pixa/config.example.yml

# Pixa Example Configuration
#
# Every key can also be set by an environment variable, which wins over
# this file: PIXA_ plus the key in upper case, with "." written as "_"
# (state_dir is PIXA_STATE_DIR, metrics.username is
# PIXA_METRICS_USERNAME). The one exception is port, which is set by
# PORT. In a variable, a list is comma-separated. A variable named in
# this file's env: section is set while the file loads, so it overrides
# both the environment the process was started with and this file's own
# key.
#
# Durations are Go duration strings such as 30s or 2m and must be
# positive; a bare number has no unit and aborts startup. Sizes are a
# whole number of bytes.

# Server settings
port: 8080
debug: false

# While true, the image routes (/v1/image/ and /v1/e/) answer every request
# with 503 and a Retry-After header. The health check keeps answering 200 and
# reports maintenance_mode as true. It stays 200 because the image's Docker
# HEALTHCHECK requests it: a 503 there would make the container unhealthy, and
# upaas marks a deploy failed when its container is unhealthy.
maintenance_mode: false

# Data directory for SQLite database and cache files
state_dir: ./data

# Image proxy settings
# HMAC signing key for URL signatures (required, at least 32 characters)
# Generate with: openssl rand -base64 32
signing_key: "CHANGE_ME_generate_with_openssl_rand_base64_32"

# Hosts that don't require signatures
# Use "." prefix for wildcard subdomain matching (e.g., ".example.com" matches "cdn.example.com")
allowlist_hosts:
  - s3.sneak.cloud
  - static.sneak.cloud
  - sneak.berlin
  - github.com
  - user-images.githubusercontent.com

# Additional CIDR ranges to refuse when fetching upstream, extending the
# SSRF protection. These are added to the always-enforced built-in ranges
# (loopback, RFC 1918 private, link-local, CGNAT, benchmark, NAT64, and
# similar), never replacing them. Each entry must be a valid CIDR in IPv4
# or IPv6 form; an invalid entry aborts startup.
# blocked_networks:
#   - 100.64.0.0/10
#   - 2001:db8::/32

# CIDR ranges of the reverse proxies in front of pixa. X-Forwarded-For
# is believed only when the direct peer is inside one of these ranges;
# the client address in the access log and login records is then the
# rightmost forwarded entry that is not itself a trusted proxy. A client
# connecting directly (peer outside these ranges) cannot spoof its
# address: the header is ignored and the peer address is used. When
# omitted, this defaults to the RFC 1918 private ranges (10.0.0.0/8,
# 172.16.0.0/12, 192.168.0.0/16), since pixa is deployed behind a proxy on
# a private network. An explicitly empty list ([]) trusts no one; an
# explicit list replaces the default. An invalid CIDR aborts startup.
# Uncomment to override the defaults with the address pixa sees for
# requests that come through your proxy. That is not always the proxy's own
# address: a proxy on the Docker host that connects over 127.0.0.1 is seen
# as the gateway of the container's Docker network (172.17.0.1 on the
# default bridge), and one that connects through another host address is
# seen with that address. To be sure, look it up in the request log as the
# trusted_proxies entry in README.md describes.
# trusted_proxies:
#   - 10.0.0.0/8
#   - 2001:db8::/32

# Allow HTTP upstream (only for testing, always use HTTPS in production)
allow_http: false

# Maximum concurrent connections per upstream host (default: 20)
upstream_connections_per_host: 20

# Maximum concurrent connections to all upstream hosts together, on top of
# the per-host limit (default: 64). A fetch holds its connection until its
# image has been processed. A fetch that finds none free waits up to 10
# seconds for one, and if none frees up the request is answered 503, unless
# downstream_timeout has ended first.
upstream_connections: 64

# Maximum number of images decoded and encoded at once (default: the
# number of CPUs pixa can use, which follows a container's CPU limit). A
# request that finds none free waits up to 10 seconds for one, and if none
# frees up it is answered 503, unless downstream_timeout has ended first.
# max_concurrent_processing: 4

# Time allowed for one fetch from an upstream host (default: 30s)
upstream_fetch_timeout: 30s

# Largest upstream response accepted, in bytes, at most 1073741824
# (1 GiB) (default: 52428800, 50 MiB)
upstream_max_response_size: 52428800

# Time allowed for answering one client request (default: 60s). The
# upstream fetch counts toward it, and so do the waits for an upstream
# connection and for a processing slot (up to 10 seconds each), so keep it
# longer than upstream_fetch_timeout plus 20 seconds.
downstream_timeout: 60s

# The origin a browser lets read pixa's responses, sent as the CORS
# Access-Control-Allow-Origin header: "*" (the default) is any site;
# otherwise one http or https origin such as https://example.com, whose
# host is a lowercase host name (letters, digits, hyphens and dots, with a
# letter in its last part) or an IP address (IPv6 in brackets, in its
# shortest form), with an optional port 1-65535 that has no leading zero
# and is not the scheme's default. Any other value, including another
# scheme such as a browser extension's, aborts startup.
access_control_allow_origin: "*"

# Maximum disk cache size in bytes. Explicit values are used exactly as
# given; 0 disables the disk cache entirely (every request fetches and
# processes uncached). When omitted, the default is 75% of the free
# space on the filesystem containing <state_dir>/cache/ at startup,
# with a minimum of 500 MiB.
# cache_max_bytes: 10737418240

# Sentry error reporting (optional)
sentry_dsn: ""

# Metrics endpoint authentication (optional)
# metrics:
#   username: "admin"
#   password: "secret"