Packer
The post-processors block
Note: This page is about HCL2 Packer templates. HCL2 templates were first introduced as a beta feature into Packer version 1.5. As of v1.7, HCL2 support is no longer in beta, and is the preferred way to write Packer configuration. For the old-style stable configuration language see template docs. As of v1.6.2, you can convert your legacy JSON template into an HCL2 config file using the hcl2_upgrade command.
The post-processors block allows to define lists of
post-processors, that will run
from the artifact of each build.
# builds.pkr.hcl
build {
# ...
post-processors {
post-processor "shell-local" { # create an artifice.txt file containing "hello"
inline = [ "echo hello > artifice.txt" ]
}
post-processor "artifice" { # tell packer this is now the new artifact
files = ["artifice.txt"]
}
post-processor "checksum" { # checksum artifice.txt
checksum_types = [ "md5", "sha512" ] # checksum the artifact
keep_input_artifact = true # keep the artifact
}
}
}
The post-processor block
allows to define multiple post-processors that will run from the Artifact of
each build. Read the post-processor documentation to know how to use a
post-processor.
Difference between a post-processor and a post-processors block
These two templates are doing the same thing:
# builds.pkr.hcl
build {
# ... build image
post-processor "checksum" { # checksum image
checksum_types = [ "md5", "sha512" ] # checksum the artifact
}
post-processor "amazon-import" { # upload image to AWS
}
post-processor "googlecompute-import" { # upload image to GCP
}
}
# builds.pkr.hcl
build {
# ... build image
post-processors {
post-processor "checksum" { # checksum image
checksum_types = [ "md5", "sha512" ] # checksum the artifact
}
}
post-processors {
post-processor "amazon-import" { # upload image to AWS
}
}
post-processors {
post-processor "googlecompute-import" { # upload image to GCP
}
}
}
Each of these post-processors will start after each build -- that is, after
each provision step has run on each source --. In all cases the source image is
going to be deleted.