Helm charts for anycable

This repo contains a Helm chart to deploy anycable-go websocket server.

TL;DR

To install anycable-go to your kubernetes cluster simply run:

helm repo add anycable https://helm.anycable.io/

# With Helm 3
helm upgrade -i anycable-go anycable/anycable-go

# With Helm 2
helm upgrade -i --name anycable-go anycable/anycable-go

Introduction

AnyCable allows you to use any WebSocket server (written in any language) as a replacement for your Ruby server (such as Faye, ActionCable, etc).

AnyCable uses the same protocol as ActionCable, so you can use its JavaScript client without any monkey-patching.

anycable-go is an implementations of AnyCable WebSocket server written in Go. This repository allows you to install anycable-go into your Kubernetes cluster.

Prerequisites

• Kubernetes 1.4+ with Beta APIs enabled

Installing chart

helm repo add anycable https://helm.anycable.io/

# With Helm 3
helm upgrade -i anycable-go anycable/anycable-go

# With Helm 2
helm upgrade -i --name anycable-go anycable/anycable-go

The command deploys anycable-go on the Kubernetes cluster in the default configuration. The configuration section lists various ways to override default configuration during deployment.

Tip: To list all releases use helm list

Uninstalling the Chart

helm delete anycable-go

The command removes all the Kubernetes components associated with the chart and deletes the release.

Configuration

Specify each parameter using the --set key=value[,key=value] argument to helm install or provide your own file via -f values.yaml. For example,

helm upgrade -i anycable-go \
  --namespace anycable-go \
  --set image.tag=1.0.1 \
  anycable/anycable-go

The above command installs a specified version of anycable.

Supported Chart values

anycable-go

These are the values used to configure anycable-go itself:

