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Kaniko works differently from Docker. It runs inside a Docker container and detect and extract new layers to build Docker images. Since Kaniko manipulates the filesystem (layers) inside the Docker container, it can have unexpected side effect if not used carefully. For this reason, the developer team suggests users to …
Run Docker Containers Inside a Docker Container
You can run Docker containers inside a Docker container.
To allow this,
you have to pass the docker socks into the container
using the option -v /var/run/docker.sock:/var/run/docker.sock.
For more discussions,
please refer to
How To Run Docker in Docker Container [3 Easy Methods …
Hands on the Python module subprocess
General Tips¶
The method
subprocess.runis preferred over older high-level APIs (subprocess.call,subprocess.check_callandsubprocess.check_output). The methodsubprocess.Popen(which powers the high-level APIs) can be used if you need advanced controls. When running a shell command usingsubprocess.run,Avoid using system shell (i.e., avoid using
shell=True) for 2 reasons. First, avoid shell injection attack. Second, there is no need for you to manually escape special characters in the command.
Hands on pathlib.Path
Understand Execuation of SQL Statements
Execuation Order¶
A SQL statement selects rows and columns from a big (rectangular) table.
You put columns that you want to select after SELECT
and rows you want to select after FROM.
A SQL statement is executed as follows.
First,
the (INNER|LEFT|RIGHT|FULL) JOIN (ON) is executed if any (see more explanation later).
Second,
the WHERE