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nixos/prometheus-postfix-exporter: whitelist addr-family AF_UNIX

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Otherwise, `postfix_up{path="/var/lib/postfix/queue/public/showq"}` will
always be `0` indicating an postfix outage because this is a unix domain
socket that cannot be connected to:

    2021/12/03 14:50:46 Failed to scrape showq socket: dial unix /var/lib/postfix/queue/public/showq: socket: address family not supported by protocol
This commit is contained in:
Maximilian Bosch 2021-12-03 17:59:53 +01:00
parent 7fff1e9c0c
commit 8e6d403e65
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2 changed files with 6 additions and 0 deletions
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3
nixos/modules/services/monitoring/prometheus/exporters/postfix.nix
View file

@ -76,6 +76,9 @@ in
serviceOpts = {
serviceConfig = {
DynamicUser = false;
# By default, each prometheus exporter only gets AF_INET & AF_INET6,
# but AF_UNIX is needed to read from the `showq`-socket.
RestrictAddressFamilies = [ "AF_UNIX" ];
ExecStart = ''
${pkgs.prometheus-postfix-exporter}/bin/postfix_exporter \
--web.listen-address ${cfg.listenAddress}:${toString cfg.port} \

3
nixos/tests/prometheus-exporters.nix
View file

@ -861,6 +861,9 @@ let
wait_for_unit("prometheus-postfix-exporter.service")
wait_for_file("/var/lib/postfix/queue/public/showq")
wait_for_open_port(9154)
wait_until_succeeds(
"curl -sSf http://localhost:9154/metrics | grep 'postfix_up{path=\"/var/lib/postfix/queue/public/showq\"} 1'"
)
succeed(
"curl -sSf http://localhost:9154/metrics | grep 'postfix_smtpd_connects_total 0'"
)