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client/docs/cmd/kn_service_update.md

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## kn service update
Update a service.
### Synopsis
Update a service.
```
kn service update NAME [flags]
```
### Examples
```
# Updates a service 'svc' with new environment variables
kn service update svc --env KEY1=VALUE1 --env KEY2=VALUE2
# Update a service 'svc' with new port
kn service update svc --port 80
# Updates a service 'svc' with new request and limit parameters
kn service update svc --request cpu=500m --limit memory=1024Mi --limit cpu=1000m
# Assign tag 'latest' and 'stable' to revisions 'echo-v2' and 'echo-v1' respectively
kn service update svc --tag echo-v2=latest --tag echo-v1=stable
OR
kn service update svc --tag echo-v2=latest,echo-v1=stable
# Update tag from 'testing' to 'staging' for latest ready revision of service
kn service update svc --untag testing --tag @latest=staging
# Add tag 'test' to echo-v3 revision with 10% traffic and rest to latest ready revision of service
kn service update svc --tag echo-v3=test --traffic test=10,@latest=90
```
### Options
```
-a, --annotation stringArray Service annotation to set. name=value; you may provide this flag any number of times to set multiple annotations. To unset, specify the annotation name followed by a "-" (e.g., name-).
--arg stringArray Add argument to the container command. Example: --arg myArg1 --arg --myArg2 --arg myArg3=3. You can use this flag multiple times.
--async DEPRECATED: please use --no-wait instead. Do not wait for 'service update' operation to be completed.
--autoscale-window string Duration to look back for making auto-scaling decisions. The service is scaled to zero if no request was received in during that time. (eg: 10s)
--cluster-local Specify that the service be private. (--no-cluster-local will make the service publicly available)
--cmd string Specify command to be used as entrypoint instead of default one. Example: --cmd /app/start or --cmd /app/start --arg myArg to pass aditional arguments.
--concurrency-limit int Hard Limit of concurrent requests to be processed by a single replica.
--concurrency-target int Recommendation for when to scale up based on the concurrent number of incoming request. Defaults to --concurrency-limit when given.
--concurrency-utilization int Percentage of concurrent requests utilization before scaling up. (default 70)
-e, --env stringArray Environment variable to set. NAME=value; you may provide this flag any number of times to set multiple environment variables. To unset, specify the environment variable name followed by a "-" (e.g., NAME-).
--env-from stringArray Add environment variables from a ConfigMap (prefix cm: or config-map:) or a Secret (prefix secret:). Example: --env-from cm:myconfigmap or --env-from secret:mysecret. You can use this flag multiple times. To unset a ConfigMap/Secret reference, append "-" to the name, e.g. --env-from cm:myconfigmap-.
-h, --help help for update
--image string Image to run.
-l, --label stringArray Labels to set for both Service and Revision. name=value; you may provide this flag any number of times to set multiple labels. To unset, specify the label name followed by a "-" (e.g., name-).
--label-revision stringArray Revision label to set. name=value; you may provide this flag any number of times to set multiple labels. To unset, specify the label name followed by a "-" (e.g., name-). This flag takes precedence over "label" flag.
--label-service stringArray Service label to set. name=value; you may provide this flag any number of times to set multiple labels. To unset, specify the label name followed by a "-" (e.g., name-). This flag takes precedence over "label" flag.
--limit strings The resource requirement limits for this Service. For example, 'cpu=100m,memory=256Mi'. You can use this flag multiple times. To unset a resource limit, append "-" to the resource name, e.g. '--limit memory-'.
--limits-cpu string DEPRECATED: please use --limit instead. The limits on the requested CPU (e.g., 1000m).
--limits-memory string DEPRECATED: please use --limit instead. The limits on the requested memory (e.g., 1024Mi).
--lock-to-digest Keep the running image for the service constant when not explicitly specifying the image. (--no-lock-to-digest pulls the image tag afresh with each new revision) (default true)
--max-scale int Maximal number of replicas.
--min-scale int Minimal number of replicas.
--mount stringArray Mount a ConfigMap (prefix cm: or config-map:), a Secret (prefix secret: or sc:), or an existing Volume (without any prefix) on the specified directory. Example: --mount /mydir=cm:myconfigmap, --mount /mydir=secret:mysecret, or --mount /mydir=myvolume. When a configmap or a secret is specified, a corresponding volume is automatically generated. You can use this flag multiple times. For unmounting a directory, append "-", e.g. --mount /mydir-, which also removes any auto-generated volume.
-n, --namespace string Specify the namespace to operate in.
--no-cluster-local Do not specify that the service be private. (--no-cluster-local will make the service publicly available) (default true)
--no-lock-to-digest Do not keep the running image for the service constant when not explicitly specifying the image. (--no-lock-to-digest pulls the image tag afresh with each new revision)
--no-wait Do not wait for 'service update' operation to be completed.
-p, --port int32 The port where application listens on.
--pull-secret string Image pull secret to set. An empty argument ("") clears the pull secret. The referenced secret must exist in the service's namespace.
--request strings The resource requirement requests for this Service. For example, 'cpu=100m,memory=256Mi'. You can use this flag multiple times. To unset a resource request, append "-" to the resource name, e.g. '--request cpu-'.
--requests-cpu string DEPRECATED: please use --request instead. The requested CPU (e.g., 250m).
--requests-memory string DEPRECATED: please use --request instead. The requested memory (e.g., 64Mi).
--revision-name string The revision name to set. Must start with the service name and a dash as a prefix. Empty revision name will result in the server generating a name for the revision. Accepts golang templates, allowing {{.Service}} for the service name, {{.Generation}} for the generation, and {{.Random [n]}} for n random consonants. (default "{{.Service}}-{{.Random 5}}-{{.Generation}}")
--service-account string Service account name to set. An empty argument ("") clears the service account. The referenced service account must exist in the service's namespace.
--tag strings Set tag (format: --tag revisionRef=tagName) where revisionRef can be a revision or '@latest' string representing latest ready revision. This flag can be specified multiple times.
--traffic strings Set traffic distribution (format: --traffic revisionRef=percent) where revisionRef can be a revision or a tag or '@latest' string representing latest ready revision. This flag can be given multiple times with percent summing up to 100%.
--untag strings Untag revision (format: --untag tagName). This flag can be specified multiple times.
--user int The user ID to run the container (e.g., 1001).
--volume stringArray Add a volume from a ConfigMap (prefix cm: or config-map:) or a Secret (prefix secret: or sc:). Example: --volume myvolume=cm:myconfigmap or --volume myvolume=secret:mysecret. You can use this flag multiple times. To unset a ConfigMap/Secret reference, append "-" to the name, e.g. --volume myvolume-.
--wait Wait for 'service update' operation to be completed. (default true)
--wait-timeout int Seconds to wait before giving up on waiting for service to be ready. (default 600)
```
### Options inherited from parent commands
```
--config string kn config file (default is ~/.config/kn/config.yaml)
--kubeconfig string kubectl config file (default is ~/.kube/config)
--log-http log http traffic
```
### SEE ALSO
* [kn service](kn_service.md) - Service command group
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