[SOLR-7562] ENABLE_REMOTE_JMX_OPTS=true without Host Name specified.

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 5.1
• Component/s: JMX, scripts and tools
• Labels: improvement suggestion

Environment

Centos 6.6

• Assignee: Unassigned
• Reporter: Shreejay
• Created: 19/May/15 00:21
• Updated: 02/Aug/16 10:34

Description

This is not a big issue, but might be confusing for new users if they do not have the hostname set in their servers.

Steps taken to reproduce the issue:
1) Downloaded solr tar file to /opt folder.
2)Extract install_solr_service.sh file

tar xzf solr-5.1.0.tgz solr-5.1.0/bin/install_solr_service.sh --strip-components=2

3) run install_solr_service.sh file.

sudo bash ./install_solr_service.sh solr-5.1.0.tgz

The above step starts solr with default options.
4) Stop solr -

service solr stop

5) Change the JMX options in include folder at /var/solr/solr.in.sh

ENABLE_REMOTE_JMX_OPTS="true"

6) Start solr again

service solr start

if the host name is not specified in /etc/hosts file, following message is displayed

tail: cannot open `/var/solr/logs/solr' for reading: No such file or directory
tail: no files remaining

solr-8983-console.log file in /var/solr/logs shows the following output

Error: Exception thrown by the agent : java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: SERVERNAME: SERVERNAME: unknown error

The error occurs if the /etc/hosts file does not have an entry for SERVERNAME.

Setting SOLR_HOST=SERVERNAME in solr.in.sh also does not help.

Suggestion:
May be add a message info message when ENABLE_REMOTE_JMX_OPTS=true.