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< p > Watchtower supports private Docker image registries. In many cases, accessing a private registry
requires a valid username and password (i.e., < em > credentials< / em > ). In order to operate in such an
environment, watchtower needs to know the credentials to access the registry. < / p >
< p > The credentials can be provided to watchtower in a configuration file called < code > config.json< / code > .
There are two ways to generate this configuration file:< / p >
< ul >
< li > The configuration file can be created manually.< / li >
< li > Call < code > docker login < REGISTRY_NAME> < / code > and share the resulting configuration file.< / li >
< / ul >
< h3 id = "create_the_configuration_file_manually" > Create the configuration file manually< a class = "headerlink" href = "#create_the_configuration_file_manually" title = "Permanent link" > ¶ < / a > < / h3 >
< p > Create a new configuration file with the following syntax and a base64 encoded username and
password < code > auth< / code > string:< / p >
< div class = "codehilite" > < pre > < span > < / span > < code > < span class = "p" > {< / span >
< span class = "nt" > " auths" < / span > < span class = "p" > :< / span > < span class = "p" > {< / span >
< span class = "nt" > " < REGISTRY_NAME> " < / span > < span class = "p" > :< / span > < span class = "p" > {< / span >
< span class = "nt" > " auth" < / span > < span class = "p" > :< / span > < span class = "s2" > " XXXXXXX" < / span >
< span class = "p" > }< / span >
< span class = "p" > }< / span >
< span class = "p" > }< / span >
< / code > < / pre > < / div >
< p > < code > < REGISTRY_NAME> < / code > needs to be replaced by the name of your private registry
(e.g., < code > my-private-registry.example.org< / code > )< / p >
< p > The required < code > auth< / code > string can be generated as follows:< / p >
< div class = "codehilite" > < pre > < span > < / span > < code > < span class = "nb" > echo< / span > -n < span class = "s1" > ' username:password' < / span > < span class = "p" > |< / span > base64
< / code > < / pre > < / div >
< blockquote >
< h3 id = "i_username_and_password_for_gcloud" > ℹ ️ < a class = "headerlink" href = "#i_username_and_password_for_gcloud" title = "Permanent link" > ¶ < / a > < / h3 >
< p > For gcloud, we'll use < code > _json_key< / code > as our username and the content
of < code > gcloudauth.json< / code > as the password.
< code > bash
echo -n "_json_key:$(cat gcloudauth.json)" | base64 -w0< / code >
When the watchtower Docker container is started, the created configuration file
(< code > < PATH> /config.json< / code > in this example) needs to be passed to the container:< / p >
< / blockquote >
< div class = "codehilite" > < pre > < span > < / span > < code > docker run < span class = "o" > [< / span > ...< span class = "o" > ]< / span > -v < PATH> /config.json:/config.json containrrr/watchtower
< / code > < / pre > < / div >
< h3 id = "share_the_docker_configuration_file" > Share the Docker configuration file< a class = "headerlink" href = "#share_the_docker_configuration_file" title = "Permanent link" > ¶ < / a > < / h3 >
< p > To pull an image from a private registry, < code > docker login< / code > needs to be called first, to get access
to the registry. The provided credentials are stored in a configuration file called < code > < PATH_TO_HOME_DIR> /.docker/config.json< / code > .
This configuration file can be directly used by watchtower. In this case, the creation of an
additional configuration file is not necessary.< / p >
< p > When the Docker container is started, pass the configuration file to watchtower:< / p >
< div class = "codehilite" > < pre > < span > < / span > < code > docker run < span class = "o" > [< / span > ...< span class = "o" > ]< / span > -v < PATH_TO_HOME_DIR> /.docker/config.json:/config.json containrrr/watchtower
< / code > < / pre > < / div >
< p > When creating the watchtower container via docker-compose, use the following lines:< / p >
< div class = "codehilite" > < pre > < span > < / span > < code > < span class = "nt" > version< / span > < span class = "p" > :< / span > < span class = "s" > " 3.4" < / span >
< span class = "nt" > services< / span > < span class = "p" > :< / span >
< span class = "nt" > watchtower< / span > < span class = "p" > :< / span >
< span class = "nt" > image< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > index.docker.io/containrrr/watchtower:latest< / span >
< span class = "nt" > volumes< / span > < span class = "p" > :< / span >
< span class = "p p-Indicator" > -< / span > < span class = "l l-Scalar l-Scalar-Plain" > /var/run/docker.sock:/var/run/docker.sock< / span >
< span class = "p p-Indicator" > -< / span > < span class = "l l-Scalar l-Scalar-Plain" > < PATH_TO_HOME_DIR> /.docker/config.json:/config.json< / span >
< span class = "l l-Scalar l-Scalar-Plain" > ...< / span >
< / code > < / pre > < / div >
< h4 id = "docker_config_path" > Docker Config path< a class = "headerlink" href = "#docker_config_path" title = "Permanent link" > ¶ < / a > < / h4 >
< p > By default, watchtower will look for the < code > config.json< / code > file in < code > /< / code > , but this can be changed by setting the < code > DOCKER_CONFIG< / code > environment variable to the directory path where your config is located. This is useful for setups where the config.json file is changed while the watchtower instance is running, as the changes will not be picked up for a mounted file if the inode changes.
