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The operator pattern aims to capture the key aim of a human operator whois managing a service or set of services. Human operators who look afterspecific applications and services have deep knowledge of how the systemought to behave, how to deploy it, and how to react if there are problems.

People who run workloads on Kubernetes often like to use automation to takecare of repeatable tasks. The operator pattern captures how you can writecode to automate a task beyond what Kubernetes itself provides.

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Kubernetes' operator patternconcept lets you extend the cluster's behaviour without modifying the code of Kubernetesitself by linking controllers toone or more custom resources. Operators are clients of the Kubernetes API that act ascontrollers for a Custom Resource.

The most common way to deploy an operator is to add theCustom Resource Definition and its associated Controller to your cluster.The Controller will normally run outside of thecontrol plane,much as you would run any containerized application.For example, you can run the controller in your cluster as a Deployment.

Once you have an operator deployed, you'd use it by adding, modifying ordeleting the kind of resource that the operator uses. Following the aboveexample, you would set up a Deployment for the operator itself, and then:

The nullish coalescing (??) operator is a logical operator that returns its right-hand side operand when its left-hand side operand is null or undefined, and otherwise returns its left-hand side operand.

The nullish coalescing operator can be seen as a special case of the logical OR (||) operator. The latter returns the right-hand side operand if the left operand is any falsy value, not only null or undefined. In other words, if you use || to provide some default value to another variable foo, you may encounter unexpected behaviors if you consider some falsy values as usable (e.g., '' or 0). See below for more examples.

However, due to || being a boolean logical operator, the left-hand-side operand was coerced to a boolean for the evaluation and any falsy value (including 0, '', NaN, false, etc.) was not returned. This behavior may cause unexpected consequences if you consider 0, '', or NaN as valid values.

The nullish coalescing operator treats undefined and null as specific values. So does the optional chaining operator (?.), which is useful to access a property of an object which may be null or undefined. Combining them, you can safely access a property of an object which may be nullish and provide a default value if it is.

\n The nullish coalescing (??) operator is a logical\n operator that returns its right-hand side operand when its left-hand side operand is\n null or undefined, and otherwise returns its left-hand side\n operand.\n

The operator module exports a set of efficient functions corresponding tothe intrinsic operators of Python. For example, operator.add(x, y) isequivalent to the expression x+y. Many function names are those used forspecial methods, without the double underscores. For backward compatibility,many of these have a variant with the double underscores kept. The variantswithout the double underscores are preferred for clarity.

The operator module also defines tools for generalized attribute and itemlookups. These are useful for making fast field extractors as arguments formap(), sorted(), itertools.groupby(), or other functions thatexpect a function argument.

Operators, by their nature, are application-specific, so the hard work is going to be encoding all of the application operational domain knowledge into a reasonable configuration resource and control loop. There are some common patterns that we have found while building operators that we think are important for any application:

Instead of regular arrow operator (-->) you can use armor-piercing arrow operator: --x> (note those sharp barbs on the arrow tip). It adds +1 to armor piercing, so it finishes the loop 1 iteration faster than regular arrow operator. Try it yourself:

This --> is not an operator at all. We have an operator like ->, but not like -->. It is just a wrong interpretation of while(x-- >0) which simply means x has the post decrement operator and this loop will run till it is greater than zero.

This app was built with JavaScript to provide a fast search experience. The underlying data this app presents is available at -operatorhub/community-operators (and you can contribute new operators there).

The conditional operator ?:, also known as the ternary conditional operator, evaluates a Boolean expression and returns the result of one of the two expressions, depending on whether the Boolean expression evaluates to true or false, as the following example shows:

Use of the conditional operator instead of an if statement might result in more concise code in cases when you need conditionally to compute a value. The following example demonstrates two ways to classify an integer as negative or nonnegative:

When choosing the appropriate value for the operator=* tag, it is beneficial to use exactly the same text including capitalization across all entities managed by the same structure. Please refer to taginfo, or the title of the associated Wikipedia article for the organization as a starting point.

If the vast majority of a certain object in an area is operated by a certain organization and only very few by others then it may be sufficient to only tag the exceptions.

For example, when nearly all roads in an area are managed by a local authority then it would be sufficient to only tag those that are not with an operator tag.

Bus operators may contract or franchise services to a different company (e.g. Flixbus routes, some public transport bus networks). Related infrastructure (stops, bus stations, bus-only roads) may remain under ownership of the transport agency or the bus company itself.

Unlike network=*, operator=* is always a human-readable value. Some operators have been tagged by their legal registration name, while others have been tagged by their trade name. Sometimes mappers abbreviate legal entity types despite the general rule against abbreviations in names. In many cases, rail or public transport companies' names are abbreviated in network=* but spelled out in full in operator=*, with the abbreviation going in operator:short=*.

Organization names are not required to be unique globally. An organization's name may be spelled differently depending on the location, language, or personal preference. To give data consumers and QA tools more certainty when working with operator tags, set operator:wikidata=* to the operator's globally unique, language-independent Wikidata ID. The Name Suggestion Index can help standardize an operator's tags.

Since operator=* should always contain a human-readable value, operator=no should be avoided. A feature that is known to have no operator can sometimes be tagged informal=yes. This tag is often used for social trails, unofficial tent camping sites, and other features found in wilderness areas that are not officially maintained or endorsed by the land management agency, but can be applied to any feature that has not been established on purpose. If informal=yes is not appropriate, operator:type=none can also be used to tag that a feature is specifically known to have no operator.

There are a couple of common subkeys used to add further detail about the operator. These should be used instead of the not prefixed ones if the information given belongs to the operator, but not to the object itself.

Instead of manually installing, upgrading, and uninstalling Istio,you can instead let the Istio operatormanage the installation for you.This relieves you of the burden of managing different istioctl versions.Simply update the operator

The same IstioOperator API is usedto install Istio with the operator as when using the istioctl install instructions.In both cases, configuration is validated against a schema and the same correctnesschecks are performed.

You can configure which namespace the operator controller is installed in, the namespace(s) the operator watches, the installed Istio image sources and versions, and more. For example, you can pass one or more namespaces to watch using the --watchedNamespaces flag:

If you used the operator to perform a canary upgrade of the control plane, you can uninstall the old control plane and keep the new one by deleting the old in-cluster IstioOperator CR, which will uninstall the old revision of Istio:

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