[SOLR-10352] Low entropy warning in bin/solr script

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 7.0
• Component/s: SolrCLI
• Assignee: Unassigned
• Reporter: Ishan Chattopadhyaya
• Created: 23/Mar/17 18:05
• Updated: 24/Sep/23 18:44
• Resolved: 23/Mar/18 21:29

Description

We should add a warning in the startup script for Linux, if the output of the following is below a certain threshold (maybe 300?). The warning could indicate that features like UUIDField, SSL etc. might not work properly (or be slow). As a hint, we could then suggest the user to configure a non blocking SecureRandom (SOLR-10338) or install rng-tools, haveged etc.

cat /proc/sys/kernel/random/entropy_avail

Original discussion:
https://issues.apache.org/jira/browse/SOLR-10338?focusedCommentId=15938904&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15938904