Example usage:< / p >
< div class = "codehilite" > < pre > < span > < / span > < code > < span class = "nt" > version< / span > < span class = "p" > :< / span > < span class = "s" > " 3.4" < / span >
< span class = "nt" > services< / span > < span class = "p" > :< / span >
< span class = "nt" > watchtower< / span > < span class = "p" > :< / span >
< span class = "nt" > image< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > containrrr/watchtower< / span >
< span class = "nt" > environment< / span > < span class = "p" > :< / span >
< span class = "nt" > DOCKER_CONFIG< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > /config< / span >
< span class = "nt" > volumes< / span > < span class = "p" > :< / span >
< span class = "p p-Indicator" > -< / span > < span class = "l l-Scalar l-Scalar-Plain" > /etc/watchtower/config/:/config/< / span >
< span class = "p p-Indicator" > -< / span > < span class = "l l-Scalar l-Scalar-Plain" > /var/run/docker.sock:/var/run/docker.sock< / span >
< / code > < / pre > < / div >
< h2 id = "credential_helpers" > Credential helpers< a class = "headerlink" href = "#credential_helpers" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Some private Docker registries (the most prominent probably being AWS ECR) use non-standard ways of authentication.
To be able to use this together with watchtower, we need to use a credential helper.< / p >
< p > To keep the image size small we've decided to not include any helpers in the watchtower image, instead we'll put the
helper in a separate container and mount it using volumes.< / p >
< h3 id = "example" > Example< a class = "headerlink" href = "#example" title = "Permanent link" > ¶ < / a > < / h3 >
< p > Example implementation for use with < a href = "https://github.com/awslabs/amazon-ecr-credential-helper" > amazon-ecr-credential-helper< / a > :< / p >
< p > Use the dockerfile below to build the < a href = "https://github.com/awslabs/amazon-ecr-credential-helper" > amazon-ecr-credential-helper< / a > ,
in a volume that may be mounted onto your watchtower container.< / p >
< ol >
< li > Create the Dockerfile (contents below): < / li >
< / ol >
< div class = "codehilite" > < pre > < span > < / span > < code > < span class = "k" > FROM< / span > < span class = "s" > golang:latest< / span >
< span class = "k" > ENV< / span > CGO_ENABLED < span class = "m" > 0< / span >
< span class = "k" > ENV< / span > REPO github.com/awslabs/amazon-ecr-credential-helper/ecr-login/cli/docker-credential-ecr-login
< span class = "k" > RUN< / span > go get -u < span class = "nv" > $REPO< / span >
< span class = "k" > RUN< / span > rm /go/bin/docker-credential-ecr-login
< span class = "k" > RUN< / span > go build < span class = "se" > \< / span >
-o /go/bin/docker-credential-ecr-login < span class = "se" > \< / span >
/go/src/< span class = "nv" > $REPO< / span >
< span class = "k" > WORKDIR< / span > < span class = "s" > /go/bin/< / span >
< / code > < / pre > < / div >
< ol >
< li > Use the following commands to build the aws-ecr-dock-cred-helper and store it's output in a volume:< / li >
< / ol >
< p > ```shell script< / p >
< h1 id = "create_a_volume_to_store_the_command_once_built" > Create a volume to store the command (once built)< a class = "headerlink" href = "#create_a_volume_to_store_the_command_once_built" title = "Permanent link" > ¶ < / a > < / h1 >
< p > docker volume create helper < / p >
< h1 id = "build_the_container" > Build the container< a class = "headerlink" href = "#build_the_container" title = "Permanent link" > ¶ < / a > < / h1 >
< p > docker build -t aws-ecr-dock-cred-helper .< / p >
< h1 id = "build_the_command_and_store_it_in_the_new_volume_in_the_gobin_directory" > Build the command and store it in the new volume in the /go/bin directory.< a class = "headerlink" href = "#build_the_command_and_store_it_in_the_new_volume_in_the_gobin_directory" title = "Permanent link" > ¶ < / a > < / h1 >
< p > docker run -d --rm --name aws-cred-helper --volume helper:/go/bin aws-ecr-dock-cred-helper< / p >
< div class = "codehilite" > < pre > < span > < / span > < code > < span class = "mi" > 3< / span > < span class = "p" > .< / span > < span class = "k" > Create< / span > < span class = "n" > a< / span > < span class = "n" > configuration< / span > < span class = "n" > file< / span > < span class = "k" > for< / span > < span class = "n" > docker< / span > < span class = "p" > ,< / span > < span class = "k" > and< / span > < span class = "n" > store< / span > < span class = "n" > it< / span > < span class = "k" > in< / span > < span class = "err" > $< / span > < span class = "n" > HOME< / span > < span class = "o" > /< / span > < span class = "p" > .< / span > < span class = "n" > docker< / span > < span class = "o" > /< / span > < span class = "n" > config< / span > < span class = "p" > .< / span > < span class = "n" > json< / span > < span class = "p" > (< / span > < span class = "k" > replace< / span > < span class = "n" > the< / span > < span class = "o" > < < / span > < span class = "n" > AWS_ACCOUNT_ID< / span > < span class = "o" > > < / span >
