Hello,
I've been facing the exact same issue today and its driving me equally 
crazy. I tried running prometheus as root but still:

level=error ts=2020-11-15T21:45:35.983Z caller=refresh.go:98 
component="discovery manager scrape" discovery=dockerswarm msg="Unable to 
refresh target groups" err="error while listing swarm *services*: Cannot 
connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker 
daemon running?"
level=error ts=2020-11-15T21:45:35.984Z caller=refresh.go:98 
component="discovery manager scrape" discovery=dockerswarm msg="Unable to 
refresh target groups" err="error while listing swarm *nodes*: Cannot 
connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker 
daemon running?"

I think I've exhausted all the options I could try by myself and would 
gladly appreciate any help at this point.
Le dimanche 15 novembre 2020 à 21:54:26 UTC+1, Julien Pivotto a écrit :

> Can you run prometheus as nobody:docker?
> On 15 Nov 12:23, Carlos Colaço wrote:
> > sorry .. also tried changing the permissions which changed nothing... 
> > 
> > ```
> > # chmod +r /var/run/docker.sock 
> > # ls -la /var/run/docker.sock 
> > srw-rw-r--. 1 root docker 0 Nov 15 20:12 /var/run/docker.sock
> > # docker service update --force monitor_private 
> > ```
> > 
> > On Sunday, November 15, 2020 at 9:20:07 PM UTC+1 Carlos Colaço wrote:
> > 
> > > Hi all .. Having the same issue... 
> > >
> > > https://github.com/prometheus/prometheus/issues/8185
> > >
> > >
> > > Also don't think changing permissions on docker sock is a good option 
> .. 
> > > that way you are giving permissions to anyone to access it and that is 
> > > something not desirable ... 
> > >
> > > What i also tried to do instead ... since prometheus runs as Nobody ( 
> uid: 
> > > 65534 ) ... i added it to the Docker group which changed nothing =/ 
> > >
> > > Any hints or solutions for this? driving me crazy trying different 
> > > approaches and solutions.. nothing seems to work ... 
> > >
> > > On Tuesday, August 11, 2020 at 7:03:12 AM UTC+2 [email protected] 
> wrote:
> > >
> > >> Thanks Julien and Tom, 
> > >>
> > >> I got the problem which i was facing, actually when we change the 
> > >> permissions to read-write for docker.sock, permissions are only 
> changed 
> > >> till the docker daemon or docker service is restarted. Once the 
> > >> docker/daemon is restarted then the permissions for docker sock 
> changes 
> > >> back to the original one. 
> > >>
> > >> Is there any way using which we can make permanent changes for the 
> > >> permission of docker.sock or do we need to file a issue for the same, 
> as 
> > >> docker/daemon might be restarted for various reasons
> > >>
> > >>
> > >> ?
> > >>
> > >> On Monday, 10 August 2020 12:40:17 UTC+5:30, Umang Goel wrote:
> > >>>
> > >>> Hello Julien, 
> > >>>
> > >>> group_add is not allowed in docker swarm. Do you have any other 
> > >>> workaround for this?
> > >>>
> > >>> --
> > >>> Umang 
> > >>>
> > >>> On Monday, 10 August 2020 12:20:51 UTC+5:30, Julien Pivotto wrote:
> > >>>>
> > >>>>
> > >>>> Can you use: 
> > >>>>
> > >>>> --group-add docker? 
> > >>>>
> > >>>> or in compose v2 file: 
> > >>>>
> > >>>> version: "2.4" 
> > >>>> services: 
> > >>>> prometheus: 
> > >>>> group_add: 
> > >>>> - docker 
> > >>>>
> > >>>>
> > >>>> On 09 Aug 22:48, Umang Goel wrote: 
> > >>>> > ls -l /var/run/docker.sock 
> > >>>> > 
> > >>>> > - srwxrw-rw- 1 root docker 0 Aug 7 11:31 /var/run/docker.sock 
> > >>>> after 
> > >>>> > making changes as per Tom, 
> > >>>> > 
> > >>>> > On Sunday, 9 August 2020 02:16:28 UTC+5:30, Julien Pivotto wrote: 
> > >>>> > > 
> > >>>> > > On 07 Aug 04:36, Umang Goel wrote: 
> > >>>> > > > Hello Tom, 
> > >>>> > > > 
> > >>>> > > > Even this is not working, I am still facing the same issue. 
> Can 
> > >>>> you help 
> > >>>> > > me 
> > >>>> > > > how did you implement it. 
> > >>>> > > 
> > >>>> > > 
> > >>>> > > What are you current permissions on the /var/run/docker.sock ? 
> > >>>> > > 
> > >>>> > > ls -l /var/run/docker.sock 
> > >>>> > > 
> > >>>> > > > 
> > >>>> > > > On Friday, 7 August 2020 16:47:23 UTC+5:30, Tom Kun wrote: 
> > >>>> > > > > 
> > >>>> > > > > Hello Umang, 
> > >>>> > > > > 
> > >>>> > > > > What are you current permissions on the 
