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 [this list](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones), find your location and use the value in _TZ Database Name_, e.g _Europe/Rome_.
To find out the right value, see [this list](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones), find your location and use the value in _TZ Database Name_, e.g _Europe/Rome_. The timezome can alternatively be set by volume mounting your hosts /etc/timezone file. `-v /etc/timezone:/etc/timezone:ro`
Poll interval (in seconds). This value controls how frequently watchtower will poll for new images.
Poll interval (in seconds). This value controls how frequently watchtower will poll for new images. Either `--schedule` or a poll interval can be defined, but not both.
[Cron expression](https://godoc.org/github.com/robfig/cron#hdr-CRON_Expression_Format) in 6 fields (rather than the traditional 5) which defines when and how often to check for new images. Either `--interval` or the schedule expression could be defined, but not both. An example: `--schedule "0 0 4 * * *"`
[Cron expression](https://pkg.go.dev/github.com/robfig/cron@v1.2.0?tab=doc#hdr-CRON_Expression_Format) in 6 fields (rather than the traditional 5) which defines when and how often to check for new images. Either `--interval` or the schedule expression
can be defined, but not both. An example: `--schedule "0 0 4 * * *"`
@ -12,7 +12,7 @@ Or, it can be specified as part of the `docker run` command line:
docker run -d --label=com.centurylinklabs.watchtower.enable=false someimage
```
If you need to include only some containers, pass the `--label-enable` flag on startup and set the _com.centurylinklabs.watchtower.enable_ label with a value of `true` for the containers you want to watch.
If you need to [include only containers with the enable label](https://containrrr.github.io/watchtower/arguments/#filter_by_enable_label), pass the `--label-enable` flag or the `WATCTOWER_LABEL_ENABLE` environment variable on startup and set the _com.centurylinklabs.watchtower.enable_ label with a value of `true` for the containers you want to watch.
@ -8,6 +8,7 @@ The types of notifications to send are set by passing a comma-separated list of
- `slack` to send notifications through a Slack webhook
- `msteams` to send notifications via MSTeams webhook
- `gotify` to send notifications via Gotify
- `shoutrrr` to send notifications via [containrrr/shoutrrr](https://github.com/containrrr/shoutrrr)
> There is currently a [bug](https://github.com/spf13/viper/issues/380) in Viper, which prevents comma-separated slices to be used when using the environment variable. A workaround is available where we instead put quotes around the environment variable value and replace the commas with spaces, as `WATCHTOWER_NOTIFICATIONS="slack msteams"`
To send notifications via shoutrrr, the following command-line options, or their corresponding environment variables, can be set:
- `--notification-url` (env. `WATCHTOWER_NOTIFICATION_URL`): The shoutrrr service URL to be used.
Go to [containrrr.github.io/shoutrrr/services/overview](https://containrrr.github.io/shoutrrr/services/overview) to learn more about the different service URLs you can use.
You can define multiple services by space separating the URLs. (See example below)
Watchtower supports private Docker image registries. In many cases, accessing a private registry requires a valid username and password (i.e., _credentials_). In order to operate in such an environment, watchtower needs to know the credentials to access the registry.
Watchtower supports private Docker image registries. In many cases, accessing a private registry
requires a valid username and password (i.e., _credentials_). In order to operate in such an
environment, watchtower needs to know the credentials to access the registry.
The credentials can be provided to watchtower in a configuration file called `config.json`. There are two ways to generate this configuration file:
The credentials can be provided to watchtower in a configuration file called `config.json`.
There are two ways to generate this configuration file:
* The configuration file can be created manually.
* Call `docker login <REGISTRY_NAME>` and share the resulting configuration file.
### Create the configuration file manually
Create a new configuration file with the following syntax and a base64 encoded username and password `auth` string:
Create a new configuration file with the following syntax and a base64 encoded username and
password `auth` string:
```json
{
"auths": {
@ -17,27 +22,40 @@ Create a new configuration file with the following syntax and a base64 encoded u
}
```
`<REGISTRY_NAME>` needs to be replaced by the name of your private registry (e.g., `my-private-registry.example.org`)
`<REGISTRY_NAME>` needs to be replaced by the name of your private registry
(e.g., `my-private-registry.example.org`)
The required `auth` string can be generated as follows:
```bash
echo -n 'username:password' | base64
```
When the watchtower Docker container is started, the created configuration file (`<PATH>/config.json` in this example) needs to be passed to the container:
> ### ℹ️ Username and Password for GCloud
>
> For gcloud, we'll use `__json_key` as our username and the content
> of `gcloudauth.json` as the password.
When the watchtower Docker container is started, the created configuration file
(`<PATH>/config.json` in this example) needs to be passed to the container:
```bash
docker run [...] -v <PATH>/config.json:/config.json containrrr/watchtower
```
### Share the Docker configuration file
To pull an image from a private registry, `docker login` needs to be called first, to get access to the registry. The provided credentials are stored in a configuration file called `<PATH_TO_HOME_DIR>/.docker/config.json`. This configuration file can be directly used by watchtower. In this case, the creation of an additional configuration file is not necessary.
To pull an image from a private registry, `docker login` needs to be called first, to get access
to the registry. The provided credentials are stored in a configuration file called `<PATH_TO_HOME_DIR>/.docker/config.json`.
This configuration file can be directly used by watchtower. In this case, the creation of an
additional configuration file is not necessary.
When the Docker container is started, pass the configuration file to watchtower:
```bash
docker run [...] -v <PATH_TO_HOME_DIR>/.docker/config.json:/config.json containrrr/watchtower
```
When creating the watchtower container via docker-compose, use the following lines:
Simon Aronsson
5 years ago
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