Scrape redis instances with passwords not working

[siitao]

I use file_sd_configs to monitor multiple redis instances But the connection authentication fails with redis://h:password@ip:port. Prompt for the following error ，The password is correct

redis_exporter_last_scrape_error{err="NOAUTH Authentication required."} 1

redis version

Redis server v=3.2.5 sha=00000000:0 malloc=jemalloc-4.0.3 bits=64 build=851d3fa91d926a59

Redis_exporter startup method

./redis_exporter -redis.addr=

details

[root@aa-test-1-11 ]# curl http://172.16.1.10:9121/scrape?target=redis://h:[email protected]:6379
# HELP redis_exporter_build_info redis exporter build_info
# TYPE redis_exporter_build_info gauge
redis_exporter_build_info{build_date="<<< filled in by build >>>",commit_sha="<<< filled in by build >>>",golang_version="go1.13.1",version="<<< filled in by build >>>"} 1
# HELP redis_exporter_last_scrape_duration_seconds exporter_last_scrape_duration_seconds metric
# TYPE redis_exporter_last_scrape_duration_seconds gauge
redis_exporter_last_scrape_duration_seconds 0.001855103
# HELP redis_exporter_last_scrape_error The last scrape error status.
# TYPE redis_exporter_last_scrape_error gauge
redis_exporter_last_scrape_error{err="NOAUTH Authentication required."} 1
# HELP redis_exporter_scrape_duration_seconds Duration of scrape by the exporter
# TYPE redis_exporter_scrape_duration_seconds summary
redis_exporter_scrape_duration_seconds{quantile="0.5"} NaN
redis_exporter_scrape_duration_seconds{quantile="0.9"} NaN
redis_exporter_scrape_duration_seconds{quantile="0.99"} NaN
redis_exporter_scrape_duration_seconds_sum 0
redis_exporter_scrape_duration_seconds_count 0
# HELP redis_exporter_scrapes_total Current total redis scrapes.
# TYPE redis_exporter_scrapes_total counter
redis_exporter_scrapes_total 1
# HELP redis_target_scrape_request_errors_total Errors in requests to the exporter
# TYPE redis_target_scrape_request_errors_total counter
redis_target_scrape_request_errors_total 0
# HELP redis_up Information about the Redis instance
# TYPE redis_up gauge
redis_up 0

[oliver006]

Using the password as part of the redis URI is not supported, you can configure the password to use via the command line by using --redis.password.

If you have different passwords for each redis instance then this is not currently possible to use the same redis_exporter for all of them, see #278 for a discussion of the issue

[fsckzy]

I want to ask why I am prompted for authentication failure? The password is fine

nohup ./redis_exporter -redis.addr 172.18.11.139:7000 172.18.11.139:7001 172.18.11.140:7002 172.18.11.140:7003 172.18.11.141:7004 172.18.11.141:7005 -redis.password xxxxx &

tips:

level=error msg="Redis INFO err: NOAUTH Authentication required."

why?

[oliver006]

@fsckzy You can only provide one redis instance address as the parameter to the redis_exporter.

What happens if you run
./redis_exporter -redis.addr=172.18.11.139:7000 -redis.password=xxxxx
and try to retrieve the metrics ?

[fsckzy]

@fsckzy You can only provide one redis instance address as the parameter to the redis_exporter.

What happens if you run
./redis_exporter -redis.addr=172.18.11.139:7000 -redis.password=xxxxx
and try to retrieve the metrics ?

One instance will do. But I want to monitor the cluster. If the instance launches redis-exporter, many commands will not work, such as cluster slot failure. What is the solution?

[oliver006]

If you want to monitor the cluster then you'll need to scrape each of the instances.
You can do this by either running a redis_exporter per redis instance (sidecar in k8s or on the host if running on regular VMs) or you have a look at the docs here how to configure scraping multiple instances: https://github.com/oliver006/redis_exporter#prometheus-configuration-to-scrape-multiple-redis-hosts

[fsckzy]

If you want to monitor the cluster then you'll need to scrape each of the instances.
You can do this by either running a redis_exporter per redis instance (sidecar in k8s or on the host if running on regular VMs) or you have a look at the docs here how to configure scraping multiple instances: https://github.com/oliver006/redis_exporter#prometheus-configuration-to-scrape-multiple-redis-hosts

Thank you for your patience. I successfully monitored the Redis cluster. I do n’t know how to upload pictures, so I wo n’t pass them on.
But strangely, the redis_exporter log shows the following prompt:

time="2019-12-17T09:10:49+08:00" level=error msg="Couldn't connect to redis instance"

Prometheus can collect data, just curious。

[oliver006]

Are you using the multi-instance configuration? If yes, did you set the --redis.addr= command line parameter?

[fsckzy]

Are you using the multi-instance configuration? If yes, did you set the --redis.addr= command line parameter?

I do it like this：

nohup ./redis_exporter -redis.password xxxxx  &

  - job_name: 'redis_exporter_targets'
    static_configs:
      - targets:
        - redis://172.18.11.139:7000
        - redis://172.18.11.139:7001
        - redis://172.18.11.140:7002
        - redis://172.18.11.140:7003
        - redis://172.18.11.141:7004
        - redis://172.18.11.141:7005
    metrics_path: /scrape
    relabel_configs:
      - source_labels: [__address__]
        target_label: __param_target
      - source_labels: [__param_target]
        target_label: instance
      - target_label: __address__
        replacement: 172.18.11.139:9121

Can collect data。

[oliver006]

Cool. Just pass --redis.addr= to the redis_exporter and you won't see the error any longer.

[fsckzy]

thank you very much