Docker Swarm Service Discovery | Problem in Implementation
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Umang Goel
Aug 7, 2020, 5:59:32 AM8/7/20
to Prometheus Users
Hello Community,
I tired using Docker Swarm Service Discovery in prometheus, but facing problems using it. I followed the docker swarm support documentation. 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:monitor_promethe...@monitoring.dev.ai | 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
Tom Kun
Aug 7, 2020, 7:17:23 AM8/7/20
to Prometheus Users
Hello Umang,
I hope this gonna help you.
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.sockI hope this gonna help you.
Hello Community,
Error:
monitor_prometheus.1.uwda89...@monitoring.dev.ai | 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
Umang Goel
Aug 7, 2020, 7:36:54 AM8/7/20
to Prometheus Users
Hello Tom,
Even this is not working, I am still facing the same issue. Can you help me how did you implement it.
Julien Pivotto
Aug 8, 2020, 4:46:28 PM8/8/20
to Umang Goel, Prometheus Users
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.
> 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
> >> 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
> >>
> >
>
> --
> >> 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.
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--
Julien Pivotto
@roidelapluie
Umang Goel
Aug 10, 2020, 1:48:30 AM8/10/20
to Prometheus Users
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,
> >> monitor_prometheus.1.uwda89...@monitoring.dev.ai | 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 promethe...@googlegroups.com.
Julien Pivotto
Aug 10, 2020, 2:50:51 AM8/10/20
to Umang Goel, Prometheus Users
Can you use:
--group-add docker?
or in compose v2 file:
version: "2.4"
services:
prometheus:
group_add:
- docker
> > 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 promethe...@googlegroups.com <javascript:>.
> > > >> 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
> > > 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
> >
>
> > 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.
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--
Julien Pivotto
@roidelapluie
Umang Goel
Aug 10, 2020, 3:10:17 AM8/10/20
to Prometheus Users
Hello Julien,
group_add is not allowed in docker swarm. Do you have any other workaround for this?
--
Umang
> > > >> monitor_prometheus.1.uwda89...@monitoring.dev.ai <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 promethe...@googlegroups.com <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.
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Umang Goel
Aug 11, 2020, 1:03:12 AM8/11/20
to Prometheus Users
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
?
Carlos Colaço
Nov 15, 2020, 3:20:07 PM11/15/20
to Prometheus Users
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 ...
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 ...
Carlos Colaço
Nov 15, 2020, 3:23:57 PM11/15/20
to Prometheus Users
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
```
```
# 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
```
Julien Pivotto
Nov 15, 2020, 3:54:26 PM11/15/20
to Carlos Colaço, Prometheus Users
Can you run prometheus as nobody:docker?
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--
Julien Pivotto
@roidelapluie
> 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
Kimo
Nov 15, 2020, 4:52:07 PM11/15/20
to Prometheus Users
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.
Carlos Colaço
Nov 15, 2020, 5:19:36 PM11/15/20
to Prometheus Users
@jullient Pivotto .. not sure what you mean ... that group does not exist inside the container so don't think so ... maybe building a custom might do something similar ...
```
/prometheus $ cat /etc/group
root:x:0:
daemon:x:1:
bin:x:2:
sys:x:3:
adm:x:4:
tty:x:5:
disk:x:6:
lp:x:7:
mail:x:8:
kmem:x:9:
wheel:x:10:root
cdrom:x:11:
dialout:x:18:
floppy:x:19:
video:x:28:
audio:x:29:
tape:x:32:
www-data:x:33:
operator:x:37:
utmp:x:43:
plugdev:x:46:
staff:x:50:
lock:x:54:
netdev:x:82:
users:x:100:
nogroup:x:65534:
```
root:x:0:
daemon:x:1:
bin:x:2:
sys:x:3:
adm:x:4:
tty:x:5:
disk:x:6:
lp:x:7:
mail:x:8:
kmem:x:9:
wheel:x:10:root
cdrom:x:11:
dialout:x:18:
floppy:x:19:
video:x:28:
audio:x:29:
tape:x:32:
www-data:x:33:
operator:x:37:
utmp:x:43:
plugdev:x:46:
staff:x:50:
lock:x:54:
netdev:x:82:
users:x:100:
nogroup:x:65534:
```
Also ... setting the docker.sock read open doesn't make the fix .. so ... to me all of this sounds like a bug on how prometheus is trying to reach the docker.sock ... how the image is build .. I don't know ... but to me it sounds bug-ish ... but this seems to be being pretty ignored or not well documented ... which one? i don't know ... but seems i am not the only one getting crazy with this .. wish i could help more ... would be good if this gets some traction ... i'd be glad to run any tests to help finding the issue!
