Share config files across environments in Solr - solr

Question

We have several environments (incl. several development, staging and production), but currently copy and paste the Solr conf folders and setup solr-data-config.xml for each environment as the file has the environments details:
<dataConfig>
<dataSource name="ds-db" type="JdbcDataSource"
driver="com.mysql.jdbc.Driver"
url="jdbc:mysql://10.0.0.40:3306/***"
user="***"
password="**"/>
How can we separate the solr config from the environment data, so that we just have one config folder per search group and have separate environment data?

Answer 1

I would recommend to externalise the environment dependent parameters :
1) DIH
You can obtain this using placeholders :
e.g.
<dataConfig>
<dataSource name="ds-db" type="JdbcDataSource"
driver="com.mysql.jdbc.Driver"
url ="${dataimporter.request.url}"
user ="${dataimporter.request.user}"
password ="${dataimporter.request.password}"/>
2) Solrconfig
<requestHandler name="/dataimport" class="solr.DataImportHandler">
<lst name="defaults">
<str name="config">data-config.xml</str>
<str name="clean">true</str>
...
<str name="url">${db.url:defaultUrl}</str>
<str name="user">${db.user:defaultUser}</str>
<str name="password">${db.password:}</str>
...
</lst>
</requestHandler>
${environment_variable: "default" } is the syntax to use[1] .
Then you need to pass the variables as Java system properties for the Solr java process.
[1] https://lucene.apache.org/solr/guide/6_6/configuring-solrconfig-xml.html#Configuringsolrconfig.xml-JVMSystemProperties