Nginx如何对变量进行debug

add_header X-debug $suffix;
[......]

Create a Multi-Cluster Monitoring Dashboard with Thanos, Grafana and Prometheus

开源dashboard

https://grafana.com/grafana/dashboards

https://github.com/percona/grafana-dashboards/[......]

delete from YOUR_TABLE where id not in (select id from (select max(id) as id from YOUR_TABLE group by UNIQUE_FIELD) as b);

[......]

timedatectl set-local-rtc 1 --adjust-system-clock

[......]

转载自：https://askubuntu.com/questions/18654/how-to-prevent-updating-of-a-specific-package

dpkg或者apt二选一即可

dpkg层面
# Put a package on hold:
echo "<package-name> hold" | sudo dpkg --set-selections

# Remove the hold:
echo "<package-name[......]