211 lines
7.2 KiB
ReStructuredText
211 lines
7.2 KiB
ReStructuredText
Inventory
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=========
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Introduction
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------------
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cdist comes with simple built-in tag based inventory. It is a simple inventory
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with list of hosts and a host has a list of tags.
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Inventory functionality is still in **beta** so it can be used only if beta
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command line flag is specified (-b, --beta) or setting CDIST_BETA env var.
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Description
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-----------
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The idea is to have simple tagging inventory. There is a list of hosts and for
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each host there are tags. Inventory database is a set of files under inventory
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database base directory. Filename equals hostname. Each file contains tags for
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hostname with each tag on its own line.
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Using inventory you can now configure hosts by selecting them by tags.
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Tags have no values, as tags are just tags. Tag name-value would in this
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context mean that host has two tags and it is selected by specifying that both
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tags are present.
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This inventory is **KISS** cdist built-in inventory database. You can maintain it
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using cdist inventory interface or using standard UNIX tools.
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cdist inventory interface
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-------------------------
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With cdist inventory interface you can list host(s) and tag(s), add host(s),
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add tag(s), delete host(s) and delete tag(s).
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Configuring hosts using inventory
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---------------------------------
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config command now has new options, **-t**, **-a** and **-A**.
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**-A** means that all hosts in tag db is selected.
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**-a** means that selected hosts must contain ALL specified tags.
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**-t** means that host specifies tag - all hosts that have specified tags are
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selected.
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Examples
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--------
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.. code-block:: sh
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# List inventory content
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$ cdist inventory list -b
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# List inventory for specified host localhost
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$ cdist inventory list -b localhost
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# List inventory for specified tag loadbalancer
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$ cdist inventory list -b -t loadbalancer
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# Add hosts to inventory
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$ cdist inventory add-host -b web1 web2 web3
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# Delete hosts from file old-hosts from inventory
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$ cdist inventory del-host -b -f old-hosts
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# Add tags to specifed hosts
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$ cdist inventory add-tag -b -t europe,croatia,web,static web1 web2
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# Add tag to all hosts in inventory
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$ cdist inventory add-tag -b -t vm
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# Delete all tags from specified host
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$ cdist inventory del-tag -b -a localhost
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# Delete tags read from stdin from hosts specified by file hosts
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$ cdist inventory del-tag -b -T - -f hosts
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# Configure hosts from inventory with any of specified tags
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$ cdist config -b -t web dynamic
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# Configure hosts from inventory with all specified tags
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$ cdist config -b -t -a web dynamic
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# Configure all hosts from inventory db
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$ cdist config -b -A
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Example of manipulating database
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--------------------------------
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.. code-block:: sh
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$ python3 scripts/cdist inventory list -b
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$ python3 scripts/cdist inventory add-host -b localhost
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$ python3 scripts/cdist inventory add-host -b test.mycloud.net
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$ python3 scripts/cdist inventory list -b
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localhost
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test.mycloud.net
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$ python3 scripts/cdist inventory add-host -b web1.mycloud.net web2.mycloud.net shell1.mycloud.net shell2.mycloud.net
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$ python3 scripts/cdist inventory list -b
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localhost
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test.mycloud.net
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web1.mycloud.net
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web2.mycloud.net
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shell1.mycloud.net
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shell2.mycloud.net
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$ python3 scripts/cdist inventory add-tag -b -t web web1.mycloud.net web2.mycloud.net
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$ python3 scripts/cdist inventory add-tag -b -t shell shell1.mycloud.net shell2.mycloud.net
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$ python3 scripts/cdist inventory add-tag -b -t cloud
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$ python3 scripts/cdist inventory list -b
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localhost cloud
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test.mycloud.net cloud
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web1.mycloud.net cloud,web
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web2.mycloud.net cloud,web
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shell1.mycloud.net cloud,shell
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shell2.mycloud.net cloud,shell