> /var/run/docker.sock ? 
> > >>>> > > > > 
> > >>>> > > > > I faced the same issue, and to start and no rebuild the 
> > >>>> Prometheus 
> > >>>> > > image 
> > >>>> > > > > with the appropriate user. 
> > >>>> > > > > I put the rights to read and write the docker.socket. 
> > >>>> > > > > 
> > >>>> > > > > sudo chmod 766 /var/run/docker.sock 
> > >>>> > > > > 
> > >>>> > > > > I hope this gonna help you. 
> > >>>> > > > > 
> > >>>> > > > > 
> > >>>> > > > > On Friday, 7 August 2020 11:59:32 UTC+2, Umang Goel wrote: 
> > >>>> > > > >> 
> > >>>> > > > >> Hello Community, 
> > >>>> > > > >> 
> > >>>> > > > >> I tired using Docker Swarm Service Discovery in 
> prometheus, 
> > >>>> but 
> > >>>> > > facing 
> > >>>> > > > >> problems using it. I followed the docker swarm support 
> > >>>> documentation 
> > >>>> > > > >> <https://prometheus.io/docs/guides/dockerswarm/>. Created 
> a 
> > >>>> > > daemon.json 
> > >>>> > > > >> file and mounted /var/run/docker.sock in prometheus 
> container. 
> > >>>> > > Container is 
> > >>>> > > > >> giving permission denied error as prometheus is running as 
> > >>>> nobody and 
> > >>>> > > > >> doesn't have access to mounted /var/run/docker.sock. Below 
> is 
> > >>>> my 
> > >>>> > > > >> prometheus.yml. 
> > >>>> > > > >> Prometheus Version : v2.20.1 
> > >>>> > > > >> 
> > >>>> > > > >> prometheus: 
> > >>>> > > > >> image: prom/prometheus 
> > >>>> > > > >> networks: 
> > >>>> > > > >> - monitor 
> > >>>> > > > >> ports: 
> > >>>> > > > >> - "9090:9090" 
> > >>>> > > > >> command: 
> > >>>> > > > >> - '--config.file=/etc/prometheus/prometheus.yml' 
> > >>>> > > > >> - '--storage.tsdb.path=/prometheus' 
> > >>>> > > > >> - 
> > >>>> '--storage.tsdb.retention=${PROMETHEUS_RETENTION:-24h}' 
> > >>>> > > > >> volumes: 
> > >>>> > > > >> - prometheus:/prometheus 
> > >>>> > > > >> - /home/efs/devops/dsm:/etc/prometheus:ro 
> > >>>> > > > >> - /var/run/docker.sock:/var/run/docker.sock:ro 
> > >>>> > > > >> deploy: 
> > >>>> > > > >> mode: replicated 
> > >>>> > > > >> replicas: 1 
> > >>>> > > > >> resources: 
> > >>>> > > > >> limits: 
> > >>>> > > > >> memory: 1024M 
> > >>>> > > > >> reservations: 
> > >>>> > > > >> memory: 128M 
> > >>>> > > > >> 
> > >>>> > > > >> Prometheus.yml 
> > >>>> > > > >> 
> > >>>> > > > >> scrape_configs: 
> > >>>> > > > >> - job_name: 'docker' 
> > >>>> > > > >> dockerswarm_sd_configs: 
> > >>>> > > > >> - host: unix:///var/run/docker.sock 
> > >>>> > > > >> role: nodes 
> > >>>> > > > >> 
> > >>>> > > > >> Error: 
> > >>>> > > > >> [email protected] 
> > >>>> <javascript:> | 
> > >>>> > > level=error 
> > >>>> > > > >> ts=2020-08-06T07:21:19.106Z caller=refresh.go:98 
> > >>>> component="discovery 
> > >>>> > > > >> manager scrape" discovery=dockerswarm msg="Unable to 
> refresh 
> > >>>> target 
> > >>>> > > groups" 
> > >>>> > > > >> err="error while listing swarm nodes: Got permission 
> denied 
> > >>>> while 
> > >>>> > > trying to 
> > >>>> > > > >> connect to the Docker daemon socket at 
> > >>>> unix:///var/run/docker.sock: 
> > >>>> > > Get 
> > >>>> > > > >> \"http://%2Fvar%2Frun%2Fdocker.sock/v1.24/nodes\": dial 
> unix 
> > >>>> > > > >> /var/run/docker.sock: connect: permission denied 
> > >>>> > > > >> 
> > >>>> > > > > 
> > >>>> > > > 
> > >>>> > > > -- 
> > >>>> > > > 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] <javascript:>. 
> > >>>> > > > To view this discussion on the web visit 
> > >>>> > > 
> > >>>> 
> https://groups.google.com/d/msgid/prometheus-users/e5e55a73-7cc1-4c0c-99e3-0a09270df62bo%40googlegroups.com.
>  
>
> > >>>>
> > >>>> > > 
> > >>>> > > 
> > >>>> > > 
> > >>>> > > -- 
> > >>>> > > Julien Pivotto 
> > >>>> > > @roidelapluie 
> > >>>> > > 
> > >>>> > 
> > >>>> > -- 
> > >>>> > 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/e5614621-f57a-466e-befd-269bf77d69c8o%40googlegroups.com.
>  
>
> > >>>>
> > >>>>
> > >>>>
> > >>>> -- 
> > >>>> Julien Pivotto 
> > >>>> @roidelapluie 
> > >>>>
> > >>>
> > 
> > -- 
> > 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/e058c64f-3db4-45c2-9550-c8db557d2a2cn%40googlegroups.com
> .
>
>
> -- 
> Julien Pivotto
> @roidelapluie
>

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