Updating systemctl limits on Debian

1. Become root

2. vi /lib/systemd/system/ceph-osd@.service

Change the values of proc and files to the following (extracted from ulimit -a).

[Service]  
LimitNOFILE=78452  
LimitNPROC=80248

3. $ sudo systemctl daemon-reload

4. Restart OSDs

$ cat update-systemctl.sh  
for ip in $(cat ip.list)  
do  
scp ceph-osd@.service $ip:/tmp
ssh $ip sudo cp /tmp/ceph-osd@.service /lib/systemd/system/ceph-osd@.service  
ssh $ip sudo systemctl daemon-reload  
ssh $ip sudo sudo systemctl start ceph\*.service ceph\*.target  
done

$ cat ceph-osd@.service  
[Unit]  
Description=Ceph object storage daemon osd.%i  
After=network-online.target local-fs.target time-sync.target ceph-mon.target  
Wants=network-online.target local-fs.target time-sync.target  
PartOf=ceph-osd.target

[Service]  
LimitNOFILE=78452  
LimitNPROC=80248  
EnvironmentFile=-/etc/default/ceph  
Environment=CLUSTER=ceph  
ExecStart=/usr/bin/ceph-osd -f --cluster ${CLUSTER} --id %i --setuser ceph --setgroup ceph  
ExecStartPre=/usr/lib/ceph/ceph-osd-prestart.sh --cluster ${CLUSTER} --id %i  
ExecReload=/bin/kill -HUP $MAINPID  
ProtectHome=true  
ProtectSystem=full  
PrivateTmp=true  
TasksMax=infinity  
Restart=on-failure  
StartLimitInterval=30min  
StartLimitBurst=0  
RestartSec=20s

[Install]  
WantedBy=ceph-osd.target

References

• https://www.hiroom2.com/2017/02/18/linux-systemd-s-start-request-repeated-too-quickly-for-xxx-service/

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