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What 63.Dockerfile most common instructions are?
1) FROM: We use the FROM instruction set for subsequent base image. In each of the active Dockerfile, FROM is the first instruction.
2) LABEL: We use the LABEL According to the project, modules, licenses and other organizations of our mirrors. We can also use LABEL to help automate. In LABEL, we specify a key-value pair may be used to programmatically after treatment Dockerfile.
3) RUN: We use the RUN command to execute any command in a new layer above the current image. Use every RUN command, we add something on top of the image, and use it in a subsequent step Dockerfile in.
4) CMD: We use the CMD command provides default values to perform container. In Dockerfile, if we include multiple CMD command, using only the last instruction.
64.Docker mirror layer and what is the difference?
Mirror: Docker image is constructed from a series of read-only layer layer: Each layer represents one instruction of image Dockerfile.
65.Docker commonly used commands?
dockerpull pulling or update the specified Mirror Mirror dockerpush will be pushed to the remote repository dockerrm delete container dockerrmi Remove Mirror Mirror dockerps dockerimages list all list all containers
66.Dockerfile commands COPY and ADD command What is the difference?
In general, although ADD and COPY similar in function, but preferred COPY. That is because it is more understandable than ADD. COPY only supports copying files to the local container, and ADD have some features (such as local and remote tar extract URL support is limited), these functions are not obvious. Thus, the best use of local ADD tar file is automatically extracted to the mirror. For example: ADDapache-tomcat-8.5.20.tar.gz /
67. What is rabbitmq?
MQ: Message Queue
AMQP Advanced Message Queuing Protocol using a message queue technology, the biggest feature is that the consumer does not need to ensure that providers exist to achieve a high degree of decoupling between service
Uses: Traffic clipping, regular tasks.