Ill try to dive in a bit more see how the images are being built and try to find any hints .. but not really sure where to look at.
Kind regards,
Alex Duzsardi
Nov 15, 2020, 5:53:50 PM11/15/20
to Kimo, Prometheus Users
This worked for me , although i'm not sure we should be running prometheus as root
version: '3.7'
services:
prometheus:
image: prom/prometheus:v2.21.0
services:
prometheus:
image: prom/prometheus:v2.21.0
command:
- '--config.file=/etc/prometheus/prometheus.yml'
- '--storage.tsdb.path=/prometheus'
- '--storage.tsdb.retention=${PROMETHEUS_RETENTION:-48h}'
user: root
volumes:
- /var/run/docker.sock:/var/run/docker.sock:ro
- ./prometheus.yml:/etc/prometheus/prometheus.yml
ports:
- target: 9090
published: 9090
mode: ingress
deploy:
labels:
- prometheus-job=prometheus
user: root
volumes:
- /var/run/docker.sock:/var/run/docker.sock:ro
- ./prometheus.yml:/etc/prometheus/prometheus.yml
ports:
- target: 9090
published: 9090
mode: ingress
deploy:
labels:
- prometheus-job=prometheus
mode: replicated
replicas: 1
resources:
limits:
memory: 2048M
reservations:
memory: 512M
reservations:
memory: 512M
To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/50d9a66e-5319-41a6-83ff-1836d86272d3n%40googlegroups.com.
Alexandru Duzsardi,
DevOps Engineer
Skype: alexinno83
GPG/PGP Key: https://keybase.io/aduzsardi/pgp_keys.asc
GitLab: https://gitlab.com/aduzsardi
GitHub: https://github.com/aduzsardi
LinkedIn: https://www.linkedin.com/in/aduzsardi
E-mail: alex.d...@infinitpartners.com
InFinIT Partners,
Address: Str. Macinului Nr. 17, Cluj-Napoca, Romania
Carlos Colaço
Nov 15, 2020, 7:30:19 PM11/15/20
to Prometheus Users
Aight .. that fixed it for me too, was about to test it when i decided to check in here first, so you were just faster :p
If prometheus should or not run as root ... I am not sure either ... I
think its a common practice to run stuff as root inside the containers
... Cadvisor seems to be running as root ... but i am not entirely sure
on this one, so take my words with a grain of salt.
It
should be however ... at least documented with a warning ... its quite late here already but i can
do it early in the morning tomorrow ... if any of you has the chance in the meantime to try and verify this ... there are some more tests that come to my mind ...
Could it be that docker is not letting "nobody" read the sock? Maybe Trying running Prometheus as another user instead of nobody or root?
If nobody tries this i can try it tomorrow and maybe open PR to documentation with info about this.
Kind regards.
Julien Pivotto
Nov 15, 2020, 7:44:27 PM11/15/20
to Carlos Colaço, Prometheus Users
On 15 Nov 16:30, Carlos Colaço wrote:
> Aight .. that fixed it for me too, was about to test it when i decided to
> check in here first, so you were just faster :p
>
>
> If prometheus should or not run as root ... I am not sure either ... I
> think its a common practice to run stuff as root inside the containers ...
> Cadvisor seems to be running as root ... but i am not entirely sure on
> this one, so take my words with a grain of salt.
>
> It should be however ... at least documented with a warning ... its quite
> late here already but i can do it early in the morning tomorrow ... if any
> of you has the chance in the meantime to try and verify this ... there are
> some more tests that come to my mind ...
>
> Could it be that docker is not letting "nobody" read the sock? Maybe Trying
> running Prometheus as another user instead of nobody or root?
>
> If nobody tries this i can try it tomorrow and maybe open PR to
> documentation with info about this.
