为什么Elasticsearch无法在Ubuntu 14.04上运行？

Question

我正在尝试确定elasticsearch实例是否正在运行，但它似乎不是：

ubuntu@ubuntu:~$ sudo service elasticsearch status
 * elasticsearch is not running
ubuntu@ubuntu:~$ sudo service elasticsearch start
 * Starting Elasticsearch Server  [ OK ] 
ubuntu@ubuntu:~$ sudo service elasticsearch status
 * elasticsearch is not running
and

ubuntu@ubuntu:~$ sudo /etc/init.d/elasticsearch status
 * elasticsearch is not running
ubuntu@ubuntu:~$ sudo /etc/init.d/elasticsearch start
 * Starting Elasticsearch Server  [ OK ] 
ubuntu@ubuntu:~$ sudo /etc/init.d/elasticsearch status
 * elasticsearch is not running
ubuntu@ubuntu:/etc/elasticsearch# sudo service elasticsearch restart
 * Stopping Elasticsearch Server  [ OK ] 
 * Starting Elasticsearch Server  [ OK ] 
ubuntu@ubuntu:/etc/elasticsearch# sudo service elasticsearch status
 * elasticsearch is not running

和

ubuntu@ubuntu:~$ curl -XGET localhost:9200/_nodes/_all/process?pretty
curl: (7) Failed to connect to localhost port 9200: Connection refused

和

ubuntu@ubuntu:/etc/elasticsearch$ sudo netstat -nlp
tcp6       0      0 :::9300                 :::*                    LISTEN      4413/java

UPD

我的elasticsearch.log：

[2014-12-03 00:00:02,161][INFO ][cluster.metadata         ] [Zero] [logstash-2014.12.03] creating index, cause [auto(bulk api)], shards [5]/[1], mappings [_default_]
[2014-12-03 00:00:02,617][INFO ][cluster.metadata         ] [Zero] [logstash-2014.12.03] update_mapping [logs] (dynamic)
[2014-12-03 00:00:12,737][INFO ][cluster.metadata         ] [Zero] [logstash-2014.12.03] update_mapping [logs] (dynamic)
[2014-12-03 00:00:17,587][INFO ][cluster.metadata         ] [Zero] [logstash-2014.12.03] update_mapping [logs] (dynamic)
[2014-12-03 00:00:18,842][INFO ][cluster.metadata         ] [Zero] [logstash-2014.12.03] update_mapping [logs] (dynamic)
[2014-12-03 01:00:01,430][INFO ][cluster.metadata         ] [Zero] [logstash-2014.11.25] deleting index
[2014-12-03 09:46:57,461][INFO ][cluster.metadata         ] [Zero] [logstash-2014.12.03] update_mapping [logs] (dynamic)

Answer 1

当启动失败时，Elasticsearch服务初始化脚本不会在控制台或日志文件上显示任何错误信息，而是荒谬地显示[OK]。

您必须使用与初始化脚本相同的用户和参数来手动运行elaticsearch，以检查出了什么问题。错误消息将打印在控制台上。

在安装了elasticsearch-1.4.1.deb的Ubuntu 14.10上，未更改任何路径，运行elastisearch的命令是：

sudo -u elasticsearch /usr/share/elasticsearch/bin/elasticsearch -d -p /var/run/elasticsearch.pid --default.config=/etc/elasticsearch/elasticsearch.yml --default.path.home=/usr/share/elasticsearch --default.path.logs=/var/log/elasticsearch --default.path.data=/var/lib/elasticsearch --default.path.work=/tmp/elasticsearch --default.path.conf=/etc/elasticsearch

我只是添加了一行/etc/init.d/elasticsearch以打印出上面的命令：

# Start Daemon
log_daemon_msg "sudo -u $ES_USER $DAEMON $DAEMON_OPTS"    # <-- Add this line
start-stop-daemon --start -b --user "$ES_USER" -c "$ES_USER" --pidfile "$PID_FILE" --exec $DAEMON -- $DAEMON_OPTS
log_end_msg $?