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+---
+title: Docker Swarm on NixOS
+date: 2024-08-08T01:01:00.000Z
+author: David Vasandani
+summary: Docker Swarm on NixOS
+tags:
+  - post
+---
+### Install Docker
+
+1. Update `flake.nix` to `nixos-24.05` where Docker Engine 2.7 is available
+```
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
+  };
+```
+
+2. Update `configuration.nix` to open the Docker ports
+```
+  networking.firewall.allowedTCPPorts = [
+    22
+    53
+    2377
+    7946
+    3000
+  ];
+  networking.firewall.allowedUDPPorts = [
+    7946
+    4789
+  ];
+```
+
+3. Update `configuration.nix` to install and start Docker Engine 2.7
+```
+  virtualisation.docker = {
+    enable = true;
+    rootless = {
+      enable = true;
+      setSocketVariable = true;
+    };
+    package = pkgs.docker_27;
+    daemon.settings = {
+      live-restore = false;
+    };
+  };
+```
+
+4. Rebuild
+```
+nixos-rebuild switch
+```
+
+5. Initialize the Swarm
+```
+docker swarm init --advertise-addr ###.###.###.###
+```
+
+---
+
+### Expose the Docker API via TCP
+
+1. Add `listenOptions`. Only tcp should be set because `/run/docker.sock` is already exposed via `rootless.setSocketVariable`
+
+```
+  virtualisation.docker = {
+    enable = true;
+    listenOptions = [ "0.0.0.0:2375" ];
+    rootless = {
+      enable = true;
+      setSocketVariable = true;
+    };
+    package = pkgs.docker_27;
+    daemon.settings = {
+      live-restore = false;
+    };
+  };
+```
+
+2. Add new listener port to `networking.firewall.allowedTCPPorts`
+```
+  networking.firewall.allowedTCPPorts = [
+    22
+    53
+    2377
+    7946
+    3000
+  ];
+```
+
+3. Rebuild
+```
+nixos-rebuild switch
+```
+
+4. Restart Docker Socket
+```
+systemctl restart docker.socket
+```
+
+5. Add the remote Docker context
+```
+docker context create remote --docker "host=tcp://###.###.###.###:2375"
+```
+
+6. Use the new context for a one-off command or switch to it 
+```
+docker --context remote ps
+docker context use remote
+```
+
+---
+
+### Join a worker to the Swarm and scale a service
+
+1. Join the Swarm from the worker device 
+```
+docker swarm join --token XXX ###.###.###.###:2377
+```
+
+2. Create a Swarm Service
+```
+docker service create --replicas 1 --name helloworld alpine ping docker.com
+```
+
+3. Inspect
+```
+docker service inspect --pretty helloworld
+```
+
+4. Scale the service. 
+```
+docker service scale helloworld=5
+```
+
+5. List the tasks
+```
+docker service ps helloworld
+```