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Introduction
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Usage overview
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Arguments
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Arguments
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Debug
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Trace
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Docker host
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Docker API version
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Include stopped
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Poll interval
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Filter by disable label
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Without updating containers
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⚠️ Please note
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Without restarting containers
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Without pulling new images
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Without sending a startup message
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Run once
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HTTP API Mode
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HTTP API Token
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Scheduling
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Rolling restart
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Wait until timeout
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TLS Verification
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Notifications
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Container selection
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Private registries
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Linked containers
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Remote hosts
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Secure connections
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Stop signals
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Lifecycle hooks
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Running multiple instances
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Table of contents
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Help
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Time Zone
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Cleanup
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< a href = "#remove_attached_volumes" class = "md-nav__link" >
Remove attached volumes
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Debug
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Trace
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ANSI colors
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Docker host
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Docker API version
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Include stopped
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Revive stopped
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Poll interval
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Filter by enable label
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Filter by disable label
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Without updating containers
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⚠️ Please note
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Without restarting containers
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Without pulling new images
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Without sending a startup message
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Run once
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HTTP API Mode
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HTTP API Token
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Filter by scope
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< h1 > Arguments< / h1 >
< p > By default, watchtower will monitor all containers running within the Docker daemon to which it is pointed (in most cases this
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will be the local Docker daemon, but you can override it with the < code > --host< / code > option described in the next section). However, you
can restrict watchtower to monitoring a subset of the running containers by specifying the container names as arguments when
launching watchtower.< / p >
< pre > < code class = "bash" > $ docker run -d \
--name watchtower \
-v /var/run/docker.sock:/var/run/docker.sock \
containrrr/watchtower \
nginx redis
< / code > < / pre >
< p > In the example above, watchtower will only monitor the containers named "nginx" and "redis" for updates -- all of the other
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running containers will be ignored. If you do not want watchtower to run as a daemon you can pass the < code > --run-once< / code > flag and remove
the watchtower container after its execution.< / p >
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< pre > < code class = "bash" > $ docker run --rm \
-v /var/run/docker.sock:/var/run/docker.sock \
containrrr/watchtower \
--run-once \
nginx redis
< / code > < / pre >
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< p > In the example above, watchtower will execute an upgrade attempt on the containers named "nginx" and "redis". Using this mode will enable debugging output showing all actions performed, as usage is intended for interactive users. Once the attempt is completed, the container will exit and remove itself due to the < code > --rm< / code > flag.< / p >
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< p > When no arguments are specified, watchtower will monitor all running containers.< / p >
< h2 id = "help" > Help< a class = "headerlink" href = "#help" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Shows documentation about the supported flags.< / p >
< pre > < code > Argument: --help
Environment Variable: N/A
Type: N/A
Default: N/A
< / code > < / pre >
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< h2 id = "time_zone" > Time Zone< a class = "headerlink" href = "#time_zone" title = "Permanent link" > ¶ < / a > < / h2 >
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< p > Sets the time zone to be used by WatchTower's logs and the optional Cron scheduling argument (--schedule). If this environment variable is not set, Watchtower will use the default time zone: UTC.
