Initial commit

2020-01-27 17:25:39 +01:00 · 2020-01-27 17:25:39 +01:00 · 17acb5582e
commit 17acb5582e
11 changed files with 631 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1 @@
+node_modules
--- a/24
+++ b/24
@ -0,0 +1,24 @@
+FROM debian:buster-slim
+
+ARG DEBIAN_FRONTEND=noninteractive
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        curl \
+        ca-certificates \
+        gnupg2 \
+        libfontconfig \
+    && curl -sL https://deb.nodesource.com/setup_10.x | bash - \
+    && apt-get install -y --no-install-recommends \
+        nodejs \
+    && apt-get purge -y --auto-remove \
+        gnupg2 \
+    && rm -rf /var/lib/apt/lists/* \
+    && npm -g install pm2
+
+WORKDIR /docker-discover
+COPY package.json package-lock.json ./
+RUN npm install --only=prod
+
+COPY index.js config.json rproxy.handlebars ./
+
+CMD ["pm2-runtime", "index.js"]
--- a/17
+++ b/17
@ -0,0 +1,17 @@
+    Copyright (C) 2020 - Verdnatura Levante S.L.
+
+    This package is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+    On Debian systems, the complete text of the GNU General Public
+    License can be found in "/usr/share/common-licenses/GPL-3".
--- a/README.md
+++ b/README.md
@ -0,0 +1,10 @@
+# Docker service autodicovery
+
+Small Javascript application to generate HAProxy configuration from Docker
+services.
+
+## Built with
+
+ * [dockerode](https://github.com/apocas/dockerode/)
+ * [handlebars](https://handlebarsjs.com/)
+ 
--- a/config.json
+++ b/config.json
@ -0,0 +1,18 @@
+{
+    "docker": {
+        "socketPath": "/var/run/docker.sock"
+    },
+    "rproxies": [
+        "rproxy1.local",
+        "rproxy2.local"
+    ],
+    "sshAuth": {
+        "username": "root",
+        "privateKey": "/root/.ssh/id_rsa"
+    },
+    "proxyConf": "/etc/haproxy/haproxy.cfg",
+    "reloadCmd": "service haproxy reload",
+    "delay": 4,
+    "debug": false,
+    "events": ["service", "node"]
+}
--- a/docker-compose.yml
+++ b/docker-compose.yml
@ -0,0 +1,29 @@
+version: '3.7'
+services:
+  discover:
+    image: registry.verdnatura.es/docker-discover
+    build: .
+    environment:
+      - NODE_ENV=production
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+    configs:
+      - source: config
+        target: /docker-discover/config.json
+      - source: template
+        target: /docker-discover/rproxy.handlebars
+      - source: ssh
+        target: /root/.ssh/id_rsa
+    deploy:
+      mode: replicated
+      replicas: 1
+configs:
+  config:
+    external: true
+    name: discover_config
+  template:
+    external: true
+    name: discover_template
+  ssh:
+    external: true
+    name: discover_ssh
--- a/index.js
+++ b/index.js
@ -0,0 +1,77 @@
+let Docker = require('dockerode');
+let handlebars = require('handlebars');
+let ssh = require('node-ssh');
+let fs = require('fs');
+let conf = require('./config.json');
+
+let docker;
+let template;
+
+async function updateProxy() {
+    console.log('Updating proxy configuration.');
+    let data;
+
+    if (process.env.NODE_ENV != 'production') {
+        data = require('./test.json');
+    } else {
+        data = {
+            services: await docker.listServices(),
+            nodes: await docker.listNodes()
+        };
+    }
+
+    let tmpConf = `/tmp/rproxy.${new Date().getTime()}`;
+    let configString = template(data);
+    fs.writeFileSync(tmpConf, configString);
+
+    if (conf.debug || process.env.NODE_ENV != 'production') {
+        let delimiter = '#'.repeat(80);
+        console.log(delimiter);
+        console.log(configString);
+        console.log(delimiter);
+    }
+
+    let files = {
+        local: tmpConf,
+        remote: conf.proxyConf
+    };
+
+    for (let host of conf.rproxies) {
+        console.log(`Updating host: ${host}`);
+        let sshClient = new ssh();
+        await sshClient.connect(Object.assign({host}, conf.sshAuth));
+        await sshClient.putFiles([files]);
+        //await ssh.exec(conf.reloadCmd);
+        await sshClient.dispose();
+    }
+
+    fs.unlinkSync(tmpConf);
+    console.log('Configuration updated.');
+}
+
+(async() => {
+    let timeoutId;
+    docker = new Docker(conf.docker);
+    template = handlebars.compile(fs.readFileSync('rproxy.handlebars', 'utf8'));
+    updateProxy();
+
+    console.log('Listenig for events.')
+    docker.getEvents({}, (err, stream) => {
+        if (err || !stream) {
+            console.error('Failed to monitor docker host', err);
+            return;
+        }
+
+        stream.on('data', event => {
+            event = JSON.parse(event);
+            if (conf.events && conf.events.indexOf(event.Type) == -1) return;
+            console.log(`Event: ${event.Type}: ${event.Action}`);
+
+            if (timeoutId) return;
+            timeoutId = setTimeout(() => {
+                timeoutId = null;
+                updateProxy();
+            }, conf.delay * 1000);
+        })
+    });
+})();
--- a/package-lock.json
+++ b/package-lock.json
@ -0,0 +1,396 @@
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+    "util-deprecate": {
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+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
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+    "wordwrap": {
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+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
+      "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc="
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+    "wrappy": {
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+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
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+  }
+}
--- a/package.json
+++ b/package.json
@ -0,0 +1,15 @@
+{
+  "name": "docker-discover",
+  "description": "Docker service autodiscovery",
+  "license": "GPL-3.0",
+  "repository": {
+    "type": "git",
+    "url": "https://gitea.verdnatura.es/verdnatura/docker-discover"
+},
+
+  "dependencies": {
+    "dockerode": "^3.0.2",
+    "handlebars": "^4.7.2",
+    "node-ssh": "^7.0.0"
+  }
+}
--- a/rproxy.handlebars
+++ b/rproxy.handlebars
@ -0,0 +1,11 @@
+
+# Auto-generated backends
+
+{{#each services}}
+{{#if Endpoint.Ports.[0]}}
+backend {{Spec.Name}}
+	{{#each ../nodes}}
+	server {{Description.Hostname}}({{Status.Addr}}):{{../Endpoint.Ports.[0].PublishedPort}} {{Status.Addr}}:{{../Endpoint.Ports.[0].PublishedPort}} check
+	{{/each}}
+{{/if}}
+{{/each}}
--- a/test.json
+++ b/test.json
@ -0,0 +1,33 @@
+{
+    "services": [
+        {
+            "Spec": {"Name": "service1"},
+            "Endpoint": {
+                "Ports": [
+                    {"PublishedPort": 10001}
+                ]
+            }
+        }, {
+            "Spec": {"Name": "service2"},
+            "Endpoint": {
+                "Ports": []
+            }
+        }, {
+            "Spec": {"Name": "service3"},
+            "Endpoint": {
+                "Ports": [
+                    {"PublishedPort": 10003}
+                ]
+            }
+        }
+    ],
+    "nodes": [
+        {
+            "Description": {"Hostname": "node1"},
+            "Status": {"Addr": "10.0.0.1"}
+        }, {
+            "Description": {"Hostname": "node2"},
+            "Status": {"Addr": "10.0.0.2"}
+        }
+    ]
+}