Chef Manage

Chef Manage

The Chef management console enables the management of nodes, data bags, roles, environments, and cookbooks by using a web user interface. In addition, access to nodes, data bags, roles, environments, and cookbooks is configurable using role-based access control (RBAC).

Nodes

A node is any machine—physical, virtual, cloud, network device, etc.—that is under management by Chef.

The Chef management console provides ways for users to delete nodes and reset their private keys, edit node attributes, manage the run-lists, configure user and group permissions, and manage tags.

Search

Search indexes allow queries to be made for any type of data that is indexed by the Chef server, including data bags (and data bag items), environments, nodes, and roles. A defined query syntax is used to support search patterns like exact, wildcard, range, and fuzzy. A search is a full-text query that can be done from several locations, including from within a recipe, by using the search subcommand in knife, the search method in the Recipe DSL, the search box in the Chef management console, and by using the /search or /search/INDEX endpoints in the Chef server API. The search engine is based on Apache Solr and is run from the Chef server.

Query Syntax

A search query is comprised of two parts: the key and the search pattern. A search query has the following syntax:

key:search_pattern

where key is a field name that is found in the JSON description of an indexable object on the Chef server (a role, node, client, environment, or data bag) and search_pattern defines what will be searched for, using one of the following search patterns: exact, wildcard, range, or fuzzy matching. Both key and search_pattern are case-sensitive; key has limited support for multiple character wildcard matching using an asterisk (“*”) (and as long as it is not the first character).

Keys

A field name/description pair is available in the JSON object. Use the field name when searching for this information in the JSON object. Any field that exists in any JSON description for any role, node, chef-client, environment, or data bag can be searched.

Nested Fields

A nested field appears deeper in the JSON data structure. For example, information about a network interface might be several layers deep: node[:network][:interfaces][:en1]. When nested fields are present in a JSON structure, the chef-client will extract those nested fields to the top-level, flattening them into compound fields that support wildcard search patterns.

By combining wildcards with range-matching patterns and wildcard queries, it is possible to perform very powerful searches, such as using the vendor part of the MAC address to find every node that has a network card made by the specified vendor.

Consider the following snippet of JSON data:

{"network":
  [
  //snipped...
    "interfaces",
      {"en1": {
        "number": "1",
        "flags": [
          "UP",
          "BROADCAST",
          "SMART",
          "RUNNING",
          "SIMPLEX",
          "MULTICAST"
        ],
        "addresses": {
          "fe80::fa1e:dfff:fed8:63a2": {
            "scope": "Link",
            "prefixlen": "64",
            "family": "inet6"
          },
          "f8:1e:df:d8:63:a2": {
            "family": "lladdr"
          },
          "192.168.0.195": {
            "netmask": "255.255.255.0",
            "broadcast": "192.168.0.255",
            "family": "inet"
          }
        },
        "mtu": "1500",
        "media": {
          "supported": {
            "autoselect": {
              "options": [

              ]
            }
          },
          "selected": {
            "autoselect": {
              "options": [

              ]
            }
          }
        },
        "type": "en",
        "status": "active",
        "encapsulation": "Ethernet"
      },
  //snipped...

Before this data is indexed on the Chef server, the nested fields are extracted into the top level, similar to:

"broadcast" => "192.168.0.255",
"flags"     => ["UP", "BROADCAST", "SMART", "RUNNING", "SIMPLEX", "MULTICAST"]
"mtu"       => "1500"

which allows searches like the following to find data that is present in this node:

node "broadcast:192.168.0.*"

or:

node "mtu:1500"

or:

node "flags:UP"

This data is also flattened into various compound fields, which follow the same pattern as the JSON hierarchy and use underscores (_) to separate the levels of data, similar to:

# ...snip...
"network_interfaces_en1_addresses_192.168.0.195_broadcast" => "192.168.0.255",
"network_interfaces_en1_addresses_fe80::fa1e:tldr_family"  => "inet6",
"network_interfaces_en1_addresses"                         => ["fe80::fa1e:tldr","f8:1e:df:tldr","192.168.0.195"]
# ...snip...

which allows searches like the following to find data that is present in this node:

node "network_interfaces_en1_addresses:192.168.0.195"

This flattened data structure also supports using wildcard compound fields, which allow searches to omit levels within the JSON data structure that are not important to the search query. In the following example, an asterisk (*) is used to show where the wildcard can exist when searching for a nested field:

"network_interfaces_*_flags"     => ["UP", "BROADCAST", "SMART", "RUNNING", "SIMPLEX", "MULTICAST"]
"network_interfaces_*_addresses" => ["fe80::fa1e:dfff:fed8:63a2", "192.168.0.195", "f8:1e:df:d8:63:a2"]
"network_interfaces_en0_media_*" => ["autoselect", "none", "1000baseT", "10baseT/UTP", "100baseTX"]
"network_interfaces_en1_*"       => ["1", "UP", "BROADCAST", "SMART", "RUNNING", "SIMPLEX", "MULTICAST",
                                     "fe80::fa1e:dfff:fed8:63a2", "f8:1e:df:d8:63:a2", "192.168.0.195",
                                     "1500", "supported", "selected", "en", "active", "Ethernet"]

For each of the wildcard examples above, the possible values are shown contained within the brackets. When running a search query, the query syntax for wildcards is to simply omit the name of the node (while preserving the underscores), similar to:

network_interfaces__flags

This query will search within the flags node, within the JSON structure, for each of UP, BROADCAST, SMART, RUNNING, SIMPLEX, and MULTICAST.

