rpms/containers-common
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local build

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Daniel J Walsh 2023-07-09 07:42:50 -04:00
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Containerfile.5.md
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@ -54,11 +54,11 @@ A Containerfile is similar to a Makefile.
# FORMAT # FORMAT
`FROM image` `FROM image [AS <name>]`
`FROM image:tag` `FROM image:tag [AS <name>]`
`FROM image@digest` `FROM image@digest [AS <name>]`
-- The **FROM** instruction sets the base image for subsequent instructions. A -- The **FROM** instruction sets the base image for subsequent instructions. A
valid Containerfile must have either **ARG** or *FROM** as its first instruction. valid Containerfile must have either **ARG** or *FROM** as its first instruction.
@ -82,6 +82,9 @@ A Containerfile is similar to a Makefile.
-- If no digest is given to the **FROM** instruction, container engines apply the -- If no digest is given to the **FROM** instruction, container engines apply the
`latest` tag. If the used tag does not exist, an error is returned. `latest` tag. If the used tag does not exist, an error is returned.
-- A name can be assigned to a build stage by adding **AS name** to the instruction.
The name can be referenced later in the Containerfile using the **FROM** or **COPY --from=<name>** instructions.
**MAINTAINER** **MAINTAINER**
-- **MAINTAINER** sets the Author field for the generated images. -- **MAINTAINER** sets the Author field for the generated images.
Useful for providing users with an email or url for support. Useful for providing users with an email or url for support.
@ -362,10 +365,10 @@ The secret needs to be passed to the build using the --secret flag. The final im
-- **COPY** has two forms: -- **COPY** has two forms:
``` ```
COPY <src> <dest> COPY [--chown=<user>:<group>] [--chmod=<mode>] <src> <dest>
# Required for paths with whitespace # Required for paths with whitespace
COPY ["<src>",... "<dest>"] COPY [--chown=<user>:<group>] [--chmod=<mode>] ["<src>",... "<dest>"]
``` ```
The **COPY** instruction copies new files from `<src>` and The **COPY** instruction copies new files from `<src>` and
@ -378,6 +381,16 @@ The secret needs to be passed to the build using the --secret flag. The final im
attempt to unpack it. All new files and directories are created with mode **0755** attempt to unpack it. All new files and directories are created with mode **0755**
and with the uid and gid of **0**. and with the uid and gid of **0**.
`--chown=<user>:<group>` changes the ownership of new files and directories.
Supports names, if defined in the containers `/etc/passwd` and `/etc/groups` files, or using
uid and gid integers. The build will fail if a user or group name can't be mapped in the container.
Numeric id's are set without looking them up in the container.
`--chmod=<mode>` changes the mode of new files and directories.
The optional flag `--from=name` can be used to copy files from a named previous build stage. It
changes the context of `<src>` from the build context to the named build stage.
**ENTRYPOINT** **ENTRYPOINT**
-- **ENTRYPOINT** has two forms: -- **ENTRYPOINT** has two forms: