verdnatura/docker-discover
verdnatura
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docker-discover
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This commit is contained in:
Juan Ferrer 2020-01-27 17:25:39 +01:00
commit 17acb5582e
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.gitignore vendored Normal file
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node_modules

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Dockerfile Normal file
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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"]

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LICENSE Normal file
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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".

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README.md Normal file
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# 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/)

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config.json Normal file
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{
"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"]
}

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docker-compose.yml Normal file
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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

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index.js Normal file
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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);
})
});
})();

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15
package.json Normal file
View File

@ -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"
}
}

11
rproxy.handlebars Normal file
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@ -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}}

33
test.json Normal file
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@ -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"}
}
]
}