Snap developers can use this tool to help them debug and fix policy violations.
Each snap runs confined inside its own sandbox. The policy of each sandbox describes what the application is allowed to do. When an application tries to do something that is not allowed, the system logs a policy violation.
This snap
Run the following command to start watching policy violations.
sudo snappy-debug
If you have dropped messages, try the following command instead.
sudo journalctl --output=short --follow --all | sudo snappy-debug
Note: these commands only show policy violations that happen after you run them. So first run one of these commands and then run the snap that you want to debug.
See snappy-debug --help for more information about this tool.
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Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.
Snap is available for CentOS 7.6+, and Red Hat Enterprise Linux 7.6+, from the Extra Packages for Enterprise Linux (EPEL) repository. The EPEL repository can be added to your system with the following command:
sudo yum install epel-release
Snap can now be installed as follows:
sudo yum install snapd
Once installed, the systemd unit that manages the main snap communication socket needs to be enabled:
sudo systemctl enable --now snapd.socket
To enable classic snap support, enter the following to create a symbolic link between /var/lib/snapd/snap and /snap:
sudo ln -s /var/lib/snapd/snap /snap
Either log out and back in again, or restart your system, to ensure snap’s paths are updated correctly.
To install snappy-debug, simply use the following command:
sudo snap install snappy-debug
Browse and find snaps from the convenience of your desktop using the snap store snap.
Interested to find out more about snaps? Want to publish your own application? Visit snapcraft.io now.