Value	Description	Default
image.repository	Choose between anycable/anycable-go and ghcr.io/anycable/anycable-go-pro	anycable/anycable-go
image.tag	Version of docker image to use	1.4.7
image.pullSecrets.enabled	Enable creating secret for pulling image from AnyCable Pro private registry	false
image.pullSecrets.registry	URL of a private registry you want to authorize to	ghcr.io
image.pullSecrets.username	Github username	``
image.pullSecrets.password	Github token	``
env.anycableHost	Listen IP address or host	0.0.0.0
env.anycablePort	Listen port number	8080
env.anycablePath	WebSocket endpoint path (you can specify multiple paths using a comma as separator)	/cable
env.anycableBroadcastAdapter	Broadcasting adapter to use: redis, http, redisx or nats (multiple are allowed via a comma-separated list)	redis
env.anycableHttpBroadcastPath	HTTP pub/sub endpoint path	/_broadcast
env.anycableHttpBroadcastPort	Port to receive broadcasting requests	8090
env.anycableHttpBroadcastSecret	Authorization secret to protect the broadcasting endpoint
env.anycableRedisUrl	Redis DB url	redis://localhost:6379/5
env.anycableRedisChannel	Redis channel for broadcasts	__anycable__
env.anycableRedisSentinels	Comma-separated list of sentinel hosts, format: :password@hostname:port,..
env.anycableRedisSentinelDiscoveryInterval	Interval to rediscover sentinels in seconds	30
env.anycableRedisKeepaliveInterval	Interval to periodically ping Redis to make sure it's alive	30
env.anycableRedisTlsVerify	Whether to validate Redis server TLS certificate if rediss:// protocol is used	false
env.anycableRedisTlsClientCertPath	Path to file with client TLS certificate in PEM format if Redis server requires client authentication
env.anycableRedisTlsClientKeyPath	Path to file with private key for client TLS certificate if Redis server requires client authentication
env.anycableRpcConcurrency	Max number of concurrent RPC request; should be slightly less than the RPC server concurrency	28
env.anycableRpcHost	RPC service address	localhost:50051
env.anycableRpcEnableTls	Enable client-side TLS with the RPC server	false
env.anycableRpcTlsVerify	Whether to verify the RPC server certificate	true
env.anycableRpcTlsRootCa	CA root certificate file path or contents in PEM format	If not set, system CAs will be used
env.anycableRpcMaxCallRecvSize	Override default MaxCallRecvMsgSize for RPC client (bytes)
env.anycableRpcMaxCallSendSize	Override default MaxCallSendMsgSize for RPC client (bytes)
env.anycableRpcImpl	RPC implementation (grpc, http)
env.anycableHttpRpcSecret	Authentication secret for RPC over HTTP
env.anycableHttpRpcTimeout	HTTP RPC timeout (in ms)	3000
env.anycableHeaders	List of headers to proxy to RPC	cookie
env.anycableProxyCookies	Cookie keys to send to RPC, default is all
env.anycablePresets	Configuration presets, comma-separated (none, fly, heroku, broker)	Inferred automatically if possible
env.anycableBroker	Broker engine to use (none, memory, nats, redis)	``
env.anycableHistoryLimit	Max number of messages to keep in the stream's history	100
env.anycableHistoryTtl	TTL for messages in stream's history (seconds)	300
env.anycableSessionsTtl	TTL for expired/disconnected sessions (seconds)	300
env.anycablePubsub	Pub/Sub adapter to use (none, redis, nats)	``
env.anycableNatsServers	Comma-separated list of NATS cluster servers	nats://localhost:4222
env.anycableNatsChannel	NATS channel for broadcasts	__anycable__
env.anycableNatsDontRandomizeServers	Disable NATS servers randomization during (re-)connect	false
env.anycableEmbedNats	Enable embedded NATS server and use it for pub/sub
env.anycableEnatsAddr	NATS server bind address	nats://localhost:4222
env.anycableEnatsCluster	NATS cluster service bind address
env.anycableEnatsClusterName	NATS cluster name	anycable-cluster
env.anycableEnatsClusterRoutes	Comma-separated list of known cluster addresses
env.anycableEnatsGateway	NATS gateway bind address
env.anycableEnatsGateways	Semicolon-separated list of known gateway configurations
env.anycableEnatsGatewayAdvertise	NATS gateway advertise address
env.anycableEnatsStoreDir	Embedded NATS store directory for JetStream	If not set, auto-generated in the temp dir
env.anycableEnatsServerName	Embedded NATS unique server name	If not set, auto-generated
env.anycableEnatsDebug	Enable NATS server logs
env.anycableEnatsTrace	Enable NATS server protocol trace logs
env.anycableMaxMessageSize	Maximum size of a message in bytes	65536
env.anycableMaxConn	Limit simultaneous server connections	0 (no limit)
env.anycableShutdownTimeout	Graceful shutdown timeout (in seconds)	30
env.anycableDisconnectTimeout	[DEPRECATED] Graceful shutdown timeout (in seconds). Use env.anycableShutdownTimeout instead	5
env.anycableDisconnectRate	Max number of Disconnect calls per second	100
env.anycableShutdownPoolSize	Number of goroutines to use for disconnect calls on shutdown	16
env.anycableDisconnectBacklogSize	Size of the channel's buffer for disconnect requests	4096
env.anycableDisconnectMode	Define when to call Disconnect callback: auto, always, never	auto
env.anycableDisableDisconnect	[DEPRECATED] Disable calling Disconnect callback. Use env.anycableDisconnectMode=never instead	false
env.anycableReadBufferSize	WebSocket connection read buffer size	1024
env.anycableWriteBufferSize	WebSocket connection write buffer size	1024
env.anycableEnableWsCompression	Enable WebSocket per message compression	false
env.anycableHubGopoolSize	Size of the goroutines pool to broadcast messages	16
env.anycableAllowedOrigins	Accept requests only from specified origins. No check is performed if empty
env.anycablePingInterval	Action Cable ping interval (in seconds)	3
env.anycablePingTimestampPrecision	Precision for timestamps in ping messages (s, ms, ns)	s
env.anycablePongTimeout	How long to wait for a pong response before disconnecting the client (in seconds). Zero means no pongs required	0
env.anycableJwtIdKey	Encryption key used to verify JWT tokens
env.anycableJwtIdParam	Name of a query string param or an HTTP header carrying a token	jid
env.anycableJwtIdEnforce	Whether to enforce token presence for all connections	false
env.anycableTurboRailsKey	Enable Turbo Streams fastlane with the specified signing key
env.anycableTurboRailsCleartext	Enable Turbo Streams fastlane without stream names signing	false
env.anycableCableReadyKey	Enable CableReady fastlane with the specified signing key
env.anycableCableReadyCleartext	Enable Cable Ready fastlane without stream names signing	false
env.anycableSse	Enable SSE endpoint	false
env.anycableSsePath	SSE endpoint path	/events
command	Override entrypoint for Alpine images	/usr/local/bin/anycable-go
args	Customize ARGV (in addition to env settings above)	[]