< span class = "n" > placeholders< / span > < span class = "k" > with< / span > < span class = "n" > your< / span > < span class = "n" > AWS< / span > < span class = "n" > Account< / span > < span class = "n" > ID< / span > < span class = "p" > ):< / span >
< span class = "o" > ```< / span > < span class = "n" > json< / span >
< span class = "err" > {< / span >
< span class = "ss" > " credsStore" < / span > < span class = "p" > :< / span > < span class = "ss" > " ecr-login" < / span > < span class = "p" > ,< / span >
< span class = "ss" > " HttpHeaders" < / span > < span class = "p" > :< / span > < span class = "err" > {< / span >
< span class = "ss" > " User-Agent" < / span > < span class = "p" > :< / span > < span class = "ss" > " Docker-Client/19.03.1 (XXXXXX)" < / span >
< span class = "err" > }< / span > < span class = "p" > ,< / span >
< span class = "ss" > " auths" < / span > < span class = "p" > :< / span > < span class = "err" > {< / span >
< span class = "ss" > " < AWS_ACCOUNT_ID> .dkr.ecr.us-west-1.amazonaws.com" < / span > < span class = "p" > :< / span > < span class = "err" > {}< / span >
< span class = "err" > }< / span > < span class = "p" > ,< / span >
< span class = "ss" > " credHelpers" < / span > < span class = "p" > :< / span > < span class = "err" > {< / span >
< span class = "ss" > " < AWS_ACCOUNT_ID> .dkr.ecr.us-west-1.amazonaws.com" < / span > < span class = "p" > :< / span > < span class = "ss" > " ecr-login" < / span >
< span class = "err" > }< / span >
< span class = "err" > }< / span >
< / code > < / pre > < / div >
< ol >
< li > Create a docker-compose file (as an example) to help launch the container:< / li >
< / ol >
< p > and the docker-compose definition:< / p >
< div class = "codehilite" > < pre > < span > < / span > < code > < span class = "nt" > version< / span > < span class = "p" > :< / span > < span class = "s" > " 3.4" < / span >
< span class = "nt" > services< / span > < span class = "p" > :< / span >
< span class = "c1" > # Check for new images and restart things if a new image exists< / span >
< span class = "c1" > # for any of our containers.< / span >
< span class = "nt" > watchtower< / span > < span class = "p" > :< / span >
< span class = "nt" > image< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > containrrr/watchtower:latest< / span >
< span class = "nt" > volumes< / span > < span class = "p" > :< / span >
< span class = "p p-Indicator" > -< / span > < span class = "l l-Scalar l-Scalar-Plain" > /var/run/docker.sock:/var/run/docker.sock< / span >
< span class = "p p-Indicator" > -< / span > < span class = "l l-Scalar l-Scalar-Plain" > .docker/config.json:/config.json< / span >
< span class = "p p-Indicator" > -< / span > < span class = "l l-Scalar l-Scalar-Plain" > helper:/go/bin< / span >
< span class = "nt" > environment< / span > < span class = "p" > :< / span >
< span class = "p p-Indicator" > -< / span > < span class = "l l-Scalar l-Scalar-Plain" > HOME=/< / span >
< span class = "p p-Indicator" > -< / span > < span class = "l l-Scalar l-Scalar-Plain" > PATH=$PATH:/go/bin< / span >
< span class = "p p-Indicator" > -< / span > < span class = "l l-Scalar l-Scalar-Plain" > AWS_REGION=us-west-1< / span >
< span class = "nt" > volumes< / span > < span class = "p" > :< / span >
< span class = "nt" > helper< / span > < span class = "p" > :< / span >
< span class = "nt" > external< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > true< / span >
< / code > < / pre > < / div >
< p > A few additional notes:< / p >
< ol >
< li > With docker-compose the volume (helper, in this case) MUST be set to < code > external: true< / code > , otherwise docker-compose
will preface it with the directory name.< / li >
< li > Note that "credsStore" : "ecr-login" is needed - and in theory if you have that you can remove the
credHelpers section < / li >
< li > I have this running on an EC2 instance that has credentials assigned to it - so no keys are needed; however,
you may need to include the < code > AWS_ACCESS_KEY_ID< / code > and < code > AWS_SECRET_ACCESS_KEY< / code > environment variables as well.< / li >
< li > An alternative to adding the various variables is to create a ~/.aws/config and ~/.aws/credentials files and
place the settings there, then mount the ~/.aws directory to / in the container.< / li >
< / ol >
< / article >
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