How to remove Elasticsearch from Ubuntu?

Question

I think that I already removed elasticsearch from my computer, and still I have some doubts.

When I type:

$ service elasticsearch status

I get:

elasticsearch.service Loaded: not-found (Reason: No such file or directory) Active: failed (Result: exit-code) since Wed 2017-08-09 01:08:18 PDT; 38min ago Main PID: 73249 (code=exited, status=1/FAILURE)

Aug 09 01:08:18 ubuntu elasticsearch[73249]: Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000085330000, 2060255232, 0) fai Aug 09 01:08:18 ubuntu elasticsearch[73249]: # Aug 09 01:08:18 ubuntu elasticsearch[73249]: # There is insufficient memory for the Java Runtime Environment to continue. Aug 09 01:08:18 ubuntu elasticsearch[73249]: # Native memory allocation (mmap) failed to map 2060255232 bytes for committing reserved memory. Aug 09 01:08:18 ubuntu elasticsearch[73249]: # An error report file with more information is saved as: Aug 09 01:08:18 ubuntu elasticsearch[73249]:

/tmp/hs_err_pid73249.log Aug 09 01:08:18 ubuntu systemd[1]: elasticsearch.service: Main process exited, code=exited,

status=1/FAILURE Aug 09 01:08:18 ubuntu systemd[1]: elasticsearch.service: Unit entered failed state. Aug 09 01:08:18 ubuntu systemd[1]: elasticsearch.service: Failed with result 'exit-code'. Aug 09 01:12:38 ubuntu systemd[1]: Stopped Elasticsearch.

However, when I type:

$ service helloworld status 

I get somehting much shorter:

helloworld.service Loaded: not-found (Reason: No such file or

directory) Active: inactive (dead)

I already removed Elasticsearch by using the command:

sudo apt-get --purge autoremove elasticsearch

and it still looks like elasticsearch exists.

Answer 1

On ubuntu 20.04, I had a similar problem: I wanted to totally remove elasticsearch 7.15.1 and install the previous version 7.10.1.

I ran:

sudo apt-get remove --purge elasticsearch

The message was:

dpkg: warning: while removing elasticsearch, directory '/var/lib/elasticsearch' not empty so not removed
dpkg: warning: while removing elasticsearch, directory '/etc/elasticsearch' not empty so not removed

So I removed those directories:

sudo rm -rf /etc/elasticsearch
sudo rm -rf /var/lib/elasticsearch

And I was able to downgrade without any errors:

sudo apt-get install elasticsearch=7.10.1
sudo systemctl start elasticsearch
curl http://localhost:9200/

Answer 2

for uninstall deb package you can use:

dpkg --purge elasticsearch

or

apt-get --purge autoremove elasticsearch

you can find all elasticsearch related folders with locate elasticsearch but before that use updatedb command.

# updatedb

# locate elasticsearch

I will list all default elasticsearch path for more information.

configurations files:

/etc/elasticsearch/
/etc/default/elasticsearch

base path(bins and libs and ...):

/usr/share/elasticsearch/

data path (can be configured in /etc/elasticsearch/elasticsearch.yml):

/var/lib/elasticsearch

log path (can be configured in /etc/elasticsearch/elasticsearch.yml):

/var/log/elasticsearch/

service files:

/etc/init.d/elasticsearch
/etc/systemd/system/multi-user.target.wants/elasticsearch.service
/usr/lib/systemd/system/elasticsearch.service