solr - basic authentication

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(total beginner question alert!) I am trying to set basic authentication on SOLR 8.3 (docker container: FROM solr:8.3) following this doc:

I have added the /var/solr/data/security.json:

{
"authentication":{ 
   "blockUnknown": true, 
   "class":"solr.BasicAuthPlugin",
   "credentials":{"solr":"IV0EHq1OnNrj6gvRCwvFwTrZ1+z1oBbnQdiVC3otuq0= Ndd7LKvVBAaZIF0QAVi1ekCfAJXr1GGfLtRUXhgrF8c="}, 
   "realm":"My Solr users", 
   "forwardCredentials": false 
},
"authorization":{
   "class":"solr.RuleBasedAuthorizationPlugin",
   "permissions":[{"name":"security-edit",
      "role":"admin"}], 
   "user-role":{"solr":"admin"} 
}}

when I try to change the default admin pass:

curl --user solr:SolrRocks http://10.x.x.x:8983/solr/admin/authentication -H 'Content-type:application/json' -d '{"set-user": {"solr" : "MyNewSuperSecurePass" }}'

I get the error :

  "responseHeader":{
    "status":400,
    "QTime":1},
  "error":{
    "metadata":[
      "error-class","org.apache.solr.common.SolrException",
      "root-error-class","org.apache.solr.common.SolrException"],
    "msg":"No authentication plugin configured",
    "code":400}}
solr8 solr
1 Answers

I have found that this behavior is only when running solr in container. Basically the security.json file must be put at container build time. So I added to the Dockerfile:

FROM solr:8.3
ENV SOLR_USER="solr" \
    SOLR_GROUP="solr"
USER root
COPY --chown=solr:solr security/security.json /var/solr/data/security.json
USER $SOLR_USER

After this, the newly built container behaved as described in the documentations.

user_71034060
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