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📄 introduction.md # Introduction The Prometheus Exporter Toolkit is a toolkit available to promote a common set of practices when developing in the Prometheus ecosystem. It is written in Golang. This documentation is the end user configuration. Developers documentation can be found on [pkg.go.dev](https://pkg.go.dev/github.com/prometheus/exporter-toolkit/). * [Web configuration](web-configuration.md)	389 B	2025-05-25 12:27
📄 web-config.yml # TLS and basic authentication configuration example. # # Additionally, a certificate and a key file are needed. tls_server_config: cert_file: server.crt key_file: server.key # Usernames and passwords required to connect. # Passwords are hashed with bcrypt: https://github.com/prometheus/exporter-toolkit/blob/master/docs/web-configuration.md#about-bcrypt. basic_auth_users: alice: $2y$10$mDwo.lAisC94iLAyP81MCesa29IzH37oigHC/42V2pdJlUprsJPze bob: $2y$10$hLqFl9jSjoAAy95Z/zw8Ye8wkdMBM8c5Bn1ptYqP/AXyV0.oy0S8m	518 B	2025-05-25 12:27
📄 web-configuration.md # Web configuration Exporters and services instrumented with the Exporter Toolkit share the same web configuration file format. This is experimental and might change in the future. To specify which web configuration file to load, use the `--web.config.file` flag. The file is written in [YAML format](https://en.wikipedia.org/wiki/YAML), defined by the scheme described below. Brackets indicate that a parameter is optional. For non-list parameters the value is set to the specified default. The file is read upon every http request, such as any change in the configuration, so the certificates are picked up immediately. Generic placeholders are defined as follows: * `<boolean>`: a boolean that can take the values `true` or `false` * `<filename>`: a valid path in the current working directory * `<secret>`: a regular string that is a secret, such as a password * `<string>`: a regular string ``` tls_server_config: # Certificate for server to use to authenticate to client. # Expected to be passed as a PEM encoded sequence of bytes as a string. # # NOTE: If passing the cert inline, cert_file should not be specified below. [ cert: <string> ] # Key for server to use to authenticate to client. # Expected to be passed as a PEM encoded sequence of bytes as a string. # # NOTE: If passing the key inline, key_file should not be specified below. [ key: <secret> ] # CA certificate for client certificate authentication to the server. # Expected to be passed as a PEM encoded sequence of bytes as a string. # # NOTE: If passing the client_ca inline, client_ca_file should not be specified below. [ client_ca: <string> ] # Certificate and key files for server to use to authenticate to client. cert_file: <filename> key_file: <filename> # Server policy for client authentication. Maps to ClientAuth Policies. # For more detail on clientAuth options: # https://golang.org/pkg/crypto/tls/#ClientAuthType # # NOTE: If you want to enable client authentication, you need to use # RequireAndVerifyClientCert. Other values are insecure. [ client_auth_type: <string> \| default = "NoClientCert" ] # CA certificate for client certificate authentication to the server. [ client_ca_file: <filename> ] # Verify that the client certificate has a Subject Alternate Name (SAN) # which is an exact match to an entry in this list, else terminate the # connection. SAN match can be one or multiple of the following: DNS, # IP, e-mail, or URI address from https://pkg.go.dev/crypto/x509#Certificate. [ client_allowed_sans: [ - <string> ] ] # Minimum TLS version that is acceptable. [ min_version: <string> \| default = "TLS12" ] # Maximum TLS version that is acceptable. [ max_version: <string> \| default = "TLS13" ] # List of supported cipher suites for TLS versions up to TLS 1.2. If empty, # Go default cipher suites are used. Available cipher suites are documented # in the go documentation: # https://golang.org/pkg/crypto/tls/#pkg-constants # # Note that only the cipher returned by the following function are supported: # https://pkg.go.dev/crypto/tls#CipherSuites [ cipher_suites: [ - <string> ] ] # prefer_server_cipher_suites controls whether the server selects the # client's most preferred ciphersuite, or the server's most preferred # ciphersuite. If true then the server's preference, as expressed in # the order of elements in cipher_suites, is used. [ prefer_server_cipher_suites: <bool> \| default = true ] # Elliptic curves that will be used in an ECDHE handshake, in preference # order. Available curves are documented in the go documentation: # https://golang.org/pkg/crypto/tls/#CurveID [ curve_preferences: [ - <string> ] ] http_server_config: # Enable HTTP/2 support. Note that HTTP/2 is only supported with TLS. # This can not be changed on the fly. [ http2: <boolean> \| default = true ] # List of headers that can be added to HTTP responses. [ headers: # Set the Content-Security-Policy header to HTTP responses. # Unset if blank. [ Content-Security-Policy: <string> ] # Set the X-Frame-Options header to HTTP responses. # Unset if blank. Accepted values are deny and sameorigin. # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options [ X-Frame-Options: <string> ] # Set the X-Content-Type-Options header to HTTP responses. # Unset if blank. Accepted value is nosniff. # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options [ X-Content-Type-Options: <string> ] # Set the X-XSS-Protection header to all responses. # Unset if blank. # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-XSS-Protection [ X-XSS-Protection: <string> ] # Set the Strict-Transport-Security header to HTTP responses. # Unset if blank. # Please make sure that you use this with care as this header might force # browsers to load Prometheus and the other applications hosted on the same # domain and subdomains over HTTPS. # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security [ Strict-Transport-Security: <string> ] ] # Usernames and hashed passwords that have full access to the web # server via basic authentication. If empty, no basic authentication is # required. Passwords are hashed with bcrypt. basic_auth_users: [ <string>: <secret> ... ] ``` [A sample configuration file](web-config.yml) is provided. ## About bcrypt There are several tools out there to generate bcrypt passwords, e.g. [htpasswd](https://httpd.apache.org/docs/2.4/programs/htpasswd.html): `htpasswd -nBC 10 "" \| tr -d ':\n'` That command will prompt you for a password and output the hashed password, which will look something like: `$2y$10$X0h1gDsPszWURQaxFh.zoubFi6DXncSjhoQNJgRrnGs7EsimhC7zG` The cost (10 in the example) influences the time it takes for computing the hash. A higher cost will end up slowing down the authentication process. Depending on the machine, a cost of 10 will take about ~70ms, whereas a cost of 18 can take up to a few seconds. That hash will be computed on the first authenticated HTTP request and then cached. ## Performance Basic authentication is meant for simple use cases, with a few users. If you need to authenticate a lot of users, it is recommended to use TLS client certificates, or to use a proper reverse proxy to handle the authentication.	6.32 KB	2025-05-25 12:27

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