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], url: "/docs/reference/notes/0.1.html", title: "Istio 0.1", order: 50, overview: ""}); docs.push({path: [ "notes", "index.md", ], url: "/docs/reference/notes/", title: "Prior Release Notes", order: 600, overview: "Release notes for prior versions of Istio."}); docs.push({path: [ "release-notes.md", ], url: "/docs/reference/release-notes.html", title: "Release Notes", order: 50, overview: "What's been happening with Istio"}); docs.push({path: [ "release-roadmap.md", ], url: "/docs/reference/release-roadmap.html", title: "Roadmap", order: 60, overview: "What Istio will become in the coming months."}); docs.push({path: [ "writing-config.md", ], url: "/docs/reference/writing-config.html", title: "Writing Configuration", order: 70, overview: "How to write Istio config YAML content."}); genNavBarTree(docs) </script></ul></div><div id="tab-container" class="col-xs-1 tab-neg-margin pull-left"> <a id="sidebar-tab" class="glyphicon glyphicon-chevron-left" href="javascript:void 0;"></a></div><div id="content-container" class="thin-left-border col-sm-9 markdown"><div id="toc" class="toc"></div><div id="doc-content"><h1>Writing Configuration</h1><p>This page describes how to write configuration that conforms to Istio’s schemas. All configuration schemas in Istio are defined as <a href="https://developers.google.com/protocol-buffers/docs/proto3">protobuf messages</a>. When in doubt, search for the protos.</p><h2 id="translating-to-yaml">Translating to YAML</h2><p>There’s an implicit mapping from protobuf to YAML using <a href="https://developers.google.com/protocol-buffers/docs/proto3#json">protobuf’s mapping to JSON</a>. Below are a few examples showing common mappings you’ll encounter writing configuration in Istio.</p><p><strong>Important things to note:</strong></p><ul><li>YAML fields are implicitly strings</li><li>Proto <code>repeated</code> fields map to YAML lists; each element in a YAML list is prefixed by a dash (<code>-</code>)</li><li>Proto <code>message</code>s map to objects; in YAML objects are field names all at the same indentation level</li><li>YAML is whitespace sensitive and must use spaces; tabs are never allowed</li></ul><h3 id="map-and-message-fields"><code>map</code> and <code>message</code> fields</h3><table><tbody><tr><th>Proto</th><th>YAML</th></tr><tr><td><pre>
message Metric {
string descriptor_name = 1;
string value = 2;
map&lt;string, string&gt; labels = 3;
}
</pre></td><td><pre>
descriptorName: request_count
value: "1"
labels:
source: origin.ip
destination: destination.service
</pre></td></tr></tbody></table><p><em>Note that when numeric literals are used as strings (like <code>value</code> above) they must be enclosed in quotes. Quotation marks (<code>"</code>) are optional for normal strings.</em></p><h3 id="repeated-fields"><code>repeated</code> fields</h3><table><tbody><tr><th>Proto</th><th>YAML</th></tr><tr><td><pre>
message Metric {
string descriptor_name = 1;
string value = 2;
map&lt;string, string&gt; labels = 3;
}
message MetricsParams {
repeated Metric metrics = 1;
}
</pre></td><td><pre>
metrics:
- descriptorName: request_count
value: "1"
labels:
source: origin.ip
destination: destination.service
- descriptorName: request_latency
value: response.duration
labels:
source: origin.ip
destination: destination.service
</pre></td></tr></tbody></table><h3 id="enum-fields"><code>enum</code> fields</h3><table><tbody><tr><th>Proto</th><th>YAML</th></tr><tr><td><pre>
enum ValueType {
STRING = 1;
INT64 = 2;
DOUBLE = 3;
// more values omitted
}
message AttributeDescriptor {
string name = 1;
string description = 2;
ValueType value_type = 3;
}
</pre></td><td><pre>
name: request.duration
value_type: INT64
</pre>or<pre>
name: request.duration
valueType: INT64
</pre></td></tr></tbody></table><p><em>Note that YAML parsing will handle both <code>snake_case</code> and <code>lowerCamelCase</code> field names. <code>lowerCamelCase</code> is the canonical version in YAML.</em></p><h3 id="nested-message-fields">Nested <code>message</code> fields</h3><table><tbody><tr><th>Proto</th><th>YAML</th></tr><tr><td><pre>
enum ValueType {
STRING = 1;
INT64 = 2;
DOUBLE = 3;
// more values omitted
}
message LabelDescriptor {
string name = 1;
string description = 2;
ValueType value_type = 3;
}
message MonitoredResourceDescriptor {
string name = 1;
string description = 2;
repeated LabelDescriptor labels = 3;
}
</pre></td><td><pre>
name: My Monitored Resource
labels:
- name: label one
valueType: STRING
