Commands supported by Image Builder - Elastic Compute Service

This topic describes commands supported by Image Builder, including specific Dockerfile commands. Familiarize yourself with the commands to get started with Image Builder.

The following table describes the commands supported by Image Builder.

Command	Format or example	Description
FROM	`FROM IMAGE:<Image ID>` `FROM IMAGE_FAMILY:<Image family name>`	Specify a source image. This command is not supported by image components. After you configure a source image in an image template, the system automatically generates a `FROM` command based on the source image. Note If you specify a `FROM` command and a source image in an image template, the FROM command that you specify overwrites the automatically generated `FROM` command.
COMPONENT	`COMPONENT ic-bp18hy47cqavewsb****`	Specify image components. You can specify system components or custom components. The command is applicable only to image templates. When you create an image template, you can run the command to specify one or more image components in the image template.
RESTART	`RESTART`	Restart the instance. Do not add parameters to the command.
RUN	`RUN echo hello;\ echo world;`	Build an image. The command can be split into multiple lines. An escape character (\) must be added to the end of each line except for the last line.
ENV	`ENV key value` `ENV key1="value1" key2="value2"`	Configure environment variables. Pass environment variables in the key="value" format into the command. Note Double quotation marks (") are required before and after the value of each environment variable in the command. Example: `ENV key1="value1" key2="value2"`.
WORKDIR	`WORKDIR /<path>` `WORKDIR <path1>/<path2>`	Configure working directories.
COPY	`COPY {Network file address} <On-premises directory>` `COPY <On-premises file path> <On-premises directory>`	Copy files. Note Network files must be downloaded by using the `wget` utility, and `query strings` are not supported in URLs. In addition, intermediate instances must be able to access the Internet.
USER	`USER <username>`	Specify a user. Note Set the `<username>` variable to an existing username. Otherwise, an error is reported after the command is run.
LABEL	`LABEL user="username"\ date="2020-11-11" key="value"`	Add metadata to the image template. The command can be split into multiple lines. An escape character (\) must be added to the end of each line except for the last line.
CMD	`CMD ["executable","param1","param2"]` `CMD command param1 param2`	Specify commands that run on instance startup.
ENTRYPOINT	`ENTRYPOINT ["executable","param1","param2"]` `CMD command param1 param2`	Specify commands that run on instance startup.

References

For more information about Dockerfile commands, such as the differences between CMD and ENTRYPOINT commands, see Dockerfile reference.