scale.io
loadbalancing and autoscaling module for websocket based EC2 cluster without ELB.
architecture
- no ELB
- slack based monitoring
- zero downtime deploy
- multi-AZ based
- auto fail over
how to use
scale.js
;set config yml file
set config/default.yaml or config/env.yaml your main app.
Example is this.
execute
node --harmony scale.js
config details
conf for redis / aws / slack
enter your
- redis host & port
- access key id, secret access key and region
- slack info
conf for loadbalancing / autoscaling / monitoring
enter some info (details are below).
conf for loadbalancing
Correspond to A and B in above structure chart.
| key | desc |
|---|---|
| timeoutThresholdForRedHost | Getting no response within this value(ms), host is regard as RedHost(=DyingHost). |
| connNumForRedHost | RedHost is expressed by this value at loadbalancing log. |
| ec2HostTagKey | EC2 tag key |
| ec2HostTagValueForLobby | EC2 tag value for lobby server. |
| ec2HostTagValueForGame | EC2 tag value for game server. |
| intervalForAutoscalingSec | cycle time of autoscale watching process |
| intervalForHostInfoUpdateSec | cycle time of loadbalancing process |
| redisKeyForLobbyLoadbalancing | redis key name for lobby loadbalance. |
| redisKeyForGameLoadbalancing | redis key name for game loadbalance. |
conf for autoscaling
Correspond to C in above structure chart.
| key | desc |
|---|---|
| cfnStackName | stack name of cloudformation. |
| serverTypeNum | server type number. if you use lobby and game, enter 2. |
| scaleOutThreshold | average connection number of instances for scale out. |
| scaleInThreshold | average connection number of instances for scale in. |
| cfnUpdateCmd | update cloudformation command. |
| minimumGreenHostsNum | falling below this value, scale out starts. |
| forceScaleOutStartAt | scale out forced to start after this time. |
| forceScaleOutEndAt | scale out forced to start before this time. |
| scaleInAvailableStartAt | scale in can be started after this time. |
| scaleInAvailableEndAt | scale in can be started after this time. |
| notifyRoomNumMessage | notifying message by slack. |
| scaleInMinimumIntervalSec | scale in can be started countinuously after this interval. |
| scaleOutMinimumIntervalSec | scale out can be started countinuously after this interval. |
| specifiedTimeGreenHostsNum | instance number will be change to this value between specified time. |
| restartCmd | restart autoscale process commond. |
| autoRestartCpuUsageThresholdForLB | if cpu usage exceed this value, process restart. |
| autoRestartMonitorIntervalSec | monitoring span for auto restart. |
conf for monitor
Correspond to D in above structure chart.
| key | desc |
|---|---|
| monitoredHost | monitored target. |
| monitoredProcess | like 'game', 'lobby' |
| monitoringIntervalSec | monitoring span |
| decisionIntervalSec | monitored process does not reply throughout this span, it is regard as died. |