meteor-load-balancing

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meteor-load-balancing

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Example application demonstrating load balancing a meteor app using HAProxy

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meteor-load-balancing
=====================

Example application demonstrating load balancing a meteor app using HAProxy

## Setup

1. Install HAProxy
```bash
# on OSX with homebrew
brew install haproxy
```

2. Download this example
```bash
git clone https://github.com/alanning/meteor-load-balancing
```

## Run

1. Open 5 terminal windows

2. From `meteor-load-balancing` directory:

```bash
# term1
haproxy -f haproxy.cfg

# term2
./run

# term3
./run 2

# term4
./run 3

# term5
./run 4
```

Open http://localhost:3000/ in some browsers.

## Future work

* Include health checks as found [here](http://haproxy.1wt.eu/download/1.2/doc/architecture.txt)
* Use [Smart Collections](http://meteorhacks.com/lets-scale-meteor.html) to avoid update delays
* Support auto-scaling, ex: [haproxy-autoscale](https://github.com/markcaudill/haproxy-autoscale)

Pull requests welcome.

## Further Reading

* [AWS Route53 health checks](http://docs.aws.amazon.com/Route53/latest/DeveloperGuide/dns-failover.html)
* [AWS HAProxy Layer via OpsCode](http://docs.aws.amazon.com/opsworks/latest/userguide/workinglayers-load.html)
* [HAProxy architecture examples](http://haproxy.1wt.eu/download/1.2/doc/architecture.txt)
* [Load Balancing your Meteor App](http://meteorhacks.com/load-balancing-your-meteor-app.html)
* [SockJS HAProxy config](https://github.com/sockjs/sockjs-node/blob/master/examples/haproxy.cfg)

## Configuring logging (syslog)

HAProxy logs to syslog so that there is no downtime required by utils such as `logrotate`.  On OSX, syslog is not set up to listen to network log requests so a bit of configuration is needed before you will be able to see HAProxy log messages.

To configure syslog on OSX:

1. Backup syslogd start up file
```bash
sudo cp /System/Library/LaunchDaemons/com.apple.syslogd.plist /System/Library/LaunchDaemons/com.apple.syslogd.plist.backup
```

2. Convert binary file to xml to be human readable / editable
```bash
sudo plutil -convert xml1 /System/Library/LaunchDaemons/com.apple.syslogd.plist
```

3. Edit `/System/Library/LaunchDaemons/com.apple.syslogd.plist` and add the following snippet under the sockets node
```xml
 <key>NetworkListener</key>
 <dict>
   <key>SockServiceName</key>
   <string>syslog</string>
   <key>SockType</key>
   <string>dgram</string>
 </dict>
```
Should read like this now
```xml
 <key>Sockets</key>
 <dict>
    <key>AppleSystemLogger</key>
    <dict>
        <key>SockPathMode</key>
        <integer>438</integer>
        <key>SockPathName</key>
        <string>/var/run/asl_input</string>
    </dict>
    <key>BSDSystemLogger</key>
    <dict>
        <key>SockPathMode</key>
        <integer>438</integer>
        <key>SockPathName</key>
        <string>/var/run/syslog</string>
        <key>SockType</key>
        <string>dgram</string>
    </dict>
    <key>NetworkListener</key>
    <dict>
        <key>SockServiceName</key>
        <string>syslog</string>
        <key>SockType</key>
        <string>dgram</string>
    </dict>
 </dict>
```

4. Save the file

5. Convert back to binary file
```bash
sudo plutil -convert binary1 /System/Library/LaunchDaemons/com.apple.syslogd.plist
```

6. Restart syslogd
```bash
sudo launchctl unload /System/Library/LaunchDaemons/com.apple.syslogd.plist
sudo launchctl load /System/Library/LaunchDaemons/com.apple.syslogd.plist
```

7. Add the following entry to `/etc/syslog.conf`
```bash
local2.*  /var/log/haproxy.log
```

8. Include logging options in `haproxy.cfg` (already included in example haproxy.cfg)
<pre>
    global
       log 127.0.0.1  local2 debug
    defaults
       mode http
       option httplog
       log global
</pre>

9. Restart HAproxy

HAProxy output will now log to `/var/log/haproxy.log`

An easy way to view log output on OSX is to run `Console.app`

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