准备镜像
Dockerfile
FROM alpine:latest
RUN apk update
RUN apk --no-cache add curl
ENV SUPERCRONIC_URL=https://github.com/aptible/supercronic/releases/download/v0.1.12/supercronic-linux-amd64 \
SUPERCRONIC=supercronic-linux-amd64 \
SUPERCRONIC_SHA1SUM=048b95b48b708983effb2e5c935a1ef8483d9e3e
RUN curl -fsSLO "$SUPERCRONIC_URL" \
&& echo "${SUPERCRONIC_SHA1SUM} ${SUPERCRONIC}" | sha1sum -c - \
&& chmod +x "$SUPERCRONIC" \
&& mv "$SUPERCRONIC" "/usr/local/bin/${SUPERCRONIC}" \
&& ln -s "/usr/local/bin/${SUPERCRONIC}" /usr/local/bin/supercronic
COPY my-cron /app/my-cron
WORKDIR /app
VOLUME ["/app"]
# RUN cron job
CMD ["/usr/local/bin/supercronic", "/app/my-cron"]
my-cron
*/1 * * * * date >> /app/test.txt
构建镜像
docker image build -t my-cron .
docker image ls
创建容器
不指定-v参数
此时Docker会自动创建一个随机名字的volume,去存储我们在Dockerfile定义的volume
docker run -d my-cron
docker volume ls
docker volume inspect 043a196c21202c484c69f2098b6b9ec22b9a9e4e4bb8d4f55a4c3dce13c15264
创建容器(指定-v参数)
在创建容器的时候通过 -v 参数我们可以手动的指定需要创建Volume的名字,以及对应于容器内的路径,这个路径是可以任意的,不必需要在Dockerfile里通过VOLUME定义
比如我们把上面的Dockerfile里的VOLUME删除
FROM alpine:latest
RUN apk update
RUN apk --no-cache add curl
ENV SUPERCRONIC_URL=https://github.com/aptible/supercronic/releases/download/v0.1.12/supercronic-linux-amd64 \
SUPERCRONIC=supercronic-linux-amd64 \
SUPERCRONIC_SHA1SUM=048b95b48b708983effb2e5c935a1ef8483d9e3e
RUN curl -fsSLO "$SUPERCRONIC_URL" \
&& echo "${SUPERCRONIC_SHA1SUM} ${SUPERCRONIC}" | sha1sum -c - \
&& chmod +x "$SUPERCRONIC" \
&& mv "$SUPERCRONIC" "/usr/local/bin/${SUPERCRONIC}" \
&& ln -s "/usr/local/bin/${SUPERCRONIC}" /usr/local/bin/supercronic
COPY my-cron /app/my-cron
WORKDIR /app
# RUN cron job
CMD ["/usr/local/bin/supercronic", "/app/my-cron"]
重新build镜像,然后创建容器,加-v参数
docker image build -t my-cron .
docker container run -d -v cron-data:/app my-cron
docker volume ls
docker volume inspect cron-data
ls /var/lib/docker/volumes/cron-data/_data
Volume也创建了