我有我的 Dockerfile,它看起来像:
FROM confluentinc/cp-kafka-connect:4.0.0
ARG VERSION=0.0.2.15
RUN curl -Ls https://github.com/jcustenborder/kafka-connect-rabbitmq/releases/download/$VERSION/kafka-connect-rabbitmq-$VERSION.tar.gz | tar -xzC /tmp && \
mkdir -p /etc/kafka-connect/jars && \
cp -R /tmp/usr/share/kafka-connect/kafka-connect-rabbitmq/. /etc/kafka-connect/jars && \
ls -l /etc/kafka-connect/jars
RUN ls -l /etc/kafka-connect/jars
ls
我可以确认 JAR 已按预期复制。ls
在 RUN
行,它们不会显示(随后当我运行图像时它们不会出现在我的容器中)。Sending build context to Docker daemon 2.56kB
Step 1/4 : FROM confluentinc/cp-kafka-connect:4.0.0
---> 4db60f092134
Step 2/4 : ARG VERSION=0.0.2.15
---> Using cache
---> dc641b6beb04
Step 3/4 : RUN curl -Ls https://github.com/jcustenborder/kafka-connect-rabbitmq/releases/download/$VERSION/kafka-connect-rabbitmq-$VERSION.tar.gz | tar -xzC /tmp && cp /tmp/usr/share/kafka-connect/kafka-connect-rabbitmq/kafka-connect-rabbitmq-$VERSION.jar /usr/share/java/ && mkdir -p /etc/kafka-connect/jars && cp /tmp/usr/share/kafka-connect/kafka-connect-rabbitmq/*.jar /etc/kafka-connect/jars && ls -l /etc/kafka-connect/jars
---> Running in f48dbf0e487e
total 6804
-rw-r--r-- 1 root root 491199 Apr 2 03:48 amqp-client-4.2.0.jar
-rw-r--r-- 1 root root 74557 Apr 2 03:48 annotations-2.0.1.jar
-rw-r--r-- 1 root root 100811 Apr 2 03:48 connect-utils-0.3.101.jar
-rw-r--r-- 1 root root 7046 Apr 2 03:48 connect-utils-testing-data-0.3.101.jar
-rw-r--r-- 1 root root 1493680 Apr 2 03:48 freemarker-2.3.25-incubating.jar
-rw-r--r-- 1 root root 2256213 Apr 2 03:48 guava-18.0.jar
-rw-r--r-- 1 root root 55784 Apr 2 03:48 jackson-annotations-2.8.0.jar
-rw-r--r-- 1 root root 281079 Apr 2 03:48 jackson-core-2.8.5.jar
-rw-r--r-- 1 root root 1236315 Apr 2 03:48 jackson-databind-2.8.5.jar
-rw-r--r-- 1 root root 749499 Apr 2 03:48 javassist-3.19.0-GA.jar
-rw-r--r-- 1 root root 31212 Apr 2 03:48 kafka-connect-rabbitmq-0.0.2.15.jar
-rw-r--r-- 1 root root 129763 Apr 2 03:48 reflections-0.9.10.jar
-rw-r--r-- 1 root root 41071 Apr 2 03:48 slf4j-api-1.7.21.jar
Removing intermediate container f48dbf0e487e
---> ad2ca0767def
Step 4/4 : RUN ls -l /etc/kafka-connect/jars
---> Running in c0b5fda45249
total 0
Removing intermediate container c0b5fda45249
---> 5fef032d5aba
Successfully built 5fef032d5aba
Successfully tagged myfirstimage:latest
我的猜测是 /etc/kafka-connect/jars
目录被声明为 VOLUME
在该图像的 Dockerfile 中。
以及 docker inspect
的输出命令证实了我的猜测:
$ docker image inspect confluentinc/cp-kafka-connect:4.0.0 --format '{{.Config.Volumes}}'
map[/etc/kafka-connect/secrets:{} /etc/kafka/secrets:{} /var/lib/kafka/data:{} /etc/kafka-connect/jars:{}]
If any build steps change the data within the volume after it has been declared, those changes will be discarded.
VOLUME /etc/kafka-connect/jars
. ls
此步骤中的命令正常工作。 docker run -v /path/contains/jar/files:/etc/kafka-connect/jars <IMAGE>
关于Dockerfile - 中间容器究竟在做什么?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/49604332/
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