${JAVA_OPT} -Deureka.instance.appname=${APPNAME}"
fi
if [[ ! -z "${PORT}" ]]; then
JAVA_OPT="${JAVA_OPT} -Dserver.port=${PORT}"
fi
JAVA_MAJOR_VERSION=$($JAVA -version 2>&1 | sed -E -n 's/.* version "([0-9]*).*$/\1/p')
if [[ "$JAVA_MAJOR_VERSION" -ge "9" ]]; then
JAVA_OPT="${JAVA_OPT} -Xlog:gc*:file=${BASE_DIR}/logs/nacos_gc.log:time,tags:filecount=10,filesize=102400"
else
JAVA_OPT="${JAVA_OPT} -Xloggc:${BASE_DIR}/logs/gc.log -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=100M"
fi
JAVA_OPT="${JAVA_OPT} -jar ${BASE_DIR}/eureka-server.jar"
# 自定义配置文件,从外面加载配置文件
#JAVA_OPT="${JAVA_OPT} --spring.config.additional-location=${CUSTOM_SEARCH_LOCATIONS}"
JAVA_OPT="${JAVA_OPT} --spring.config.name=${CUSTOM_SEARCH_NAMES}"
JAVA_OPT="${JAVA_OPT} --server.max-http-header-size=524288"
echo "eureka is starting, you can docker logs your container"
exec $JAVA ${JAVA_OPT}
构建镜像并启动容器
# 构建
docker build -t 5ycode/eureka:0.1 .
# 运行容器
docker run -d --name eureka-server -p 8765:8765 5ycode/eureka:0.1
添加到docker-compose中
eureka-server:
image: 5ycode/eureka:0.1
container_name: eureka-server_dev
restart: always
environment: # 可以配置自定义的变量
- "/etc/localtime:/etc/localtime"
- JVM_XMS=312m
- JVM_XMX=312m
- REMOTE_DEBUG=y
ports:
- "8765:8765"
volumes:
- ./logs/eureka-server:/logs
Dockerfile指令说明
-
&& 符号连接命令,执行结束只会创建一层镜像,否则一个RUN一层
-
FROM 定制的镜像是基于from的镜像
-
RUN 执行后面跟着的命令
-
COPY 复制指令,从上下文目录中复制文件或目录到容器里指定位置
-
ADD 和copy类似
-
优点:在copy为 tar、gzip、bip2、xz的情况下会自动复制并解压到目标领
-
缺点:无法复制tar压缩文件
-
CMD 类似于RUN指令,用于运行程序
-
CMD在 docker run时运行
-
RUN在docker build时运行
-
ENV 定义环境变量,在后续可以用这些环境变量 ${变量名}
-
ARG 与ENV作用一致,ARG 仅对Dockerfile内有效
-
VOLUME 定义匿名数据券,在启动容器时忘记挂载数据卷,会自动挂载到匿名卷
-
EXPOSE 声明端口
-
WORKDIR 指定工作目录
-
USER 用于指定执行后续命令的用户和用户组(用户和用户组必须提前存在)
-
HEALTHCHECK 用于指定某个程序或者指令来监控 docker 容器服务的运行状态。
-
ONBUILD 用于延迟构建命令的执行
-
LABEL 用于给镜像添加一些元数据