bluechi-is-online¶
The BlueChi project offers with bluechi-is-online a CLI tool for checking and monitoring the connection state of BlueChi components in the system. It can be wrapped in systemd units so that other units can be started or stopped based on the connection state.
Note
For more information please refer to the man page of bluechi-is-online.
Install bluechi-is-online on CentOS¶
sudo dnf install bluechi-is-online
Verify Installation¶
You can verify that the CLI tool has been installed by:
$ bluechi-is-online help
bluechi-is-online checks and monitors the connection state of BlueChi components
...
Usage example¶
$ cat /etc/systemd/system/monitor-bluechi-agent.service
[Unit]
Description=Monitor bluechi-agents connection to controller
[Service]
Type=simple
ExecStart=/usr/local/bin/bluechi-is-online agent --wait=2000 --switch-timeout=2000 --monitor
$ cat /etc/systemd/system/workload.service
[Unit]
Description=Some workload that should stop running when bluechi-agent disconnects
BindsTo=monitor-bluechi-agent.service
After=monitor-bluechi-agent.service
[Service]
...
$ cat /etc/systemd/system/handle-bluechi-agent-offline.service
[Unit]
Description=Handle BlueChi Agent going offline and start take-action.service
OnFailure=take-action.service
[Service]
Type=simple
ExecStart=/usr/local/bin/bluechi-is-online agent --wait=2000 --switch-timeout=2000 --monitor