ctdb service can't start

[JackyChenNgu]

ctdb: ctdb-4.7.1-9.el7_5.x86_64
os: CentOS Linux release 7.5.1804 (Core)
kernel : Linux nfs-ganesha-01 3.10.0-862.el7.x86_64 #1 SMP Fri Apr 20 16:44:24 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
node: three nodes

I have with the cephfs + ctdb + nfs-ganesha to appear to HA nfs cluster , but when i configure ctdbd.conf ,and disabled selinux , then i start ctdb service ,

but the ctdb service can't start
err logs:

2018/10/17 12:41:38.789592 ctdbd[53761]: Unable to set scheduler to SCHED_FIFO (Operation not permitted)
2018/10/17 22:15:25.018211 ctdbd[257441]: Starting CTDBD (Version 4.7.1) as PID: 257441
2018/10/17 22:15:25.018396 ctdbd[257441]: Unable to set scheduler to SCHED_FIFO (Operation not permitted)

and , i have try echo 10000 > /sys/fs/cgroup/cpu/system.slice/cpu.rt_runtime_us

then start ctdb , and appear the same problem.

i hope get the reason and solved method.

look forward to your reply .

thanks

[icebal]

fixed this by doing echo 95000 > /sys/fs/cgroup/cpu/system.slice/cpu.rt_runtime_us
then restarting ctdb.service. not sure what the long term fix would be.

[combrs]

please see this bug , it contains long-term solution and link to [systemd clarification] (https://www.freedesktop.org/wiki/Software/systemd/MyServiceCantGetRealtime/)

I think it need to be packed in rpm! I'm using storhaug-1.0-1.el7.noarch from ovirt

[icebal]

turns out this was (partly) a limits.conf issue. specifying * hard rtprio unlimited or 95000 worked for all users cept root. after specifying root hard rtprio 95000 when the service runs and "ExecStartPre=/bin/cat /sys/fs/cgroup/cpu/system.slice/cpu.rt_runtime_us" runs, it shows in the log as 95000, but still gets the "Unable to set scheduler to SCHED_FIFO (Operation not permitted)" issue