# Logstash fails to start: "no such file to load -- concurrent" **URL:** \ **Category:** Logstash\ **Created:** [November 2, 2021, 9:38pm UTC](https://discuss.elastic.co/t/logstash-fails-to-start-no-such-file-to-load-concurrent/288268 "2021-11-02T21:38:30Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![dwasss](https://avatars.discourse-cdn.com/v4/letter/d/77aa72/32.png) [@dwasss](https://discuss.elastic.co/u/dwasss)\ **Post date:** [November 2, 2021, 9:38pm UTC](https://discuss.elastic.co/t/logstash-fails-to-start-no-such-file-to-load-concurrent/288268/1 "2021-11-02T21:38:30Z")
I recently upgraded my Elastic stack from 7.12 to 7.15.1 on Ubuntu 18.04. Logstash is running via systemd. Now Logstash fails to start with the following error: ```auto Nov 02 19:58:28 server logstash[30340]: Using bundled JDK: /usr/share/logstash/jdk Nov 02 19:58:36 server logstash[30340]: [FATAL] 2021-11-02 19:58:36.526 [main] Logstash - Logstash stopped processing because of an error: (LoadError) no such file to load -- concurrent Nov 02 19:58:36 server logstash[30340]: org.jruby.exceptions.LoadError: (LoadError) no such file to load -- concurrent Nov 02 19:58:36 server logstash[30340]: at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:974) ~[jruby-complete-9.2.19.0.jar:?] Nov 02 19:58:36 server logstash[30340]: at RUBY.
(/usr/share/logstash/logstash-core/lib/logstash/config/defaults.rb:18) ~[?:?] Nov 02 19:58:36 server logstash[30340]: at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:974) ~[jruby-complete-9.2.19.0.jar:?] Nov 02 19:58:36 server logstash[30340]: at RUBY.
(/usr/share/logstash/logstash-core/lib/logstash/config/cpu_core_strategy.rb:18) ~[?:?] Nov 02 19:58:36 server logstash[30340]: at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:974) ~[jruby-complete-9.2.19.0.jar:?] Nov 02 19:58:36 server logstash[30340]: at RUBY.
(/usr/share/logstash/logstash-core/lib/logstash/environment.rb:19) ~[?:?] Nov 02 19:58:36 server logstash[30340]: at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:974) ~[jruby-complete-9.2.19.0.jar:?] Nov 02 19:58:36 server logstash[30340]: at RUBY.
(/usr/share/logstash/logstash-core/lib/logstash/runner.rb:38) ~[?:?] Nov 02 19:58:36 server logstash[30340]: at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:974) ~[jruby-complete-9.2.19.0.jar:?] Nov 02 19:58:36 server logstash[30340]: at usr.share.logstash.lib.bootstrap.environment.
(/usr/share/logstash/lib/bootstrap/environment.rb:92) ~[?:?] ``` It seems like there is a problem with jruby and some missing file? Can anyone help? I did try the config test and exit option and that seemed to work just fine. ---
**Author:** ![Rios](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rios/32/95745_2.png) [@Rios](https://discuss.elastic.co/u/Rios)\ **Post date:** [November 2, 2021, 9:44pm UTC](https://discuss.elastic.co/t/logstash-fails-to-start-no-such-file-to-load-concurrent/288268/2 "2021-11-02T21:44:29Z")
It seems your .conf file is missing. Do you have good extension .conf? ---
**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\ **Post date:** [November 2, 2021, 10:26pm UTC](https://discuss.elastic.co/t/logstash-fails-to-start-no-such-file-to-load-concurrent/288268/3 "2021-11-02T22:26:19Z")
> [@dwasss](#): > > It seems like there is a problem with jruby and some missing file? Can anyone help? I cannot help, just thought I would mention that it is trying to load a specific version of the concurrent gem, and it is not finding the version of that gem that it expects. I really don't know how to dig any deeper into that. ---
**Author:** ![dwasss](https://avatars.discourse-cdn.com/v4/letter/d/77aa72/32.png) [@dwasss](https://discuss.elastic.co/u/dwasss)\ **Post date:** [November 2, 2021, 10:35pm UTC](https://discuss.elastic.co/t/logstash-fails-to-start-no-such-file-to-load-concurrent/288268/4 "2021-11-02T22:35:18Z")
Which .conf file? I have several in /etc/logstash/conf.d/ that should be fine. ---
**Author:** ![dwasss](https://avatars.discourse-cdn.com/v4/letter/d/77aa72/32.png) [@dwasss](https://discuss.elastic.co/u/dwasss)\ **Post date:** [November 2, 2021, 10:37pm UTC](https://discuss.elastic.co/t/logstash-fails-to-start-no-such-file-to-load-concurrent/288268/5 "2021-11-02T22:37:06Z")
Is that something I can manually install or load? How can I see what gems are already installed? ---
