<!doctype html> < html lang = "en" class = "no-js" > < head > < meta charset = "utf-8" > < meta name = "viewport" content = "width=device-width,initial-scale=1" > < meta http-equiv = "x-ua-compatible" content = "ie=edge" > < link rel = "canonical" href = "http://containrrr.github.io/watchtower/usage-overview/" > < meta name = "lang:clipboard.copy" content = "Copy to clipboard" > < meta name = "lang:clipboard.copied" content = "Copied to clipboard" > < meta name = "lang:search.language" content = "en" > < meta name = "lang:search.pipeline.stopwords" content = "True" > < meta name = "lang:search.pipeline.trimmer" content = "True" > < meta name = "lang:search.result.none" content = "No matching documents" > < meta name = "lang:search.result.one" content = "1 matching document" > < meta name = "lang:search.result.other" content = "# matching documents" > < meta name = "lang:search.tokenizer" content = "[\s\-]+" > < link rel = "shortcut icon" href = "../assets/images/favicon.png" > < meta name = "generator" content = "mkdocs-1.0.4, mkdocs-material-4.3.1" > < title > Usage overview - Watchtower< / title > < link rel = "stylesheet" href = "../assets/stylesheets/application.4031d38b.css" > < script src = "../assets/javascripts/modernizr.74668098.js" > < / script > < link href = "https://fonts.gstatic.com" rel = "preconnect" crossorigin > < link rel = "stylesheet" href = "https://fonts.googleapis.com/css?family=Roboto:300,400,400i,700|Roboto+Mono&display=swap" > < style > body , input { font-family : "Roboto" , "Helvetica Neue" , Helvetica , Arial , sans-serif } code , kbd , pre { font-family : "Roboto Mono" , "Courier New" , Courier , monospace } < / style > < link rel = "stylesheet" href = "../assets/fonts/material-icons.css" > < / head > < body dir = "ltr" > < svg class = "md-svg" > < defs > < svg xmlns = "http://www.w3.org/2000/svg" width = "416" height = "448" viewBox = "0 0 416 448" id = "__github" > < path fill = "currentColor" d = "M160 304q0 10-3.125 20.5t-10.75 19T128 352t-18.125-8.5-10.75-19T96 304t3.125-20.5 10.75-19T128 256t18.125 8.5 10.75 19T160 304zm160 0q0 10-3.125 20.5t-10.75 19T288 352t-18.125-8.5-10.75-19T256 304t3.125-20.5 10.75-19T288 256t18.125 8.5 10.75 19T320 304zm40 0q0-30-17.25-51T296 232q-10.25 0-48.75 5.25Q229.5 240 208 240t-39.25-2.75Q130.75 232 120 232q-29.5 0-46.75 21T56 304q0 22 8 38.375t20.25 25.75 30.5 15 35 7.375 37.25 1.75h42q20.5 0 37.25-1.75t35-7.375 30.5-15 20.25-25.75T360 304zm56-44q0 51.75-15.25 82.75-9.5 19.25-26.375 33.25t-35.25 21.5-42.5 11.875-42.875 5.5T212 416q-19.5 0-35.5-.75t-36.875-3.125-38.125-7.5-34.25-12.875T37 371.5t-21.5-28.75Q0 312 0 260q0-59.25 34-99-6.75-20.5-6.75-42.5 0-29 12.75-54.5 27 0 47.5 9.875t47.25 30.875Q171.5 96 212 96q37 0 70 8 26.25-20.5 46.75-30.25T376 64q12.75 25.5 12.75 54.5 0 21.75-6.75 42 34 40 34 99.5z" / > < / svg > < / defs > < / svg > < input class = "md-toggle" data-md-toggle = "drawer" type = "checkbox" id = "__drawer" autocomplete = "off" > < input class = "md-toggle" data-md-toggle = "search" type = "checkbox" id = "__search" autocomplete = "off" > < label class = "md-overlay" data-md-component = "overlay" for = "__drawer" > < / label > < header class = "md-header" data-md-component = "header" > < nav class = "md-header-nav md-grid" > < div class = "md-flex" > < div class = "md-flex__cell md-flex__cell--shrink" > < a href = "http://containrrr.github.io/watchtower/" title = "Watchtower" class = "md-header-nav__button md-logo" > < i class = "md-icon" > < / i > < / a > < / div > < div class = "md-flex__cell md-flex__cell--shrink" > < label class = "md-icon md-icon--menu md-header-nav__button" for = "__drawer" > < / label > < / div > < div class = "md-flex__cell md-flex__cell--stretch" > < div class = "md-flex__ellipsis md-header-nav__title" data-md-component = "title" > < span class = "md-header-nav__topic" > Watchtower< / span > < span class = "md-header-nav__topic" > Usage overview< / span > < / div > < / div > < div class = "md-flex__cell md-flex__cell--shrink" > < label class = "md-icon md-icon--search md-header-nav__button" for = "__search" > < / label > < div class = "md-search" data-md-component = "search" role = "dialog" > < label class = "md-search__overlay" for = "__search" > < / label > < div class = "md-search__inner" role = "search" > < form class = "md-search__form" name = "search" > < input type = "text" class = "md-search__input" name = "query" placeholder = "Search" autocapitalize = "off" autocorrect = "off" autocomplete = "off" spellcheck = "false" data-md-component = "query" d
