Fluentd gives the error: Log file is not writable, when starting the server

问题

Here's my td-agent.conf file

<source>
 @type http  
 port 8888
</source>

<match whatever.access>
 @type file
 path /var/log/what.txt
</match>

But when I try to start the server using

sudo /etc/init.d/td-agent start

it gives the following error:

'2016-02-01 10:45:49 +0530 [error]: fluent/supervisor.rb:359:rescue in >main_process: config error file="/etc/td-agent/td-agent.conf" error="out_file: >/var/log/what.txt.20160201_0.log is not writable"

Can someone explain what's wrong?

回答1:

If you installed td-agent v2, it creates its own user and group called td-agent. I believe that when you run the td-agent service, it switches to this user and hence it expects the directory to have write permissions for this user. I faced the same issue and did something like: (Use sudo if needed for below commands.)

mkdir /logs
chown td-agent:td-agent /logs

and update your section to:

<match whatever.access>
  @type file
  path /logs/what.txt
</match>

回答2:

I think when you try to start td-agent, you do not have permission to access /var/log/, using ls -l to check its permission mode and change it with chmod. I got the same problem, after change directory's access permission, td-agent can be started.

来源：https://stackoverflow.com/questions/35123483/fluentd-gives-the-error-log-file-is-not-writable-when-starting-the-server