vmauth

README

vmauth

vmauth is a simple auth proxy and router for VictoriaMetrics. It reads username and password from Basic Auth headers, matches them against configs pointed by -auth.config command-line flag and proxies incoming HTTP requests to the configured per-user url_prefix on successful match.

Quick start

Just download vmutils-* archive from releases page, unpack it and pass the following flag to vmauth binary in order to start authorizing and routing requests:

/path/to/vmauth -auth.config=/path/to/auth/config.yml

After that vmauth starts accepting HTTP requests on port 8427 and routing them according to the provided -auth.config. The port can be modified via -httpListenAddr command-line flag.

The auth config can be reloaded by passing SIGHUP signal to vmauth.

Docker images for vmauth are available here.

Pass -help to vmauth in order to see all the supported command-line flags with their descriptions.

Feel free contacting us if you need customized auth proxy for VictoriaMetrics with the support of LDAP, SSO, RBAC, SAML, accounting, limits, etc.

Auth config

Auth config is represented in the following simple yml format:

# Arbitrary number of usernames may be put here.
# Usernames must be unique.

users:

  # The user for querying local single-node VictoriaMetrics.
  # All the requests to http://vmauth:8427 with the given Basic Auth (username:password)
  # will be routed to http://localhost:8428 .
  # For example, http://vmauth:8427/api/v1/query is routed to http://localhost:8428/api/v1/query
- username: "local-single-node"
  password: "***"
  url_prefix: "http://localhost:8428"

  # The user for querying account 123 in VictoriaMetrics cluster
  # See https://github.com/VictoriaMetrics/VictoriaMetrics/blob/cluster/README.md#url-format
  # All the requests to http://vmauth:8427 with the given Basic Auth (username:password)
  # will be routed to http://vmselect:8481/select/123/prometheus .
  # For example, http://vmauth:8427/api/v1/query is routed to http://vmselect:8481/select/123/prometheus/api/v1/select
- username: "cluster-select-account-123"
  password: "***"
  url_prefix: "http://vmselect:8481/select/123/prometheus"

  # The user for inserting Prometheus data into VictoriaMetrics cluster under account 42
  # See https://github.com/VictoriaMetrics/VictoriaMetrics/blob/cluster/README.md#url-format
  # All the reuqests to http://vmauth:8427 with the given Basic Auth (username:password)
  # will be routed to http://vminsert:8480/insert/42/prometheus .
  # For example, http://vmauth:8427/api/v1/write is routed to http://vminsert:8480/insert/42/prometheus/api/v1/write
- username: "cluster-insert-account-42"
  password: "***"
  url_prefix: "http://vminsert:8480/insert/42/prometheus"

The config may contain %{ENV_VAR} placeholders, which are substituted by the corresponding ENV_VAR environment variable values. This may be useful for passing secrets to the config.

Security

Do not transfer Basic Auth headers in plaintext over untrusted networks. Enable https. This can be done by passing the following -tls* command-line flags to vmauth:

  -tls
    	Whether to enable TLS (aka HTTPS) for incoming requests. -tlsCertFile and -tlsKeyFile must be set if -tls is set
  -tlsCertFile string
    	Path to file with TLS certificate. Used only if -tls is set. Prefer ECDSA certs instead of RSA certs, since RSA certs are slow
  -tlsKeyFile string
    	Path to file with TLS key. Used only if -tls is set

Alternatively, https termination proxy may be put in front of vmauth.

Monitoring

vmauth exports various metrics in Prometheus exposition format at http://vmauth-host:8427/metrics page. It is recommended setting up regular scraping of this page either via vmagent or via Prometheus, so the exported metrics could be analyzed later.

How to build from sources

It is recommended using binary releases - vmauth is located in vmutils-* archives there.

Development build

1. Install Go. The minimum supported version is Go 1.13.
2. Run make vmauth from the root folder of the repository. It builds vmauth binary and puts it into the bin folder.

Production build

1. Install docker.
2. Run make vmauth-prod from the root folder of the repository. It builds vmauth-prod binary and puts it into the bin folder.

Building docker images

Run make package-vmauth. It builds victoriametrics/vmauth:<PKG_TAG> docker image locally. <PKG_TAG> is auto-generated image tag, which depends on source code in the repository. The <PKG_TAG> may be manually set via PKG_TAG=foobar make package-vmauth.

