cg_diff - Linux
Overview
cg_diff is a powerful command-line tool for comparing two control groups (cgroups) and highlighting their differences. It provides a detailed view of the configuration parameters, hierarchies, and resource limits set for each cgroup, enabling users to quickly identify and analyze variations between them.
Syntax
cg_diff [OPTIONS] CGROUP1 CGROUP2
Options/Flags
- -a, –all: Compare all parameters, including inherited values.
- -e, –exclude-inherited: Exclude inherited values from comparison.
- -h, –help: Display brief help information.
- -i, –ignore-case: Ignore case differences in parameter values.
- -n, –numeric: Output numeric values for parameters.
- -q, –quiet: Suppress output of identical parameters.
- -s, –skip-keys: Skip comparison of specified parameter keys.
- -t, –tree: Display differences in a tree-like format.
- -v, –verbose: Display more verbose output.
Examples
Simple Comparison:
cg_diff /sys/fs/cgroup/cpuset/user1 /sys/fs/cgroup/cpuset/user2
Verbose Comparison (with Tree Format):
cg_diff -tv /sys/fs/cgroup/memory/group1 /sys/fs/cgroup/memory/group2
Ignore Inherited Values:
cg_diff -ea /sys/fs/cgroup/memory/user1 /sys/fs/cgroup/memory/user2
Common Issues
- Incorrect Cgroup Paths: Ensure that the provided cgroup paths are valid.
- Permission Denied: Verify that you have sufficient permissions to access the cgroup filesystems.
- Parameter Not Found: Check that the specified parameter key exists in the cgroups being compared.
Integration
Combine with ‘cgget’ for Advanced Analysis:
cgget -a /sys/fs/cgroup/memory/group1 | cg_diff -
Create Ansible Playbooks for Cgroup Management:
- name: Compare cgroups
cg_diff:
target: /sys/fs/cgroup/memory/
group1: group1
group2: group2
Related Commands
- cgcreate
- cgdelete
- cgset
- cgget