**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\ **Post date:** [November 2, 2021, 10:45pm UTC](https://discuss.elastic.co/t/logstash-fails-to-start-no-such-file-to-load-concurrent/288268/6 "2021-11-02T22:45:04Z")
logstash should come bundled with all the gems it depends on. On my system I see ```auto drwxr-xr-x 4 root root 28 Mar 4 2020 /usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/concurrent-ruby-1.1.5 drwxr-xr-x 4 root root 28 Sep 3 2020 /usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/concurrent-ruby-1.1.6 drwxr-xr-x 4 root root 28 Mar 10 2021 /usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/concurrent-ruby-1.1.7 drwxr-xr-x 4 root root 28 Jun 14 20:17 /usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/concurrent-ruby-1.1.8 drwxr-xr-x 4 root root 115 Oct 15 13:45 /usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/concurrent-ruby-1.1.9 ``` Have you installed any additional plugins that could be adding dependencies? ---
**Author:** ![Rios](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rios/32/95745_2.png) [@Rios](https://discuss.elastic.co/u/Rios)\ **Post date:** [November 3, 2021, 7:52am UTC](https://discuss.elastic.co/t/logstash-fails-to-start-no-such-file-to-load-concurrent/288268/7 "2021-11-03T07:52:50Z")
[dwasss], have you try to test a single conf file from command line: /usr/share/logstash/bin/logstash -f /etc/logstash/conf.d/test.conf --path.settings /etc/logstash/ -t Then without "-t" Have you enable debug mode? - config.debug: true - log.level: debug ---
**Author:** ![dwasss](https://avatars.discourse-cdn.com/v4/letter/d/77aa72/32.png) [@dwasss](https://discuss.elastic.co/u/dwasss)\ **Post date:** [November 3, 2021, 5:16pm UTC](https://discuss.elastic.co/t/logstash-fails-to-start-no-such-file-to-load-concurrent/288268/8 "2021-11-03T17:16:24Z")
> [@Badger](#): > > `/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/` I don't think I added any more plugins. I see that I do have the latest concurrent version there: ```auto drwxr-xr-x 4 root root 4.0K Nov 2 19:19 concurrent-ruby-1.1.9 ``` ---
**Author:** ![dwasss](https://avatars.discourse-cdn.com/v4/letter/d/77aa72/32.png) [@dwasss](https://discuss.elastic.co/u/dwasss)\ **Post date:** [November 3, 2021, 5:46pm UTC](https://discuss.elastic.co/t/logstash-fails-to-start-no-such-file-to-load-concurrent/288268/9 "2021-11-03T17:46:44Z")
I tried enabling debug logging but logstash wouldn't even start so there wasn't really a point. I did just try from the command line with the "-t" switch and got an error. I then tried running with "sudo" and it validated and exited OK. So I guess it's a permissions issue? ```auto Using bundled JDK: /usr/share/logstash/jdk /usr/share/logstash/logstash-core-plugin-api/lib/logstash-core-plugin-api/version.rb:22: warning: The Psych YAML extension failed to load. Check your env for conflicting versions of SnakeYAML See https://github.com/jruby/jruby/wiki/FAQs#why-does-the-psych-yaml-extension-fail-to-load-in-my-environment [FATAL] 2021-11-03 17:40:50.633 [main] Logstash - Logstash stopped processing because of an error: (GemspecError) [!] There was an error while loading `logstash-core-plugin-api.gemspec`: load error: psych -- java.lang.RuntimeException: BUG: we can not copy embedded jar to temp directory. Bundler cannot continue. # from /usr/share/logstash/logstash-core-plugin-api/logstash-core-plugin-api.gemspec:23 # ------------------------------------------- # > require "logstash-core-plugin-api/version" # # ------------------------------------------- org.jruby.exceptions.StandardError: (GemspecError) [!] There was an error while loading `logstash-core-plugin-api.gemspec`: load error: psych -- java.lang.RuntimeException: BUG: we can not copy embedded jar to temp directory. Bundler cannot continue. ... ``` ---
**Author:** ![dwasss](https://avatars.discourse-cdn.com/v4/letter/d/77aa72/32.png) [@dwasss](https://discuss.elastic.co/u/dwasss)\ **Post date:** [November 3, 2021, 7:47pm UTC](https://discuss.elastic.co/t/logstash-fails-to-start-no-such-file-to-load-concurrent/288268/10 "2021-11-03T19:47:06Z")
There were a lot of permissions issues I kept running into with various files, such as in the jruby plugins, java tmp folder, logstash logs folder, etc. that kept causing errors. Furthermore, the /usr/share/logstash/ directory and subfolders were all owned by root, thus there were more permissions issues. I just changed ownership to the logstash user and then things started working again. I think I'm good now. Thanks @Rios and @Badger for your troubleshooting help. I'm not sure why upgrading from 7.12 to 7.15.1 jacked up the file and folder permissions 😖 ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [December 1, 2021, 7:47pm UTC](https://discuss.elastic.co/t/logstash-fails-to-start-no-such-file-to-load-concurrent/288268/11 "2021-12-01T19:47:46Z")
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