On 5/22/24 10:23, Jorge Sánchez Briantes wrote:
Due to Plesk requirements, if you need Solr and Zookeeper in the same
web server, they must be installed on a Docker container. I have
deployed it and I have a fresh Solr 9.6, and Zookeeper 3.9.2., running.
I have readthis page <https://solr.apache.org/guide/solr/latest/
deployment-guide/solr-in-docker.html>about Solr in Docker, but It
doesn't clarify me the next questions:
I don't know anything about plesk. I know what it is, but I have never
actually used it.
I also don't know much about how the internals of the solr docker image
work, but I am not completely clueless.
1.
After install it, I can't open Solr admin page, neither from
https://public_machine_ip:8983/Solr/Admin nor from ssh terminal via
wget to https://localhost:8983/Solr/Admin. It always gets connection
refused, but my firewall (Plesk) allow this port.
Do not expose Solr directly to the Internet. This is just a bad idea.
Getting connection refused most likely means that the traffic made it
through the firewall but that there was nothing listening on that port.
As I note below, I think that on the docker host, you would reach Solr
on port 32774, not 8983.
Some firewalls will block a connection with 'refused' but most just drop
the traffic.
2.
I want Solr can only be accessed by local pages. I have set
SOLR_JETTY_HOST and SOLR_ZK_EMBEDDED_HOST variables to 127.0.0.1.,
and I restarted both containers.
Solr 9.x defaults to only being accessible by localhost, though I think
the docker container changes that to 0.0.0.0 because the way docker
works means the connection will not be coming from localhost, it will be
coming from the docker network that runs on the docker host. You should
probably remove at least the SOLR_JETTY_HOST environment variable and
let the Solr docker container handle those. I don't know if
SOLR_ZK_EMBEDDED_HOST needs to be there or not. I have never used it,
but I do not run Solr in docker.
If I run "docker ps" I get the next result:
solr 127.0.0.1:32774->8983/tcp
zookeeper 127.0.0.1:32771->2181/tcp,.... <some other ports>
This would seem to indicate that although Solr runs inside the container
on port 8983, that it listens on the docker host on port 32774, and I
*think* that on the docker host, that only listens on localhost.
It looks like docker is also forwarding port 32771 to the ZK container
on port 2181. I am not sure whether Solr would need to connect to ZK on
port 32771 or not. You would probably be able to connect it to the ZK
container's internal address on 2181.
I am guessing that from the docker host, you would use
"http://localhost:32774"; to reach the admin UI.
Thanks,
Shawn
