How to confirm Solr is running from the command line?

Question

We have a few servers that are going to be rebooted soon and I may have to restart Apache Solr manually.

How can I verify (from the command line) that Solr is running?

Answer 1

The proper way is to use Solr's STATUS command. You could parse its XML response, but as long as it returns something to you with an HTTP status of 200 , it should be safe to assume it's running. You can perform an HTTP HEAD request using curl with:

curl -s -o /dev/null -I -w '%{http_code}' http://example.com:8983/solr/admin/cores?action=STATUS

• NOTE: Also, you can add a -m <seconds> to the command to only wait so many seconds for a response.

This will make a request to the Solr admin interface, and print out 200 on success which can be used from a bash script such as:

RESULT=$(curl -s -o /dev/null -I -w '%{http_code}' http://example.com:8983/solr/admin/cores?action=STATUS)
if [ "$RESULT" -eq '200' ]; then
    # Solr is running...
else
    # Solr is not running...
fi

Answer 2

如果您在运行 Solr 的同一台机器上，那么这是我的最爱：

$> solr status