# Signals - Failed to start thread - pthread\_create failed (EAGAIN)

**URL:** <https://forum.search-guard.com/t/signals-failed-to-start-thread-pthread-create-failed-eagain/1898>\
**Category:** Signals Alerting\
**Created:** [July 13, 2020, 2:35pm UTC](https://forum.search-guard.com/t/signals-failed-to-start-thread-pthread-create-failed-eagain/1898 "2020-07-13T14:35:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![marwojt](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.search-guard.com/marwojt/32/872_2.png) [@marwojt](https://forum.search-guard.com/u/marwojt)\
**Post date:** [July 13, 2020, 2:35pm UTC](https://forum.search-guard.com/t/signals-failed-to-start-thread-pthread-create-failed-eagain/1898/1 "2020-07-13T14:35:08Z")

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**Elasticsearch version:**  
7.8  
**Server OS version:**  
Centos 7  
**Kibana version (if relevant):**  
7.8  
**Browser version (if relevant):**

**Browser OS version (if relevant):**

**Describe the issue:**  
I have problem to start more instances of elasticsearch containers on the same machine. When i disable signals in elasticsearch.yml i can run more containers.  
Could You provide me some info what can be a reason?

Log from instance

Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: [12.360s][warning][os,thread] Failed to start thread - pthread\_create failed (EAGAIN) for attributes: stacksize: 1024k, guardsize: 0k, deta  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: fatal error in thread [Thread-5], exiting  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: java.lang.OutOfMemoryError: unable to create native thread: possibly out of memory or process/resource limits reached  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: at java.base/java.lang.Thread.start0(Native Method)  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: at java.base/java.lang.Thread.start(Thread.java:801)  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: at org.quartz.simpl.SimpleThreadPool.initialize(SimpleThreadPool.java:277)  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: at com.floragunn.searchsupport.jobs.SchedulerBuilder.buildImpl(SchedulerBuilder.java:239)  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: at com.floragunn.searchsupport.jobs.SchedulerBuilder.build(SchedulerBuilder.java:232)  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: at com.floragunn.signals.SignalsTenant.init(SignalsTenant.java:138)  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: at com.floragunn.signals.SignalsTenant.create(SignalsTenant.java:78)  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: at com.floragunn.signals.Signals.createTenant(Signals.java:255)  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: at com.floragunn.signals.Signals.updateTenants(Signals.java:363)  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: at com.floragunn.signals.Signals.access$300(Signals.java:56)  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: at com.floragunn.signals.Signals$2.onChanged(Signals.java:453)  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: at com.floragunn.searchguard.sgconf.DynamicConfigFactory.onChange(DynamicConfigFactory.java:177)  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: at com.floragunn.searchguard.configuration.ConfigurationRepository.notifyAboutChanges(ConfigurationRepository.java:337)  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: at com.floragunn.searchguard.configuration.ConfigurationRepository.reloadConfiguration0(ConfigurationRepository.java:291)  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: at com.floragunn.searchguard.configuration.ConfigurationRepository.reloadConfiguration(ConfigurationRepository.java:274)  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: at com.floragunn.searchguard.configuration.ConfigurationRepository$1.run(ConfigurationRepository.java:191)  
Jul 13 16:05:08 esdata2 systemd-entrypoint[2441]: at java.base/java.lang.Thread.run(Thread.java:832)

best regards

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<div class="post-metadata">

**Author:** ![srgbnd](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.search-guard.com/srgbnd/32/506_2.png) [@srgbnd](https://forum.search-guard.com/u/srgbnd)\
**Post date:** [July 14, 2020, 5:47pm UTC](https://forum.search-guard.com/t/signals-failed-to-start-thread-pthread-create-failed-eagain/1898/2 "2020-07-14T17:47:35Z")

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> java.lang.OutOfMemoryError: unable to create native thread: possibly out of memory or process/resource limits reached

Increase the Java memory: [Elasticsearch OutOfMemoryError Java heap space - Stack Overflow](https://stackoverflow.com/q/27359885/2393924)