Failed to expose service when an ambassador container already exists

[laukaichung]

I have issues exposing the elasticsearch container on a remote server.

Here are the commands:

 dokku elasticsearch:create es
 dokku elasticsearch:expose es 127.0.0.1:9200 9300

The expose command produces this error:

docker: Error response from daemon: Conflict. The container name "/dokku.elasticsearch.es.ambassador" is already in use by container "b1648f0bded938e0e8deb5410484e352271e33dd73270549495dbaa9d3dfa5dc". You have to remove (or rename) that container to be able to reuse that name.

Still I try to run this command on my local machine to access the server using an ssh tunnel:

- ssh -o ExitOnForwardFailure=yes -f -N -L 9200:127.0.0.1:9200 "root@$SERVER_IP"

But the site http://127.0.0.1:9200/ still cannot be reached. I use similar methods to expose postgres and redis and they all work. No luck with elasticsearch.

This is the result of docker container ls. It looks like elasticsearch ambassador fails to be created.

CONTAINER ID   IMAGE                     COMMAND                  CREATED             STATUS             PORTS                      NAMES
4dcad31c1895   elasticsearch:7.14.1      "/bin/tini -- /usr/l…"   15 minutes ago      Up 15 minutes      9200/tcp, 9300/tcp         dokku.elasticsearch.es
ac8e6e4cb379   dokku/ambassador:0.3.3    "/entrypoint"            49 minutes ago      Up 49 minutes      127.0.0.1:6379->6379/tcp   dokku.redis.redis.ambassador
1777ef34467a   redis:6.2.6               "docker-entrypoint.s…"   49 minutes ago      Up 49 minutes      6379/tcp                   dokku.redis.redis
5b2eb4747cb7   dokku/ambassador:0.3.3    "/entrypoint"            About an hour ago   Up About an hour   127.0.0.1:5432->5432/tcp   dokku.postgres.db.ambassador
6783c6455fc5   my-pg/pg-aws:13.421   "docker-entrypoint.s…"   About an hour ago   Up About an hour   5432/tcp                   dokku.postgres.db

dokku elasticsearch:info es:

=====> es elasticsearch service information
       Config dir:          /var/lib/dokku/services/elasticsearch/es/config
       Config options:                               
       Data dir:            /var/lib/dokku/services/elasticsearch/es/data
       Dsn:                 http://dokku-elasticsearch-es:9200
       Exposed ports:       9200->127.0.0.1:9200 9300->9300 
       Id:                  8f67773673ce09189dbc4768b2a3ca80f5142bff60ab13ef89c1ac4b92852884
       Internal ip:         172.17.0.2               
       Links:               -                        
       Service root:        /var/lib/dokku/services/elasticsearch/es
       Status:              running                  
       Version:             elasticsearch:7.14.1 

[josegonzalez]

Try doing docker container ls -a, the container should show up there. You may try removing that container and retrying the expose.

I'll keep this ticket open since we should error better when the container exists but is stopped for whatever reason.

[laukaichung]

@josegonzalez
Thank you! Doing docker container ls -a makes the culprit show up. I remove that container docker rm b1648f0bded9. Unexpose and expose elasticsearch and http://127.0.0.1:9200 is accessible now.

CONTAINER ID   IMAGE                     COMMAND                  CREATED             STATUS             PORTS                      NAMES
8f67773673ce   elasticsearch:7.14.1      "/bin/tini -- /usr/l…"   19 minutes ago      Up 19 minutes      9200/tcp, 9300/tcp         dokku.elasticsearch.es
b1648f0bded9   dokku/ambassador:0.3.3    "/entrypoint"            About an hour ago   Created                                       dokku.elasticsearch.es.ambassador
ac8e6e4cb379   dokku/ambassador:0.3.3    "/entrypoint"            About an hour ago   Up About an hour   127.0.0.1:6379->6379/tcp   dokku.redis.redis.ambassador
1777ef34467a   redis:6.2.6               "docker-entrypoint.s…"   About an hour ago   Up About an hour   6379/tcp                   dokku.redis.redis

I used dokku ansible to install dokku, and had to run the playbook multiple times because of some errors. Maybe that is the reason why that dead container exists.