Difference between copy and ADD | How to check the system log | How to check logs in real time

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Difference between copy and ADD

COPY and ADD are both Dockerfile instructions used to copy files from a source to a destination within a Docker image. However, there are some differences between the two:

Syntax:

The syntax for COPY is:

COPY

The syntax for ADD is:

ADD

In terms of syntax, ADD is more flexible than COPY. This is because ADD allows you to use URLs as the source, and it also supports the automatic unpacking of compressed files.

Functionality:

COPY simply copies files from the source to the destination. It does not do any unpacking or manipulation of the files.

ADD, on the other hand, has some additional functionality. It can automatically unpack compressed files, such as tarballs, zip files, and gzip files. It can also download files from URLs.

Caching:

COPY has better caching than ADD. This means that if you change a file and rebuild your image, Docker will only rebuild the layers that depend on the changed file. This can make the build process faster.

ADD, on the other hand, does not have good caching. This means that if you change a file and rebuild your image, Docker will rebuild all the layers, even if they do not depend on the changed file.

In general, it is recommended to use COPY instead of ADD, unless you need the additional functionality of ADD. This is because COPY has better caching and is simpler to use.

How to check the system log:

To check the logs in Ubuntu, you can follow these simple steps:

Open the terminal on your Ubuntu system.

Type the following command to view the system logs:

sudo less /var/log/syslog

This will display the system logs in the terminal. You can use the arrow keys to scroll through the logs.

To search for a specific keyword in the logs, type the following command:

sudo grep "keyword" /var/log/syslog

Replace "keyword" with the keyword you want to search for.

To view the logs of a specific application, type the following command:

Replace "application" with the name of the application whose logs you want to view.

To view the logs in real-time as they are being generated, type the following command:

tail -f /var/log/syslog

This will display the logs in the terminal, and new logs will be added to the display as they are generated.

That's it! These are the basic steps to check the logs in Ubuntu.

How to check logs in real time?

To check logs in real-time, you can use the docker logs command with the -f flag. This will stream the logs in real-time to your console. For example, to view the logs for a container named my_container, you can run the following command:

docker logs -f my_container

This will display the logs in real-time as they are generated by the container. You can use CTRL+C to stop streaming the logs.

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