Docker MCP Server

Instructions

Implementation Reference

• src/index.ts:738-818 (handler)

  The main handler function for the 'docker_remote_connection' tool. It processes actions like 'connect', 'disconnect', 'status', and 'test' by interacting with the RemoteDockerManager class.
  async ({ action, host, user, keyPath }) => { try { switch (action) { case "connect": if (!host) { throw new Error("Host is required for connection"); } // Configure SSH connection if needed if (host.startsWith("ssh://")) { const sshHost = host.replace("ssh://", ""); if (user && !sshHost.includes("@")) { host = `ssh://${user}@${sshHost}`; } } RemoteDockerManager.setDockerHost(host); const isConnected = await RemoteDockerManager.testConnection(); if (!isConnected) { throw new Error("Failed to connect to remote Docker host"); } return { content: [ { type: "text", text: `✅ Successfully connected to Docker host: ${host}\n\nUse 'docker_remote_connection' with action 'status' to check connection status.` } ] }; case "disconnect": RemoteDockerManager.setDockerHost(""); delete process.env.DOCKER_HOST; return { content: [ { type: "text", text: "✅ Disconnected from remote Docker host. Using local Docker daemon." } ] }; case "status": const connectionInfo = await RemoteDockerManager.getConnectionInfo(); return { content: [ { type: "text", text: `## Docker Connection Status\n\n${connectionInfo}` } ] }; case "test": const testResult = await RemoteDockerManager.testConnection(); const currentHost = RemoteDockerManager.getDockerHost(); return { content: [ { type: "text", text: `## Connection Test\n\nHost: ${currentHost || 'local'}\nStatus: ${testResult ? '✅ Connected' : '❌ Failed'}` } ] }; } } catch (error) { return { content: [ { type: "text", text: `Error with remote connection: ${error instanceof Error ? error.message : String(error)}` } ], isError: true }; } }
• src/index.ts:728-737 (schema)

  The schema definition for the 'docker_remote_connection' tool, including title, description, and Zod inputSchema for validation.
  { title: "Remote Docker Connection", description: "Connect to remote Docker hosts via SSH or configure Docker host", inputSchema: { action: z.enum(["connect", "disconnect", "status", "test"]).describe("Connection action"), host: z.string().optional().describe("Docker host URL (e.g., ssh://user@host, tcp://host:2376)"), user: z.string().optional().describe("SSH username"), keyPath: z.string().optional().describe("Path to SSH private key") } },
• src/index.ts:726-819 (registration)

  The server.registerTool call that registers the 'docker_remote_connection' tool with its schema and handler function.
  server.registerTool( "docker_remote_connection", { title: "Remote Docker Connection", description: "Connect to remote Docker hosts via SSH or configure Docker host", inputSchema: { action: z.enum(["connect", "disconnect", "status", "test"]).describe("Connection action"), host: z.string().optional().describe("Docker host URL (e.g., ssh://user@host, tcp://host:2376)"), user: z.string().optional().describe("SSH username"), keyPath: z.string().optional().describe("Path to SSH private key") } }, async ({ action, host, user, keyPath }) => { try { switch (action) { case "connect": if (!host) { throw new Error("Host is required for connection"); } // Configure SSH connection if needed if (host.startsWith("ssh://")) { const sshHost = host.replace("ssh://", ""); if (user && !sshHost.includes("@")) { host = `ssh://${user}@${sshHost}`; } } RemoteDockerManager.setDockerHost(host); const isConnected = await RemoteDockerManager.testConnection(); if (!isConnected) { throw new Error("Failed to connect to remote Docker host"); } return { content: [ { type: "text", text: `✅ Successfully connected to Docker host: ${host}\n\nUse 'docker_remote_connection' with action 'status' to check connection status.` } ] }; case "disconnect": RemoteDockerManager.setDockerHost(""); delete process.env.DOCKER_HOST; return { content: [ { type: "text", text: "✅ Disconnected from remote Docker host. Using local Docker daemon." } ] }; case "status": const connectionInfo = await RemoteDockerManager.getConnectionInfo(); return { content: [ { type: "text", text: `## Docker Connection Status\n\n${connectionInfo}` } ] }; case "test": const testResult = await RemoteDockerManager.testConnection(); const currentHost = RemoteDockerManager.getDockerHost(); return { content: [ { type: "text", text: `## Connection Test\n\nHost: ${currentHost || 'local'}\nStatus: ${testResult ? '✅ Connected' : '❌ Failed'}` } ] }; } } catch (error) { return { content: [ { type: "text", text: `Error with remote connection: ${error instanceof Error ? error.message : String(error)}` } ], isError: true }; } } );
• src/index.ts:321-348 (helper)

  The RemoteDockerManager class providing static methods for managing Docker host connections, testing connectivity, and getting connection info, used by the tool handler.
  class RemoteDockerManager { private static currentHost: string | null = null; static setDockerHost(host: string): void { this.currentHost = host; process.env.DOCKER_HOST = host; } static getDockerHost(): string | null { return this.currentHost || process.env.DOCKER_HOST || null; } static async testConnection(): Promise<boolean> { try { await executeDockerCommand("docker version"); return true; } catch { return false; } } static async getConnectionInfo(): Promise<string> { const host = this.getDockerHost(); const isConnected = await this.testConnection(); return `Docker Host: ${host || 'local'}\nConnection: ${isConnected ? '✅ Connected' : '❌ Failed'}`; } }