dockerfile报错/bash/sh:Failded command not found

踩坑记录

自作编译安装的nginx镜像时，出现报错信息。

• dockerfile制作镜像时总是报错yum not found

出错的dockerfile文件如下

FROM centos
#这里覆盖了centos镜像中的环境变量PATH，导致命令无法找到
ENV PATH /usr/local/nginx/sbin

RUN yum install -y pcre-devel zlib-devel make gcc gcc-c++ openssl-devel \
	&& cd /root \
	&& curl -O http://mirrors.sohu.com/nginx/nginx-1.19.2.tar.gz \
	&& tar -xf nginx-1.19.2.tar.gz \
	&& cd nginx-1.19.2 \
	&& ./configure --prefix=/usr/local/nginx --with-http_realip_module --with-http_ssl_module --with-stream \
	&& make \
	&& make install
WORKDIR $PATH
EXPOSE 80
#这里的CMD命令可能被启动镜像时的参数覆盖，导致镜像启动而没有前台进程，从而导致容器自动关闭
CMD ["$PATH/nginx"]

修正后的dockerfile文件

FROM centos

RUN yum install -y pcre-devel zlib-devel make gcc gcc-c++ openssl-devel \
	&& cd /root \
	&& curl -O http://mirrors.sohu.com/nginx/nginx-1.19.2.tar.gz \
	&& tar -xf nginx-1.19.2.tar.gz \
	&& cd nginx-1.19.2 \
	&& ./configure --prefix=/usr/local/nginx --with-http_realip_module --with-http_ssl_module --with-stream \
	&& make \
	&& make install
ENV MYPATH /usr/local/nginx/sbin
WORKDIR $MYPATH
EXPOSE 80
# 保证nginx运行在前台，避免闪退
CMD ["nginx", "-g", "daemon off;"]