< p > Since the watchtower code needs to interact with the Docker API in order to monitor the running containers, you need to mount < em > /var/run/docker.sock< / em > into the container with the -v flag when you run it.< / p >
< p > Run the < code > watchtower< / code > container with the following command:< / p >
< pre > < code class = "bash" > docker run -d \
--name watchtower \
-v /var/run/docker.sock:/var/run/docker.sock \
containrrr/watchtower
< / code > < / pre >
< p > If pulling images from private Docker registries, supply registry authentication credentials with the environment variables < code > REPO_USER< / code > and < code > REPO_PASS< / code >
or by mounting the host's docker config file into the container (at the root of the container filesystem < code > /< / code > ).< / p >
< p > Passing environment variables:< / p >
< pre > < code class = "bash" > docker run -d \
--name watchtower \
-e REPO_USER=username \
-e REPO_PASS=password \
-v /var/run/docker.sock:/var/run/docker.sock \
containrrr/watchtower container_to_watch --debug
< / code > < / pre >
< p > Also check out < a href = "https://stackoverflow.com/a/30494145/7872793" > this Stack Overflow answer< / a > for more options on how to pass environment variables.< / p >
< p > Mounting the host's docker config file:< / p >
< pre > < code class = "bash" > docker run -d \
--name watchtower \
-v /home/< user> /.docker/config.json:/config.json \
-v /var/run/docker.sock:/var/run/docker.sock \
containrrr/watchtower container_to_watch --debug
< / code > < / pre >
< p > If you mount the config file as described above, be sure to also prepend the url for the registry when starting up your watched image (you can omit the https://). Here is a complete docker-compose.yml file that starts up a docker container from a private repo at dockerhub and monitors it with watchtower. Note the command argument changing the interval to 30s rather than the default 5 minutes.< / p >
< pre > < code class = "json" > version: " 3"
services:
cavo:
image: index.docker.io/< org> /< image> :< tag>
ports:
- " 443:3443"
- " 80:3080"
watchtower:
image: containrrr/watchtower
volumes:
- /var/run/docker.sock:/var/run/docker.sock
- /root/.docker/config.json:/config.json
command: --interval 30
< / code > < / pre > < / article > < / div > < / div > < / main > < footer class = "md-footer" > < div class = "md-footer-nav" > < nav class = "md-footer-nav__inner md-grid" > < a href = "../introduction/" title = "Introduction" class = "md-flex md-footer-nav__link md-footer-nav__link--prev" rel = "prev" > < div class = "md-flex__cell md-flex__cell--shrink" > < i class = "md-icon md-icon--arrow-back md-footer-nav__button" > < / i > < / div > < div class = "md-flex__cell md-flex__cell--stretch md-footer-nav__title" > < span class = "md-flex__ellipsis" > < span class = "md-footer-nav__direction" > Previous< / span > Introduction< / span > < / div > < / a > < a href = "../arguments/" title = "Arguments" class = "md-flex md-footer-nav__link md-footer-nav__link--next" rel = "next" > < div class = "md-flex__cell md-flex__cell--stretch md-footer-nav__title" > < span class = "md-flex__ellipsis" > < span class = "md-footer-nav__direction" > Next< / span > Arguments< / span > < / div > < div class = "md-flex__cell md-flex__cell--shrink" > < i class = "md-icon md-icon--arrow-forward md-footer-nav__button" > < / i > < / div > < / a > < / nav > < / div > < div class = "md-footer-meta md-typeset" > < div class = "md-footer-meta__inner md-grid" > < div class = "md-footer-copyright" > powered by < a href = "https://www.mkdocs.org" > MkDocs< / a > and < a href = "https://squidfunk.github.io/mkdocs-material/" > Material for MkDocs< / a > < / div > < / div > < / div > < / footer > < / div > < script src = "../assets/javascripts/application.b260a35d.js" > < / script > < script > app . initialize ( { version : "1.0.4" , url : { base : ".." } } ) < / script > < / body > < / html >
