# Logstash Alter filter not found
**URL:** https://discuss.elastic.co/t/logstash-alter-filter-not-found/125278
**Category:** Logstash
**Created:** [March 22, 2018, 10:46pm UTC](https://discuss.elastic.co/t/logstash-alter-filter-not-found/125278 "2018-03-22T22:46:18Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@motts](https://discuss.elastic.co/u/motts)
#### Post date: [March 22, 2018, 10:46pm UTC](https://discuss.elastic.co/t/logstash-alter-filter-not-found/125278/1 "2018-03-22T22:46:18Z")
Hello,
I am on CentOS 6.9 and running LS 6.x. I have the Alter filter plugin installed, but when running LS, there is an error and LS will not start:
> [2018-03-22T18:41:50,722][ERROR][logstash.agent] Failed to execute action {:action=\>LogStash::PipelineAction::Create/pipeline\_id:main, :exception=\>"LogStash::PluginLoadingError", :message=\>"Couldn't find any filter plugin named 'alter'. Are you sure this is correct? Trying to load the alter filter plugin resulted in this error: no such file to load -- logstash/filters/alter", :backtrace=\>["/usr/share/logstash/logstash-core/lib/logstash/plugins/registry.rb:192:in `lookup_pipeline_plugin'", "/usr/share/logstash/logstash-core/lib/logstash/plugin.rb:140:in `lookup'", "/usr/share/logstash/logstash-core/lib/logstash/plugins/plugin\_factory.rb:81:in `plugin'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:112:in `plugin'", "(eval):227:in `'", "org/jruby/RubyKernel.java:994:in `eval'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:84:in `initialize'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:169:in `initialize'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline\_action/create.rb:40:in `execute'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:315:in `block in converge\_state'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:141:in `with_pipelines'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:312:in `block in converge\_state'", "org/jruby/RubyArray.java:1734:in `each'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:299:in `converge\_state'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:166:in `block in converge_state_and_update'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:141:in `with\_pipelines'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:164:in `converge_state_and_update'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:458:in `block in trap\_sighup'", "org/jruby/RubyArray.java:1734:in `each'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/stud-0.0.23/lib/stud/trap.rb:46:in `simulate\_signal'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/stud-0.0.23/lib/stud/trap.rb:26:in `block in trap'"]}
but the filer is installed. I can even remove it successfully:
```
[root@elk-logstash-lab02 logstash]# ./bin/logstash-plugin remove logstash-filter-alter
Successfully removed logstash-filter-alter
```
I tried to reinstall it, but I keep getting the same error.
Thanks for your time.
---
### Author:  [@motts](https://discuss.elastic.co/u/motts)
#### Post date: [March 23, 2018, 1:09pm UTC](https://discuss.elastic.co/t/logstash-alter-filter-not-found/125278/2 "2018-03-23T13:09:07Z")
Here is the filter also
```
/opt/logstash/vendor/bundle/jruby/1.9/cache/logstash-filter-alter-3.0.3.gem
/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-alter-3.0.3
/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-alter-3.0.3/CHANGELOG.md
/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-alter-3.0.3/CONTRIBUTORS
/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-alter-3.0.3/Gemfile
/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-alter-3.0.3/LICENSE
/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-alter-3.0.3/NOTICE.TXT
/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-alter-3.0.3/README.md
/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-alter-3.0.3/docs
/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-alter-3.0.3/lib
/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-alter-3.0.3/logstash-filter-alter.gemspec
/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-alter-3.0.3/spec
/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-alter-3.0.3/docs/index.asciidoc
/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-alter-3.0.3/lib/logstash
/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-alter-3.0.3/lib/logstash/filters
/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-alter-3.0.3/lib/logstash/filters/alter.rb
/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-alter-3.0.3/spec/filters
/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-alter-3.0.3/spec/spec_helper.rb
/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-alter-3.0.3/spec/filters/alter_spec.rb
/opt/logstash/vendor/bundle/jruby/1.9/specifications/logstash-filter-alter-3.0.3.gemspec
/root/.gem/specs/api.rubygems.org%443/quick/Marshal.4.8/logstash-filter-alter-3.0.3.gemspec
/usr/share/logstash/vendor/bundle/jruby/2.3.0/cache/logstash-filter-alter-3.0.3.gem
/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-alter-3.0.3
/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-alter-3.0.3/CHANGELOG.md
/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-alter-3.0.3/CONTRIBUTORS
/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-alter-3.0.3/Gemfile
/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-alter-3.0.3/LICENSE
/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-alter-3.0.3/NOTICE.TXT
/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-alter-3.0.3/README.md
/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-alter-3.0.3/docs
/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-alter-3.0.3/lib
/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-alter-3.0.3/logstash-filter-alter.gemspec
/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-alter-3.0.3/spec
/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-alter-3.0.3/docs/index.asciidoc
/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-alter-3.0.3/lib/logstash
/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-alter-3.0.3/lib/logstash/filters
/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-alter-3.0.3/lib/logstash/filters/alter.rb
/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-alter-3.0.3/spec/filters
/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-alter-3.0.3/spec/spec_helper.rb
/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-alter-3.0.3/spec/filters/alter_spec.rb
/usr/share/logstash/vendor/bundle/jruby/2.3.0/specifications/logstash-filter-alter-3.0.3.gemspec
```
and here
```
[root@elk-logstash-lab02 logstash]# ./bin/logstash-plugin list --group filter
logstash-filter-aggregate
logstash-filter-alter
logstash-filter-anonymize
logstash-filter-cidr
```
---
### Author:  [@motts](https://discuss.elastic.co/u/motts)
#### Post date: [March 30, 2018, 7:50pm UTC](https://discuss.elastic.co/t/logstash-alter-filter-not-found/125278/3 "2018-03-30T19:50:48Z")
Has anyone looked into this?
---
### Author:  [@motts](https://discuss.elastic.co/u/motts)
#### Post date: [April 10, 2018, 3:16pm UTC](https://discuss.elastic.co/t/logstash-alter-filter-not-found/125278/4 "2018-04-10T15:16:08Z")
Update: any installation of of filters causes logstash to not function. Maybe I am doing something wrong, but here is what I do:
cd /usr/share/logstash
./bin/logstash-plugin install logstash-filter-cipher
To my knowledge, this is the correct way to install filters, but no installation of filters works. Pleas advise.
Thanks
---
### Author:  [@motts](https://discuss.elastic.co/u/motts)
#### Post date: [April 16, 2018, 1:50pm UTC](https://discuss.elastic.co/t/logstash-alter-filter-not-found/125278/5 "2018-04-16T13:50:09Z")
Does anyone need any more information? This post has been up about a month now. I cannot roll out 6.2 into production with this hangup here.
---
### Author:  [@motts](https://discuss.elastic.co/u/motts)
#### Post date: [April 19, 2018, 2:19pm UTC](https://discuss.elastic.co/t/logstash-alter-filter-not-found/125278/6 "2018-04-19T14:19:45Z")
This thread has been open almost a month now. Has anyone looked into this?
---
### Author:  [@motts](https://discuss.elastic.co/u/motts)
#### Post date: [May 15, 2018, 5:59pm UTC](https://discuss.elastic.co/t/logstash-alter-filter-not-found/125278/7 "2018-05-15T17:59:20Z")
Anyone have any suggestions?
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [June 12, 2018, 5:59pm UTC](https://discuss.elastic.co/t/logstash-alter-filter-not-found/125278/8 "2018-06-12T17:59:23Z")
This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.