packer-cn/website/pages/docs/commands/build.mdx

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---
description: |
The `packer build` command takes a template and runs all the builds within it
in order to generate a set of artifacts. The various builds specified within a
template are executed in parallel, unless otherwise specified. And the
artifacts that are created will be outputted at the end of the build.
layout: docs
page_title: packer build - Commands
sidebar_title: <tt>build</tt>
---
# `build` Command
The `packer build` command takes a template and runs all the builds within it
in order to generate a set of artifacts. The various builds specified within a
template are executed in parallel, unless otherwise specified. And the
artifacts that are created will be outputted at the end of the build.
## Options
- `-color=false` - Disables colorized output. Enabled by default.
- `-debug` - Disables parallelization and enables debug mode. Debug mode
flags the builders that they should output debugging information. The exact
behavior of debug mode is left to the builder. In general, builders usually
will stop between each step, waiting for keyboard input before continuing.
This will allow the user to inspect state and so on.
`@include 'commands/except.mdx'`
- `-force` - Forces a builder to run when artifacts from a previous build
prevent a build from running. The exact behavior of a forced build is left
to the builder. In general, a builder supporting the forced build will
remove the artifacts from the previous build. This will allow the user to
repeat a build without having to manually clean these artifacts beforehand.
- `-on-error=cleanup` (default), `-on-error=abort`, `-on-error=ask`, `-on-error=run-cleanup-provisioner` -
Selects what to do when the build fails during provisioning. Please note that
this only affects the build during the provisioner run, not during the
post-processor run, because it is related to whether or not to keep the
instance running and related artifacts like generated SSH keys on the system
when a provisioner fails.
- `cleanup` cleans up after the previous steps, deleting temporary files and virtual machines.
- `abort` exits without any cleanup, which might require the next build to use `-force`.
- `ask` presents a prompt and waits for you to decide to clean up, abort, or retry
the failed step.
- `run-cleanup-provisioner` aborts and exits without any cleanup besides
the [error-cleanup-provisioner](/docs/templates/provisioners#on-error-provisioner) if one is defined.
`@include 'commands/only.mdx'`
- `-parallel-builds=N` - Limit the number of builds to run in parallel, 0
means no limit (defaults to 0).
- `-timestamp-ui` - Enable prefixing of each ui output with an RFC3339
timestamp.
- `-var` - Set a variable in your packer template. This option can be used
multiple times. This is useful for setting version numbers for your build.
- `-var-file` - Set template variables from a file.