About Patterns

A search pattern is a way to fine-tune search results by returning anything that matches some type of incomplete search query. There are four types of search patterns that can be used when searching the search indexes on the Chef server: exact, wildcard, range, and fuzzy.

Exact Matching

An exact matching search pattern is used to search for a key with a name that exactly matches a search query. If the name of the key contains spaces, quotes must be used in the search pattern to ensure the search query finds the key. The entire query must also be contained within quotes, so as to prevent it from being interpreted by Ruby or a command shell. The best way to ensure that quotes are used consistently is to quote the entire query using single quotes (‘ ‘) and a search pattern with double quotes (” ”).

Wildcard Matching

A wildcard matching search pattern is used to query for substring matches that replace zero (or more) characters in the search pattern with anything that could match the replaced character. There are two types of wildcard searches:

• A question mark (?) can be used to replace exactly one character (as long as that character is not the first character in the search pattern)
• An asterisk (*) can be used to replace any number of characters (including zero)

Range Matching

A range matching search pattern is used to query for values that are within a range defined by upper and lower boundaries. A range matching search pattern can be inclusive or exclusive of the boundaries. Use square brackets (“[ ]”) to denote inclusive boundaries and curly braces (“{ }”) to denote exclusive boundaries and with the following syntax:

boundary TO boundary

where TO is required (and must be capitalized).

Fuzzy Matching

A fuzzy matching search pattern is used to search based on the proximity of two strings of characters. An (optional) integer may be used as part of the search query to more closely define the proximity. A fuzzy matching search pattern has the following syntax:

"search_query"~edit_distance

where search_query is the string that will be used during the search and edit_distance is the proximity. A tilde (“~”) is used to separate the edit distance from the search query.

About Operators

An operator can be used to ensure that certain terms are included in the results, are excluded from the results, or are not included even when other aspects of the query match. Searches can use the following operators:

Operators must be in ALL CAPS. Parentheses can be used to group clauses and to form sub-queries.

ERROR: knife search failed: invalid search query:
'datacenter%3A123%20AND%20NOT%20hostname%3Adev-%20AND%20NOT%20hostanem%3Asyslog-'
Parse error at offset: 38 Reason: Expected one of \ at line 1, column 42 (byte 42) after AND

$ knife search sample "id:foo AND -id:bar"

Special Characters

A special character can be used to fine-tune a search query and to increase the accuracy of the search results. The following characters can be included within the search query syntax, but each occurrence of a special character must be escaped with a backslash (\):

+  -  &&  | |  !  ( )  { }  [ ]  ^  "  ~  *  ?  :  \

For example:

\(1\+1\)\:2

Reports

Use Reporting to keep track of what happens during the execution of chef-client runs across all of the machines that are under management by Chef. Reports can be generated for the entire organization and they can be generated for specific nodes.

Reporting data is collected during the chef-client run and the results are posted to the Chef server at the end of the chef-client run at the same time the node object is uploaded to the Chef server.

The Chef management console provides ways for users to configure the timeframe around which a report is built, and then to review the reports that are available for that timeframe.

Policy

Policy maps business and operational requirements, process, and workflow to settings and objects stored on the Chef server:

• Roles define server types, such as “web server” or “database server”
• Environments define process, such as “dev”, “staging”, or “production”
• Certain types of data—passwords, user account data, and other sensitive items—can be placed in data bags, which are located in a secure sub-area on the Chef server that can only be accessed by nodes that authenticate to the Chef server with the correct SSL certificates
• The cookbooks (and cookbook versions) in which organization-specific configuration policies are maintained

The Chef management console provides ways for users to manage data bags, environments, roles, cookbooks, clients, and managing tags.

Admin

Organizations, users, and groups can be managed from the Chef management console, including role-based access control for any user and group to any of the objects saved to the Chef server.

The Chef server uses role-based access control (RBAC) to restrict access to objects—nodes, environments, roles, data bags, cookbooks, and so on. This ensures that only authorized user and/or chef-client requests to the Chef server are allowed. Access to objects on the Chef server is fine-grained, allowing access to be defined by object type, object, group, user, and organization. The Chef server uses permissions to define how a user may interact with an object, after they have been authorized to do so.