Salt Package Manager

The Salt Package Manager, or SPM, allows Salt formulas to be packaged, for ease of deployment. The design of SPM was influenced by other existing packaging systems including RPM, Yum, and Pacman.

Building Packages

Before SPM can install packages, they must be built. The source for these packages is often a Git repository, such as those found at the saltstack-formulas organization on GitHub.

FORMULA

In addition to the formula itself, a FORMULA file must exist which describes the package. An example of this file is:

name: apache
os: RedHat, Debian, Ubuntu, Suse, FreeBSD
os_family: RedHat, Debian, Suse, FreeBSD
version: 201506
release: 2
summary: Formula for installing Apache
description: Formula for installing Apache

Required Fields

This file must contain at least the following fields:

name

The name of the package, as it will appear in the package filename, in the repository metadata, and the package database. Even if the source formula has -formula in its name, this name should probably not include that. For instance, when packaging the apache-formula, the name should be set to apache.

os

The value of the os grain that this formula supports. This is used to help users know which operating systems can support this package.

os_family

The value of the os_family grain that this formula supports. This is used to help users know which operating system families can support this package.

version

The version of the package. While it is up to the organization that manages this package, it is suggested that this version is specified in a YYYYMM format. For instance, if this version was released in June 2015, the package version should be 201506. If multiple released are made in a month, the releasee field should be used.

minimum_version

Minimum recommended version of Salt to use this formula. Not currently enforced.

release

This field refers primarily to a release of a version, but also to multiple versions within a month. In general, if a version has been made public, and immediate updates need to be made to it, this field should also be updated.

summary

A one-line description of the package.

description

A more detailed description of the package which can contain more than one line.

Optional Fields

The following fields may also be present.

top_level_dir

This field is optional, but highly recommended. If it is not specified, the package name will be used.

Formula repositories typically do not store .sls files in the root of the repository; instead they are stored in a subdirectory. For instance, an apache-formula repository would contain a directory called apache, which would contain an init.sls, plus a number of other related files. In this instance, the top_level_dir should be set to apache.

Files outside the top_level_dir, such as README.rst, FORMULA, and LICENSE will not be installed. The exceptions to this rule are files that are already treated specially, such as pillar.example and _modules/.

Building a Package

Once a FORMULA file has been created, it is placed into the root of the formula that is to be turned into a package. The spm build command is used to turn that formula into a package:

spm build /path/to/saltstack-formulas/apache-formula

The resulting file will be placed in the build directory. By default this directory is located at /srv/spm/.

Building Repositories

Once one or more packages have been built, they can be made available to SPM via a package repository. Place the packages into the directory to be served and issue an spm create_repo command:

spm create_repo /srv/spm

This command is used, even if repository metadata already exists in that directory. SPM will regenerate the repository metadata again, using all of the packages in that directory.

Configuring Remote Repositories

Before SPM can use a repository, two things need to happen. First, SPM needs to know where the repositories are. Then it needs to pull down the repository metadata.

Repository Configuration Files

Normally repository configuration files are placed in the /etc/salt/spm.repos.d. These files contain the name of the repository, and the link to that repository:

my_repo:
  url: https://spm.example.com/

The URL can use http, https, ftp, or file.

local_repo:
  url: file:///srv/spm

Updating Local Repository Metadata

Once the repository is configured, its metadata needs to be downloaded. At the moment, this is a manual process, using the spm update_repo command.

spm update_repo

Installing Packages

Packages may be installed either from a local file, or from an SPM repository. To install from a repository, use the spm install command:

spm install apache

To install from a local file, use the spm local install command:

spm local install /srv/spm/apache-201506-1.spm

Currently, SPM does not check to see if files are already in place before installing them. That means that existing files will be overwritten without warning.

Pillars

Formula packages include a pillar.example file. Rather than being placed in the formula directory, this file is renamed to <formula name>.sls.orig and placed in the pillar_path, where it can be easily updated to meet the user's needs.

Loader Modules

When an execution module is placed in <file_roots>/_modules/ on the master, it will automatically be synced to minions, the next time a sync operation takes place. Other modules are also propagated this way: state modules can be placed in _states/, and so on.

When SPM detects a file in a package which resides in one of these directories, that directory will be placed in <file_roots> instead of in the formula directory with the rest of the files.

Removing Packages

Packages may be removed once they are installed using the spm remove command.

spm remove apache

If files have been modified, they will not be removed. Empty directories will also be removed.

Technical Information

Packages are built using BZ2-compressed tarballs. By default, the package database is stored using the sqlite3 driver (see Loader Modules below).

Support for these are built into Python, and so no external dependencies are needed.

All other files belonging to SPM use YAML, for portability and ease of use and maintainability.

SPM-Specific Loader Modules

SPM was designed to behave like traditional package managers, which apply files to the filesystem and store package metadata in a local database. However, because modern infrastructures often extend beyond those use cases, certain parts of SPM have been broken out into their own set of modules.

Package Database

By default, the package database is stored using the sqlite3 module. This module was chosen because support for SQLite3 is built into Python itself.

Please see the SPM Development Guide for information on creating new modules for package database management.

Package Files

By default, package files are installed using the local module. This module applies files to the local filesystem, on the machine that the package is installed on.

Please see the SPM Development Guide for information on creating new modules for package file management.

SPM Configuration

There are a number of options that are specific to SPM. They may be configured in the master configuration file, or in SPM's own spm configuration file (normally located at /etc/salt/spm). If configured in both places, the spm file takes precedence. In general, these values will not need to be changed from the defaults.

spm_logfile

Default: /var/log/salt/spm

Where SPM logs messages.

spm_repos_config

Default: /etc/salt/spm.repos

SPM repositories are configured with this file. There is also a directory which corresponds to it, which ends in .d. For instance, if the filename is /etc/salt/spm.repos, the directory will be /etc/salt/spm.repos.d/.

spm_cache_dir

Default: /var/cache/salt/spm

When SPM updates package repository metadata and downloads packaged, they will be placed in this directory. The package database, normally called packages.db, also lives in this directory.

spm_db

Default: /var/cache/salt/spm/packages.db

The location and name of the package database. This database stores the names of all of the SPM packages installed on the system, the files that belong to them, and the metadata for those files.

spm_build_dir

Default: /srv/spm

When packages are built, they will be placed in this directory.

spm_build_exclude

Default: ['.git']

When SPM builds a package, it normally adds all files in the formula directory to the package. Files listed here will be excluded from that package. This option requires a list to be specified.

spm_build_exclude:
  - .git
  - .svn

Types of Packages

SPM supports different types of formula packages. The function of each package is denoted by its name. For instance, packages which end in -formula are considered to be Salt States (the most common type of formula). Packages which end in -conf contain configuration which is to be placed in the /etc/salt/ directory. Packages which do not contain one of these names are treated as if they have a -formula name.

formula

By default, most files from this type of package live in the /srv/spm/salt/ directory. The exception is the pillar.example file, which will be renamed to <package_name>.sls and placed in the pillar directory (/srv/spm/pillar/ by default).

reactor

By default, files from this type of package live in the /srv/spm/reactor/ directory.

conf

The files in this type of package are configuration files for Salt, which normally live in the /etc/salt/ directory. Configuration files for packages other than Salt can and should be handled with a Salt State (using a formula type of package).

Generated on November 28, 2016 at 06:44:15 MST.

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