The base docker image is alpine but it is possible to use any other base image by setting it via <ROOT_IMAGE> environment variable. For example, the following command builds the image on top of scratch image:

ROOT_IMAGE=scratch make package-vmauth

Profiling

vmauth provides handlers for collecting the following Go profiles:

• Memory profile. It can be collected with the following command:

curl -s http://<vmauth-host>:8427/debug/pprof/heap > mem.pprof

• CPU profile. It can be collected with the following command:

curl -s http://<vmauth-host>:8427/debug/pprof/profile > cpu.pprof

The command for collecting CPU profile waits for 30 seconds before returning.

The collected profiles may be analyzed with go tool pprof.

Advanced usage

Pass -help command-line arg to vmauth in order to see all the configuration options:

./vmauth -help

vmauth authenticates and authorizes incoming requests and proxies them to VictoriaMetrics.

See the docs at https://github.com/VictoriaMetrics/VictoriaMetrics/blob/master/app/vmauth/README.md .

  -auth.config string
    	Path to auth config. See https://github.com/VictoriaMetrics/VictoriaMetrics/blob/master/app/vmauth/README.md for details on the format of this auth config
  -enableTCP6
    	Whether to enable IPv6 for listening and dialing. By default only IPv4 TCP is used
  -envflag.enable
    	Whether to enable reading flags from environment variables additionally to command line. Command line flag values have priority over values from environment vars. Flags are read only from command line if this flag isn't set
  -envflag.prefix string
    	Prefix for environment variables if -envflag.enable is set
  -http.connTimeout duration
    	Incoming http connections are closed after the configured timeout. This may help spreading incoming load among a cluster of services behind load balancer. Note that the real timeout may be bigger by up to 10% as a protection from Thundering herd problem (default 2m0s)
  -http.disableResponseCompression
    	Disable compression of HTTP responses for saving CPU resources. By default compression is enabled to save network bandwidth
  -http.idleConnTimeout duration
    	Timeout for incoming idle http connections (default 1m0s)
  -http.maxGracefulShutdownDuration duration
    	The maximum duration for graceful shutdown of HTTP server. Highly loaded server may require increased value for graceful shutdown (default 7s)
  -http.pathPrefix string
    	An optional prefix to add to all the paths handled by http server. For example, if '-http.pathPrefix=/foo/bar' is set, then all the http requests will be handled on '/foo/bar/*' paths. This may be useful for proxied requests. See https://www.robustperception.io/using-external-urls-and-proxies-with-prometheus
  -http.shutdownDelay duration
    	Optional delay before http server shutdown. During this dealy the servier returns non-OK responses from /health page, so load balancers can route new requests to other servers
  -httpAuth.password string
    	Password for HTTP Basic Auth. The authentication is disabled if -httpAuth.username is empty
  -httpAuth.username string
    	Username for HTTP Basic Auth. The authentication is disabled if empty. See also -httpAuth.password
  -httpListenAddr string
    	TCP address to listen for http connections (default ":8427")
  -loggerErrorsPerSecondLimit int
    	Per-second limit on the number of ERROR messages. If more than the given number of errors are emitted per second, then the remaining errors are suppressed. Zero value disables the rate limit (default 10)
  -loggerFormat string
    	Format for logs. Possible values: default, json (default "default")
  -loggerLevel string
    	Minimum level of errors to log. Possible values: INFO, WARN, ERROR, FATAL, PANIC (default "INFO")
  -loggerOutput string
    	Output for the logs. Supported values: stderr, stdout (default "stderr")
  -memory.allowedBytes value
    	Allowed size of system memory VictoriaMetrics caches may occupy. This option overrides -memory.allowedPercent if set to non-zero value. Too low value may increase cache miss rate, which usually results in higher CPU and disk IO usage. Too high value may evict too much data from OS page cache, which will result in higher disk IO usage
    	Supports the following optional suffixes for values: KB, MB, GB, KiB, MiB, GiB (default 0)
  -memory.allowedPercent float
    	Allowed percent of system memory VictoriaMetrics caches may occupy. See also -memory.allowedBytes. Too low value may increase cache miss rate, which usually results in higher CPU and disk IO usage. Too high value may evict too much data from OS page cache, which will result in higher disk IO usage (default 60)
  -metricsAuthKey string
    	Auth key for /metrics. It overrides httpAuth settings
  -pprofAuthKey string
    	Auth key for /debug/pprof. It overrides httpAuth settings
  -tls
    	Whether to enable TLS (aka HTTPS) for incoming requests. -tlsCertFile and -tlsKeyFile must be set if -tls is set
  -tlsCertFile string
    	Path to file with TLS certificate. Used only if -tls is set. Prefer ECDSA certs instead of RSA certs, since RSA certs are slow
  -tlsKeyFile string
    	Path to file with TLS key. Used only if -tls is set
  -version
    	Show VictoriaMetrics version