docker(常见调试技巧)：docker打包镜像调试技巧 exec user process caused "no such file or director

写Dockerfile可以先不指定CMD、ENTRYPOINT等启动命令，只要拷贝就好了

如下：

# Dockerfile for basic-app-client
# Build with:
# docker build -t basic-app-client:1.2.2-jdk7 .
# Run with:
# docker run -di --name basic-app-client basic-std-etl-client:1.2.2-jdk7


FROM openjdk:7-jre-alpine
MAINTAINER haokailin <[email protected]>

ENV VERSION 1.2.2

RUN \
    echo "http://mirrors.aliyun.com/alpine/v3.8/main" > /etc/apk/repositories && \
    echo "http://mirrors.aliyun.com/alpine/v3.8/community" >> /etc/apk/repositories  && \
    apk update upgrade && \
    apk add --no-cache procps curl bash && \
    ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && \
    echo "Asia/Shanghai" > /etc/timezone

ADD app /usr/mpsp/app

#CMD ["/usr/mpsp/app/script/serv.sh","console"]

先注释掉CMD启动命令，打包镜像app，然后用sh命令启动并进入容器，

docker run -ti   basic-app-client:1.2.2.2-jdk7 sh

# 进入容器后，再执行启动脚本，调试。

进入容器后，再启动应用的启动脚本，调试即可。

非常适用于docker log日志查看报错信息 不明确的情况，

如  exec user process caused "no such file or directory,这种报错。