To find out the right value, see < a href = "https://en.wikipedia.org/wiki/List_of_tz_database_time_zones" > this list< / a > , find your location and use the value in < em > TZ Database Name< / em > , e.g < em > Europe/Rome< / em > . The timezome can alternatively be set by volume mounting your hosts /etc/timezone file. < code > -v /etc/timezone:/etc/timezone:ro< / code > < / p >
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< pre > < code > Argument: N/A
Environment Variable: TZ
Type: String
Default: " UTC"
< / code > < / pre >
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< h2 id = "cleanup" > Cleanup< a class = "headerlink" href = "#cleanup" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Removes old images after updating. When this flag is specified, watchtower will remove the old image after restarting a container with a new image. Use this option to prevent the accumulation of orphaned images on your system as containers are updated.< / p >
< pre > < code > Argument: --cleanup
Environment Variable: WATCHTOWER_CLEANUP
Type: Boolean
Default: false
< / code > < / pre >
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< h2 id = "remove_attached_volumes" > Remove attached volumes< a class = "headerlink" href = "#remove_attached_volumes" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Removes attached volumes after updating. When this flag is specified, watchtower will remove all attached volumes from the container before restarting with a new image. Use this option to force new volumes to be populated as containers are updated.< / p >
< pre > < code > Argument: --remove-volumes
Environment Variable: WATCHTOWER_REMOVE_VOLUMES
Type: Boolean
Default: false
< / code > < / pre >
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< h2 id = "debug" > Debug< a class = "headerlink" href = "#debug" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Enable debug mode with verbose logging.< / p >
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< pre > < code > Argument: --debug, -d
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Environment Variable: WATCHTOWER_DEBUG
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Type: Boolean
Default: false
< / code > < / pre >
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< h2 id = "trace" > Trace< a class = "headerlink" href = "#trace" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Enable trace mode with very verbose logging. Caution: exposes credentials!< / p >
< pre > < code > Argument: --trace
Environment Variable: WATCHTOWER_TRACE
Type: Boolean
Default: false
< / code > < / pre >
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< h2 id = "ansi_colors" > ANSI colors< a class = "headerlink" href = "#ansi_colors" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Disable ANSI color escape codes in log output.< / p >
< pre > < code > Argument: --no-color
Environment Variable: NO_COLOR
Type: Boolean
Default: false
< / code > < / pre >
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< h2 id = "docker_host" > Docker host< a class = "headerlink" href = "#docker_host" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Docker daemon socket to connect to. Can be pointed at a remote Docker host by specifying a TCP endpoint as "tcp://hostname:port".< / p >
< pre > < code > Argument: --host, -h
Environment Variable: DOCKER_HOST
Type: String
Default: " unix:///var/run/docker.sock"
< / code > < / pre >
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< h2 id = "docker_api_version" > Docker API version< a class = "headerlink" href = "#docker_api_version" title = "Permanent link" > ¶ < / a > < / h2 >
< p > The API version to use by the Docker client for connecting to the Docker daemon. The minimum supported version is 1.24.< / p >
< pre > < code > Argument: --api-version, -a
Environment Variable: DOCKER_API_VERSION
Type: String
Default: " 1.24"
< / code > < / pre >
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< h2 id = "include_stopped" > Include stopped< a class = "headerlink" href = "#include_stopped" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Will also include created and exited containers.< / p >
< pre > < code > Argument: --include-stopped
Environment Variable: WATCHTOWER_INCLUDE_STOPPED
Type: Boolean
Default: false
< / code > < / pre >
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< h2 id = "revive_stopped" > Revive stopped< a class = "headerlink" href = "#revive_stopped" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Start any stopped containers that have had their image updated. This argument is only usable with the < code > --include-stopped< / code > argument.< / p >
< pre > < code > Argument: --revive-stopped
Environment Variable: WATCHTOWER_REVIVE_STOPPED
Type: Boolean
Default: false
< / code > < / pre >
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< h2 id = "poll_interval" > Poll interval< a class = "headerlink" href = "#poll_interval" title = "Permanent link" > ¶ < / a > < / h2 >
