undefined method `have_capability?' for nil" #5152
Description
Discussed in #5151
Originally posted by krish0596 November 13, 2025
What is a problem?
I am getting this error
2025-11-13 09:34:22 +0000 [error]: fluent/log.rb:414:error: unexpected error error_class=NoMethodError error="undefined method have_capability?' for nil"`
when trying to load a containerized fluentd image with added capablities through daemon set, not able to resolve this issue
Environment
- Linux / macOS
- Fluentd 1.19.0 / 1.19.1
How to reproduce
- configuration
<source>
@type tail
tag test
# 1. Use file glob (*) to reproduce the error.
# 2. Specify the path owned by other user.
path /var/log/*.log
<parse>
@type none
</parse>
</source>
<match **>
@type stdout
</match>
- result
$ ruby bin/fluentd -c ~/prj/sandbox/fluentd/capability.conf
2025-11-21 14:05:32 +0900 [info]: init supervisor logger path=nil rotate_age=nil rotate_size=nil
2025-11-21 14:05:32 +0900 [info]: parsing config file is succeeded path="/home/watson/prj/sandbox/fluentd/capability.conf"
2025-11-21 14:05:32 +0900 [info]: inaccessible include directory was specified path="/etc/fluent/conf.d"
2025-11-21 14:05:32 +0900 [info]: gem 'fluent-plugin-parser-winevt_xml' version '0.2.8'
2025-11-21 14:05:32 +0900 [info]: gem 'fluent-plugin-splunk-enterprise' version '0.10.2'
2025-11-21 14:05:32 +0900 [info]: gem 'fluent-plugin-splunk-hec' version '1.3.3'
2025-11-21 14:05:32 +0900 [info]: gem 'fluentd' version '1.19.1'
2025-11-21 14:05:32 +0900 [error]: unexpected error error_class=NoMethodError error="undefined method 'have_capability?' for nil"
My machine has following files in /var/log
$ ls -l /var/log/*.log
-rw-r--r-- 1 root root 43997 11月 21 10:52 /var/log/Xorg.0.log
-rw-r--r-- 1 root root 47791 1月 22 2025 /var/log/Xorg.1.log
-rw-r--r-- 1 root root 49470 11月 17 18:39 /var/log/Xorg.2.log
-rw------- 1 root root 14867 11月 21 10:52 /var/log/boot.log
-rw-r--r-- 1 root root 886824 11月 21 10:32 /var/log/pacman.log
When permissions are set in a way that makes them inaccessible to other users, such as /var/log/boot.log, then, specifying to read a file using glob, it causes an error.