I guess it all depends on your distribution and how you run docker. Can
> Aight .. that fixed it for me too, was about to test it when i decided to
> check in here first, so you were just faster :p
>
>
> If prometheus should or not run as root ... I am not sure either ... I
> think its a common practice to run stuff as root inside the containers ...
> Cadvisor seems to be running as root ... but i am not entirely sure on
> this one, so take my words with a grain of salt.
>
> It should be however ... at least documented with a warning ... its quite
> late here already but i can do it early in the morning tomorrow ... if any
> of you has the chance in the meantime to try and verify this ... there are
> some more tests that come to my mind ...
>
> Could it be that docker is not letting "nobody" read the sock? Maybe Trying
> running Prometheus as another user instead of nobody or root?
>
> If nobody tries this i can try it tomorrow and maybe open PR to
> documentation with info about this.
you explain more your setup?
> >> 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
> >> daemon running?"
> >> level=error ts=2020-11-15T21:45:35.984Z caller=refresh.go:98
> >> component="discovery manager scrape" discovery=dockerswarm msg="Unable to
> >> .
> >>
> >
> >
> > --
> > Alexandru Duzsardi,
> > *DevOps Engineer*
> > *Skype:* alexinno83
> > *GPG/PGP Key*: https://keybase.io/aduzsardi/pgp_keys.asc
> > *GitLab:* https://gitlab.com/aduzsardi
> > *GitHub:* https://github.com/aduzsardi
> > *LinkedIn:* https://www.linkedin.com/in/aduzsardi
> > *E-mail:* alex.d...@infinitpartners.com
> >
> > InFinIT Partners,
> > *Address:* Str. Macinului Nr. 17, Cluj-Napoca, Romania
> > *Web:* www.infinitpartners.com
> >
> >
>
> --
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> >
>
> --
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Julien Pivotto
@roidelapluie
Carlos Colaço
Nov 15, 2020, 8:12:48 PM11/15/20
to Prometheus Users
@julien ... Here:
Let me know if you need more details
Carlos Colaço
Nov 16, 2020, 5:43:44 AM11/16/20
to Prometheus Users
Hi all ...
as promised ... built a new image ... and ran prometheus as another user ...
Dockerfile:
```
FROM prom/prometheus
USER root
RUN addgroup -g 1000 prometheus
RUN adduser -D -H -u 1000 -G prometheus -s /bin/nologin prometheus
USER prometheus
```
Docker compose file:
- /var/run/docker.sock:/var/run/docker.sock:ro
deploy:
and the issue still persists, after some googling ... Apparently for a process to have access to the docker.sock withing the container, it needs to run as root, or one should use something as docker-socket-proxy.
If Prometheus team don't want to change the default way Prometheus runs inside a docker container, which i completely understand, a note about this should be added on the https://prometheus.io/docs/guides/dockerswarm/ page
as promised ... built a new image ... and ran prometheus as another user ...
Dockerfile:
```
FROM prom/prometheus
USER root
RUN addgroup -g 1000 prometheus
RUN adduser -D -H -u 1000 -G prometheus -s /bin/nologin prometheus
USER prometheus
```
Docker compose file:
```
version: '3.3'
services:
private:
image: 4s3ti/prometheus-test
ports:
- 9090:9090
networks:
- dockadmin_rp
- private
volumes:
- /srv/data/prometheus/config:/etc/prometheus
- /srv/data/prometheus/test-data:/prometheus
services:
private:
image: 4s3ti/prometheus-test
ports:
- 9090:9090
networks:
- dockadmin_rp
- private
volumes:
- /srv/data/prometheus/config:/etc/prometheus
- /srv/data/prometheus/test-data:/prometheus
- /var/run/docker.sock:/var/run/docker.sock:ro
deploy:
replicas: 1
restart_policy:
condition: on-failure
placement:
constraints:
- node.labels.type == private
networks:
private:
dockadmin_rp:
external: true
restart_policy:
condition: on-failure
placement:
constraints:
- node.labels.type == private
networks:
private:
dockadmin_rp:
external: true
```
and the issue still persists, after some googling ... Apparently for a process to have access to the docker.sock withing the container, it needs to run as root, or one should use something as docker-socket-proxy.
If Prometheus team don't want to change the default way Prometheus runs inside a docker container, which i completely understand, a note about this should be added on the https://prometheus.io/docs/guides/dockerswarm/ page
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