Docker not found by swarm agent

Rancher 1.x
1

I’ve created a SWARM environment, added a host (same host which is running docker & the rancher-server container), ran the agent start script. All well & good so far. If I now add a project & try to run it, I get an error (logged in r-Swarm_swarm-agent_1):

time="2016-06-17T12:32:46Z" level=info msg="Running docker-compose [-p m up -d] in /tmp/docker-compose693709405" eventId=04ef0855-ce78-438d-a964-f20f0969b9f4
time="2016-06-17T12:32:46Z" level=info msg="output: Couldn't connect to Docker daemon at http://docker:2375 - is it running?" eventId=04ef0855-ce78-438d-a964-f20f0969b9f4
time="2016-06-17T12:32:46Z" level=info msg="output: " eventId=04ef0855-ce78-438d-a964-f20f0969b9f4

I have not set http://docker:2375 anywhere - it seems to be some (incorrect?) default.

Can anyone advise where DOCKER_HOST should be set such that r-Swarm_swarm-agent_1 picks up the change? Or is that not the correct soln?

2

Can you share your docker-compose.yml that you added for creating your project?

What version of Rancher are you running? What verison of Docker? And how many hosts?

I was able to add a simple docker-compose.yml into the “Add Project” section with no issues.

3

The same issue.

I have 3 VMs (1- for rancher server, 2- for agent nodes):
$ uname
Linux 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt25-1 x86_64 GNU/Linux
$ docker -v
Docker version 1.11.1, build 5604cbe
$ docker-compose -v
docker-compose version 1.7.1, build 0a9ab35

I use this commands to start rancher server and agents:
$ docker run -d
-v /home/user/rancher/mysql:/var/lib/mysql
-v /home/user/rancher:/var/log/mysql
-v /home/user/rancher/cattle:/var/lib/cattle
–restart=always
–name=rancher-server
-p 8080:8080
rancher/server

docker run -d --privileged
-v /var/run/docker.sock:/var/run/docker.sock
-v /var/lib/rancher:/var/lib/rancher
rancher/agent:v1.0.2 http://host.domen.com:8080/v1/scripts/vvvvvv…

docker-compose.yml content is:
grf:
image: grafana/grafana

When I start docker-compose.yml (Swarm environment -> Projects -> Add Project), I get an the same error:
Error (exit status 1: Couldn’t connect to Docker daemon at http://docker:2375 - is it running? If it’s at a non-standard location, specify the URL with the DOCKER_HOST environment variable. )

When I start docker-compose.yml (Swarm environment -> System -> Add Stack), I get service in running state (Running grf_grf_1).

Any ideas? How can I fix the error with connection to the daemon?

4

Is the docker daemon on your VM instances configured to allow connection to either tcp port 2375 (insecure) or 2376 (tls) as in -H 0.0.0.0:2375 ?

5

Sorry for the late reply! I have since collected some additional info:

rancher server 1.1.0
rancher agent v1.0.2
rancher agent instance v0.8.1
rancher swarm agent 0.1.2
docker 1.10.2 (latest version I could find built against go 1.5)

Now running with a single host.

I’ve simplified the compose file to a minimum:

mysql-docker:
user: 498:496
image: localhost:5000/sles12sp1-mysql:5.7.12
volumes:

  • /home/docker_mysql:/var/lib/mysql

The r-Swarm_swarm-agent_1 container has a DOCKER_HOST env var referring to ‘docker’ defined, which none of the other containers seem to have:

docker exec -ti r-Swarm_swarm-agent_1 env | grep DOCKER
DOCKER_HOST=tcp://docker:2375
DOCKER_NAME=/cattle/docker

Note this does NOT happen when importing the same compose file via Swarm → System → Add Stack. There is runs the container as expected!

Where does the reference to ‘docker’ in DOCKER_HOST come form? It’s not in my DOCKER_OPS!

The log output form r-Swarm_swarm-agent_1 is:

time=“2016-08-18T13:57:42Z” level=info msg=“Received event: Name: composeProject.create, Event Id: 7cd35441-e590-4153-b7d7-cb3ce25dda12, Resource Id: 1e23”
time=“2016-08-18T13:57:42Z” level=info msg=“&{composeProject.create 7cd35441-e590-4153-b7d7-cb3ce25dda12 reply.2766177559194055484 1e23 environment map[environment:map[data:map[fields:map[templates:map[docker-compose:mysql-docker:\n user: 498:496\n image: localhost:5000/sles12sp1-mysql:5.7.12\n volumes:\n - /home/docker_mysql:/var/lib/mysql] previousExternalId:]] removeTime: created:1.471528662e+12 accountId:5 removed: description: kind:composeProject externalId: state:activating id:23 uuid:861fdea0-11c2-408f-841d-b3c3d8391e3d healthState:healthy name:test type:environment]]}” eventId=7cd35441-e590-4153-b7d7-cb3ce25dda12
time=“2016-08-18T13:57:42Z” level=info msg=“Running docker-compose [-p test up -d] in /tmp/docker-compose368297283” eventId=7cd35441-e590-4153-b7d7-cb3ce25dda12
time=“2016-08-18T13:57:42Z” level=info msg=“output: Couldn’t connect to Docker daemon at http://docker:2375 - is it running?” eventId=7cd35441-e590-4153-b7d7-cb3ce25dda12
time=“2016-08-18T13:57:42Z” level=info msg="output: " eventId=7cd35441-e590-4153-b7d7-cb3ce25dda12
time=“2016-08-18T13:57:42Z” level=info msg=“output: If it’s at a non-standard location, specify the URL with the DOCKER_HOST environment variable.” eventId=7cd35441-e590-4153-b7d7-cb3ce25dda12

6

Same when trying to start Wordpress from the Catalog:

exit status 1: Couldn’t connect to Docker daemon at http://docker:2375 - is it running?\n\nIf it’s at a non-standard location, specify the URL with the DOCKER_HOST environment variable.

On the host (which is NOT called ‘docker’):

root 27751 27750 1 Aug17 pts/6 00:25:49 docker daemon -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock