Method 1: Setup remote Docker access using SSH
- Prerequisites. You must have SSH public key authentication enabled between the participating machines. ... Use the...
- Configuration changes on your local system. Here are the things you need to tweak on your local, personal system from...
- Test the configuration. It doesn't matter which method you opted for (environment...
How to access Docker containers webapps from remote machines?
I figured out what I missed, so here's a simple flow for accessing docker containers webapps from remote machines: Step #1 : Bind physical host ports (e.g. 22, 443, 80, ...) to container's virtual ports. possible syntax: Step #2 : Redirect host's physical port to container's allocated virtual port. possible (linux) syntax:
How do I connect Docker to a host?
You could link the host's /var/run/docker.sock within the container where you need it. This way, you don't expose the Docker Remote API via an open port. Be aware that it does provide root-like access to docker.
How can I monitor Docker containers remotely?
All can be done remotely. Many monitoring tools, like Portainer, need access to the Docker API endpoint to monitor details like networks, running containers, etc. Normally to add a server to the endpoint list, you'd have to deploy a Portainer agent on the server first and bind some port from the container to the host.
How do I run a command in a docker container?
To execute a command inside the container run the following command: docker container exec -it my_mysql ls /var. The -i option stands for interactive, and -t tells Docker to allocate a pseudo TTY device. The ls command will list all files and directories inside container’s /var directory:
What is a docker command?
The docker command is nothing but the client application. The client and the daemon communicate via the docker API over a traditional Unix socket that you can find at /run/docker.sock or /var/run/docker.sock. The client asks the daemon to do something, or retrieve information, and the daemon does just that.
How to confirm a docker command?
To confirm the above statement, run any docker command at the end of this section (while testing) with the -l debug flag. This will print the exact command being executed on your local machine.
Why do I need to use Portainer?
Many monitoring tools, like Portainer, need access to the Docker API endpoint to monitor details like networks, running containers, etc. Normally to add a server to the endpoint list, you'd have to deploy a Portainer agent on the server first and bind some port from the container to the host. Instead, you could just let it access the docker daemon directly, this would save a lot of your resources.
What does SSH do to a remote host?
When using the SSH protocol for remote docker access what happens is that the docker client actually runs an ssh command on the local host, with a hidden docker command (docker system dial-stdio) on the remote host, that establishes a connection to the remote's dockerd endpoint which is almost always /var/run/docker.sock, and forward the connection to the commands stdio.
What flag do you use to run a docker?
Alternatively, you can also use the -H flag like I've done here with the docker command
How to copy a public key to a remote server?
Use ssh-copy-id user@ip command to copy over the public key to the remote server.
Is SSH secure on Docker?
Friends at docker have already considered this. Using SSH for the in-between protocol, it is as secure as your SSH sessions are. More on this in later section of this tutorial.
What Is Docker Remote Access?
Method 1: Setup Remote Docker Access Using Ssh
- One of the best thing about using SSHhere is that it requires a lot less work than the other method. If you already have SSH keys set up, it's literally a one-step process. Before moving forward I want you to have this mental picture in place, for understanding how this SSH method works, and why it's configured the way it's configured. To confirm the above statement, run any …
Method 2: Using A Public TCP Port with TLS Authentication
- This method is more complicate than the previous one, but has it's advantages like not having to use the dockergroup at all. The idea here is simple, you're going to create your own certificates and private keys, and then use a TCP port to access the dockerdaemon through not plain HTTP, but a secure HTTPS channel. It is analogous to a website. In case of a website, you configure it …
Preparing The Certificates and Keys
- In the following steps, you'll be generating certificates and private keys for your server and client. Certificate Authority To make the transactions simple, I'll be using my client machine to generate all the files. You can use a separate machine for that if necessary. A CA certificate is nothing but a self-signed certificate. But first, you need to generate your CA's private key. Use the following co…
Setting Up The Environment
- Once the certificates and private keys are ready, you need to tell your docker engine and client about them, along with exposing the engine API to a public TCP port and letting the client use the docker engine that's not sitting at the local machine. The following steps go through exactly that. The docker host First, copy over three files from the administrator's machine, the CA certificate (…
Test The Setup
- Now that everything is done, you can test it by running docker info, or run any random container, whichever comes to your mind. You can also use curl to test it (Remember? These are simple HTTP requests). Use the following as an alternative to docker info This will output a JSON object that you can parse using something like jq. You can also try and run an Nginx server with docker…
Which Method to use? TCP Or Ssh?
- Both methods has their own merits. The SSH method is easier if you don't want to go through many hoops. But some applications like Portainer won't work with the SSH method for remote daemon access. Using the TCP method also eliminates the issues of "using or not using the docker group" by default. Choose whichever method satisfies your purpose. I hope this tutorial …