Watchtower Tutorial: How to install and set up Watchtower on Ubuntu 20.04?

This article table of contents show 1. 1. Preparatory work 2. 2. Watchtower installation tutorial 2.1. 1. Install Docker 2.2. 2. Install Watchtower 3. 3. Additional settings 3.1. 1. Set time zone 3.2. 2. Automatically delete old images 4. 4. Discounts for bricklayers

Watchtower will automatically keep all your running Docker containers up to date. This is useful if you use Docker to run any self-hosted services or applications. Every few minutes, Watchtower pulls the latest image for your application and compares it to the image used to run the container. Suppose there are any changes to the image, in which case Watchtower will automatically restart the container with the new image and use the docker run or docker-compose configuration that was originally used to start it.

This tutorial explains how to install Watchtower on Ubuntu 20.04.

Watchtower official website: https://containrrr.dev/watchtower/

1. Preparatory work

1. Prepare a Debian/Ubuntu system

Systems running on Debian or Ubuntu. Other Linux distributions that use the APT package manager can also be used.

2. Connect to SSH

Secondly, we need to connect to the Banwagonhost VPS via SSH before we can perform a series of operations.

3. Update system

sudo apt update && sudo apt upgrade

2. Watchtower installation tutorial

1. Install Docker

Ideally, you should already have Docker installed on your server since you should already be using it. If not, you can install it by following these steps:

1. Delete all old versions of Docker:

$ sudo apt remove docker docker-engine docker.io containerd runc

2. Install Docker through snap:

$ sudo snap install docker

2. Install Watchtower

If you don't have a Docker container running, create one. For example, you can use the Docker starter image.

$ sudo docker run -d -p 80:80 docker/getting-started

To check if you have any existing running containers, you can run docker ps.

1. Create a Watchtower container

$ sudo docker run --detach \ --name watchtower \ --volume /var/run/docker.sock:/var/run/docker.sock \ containrrr/watchtower

2. Check whether the Watchtower container is running

$ sudo docker ps STATUS Up x seconds/minutes

You have now successfully installed and configured Watchtower to regularly update your Docker container images.

3. Additional settings

Watchtower has some additional configuration that can be changed using command line parameters.

1. Set time zone

You can set the time zone used by Watchtower by mounting the host's /etc/localtime file into the container.

$ sudo docker run --detach \ --name watchtower \ --volume /var/run/docker.sock:/var/run/docker.sock \ --volume /etc/localtime:/etc/localtime:ro \ containrrr/watchtower

2. Automatically delete old images

By default, Watchtower does not delete old images. It may be useful to enable this feature if you need to save disk space.

$ sudo docker run --detach \ --name watchtower \ --volume /var/run/docker.sock:/var/run/docker.sock \ --volume /etc/localtime:/etc/localtime:ro \ containrrr/watchtower \ --cleanup

4. Discounts for bricklayers

Recommended solutions for bricklayers

Real-time inventory of bricklayers: https://stock.bwg.net

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