- name: second label
valueType: DOUBLE
</pre></td></tr></tbody></table><h3 id="timestamp-duration-and-64-bit-integer-fields"><code>Timestamp</code>, <code>Duration</code>, and 64 bit integer fields</h3><p>The protobuf spec special cases the JSON/YAML representations of a few well-known protobuf messages. 64 bit integer types are also special due to the fact that JSON numbers are implicitly doubles, which cannot represent all valid 64 bit integer values.</p><table><tbody><tr><th>Proto</th><th>YAML</th></tr><tr><td><pre>
message Quota {
string descriptor_name = 1;
map&lt;string, string&gt; labels = 2;
int64 max_amount = 3;
google.protobuf.Duration expiration = 4;
}
</pre></td><td><pre>
descriptorName: RequestCount
labels:
label one: STRING
second label: DOUBLE
maxAmount: "7"
expiration: 1.000340012s
</pre></td></tr></tbody></table><p>Specifically, the <a href="https://developers.google.com/protocol-buffers/docs/proto3#json">protobuf spec declares</a>:</p><table><thead><tr><th>Proto</th><th>JSON/YAML</th><th>Example</th><th>Notes</th></tr></thead><tbody><tr><td>Timestamp</td><td>string</td><td>“1972-01-01T10:00:20.021Z”</td><td>Uses RFC 3339, where generated output will always be Z-normalized and uses 0, 3, 6 or 9 fractional digits.</td></tr><tr><td>Duration</td><td>string</td><td>“1.000340012s”, “1s”</td><td>Generated output always contains 0, 3, 6, or 9 fractional digits, depending on required precision. Accepted are any fractional digits (also none) as long as they fit into nano-seconds precision.</td></tr><tr><td>int64, fixed64, uint64</td><td>string</td><td>“1”, “-10”</td><td>JSON value will be a decimal string. Either numbers or strings are accepted.</td></tr></tbody></table><h2 id="whats-next">What’s next</h2><ul><li>TODO: link to overall mixer config concept guide (how the config pieces fit together)</li></ul></div></div></div></div></div></div><script src="/v0.2/js/sidemenu.js"></script><footer><div class="container"><div class="row"><div class="col-md-2"></div><div class="col-md-3 col-sm-4 col-xs-12 center-block"><ul class="toggle"><p class="header">Docs</p><li><a href="/v0.2/docs/">Welcome</a></li><li><a href="/v0.2/docs/concepts">Concepts</a></li><li><a href="/v0.2/docs/setup">Setup</a></li><li><a href="/v0.2/docs/tasks">Tasks</a></li><li><a href="/v0.2/docs/guides">Guides</a></li><li><a href="/v0.2/docs/reference">Reference</a></li></ul></div><hr class="footer-sections" /><div class="col-md-3 col-sm-4 col-xs-12 center-block"><ul class="toggle"><p class="header">Resources</p><li><a href="/v0.2/faq">Frequently Asked Questions</a></li><li><a href="/v0.2/troubleshooting">Troubleshooting Guide</a></li><li><a href="/v0.2/bugs">Report a Bug</a></li><li><a href="https://github.com/istio/istio.github.io/issues/new?title=Issue with _docs/reference/writing-config.md">Report a Doc Issue</a></li><li><a href="https://github.com/istio/istio.github.io/edit/master/_docs/reference/writing-config.md">Edit This Page on GitHub</a></li></ul></div><hr class="footer-sections" /><div class="col-md-3 col-sm-4 col-xs-12 center-block"><ul class="toggle"><p class="header">Community</p><li><a href="https://groups.google.com/forum/#!forum/istio-users" target="_blank"><span class="group">User</span></a> | <a href="https://groups.google.com/forum/#!forum/istio-dev" target="_blank">Dev</a> | <a href="https://github.com/istio/istio/blob/master/GROUPS.md#working-groups" target="_blank">Working Group Lists</a></li><li><a href="https://twitter.com/IstioMesh" target="_blank"><span class="twitter">Twitter</span></a></li><li><a href="https://github.com/istio/istio" target="_blank"><span class="github">GitHub</span></a></li></ul></div><div class="col-md-1"></div></div><div class="row"><p class="description small text-center"> Istio 0.2, Copyright &copy; 2017 Istio Authors<br> Archived on 12-Nov-2017</p></div></div></footer><script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.15.0/jquery.validate.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.form/4.2.1/jquery.form.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-visible/1.2.0/jquery.visible.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.6.0/slick.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/1.7.1/clipboard.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> <script src="/v0.2/js/common.js"></script> <script src="/v0.2/js/buttons.js"></script> <script src="/v0.2/js/search.js"></script> <script src="/v0.2/js/prism.js"></script></body></html>
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