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< p > Poll interval (in seconds). This value controls how frequently watchtower will poll for new images. Either < code > --schedule< / code > or a poll interval can be defined, but not both.< / p >
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< pre > < code > Argument: --interval, -i
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Environment Variable: WATCHTOWER_POLL_INTERVAL
Type: Integer
Default: 300
< / code > < / pre >
< h2 id = "filter_by_enable_label" > Filter by enable label< a class = "headerlink" href = "#filter_by_enable_label" title = "Permanent link" > ¶ < / a > < / h2 >
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< p > Update containers that have a < code > com.centurylinklabs.watchtower.enable< / code > label set to true.< / p >
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< pre > < code > Argument: --label-enable
Environment Variable: WATCHTOWER_LABEL_ENABLE
Type: Boolean
Default: false
< / code > < / pre >
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< h2 id = "filter_by_disable_label" > Filter by disable label< a class = "headerlink" href = "#filter_by_disable_label" title = "Permanent link" > ¶ < / a > < / h2 >
< p > < strong > Do not< / strong > update containers that have < code > com.centurylinklabs.watchtower.enable< / code > label set to false and no < code > --label-enable< / code > argument is passed. Note that only one or the other (targeting by enable label) can be used at the same time to target containers.< / p >
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< h2 id = "without_updating_containers" > Without updating containers< a class = "headerlink" href = "#without_updating_containers" title = "Permanent link" > ¶ < / a > < / h2 >
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< p > Will only monitor for new images, send notifications and invoke the < a href = "https://containrrr.dev/watchtower/lifecycle-hooks/" > pre-check/post-check hooks< / a > , but will < strong > not< / strong > update the containers.< / p >
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< blockquote >
< h3 id = "please_note" > ⚠️ Please note< a class = "headerlink" href = "#please_note" title = "Permanent link" > ¶ < / a > < / h3 >
< p > Due to Docker API limitations the latest image will still be pulled from the registry.< / p >
< / blockquote >
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< pre > < code > Argument: --monitor-only
Environment Variable: WATCHTOWER_MONITOR_ONLY
Type: Boolean
Default: false
< / code > < / pre >
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< p > Note that monitor-only can also be specified on a per-container basis with the < code > com.centurylinklabs.watchtower.monitor-only< / code > label set on those containers.< / p >
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< h2 id = "without_restarting_containers" > Without restarting containers< a class = "headerlink" href = "#without_restarting_containers" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Do not restart containers after updating. This option can be useful when the start of the containers
is managed by an external system such as systemd.< / p >
< pre > < code > Argument: --no-restart
Environment Variable: WATCHTOWER_NO_RESTART
Type: Boolean
Default: false
< / code > < / pre >
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< h2 id = "without_pulling_new_images" > Without pulling new images< a class = "headerlink" href = "#without_pulling_new_images" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Do not pull new images. When this flag is specified, watchtower will not attempt to pull
new images from the registry. Instead it will only monitor the local image cache for changes.
Use this option if you are building new images directly on the Docker host without pushing
them to a registry.< / p >
< pre > < code > Argument: --no-pull
Environment Variable: WATCHTOWER_NO_PULL
Type: Boolean
Default: false
< / code > < / pre >
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< h2 id = "without_sending_a_startup_message" > Without sending a startup message< a class = "headerlink" href = "#without_sending_a_startup_message" title = "Permanent link" > ¶ < / a > < / h2 >
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< p > Do not send a message after watchtower started. Otherwise there will be an info-level notification.< / p >
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< pre > < code > Argument: --no-startup-message
Environment Variable: WATCHTOWER_NO_STARTUP_MESSAGE
Type: Boolean
Default: false
< / code > < / pre >
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< h2 id = "run_once" > Run once< a class = "headerlink" href = "#run_once" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Run an update attempt against a container name list one time immediately and exit.< / p >
< pre > < code > Argument: --run-once
Environment Variable: WATCHTOWER_RUN_ONCE
Type: Boolean
Default: false
< / code > < / pre >
