On 1/9/19 9:00 AM, Simon Matter via CentOS wrote:
Maybe things_could_ be done the right way with systemd, but it doesn't happen because it quickly starts to be very complex and it's a lot of work to do it for a complete distribution.
If you've looked at the sysv init script for postgresql, you know that that statement describes both init systems.
Systems engineering is hard. It's fashionable to blame systemd, but it's not systemd's fault that there's a delay between the point at which postgresql forks and the point at which it's available for use. SysV didn't magically solve that problem. Someone had to specifically write a delay loop in the init script to make the system work reliably, beforehand. PostgreSQL isn't alone in that. Other services needed their own hacks. And collectively, "Maybe things _could_ be done the right way with SysV, but it doesn't happen because it quickly starts to be very complex and it's a lot of work to do it for a complete distribution."
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