Clear PostgreSQL logs in AWS Ubuntu Server

All we need is an easy explanation of the problem, so here it is.

I am trying to clear the logs of an postgresql under /var/log/postgresql/ but I am getting error message as below:

 /var/log/postgresql$ sudo > postgresql-11-main.log
 -bash: postgresql-11-main.log: Permission denied

Below is folder files structure:

 /var/log/postgresql$ ls -la
 total 1097296
 drwxrwxr-t  2 root     postgres       4096 Apr 25 06:56 .
 drwxrwxr-x 12 root     syslog         4096 Apr 28 06:35 ..
 -rw-r-----  1 postgres adm      1107919237 Apr 29 06:33 postgresql-11-main.log
 -rw-r-----  1 postgres adm        14480619 Apr 25 06:56 postgresql-11-main.log.1
 -rw-r-----  1 postgres adm         1199751 Apr 18 06:49 postgresql-11-main.log.2.gz

Also, is it okay to clear the logs of an PostgreSQL? will it harm any existing database or work flow?

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

That is a bash problem. The redirection (>) is not part of the command executed as root, but as your current user.

Use this workaround:

sudo sh -c "> /var/log/postgresql/postgresql-11-main.log"

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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