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< h2 id = "http_api_mode" > HTTP API Mode< a class = "headerlink" href = "#http_api_mode" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Runs Watchtower in HTTP API mode, only allowing image updates to be triggered by an HTTP request.< / p >
< pre > < code > Argument: --http-api
Environment Variable: WATCHTOWER_HTTP_API
Type: Boolean
Default: false
< / code > < / pre >
< h2 id = "http_api_token" > HTTP API Token< a class = "headerlink" href = "#http_api_token" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Sets an authentication token to HTTP API requests.< / p >
< pre > < code > Argument: --http-api-token
Environment Variable: WATCHTOWER_HTTP_API_TOKEN
Type: String
Default: -
< / code > < / pre >
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< h2 id = "filter_by_scope" > Filter by scope< a class = "headerlink" href = "#filter_by_scope" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Update containers that have a < code > com.centurylinklabs.watchtower.scope< / code > label set with the same value as the given argument. This enables < a href = "https://containrrr.github.io/watchtower/running-multiple-instances" > running multiple instances< / a > .< / p >
< pre > < code > Argument: --scope
Environment Variable: WATCHTOWER_SCOPE
Type: String
Default: -
< / code > < / pre >
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< h2 id = "scheduling" > Scheduling< a class = "headerlink" href = "#scheduling" title = "Permanent link" > ¶ < / a > < / h2 >
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< p > < a href = "https://pkg.go.dev/github.com/robfig/cron@v1.2.0?tab=doc#hdr-CRON_Expression_Format" > Cron expression< / a > in 6 fields (rather than the traditional 5) which defines when and how often to check for new images. Either < code > --interval< / code > or the schedule expression
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can be defined, but not both. An example: < code > --schedule "0 0 4 * * *"< / code > < / p >
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< pre > < code > Argument: --schedule, -s
Environment Variable: WATCHTOWER_SCHEDULE
Type: String
Default: -
< / code > < / pre >
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< h2 id = "rolling_restart" > Rolling restart< a class = "headerlink" href = "#rolling_restart" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Restart one image at time instead of stopping and starting all at once. Useful in conjunction with lifecycle hooks
to implement zero-downtime deploy.< / p >
< pre > < code > Argument: --rolling-restart
Environment Variable: WATCHTOWER_ROLLING_RESTART
Type: Boolean
Default: false
< / code > < / pre >
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< h2 id = "wait_until_timeout" > Wait until timeout< a class = "headerlink" href = "#wait_until_timeout" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Timeout before the container is forcefully stopped. When set, this option will change the default (< code > 10s< / code > ) wait time to the given value. An example: < code > --stop-timeout 30s< / code > will set the timeout to 30 seconds.< / p >
< pre > < code > Argument: --stop-timeout
Environment Variable: WATCHTOWER_TIMEOUT
Type: Duration
Default: 10s
< / code > < / pre >
< h2 id = "tls_verification" > TLS Verification< a class = "headerlink" href = "#tls_verification" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Use TLS when connecting to the Docker socket and verify the server's certificate. See below for options used to configure notifications.< / p >
< pre > < code > Argument: --tlsverify
Environment Variable: DOCKER_TLS_VERIFY
Type: Boolean
Default: false
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Material for MkDocs
< / a >
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< / footer >
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< script src = "../assets/javascripts/vendor.77e55a48.min.js" > < / script >
< script src = "../assets/javascripts/bundle.aa3f9871.min.js" > < / script > < script id = "__lang" type = "application/json" > { "clipboard.copy" : "Copy to clipboard" , "clipboard.copied" : "Copied to clipboard" , "search.config.lang" : "en" , "search.config.pipeline" : "trimmer, stopWordFilter" , "search.config.separator" : "[\\s\\-]+" , "search.result.placeholder" : "Type to start searching" , "search.result.none" : "No matching documents" , "search.result.one" : "1 matching document" , "search.result.other" : "# matching documents" , "search.result.more.one" : "1 more on this page" , "search.result.more.other" : "# more on this page" , "search.result.term.missing" : "Missing" } < / script >
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< script >
app = initialize({
base: "..",
features: [],
search: Object.assign({
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worker: "../assets/javascripts/worker/search.4ac00218.min.js"
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}, typeof search !== "undefined" & & search)
})
< / script >
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< / body >
< / html >