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$ python3 scripts/cdist inventory add-tag -b -t test,web,shell test.mycloud.net
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$ python3 scripts/cdist inventory list -b
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localhost cloud
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test.mycloud.net cloud,shell,test,web
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web1.mycloud.net cloud,web
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web2.mycloud.net cloud,web
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shell1.mycloud.net cloud,shell
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shell2.mycloud.net cloud,shell
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$ python3 scripts/cdist inventory del-tag -b -t shell test.mycloud.net
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$ python3 scripts/cdist inventory list -b
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localhost cloud
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test.mycloud.net cloud,test,web
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web1.mycloud.net cloud,web
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web2.mycloud.net cloud,web
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shell1.mycloud.net cloud,shell
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shell2.mycloud.net cloud,shell
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$ python3 scripts/cdist inventory add-tag -b -t all
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$ python3 scripts/cdist inventory add-tag -b -t mistake
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$ python3 scripts/cdist inventory list -b
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localhost all,cloud,mistake
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test.mycloud.net all,cloud,mistake,test,web
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web1.mycloud.net all,cloud,mistake,web
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web2.mycloud.net all,cloud,mistake,web
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shell1.mycloud.net all,cloud,mistake,shell
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shell2.mycloud.net all,cloud,mistake,shell
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$ python3 scripts/cdist inventory del-tag -b -t mistake
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$ python3 scripts/cdist inventory list -b
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localhost all,cloud
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test.mycloud.net all,cloud,test,web
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web1.mycloud.net all,cloud,web
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web2.mycloud.net all,cloud,web
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shell1.mycloud.net all,cloud,shell
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shell2.mycloud.net all,cloud,shell
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$ python3 scripts/cdist inventory del-host -b localhost
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$ python3 scripts/cdist inventory list -b
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test.mycloud.net all,cloud,test,web
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web1.mycloud.net all,cloud,web
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web2.mycloud.net all,cloud,web
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shell1.mycloud.net all,cloud,shell
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shell2.mycloud.net all,cloud,shell
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$ python3 scripts/cdist inventory list -b -t web
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test.mycloud.net all,cloud,test,web
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web1.mycloud.net all,cloud,web
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web2.mycloud.net all,cloud,web
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$ python3 scripts/cdist inventory list -b -t -a web test
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test.mycloud.net all,cloud,test,web
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$ python3 scripts/cdist inventory list -b -t -a web all
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test.mycloud.net all,cloud,test,web
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web1.mycloud.net all,cloud,web
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web2.mycloud.net all,cloud,web
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$ python3 scripts/cdist inventory list -b -t web all
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test.mycloud.net all,cloud,test,web
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web1.mycloud.net all,cloud,web
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web2.mycloud.net all,cloud,web
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shell1.mycloud.net all,cloud,shell
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shell2.mycloud.net all,cloud,shell
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$ cd cdist/inventory
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$ ls -1
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shell1.mycloud.net
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shell2.mycloud.net
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test.mycloud.net
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web1.mycloud.net
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web2.mycloud.net
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$ ls -l
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total 20
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-rw-r--r-- 1 darko darko 16 Jun 24 12:43 shell1.mycloud.net
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-rw-r--r-- 1 darko darko 16 Jun 24 12:43 shell2.mycloud.net
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-rw-r--r-- 1 darko darko 19 Jun 24 12:43 test.mycloud.net
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-rw-r--r-- 1 darko darko 14 Jun 24 12:43 web1.mycloud.net
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-rw-r--r-- 1 darko darko 14 Jun 24 12:43 web2.mycloud.net
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$ cat test.mycloud.net
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test
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all
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web
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cloud
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$ cat web2.mycloud.net
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all
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web
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cloud
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For more info about inventory commands and options see `cdist <man1/cdist.html>`_\ (1).
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Using external inventory
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------------------------
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cdist can be used with any external inventory where external inventory is
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some storage or database from which you can get a list of hosts to configure.
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cdist can then be fed with this list of hosts through stdin or file using
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**-f** option. For example, if your host list is stored in sqlite3 database
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hosts.db and you want to select hosts which purpose is **django** then you
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can use it with cdist like:
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.. code-block:: sh
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$ sqlite3 hosts.db "select hostname from hosts where purpose = 'django';" | cdist config
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