Loading... 早上，同事发来一个消息“容器镜像帮忙看下把这个包装一下，不然没法用jmap看java进程具体的内存使用情况”[链接][1]。近期，微服务中的长连接服务由于内存溢出，十分吃资源。而研发排查java内存溢出需要jmap软件，且需要debug的包。 经过几经周折，发现了安装java及相关附件的方法。 安装java * 基于centos7.9系统，可以直接`yum install -y java-1.8.0-openjdk` * 如果使用jmap，需要安装`yum install -y java-1.8.0-openjdk-devel` * 而使用jmap -heap ，需要`yum --enablerepo=*debug* install -y java-1.8.0-openjdk-debuginfo` 使用效果是这样的 ``` sh-4.2# jmap -heap 7 Attaching to process ID 7, please wait... Debugger attached successfully. Server compiler detected. JVM version is 25.392-b08 using thread-local object allocation. Parallel GC with 4 thread(s) Heap Configuration: MinHeapFreeRatio = 0 MaxHeapFreeRatio = 100 MaxHeapSize = 2147483648 (2048.0MB) NewSize = 715653120 (682.5MB) MaxNewSize = 715653120 (682.5MB) OldSize = 1431830528 (1365.5MB) NewRatio = 2 SurvivorRatio = 8 MetaspaceSize = 134217728 (128.0MB) CompressedClassSpaceSize = 778043392 (742.0MB) MaxMetaspaceSize = 786432000 (750.0MB) G1HeapRegionSize = 0 (0.0MB) Heap Usage: PS Young Generation Eden Space: capacity = 348651520 (332.5MB) used = 290366624 (276.9151916503906MB) free = 58284896 (55.584808349609375MB) 83.28276440613251% used From Space: capacity = 178257920 (170.0MB) used = 15302688 (14.593780517578125MB) free = 162955232 (155.40621948242188MB) 8.584576775045957% used To Space: capacity = 167772160 (160.0MB) used = 0 (0.0MB) free = 167772160 (160.0MB) 0.0% used PS Old Generation capacity = 1431830528 (1365.5MB) used = 490085312 (467.38177490234375MB) free = 941745216 (898.1182250976562MB) 34.22788538281536% used 15028 interned Strings occupying 1331304 bytes. sh-4.2# ``` 本以为这样就完了，没想到打印的日志是“问号？”。又是几经周折，找到了方法，而且是适用于springboot架构的。 ``` RUN yum install kde-l10n-Chinese -y RUN yum install glibc-common -y RUN localedef -c -f UTF-8 -i zh_CN zh_CN.utf8 RUN export LANG=zh_CN.UTF-8 RUN echo "export LANG=zh_CN.UTF-8" >> /etc/locale.conf ENV LANG zh_CN.UTF-8 ENV LC_ALL zh_CN.UTF-8 ``` 最终使用到的Dockerfile如下 * 基础镜像 ``` FROM centos:7.9.2009 # 基础配置，包括中文环境、时区等 RUN yum install kde-l10n-Chinese -y RUN yum install glibc-common -y RUN localedef -c -f UTF-8 -i zh_CN zh_CN.utf8 RUN export LANG=zh_CN.UTF-8 RUN echo "export LANG=zh_CN.UTF-8" >> /etc/locale.conf ENV LANG zh_CN.UTF-8 ENV LC_ALL zh_CN.UTF-8 RUN ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && echo "Asia/Shanghai" > /etc/timezone # 修改镜像源 RUN rm -rvf /etc/yum.repos.d/* ADD https://d.op123.ren/d/soft/centos/CentOS-Base.repo /etc/yum.repos.d/ ADD https://d.op123.ren/d/soft/centos/epel.repo /etc/yum.repos.d/ # 安装基础软件 RUN yum install -y vi openssh-clients tar gzip curl wget telnet rsync iftop iproute dstat sysstat lrzsz net-tools traceroute tcpdump tshark bind-utils ADD https://d.op123.ren/d/soft/trzsz/centos/trzsz_with_rzsz /bin/trzsz ADD https://d.op123.ren/d/soft/trzsz/centos/trz_with_rzsz /bin/trz ADD https://d.op123.ren/d/soft/trzsz/centos/tssh_with_rzsz /bin/tssh ADD https://d.op123.ren/d/soft/trzsz/centos/tsz_with_rzsz /bin/tsz RUN chmod a+x /bin/* # 清理缓存文件 RUN yum clean all ; rm -rvf /var/cache/yum/* # 启动命令 CMD ["/bin/bash"] ``` * java镜像 ``` # 依托镜像 FROM harbor.test.stesh.cn/op123/centos7.9.2009:cn20231208 # 安装jdk RUN yum install -y java-1.8.0-openjdk java-1.8.0-openjdk-devel ADD https://d.op123.ren/d/soft/centos/CentOS-Debuginfo.repo /etc/yum.repos.d/ RUN yum --enablerepo=*debug* install -y java-1.8.0-openjdk-debuginfo ENV JAVA_HOME /usr/lib/jvm/jre-1.8.0-openjdk ENV PATH $JAVA_HOME/bin:$PATH # 清理 RUN yum clean all ; rm -rvf /var/cache/yum/* ``` [1]: https://codeleading.com/article/32793162427/ 最后修改：2024 年 05 月 11 日 © 允许规范转载 赞 如果觉得我的文章对你有用，请随意赞赏