Systemd vs. Docker
Systemd vs. Docker
Posted Feb 28, 2016 6:44 UTC (Sun) by Cyberax (✭ supporter ✭, #52523)In reply to: Systemd vs. Docker by mchapman
Parent article: Systemd vs. Docker
Yes, you need to SIGSTOP everything first. Though it can be susceptible to a livelock (if a group of processes SIGCONT every other process). Freezer would solve this, but it's not available everywhere.
It appears that process handles or PID namespaces is the only reliable way.