Kubernetes

Value	Description	Default
replicas	Number of replicas for anycable-go deployment (ignored when HPA is enabled)	1
hpa.enabled	Enable HorizontalPodAutoscaler	false
hpa.minReplicas	Minimum replicas for HPA	1
hpa.maxReplicas	Maximum replicas for HPA	3
hpa.targetCPUUtilizationPercentage	Target CPU utilization for HPA	50
pod.annotations	User-specified Pod annotations	{}
pod.extraLabels	User-specified Pod Labels	{}
pod.tolerations	User-specified Pod tolerations	[]
pod.serviceAccountName	User-specified ServiceAccount for Pod identity
service.annotations	User-specified Service annotations	{}

Monitoring

Value	Description	Default
env.anycableLogLevel	Set logging level (debug/info/warn/error/fatal)	info
env.anycableLogFormat	Set logging format (text, json)	text
env.anycableDebug	Enable debug mode (more verbose logging)
env.anycableHealthPath	HTTP health endpoint path	/health
env.anycableMetricsLog	Enable metrics logging (with info level)
env.anycableMetricsRotateInterval	Specify how often to flush metrics to writers (logs, statsd) (in seconds)	15
env.anycableMetricsLogInterval	[DEPRECATED] Specify how often flush metrics logs. Use env.anycableMetricsRotateInterval instead	15
env.anycableMetricsLogFormatter	Specify the path to custom Ruby formatter script (only supported on MacOS and Linux)
env.anycableMetricsHttp	Enable HTTP metrics endpoint at the specified path	/metrics
env.anycableMetricsHost	Server host for metrics endpoint, default: the same as for main server
env.anycableMetricsPort	Server port for metrics endpoint, default: the same as for main server	8081
env.anycableMetricsTags	Comma-separated list of default (global) tags to add to every metric
env.anycableMetricsLogFilter	Specify list of metrics to print to log
env.anycableStatsRefreshInterval	How often to refresh the server stats (in seconds)	5
env.anycableStatsdHost	Server host for metrics sent to statsd server
env.anycableStatsdPrefix	Statsd metrics prefix	anycable_go.
env.anycableStatsdMaxPacketSize	Statsd client maximum UDP packet size	1400
env.anycableStatsdTagsFormat	One of "datadog", "influxdb", or "graphite"	datadog
serviceMonitor.enabled	Enable creation of ServiceMonitor resource for automatic metrics discovery by Prometheus operator	false
serviceMonitor.namespace	Namespace to create ServiceMonitor in (if differs from chart's namespace)	chart's namespace
serviceMonitor.interval	Metrics scrape interval	Prometheus default
serviceMonitor.labels	Labels that should be present in service monitor to be discovered	{}

Ingress configuration

Value	Description	Default
ingress.enable	When true, enables ingress resource for anycable	false
ingress.host	Hostname for the ingress resource to use	example.com
ingress.path	When true, enables ingress resource for anycable	/cable
ingress.acme	Enables the ingress resource annotation which tells cert-manager to issue a Let's Encrypt certificate	{}
ingress.nonAcme	Enables the ingress resource annotation which tells cert-manager to use existing certificate	{ hosts: [] }
ingress.annotations	Additional annotations for the ingress resource

SSL/TLS configuration

Only in case if you can't terminate SSL at Ingress controller or need encryption inside your cluster.

