blackbox_exporter applies the provided regular expression against the entire body.
This means in particular that if your body is something like ['O', 'K', '\n'] (O, followed by K, followed by a carriage return), the regular expression '^OK$' WILL NOT match because '$' anchors it to the end of the body, not the end of the line. In order to match lines, not the whole body, you have to write '(?m:^OK$)'. This will match 'OK' on a line by its own, but not say NOK on a line by its own. It will also match on a body like 'Something\nOK\nsomething\n'. I hope this helps, Marcelo On Mon, Mar 22, 2021 at 1:54 PM Yagyansh S. Kumar <[email protected]> wrote: > Hi Julius, > > Using the expression "^OK$" leads to the failure of all the checks for > which response was OK. This seems weird to me. Ideally, should have worked. > Any more workarounds or suggestions to achieve this? > > On Mon, Mar 22, 2021 at 9:38 PM Yagyansh S. Kumar < > [email protected]> wrote: > >> Thanks, Julius. >> >> On Mon, Mar 22, 2021 at 6:50 PM Julius Volz <[email protected]> >> wrote: >> >>> Hi, >>> >>> the Blackbox exporter doesn't do full-string matching for these regexes, >>> but substring matching, so it also matches if the body contains "OK" >>> anywhere (which is true for "NOK"). Try '^OK$` instead? >>> >>> Also, in case your HTTP endpoint returns a status code other than 2xx, >>> you will have to set the "valid_status_codes" list to the allowed ones (it >>> defaults to 2xx). >>> >>> Regards, >>> Julius >>> >>> On Mon, Mar 22, 2021 at 9:03 AM [email protected] < >>> [email protected]> wrote: >>> >>>> Can someone please help! I am confused here. >>>> >>>> On Monday, March 15, 2021 at 12:20:03 PM UTC+5:30 [email protected] >>>> wrote: >>>> >>>>> >>>>> Hi. I am using blackbox_exporter version 0.18.0 and I am using http >>>>> prober to check if the response by my URL is "OK" or not. Below is the >>>>> configuration of the module. >>>>> >>>>> http_healthcheck_ok: >>>>> prober: http >>>>> timeout: 10s >>>>> http: >>>>> valid_http_versions: ["HTTP/1.1", "HTTP/2.0", "HTTP/1.0"] >>>>> * fail_if_body_not_matches_regexp: ['OK']* >>>>> method: GET >>>>> no_follow_redirects: false >>>>> fail_if_ssl: false >>>>> fail_if_not_ssl: false >>>>> tls_config: >>>>> insecure_skip_verify: true >>>>> preferred_ip_protocol: "ip4" >>>>> >>>>> So, whenever my URL throws anything other than OK in the response >>>>> body, probe_failed_due_to_regex should 1 right? But when the URL was >>>>> throwing *NOK *as the response body, probe_failed_due_to_regex was >>>>> still 0, whereas it should be 1. Am I missing something here? >>>>> >>>>> Thanks in advance! >>>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Prometheus Users" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/prometheus-users/e6db4504-48e6-4ad9-a640-1e63dc6e472en%40googlegroups.com >>>> <https://groups.google.com/d/msgid/prometheus-users/e6db4504-48e6-4ad9-a640-1e63dc6e472en%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> >>> >>> -- >>> Julius Volz >>> PromLabs - promlabs.com >>> >> >> >> -- >> Thanks & Regards >> Yagyansh S. Kumar >> DevOps Engineer, Dailyhunt - Bangalore >> 8696078312,8209496395 >> > > > -- > Thanks & Regards > Yagyansh S. Kumar > DevOps Engineer, Dailyhunt - Bangalore > 8696078312,8209496395 > > -- > You received this message because you are subscribed to the Google Groups > "Prometheus Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/prometheus-users/CAFGi5vArLJ1m-2Huui6P50N6HFdwztTDw7m0-bC8fGhiV9q0fg%40mail.gmail.com > <https://groups.google.com/d/msgid/prometheus-users/CAFGi5vArLJ1m-2Huui6P50N6HFdwztTDw7m0-bC8fGhiV9q0fg%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- Marcelo Magallón -- You received this message because you are subscribed to the Google Groups "Prometheus Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/CABiJYgYsoPRsy%3DYskNG5VErhv9%3DtYNqh%3DJ47JJsGC2vHaMZRbw%40mail.gmail.com.
