为什么elasticsearch不能在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

Elasticsearch服务初始化脚本在启动失败时不会在控制台或日志文件上打印任何错误信息,而是可笑地显示[OK].

您必须使用与init脚本执行的相同用户和相同参数手动运行elaticsearch以检查出现了什么问题.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,没有更改任何路径,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

我刚刚添加了一行/etc/init.d/elasticsearch来打印出上面的命令:

# 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 $?

Answer 2

elasticsearch用户无法写入PID文件,因为它无权在/ var/run /中创建文件:

FileNotFoundException[/var/run/elasticsearch.pid (Keine Berechtigung)]

修复:创建目录/ var/run/elasticsearch /,将其所有权更改为elasticsearch:elasticsearch,并在init脚本中将PID文件位置更改为此目录.

mkdir -p /var/run/elasticsearch
chown elasticsearch: /var/run/elasticsearch
sed -e 's|^PID_FILE=.*$|PID_FILE=/var/run/$NAME/$NAME.pid|g' -i /etc/init.d/elasticsearch

一旦你走得那么远,这是你可能会看到的下一个错误:

ElasticsearchIllegalStateException[Failed to obtain node lock, is the following location writable?: [/var/lib/elasticsearch/elasticsearch]]

资源再次没有为elasticsearch用户提供正确的权限.

chown -R elasticsearch: /var/lib/elasticsearch

还没做完.现在你必须编辑/etc/init.d/elasticsearch并删除这一行:

test "$START_DAEMON" == true || exit 0

这条线是完全垃圾,保证会退出.

现在它应该终于开始了.

Answer 3

如果您使用的是Elasticsearch 5.0.

现在,Elasticsearch 5.0的最小/最大堆大小要求默认为2gb

检查ls /tmp/hs_err_pid*.log文件,在日志中,您将看到JVM由于内存不足而无法启动ES.

您可以在中调整堆大小设置/etc/elasticsearch/jvm.options.调整线路-Xms2g,并-Xmx2g以-Xms1g和-Xmx1g分别,如果你在使用2 GB RAM的盒子.如果您打算使用带有1 GB RAM的盒子,我建议使用-Xms512m和-Xmx512m.

参考

Answer 4

虽然接受的答案命令对我使用Elasticsearch 1.7.3有效,但在Elasticsearch> 2.0中进行一些更改运行接受的答案命令会产生

es.default.config is no longer supported. elasticsearch.yml 
must be placed in the config directory and cannot be renamed

Github问题

上面Github问题中指定的命令现在是:

sudo -u elasticsearch /usr/share/elasticsearch/bin/elasticsearch -d -p /var/run/elasticsearch.pid --path.conf=/etc/elasticsearch --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