Value	Description	Default
tls.secretName	Specify name of TLS secret to use. Existing secret will be used if you don't provide certificate and key
tls.crt	Specify full certificate chain in PEM format to be written in new TLS secret
tls.key	Specify private key in PEM format to be written in new TLS secret

See values.yaml for some more Kubernetes-specific configuration options.

Custom ENV values

When a new version of anycable become available, the chart can be not updated yet. In this case you would need to add new environment variables to the application. These variables can be added to the env.custom section of values. Under the hood, custom env variables are passed to the container through the secret.

# ...
env:
  # ...
  custom:
    NEW_FEATURE: foobar

Configuration examples

Encrypting communication between ingress-nginx and anycable-go using private CA

0. Obtain certificate/key pair for anycable-go and CA root certificate for ingress-nginx from your CA.

   For testing purposes you can generate your own CA with following commands:

   # Generate one-time private CA
   openssl req -x509 -sha256 -newkey rsa:4096 -keyout ca.key -out ca.crt -days 356 -nodes -subj '/CN=Fake CA'
   # Issue certificate for anycable-go using it
   openssl req -new -newkey rsa:4096 -keyout server.key -out server.csr -nodes -subj '/CN=anycable-go'
   openssl x509 -req -sha256 -days 365 -in server.csr -CA ca.crt -CAkey ca.key -set_serial 01 -out server.crt

   See kubernetes/ingress-nginx#4503 (comment) for details.

1. Place private CA root certificate into separate secret containing only ca.crt key:

   kubectl create secret generic ca-private --from-file=ca.crt=ca.crt

   See kubernetes/ingress-nginx#4688 for details

   Place certificate/key pair for anycable-go into separate TLS secret

   kubectl create secret tls anycable-go-tls-private --from-file=tls.crt=server.crt --from-file=tls.key=server.key

2. Reference secret with CA root certificate in the nginx.ingress.kubernetes.io/proxy-ssl-secret annotation (with namespace)

3. Specify HTTPS as upstream protocol in nginx.ingress.kubernetes.io/backend-protocol annotation.

4. Specify anycable-go certificate's CN (or one of AltSubjectNames) in proxy_ssl_name directive in configuration snippet. Nginx sends the content of $proxy_host variable by default and in nginx-ingress always sends upstream_balancer as hostname in SNI extension and we need override it.

5. Enable upstream SSL verification by setting nginx.ingress.kubernetes.io/proxy-ssl-verify annotation to 'on'

Complete example:

# values.yaml
fullNameOverride: anycable-go
ingress:
  enable: true
  path: /cable
  acme:
    hosts:
      - example.com
  annotations:
    nginx.ingress.kubernetes.io/backend-protocol: HTTPS
    nginx.ingress.kubernetes.io/configuration-snippet: |
      proxy_ssl_name anycable-go;
    nginx.ingress.kubernetes.io/proxy-ssl-secret: default/ca-private
    nginx.ingress.kubernetes.io/proxy-ssl-verify: 'on'
tls:
  secretName: anycable-go-tls

Development

Upgrading charts

1. Clone this repository

2. Update your chart, bump version in its Chart.yaml

3. Lint you chart:

   helm lint anycable-go

4. Commit and push your changes:

   git commit -m "anycable-go: vX.Y.Z"
   git tag anycable-go-X.Y.Z -s -m "anycable-go chart vX.Y.Z for app version A.B.C"
   git push --follow-tags

5. Enjoy!