"Permission denied" Displayed When Creating OSDs on Ceph
Symptom
Environment settings
Category |
Item |
Version |
|---|---|---|
Hardware |
CPU |
Kunpeng 920 processor |
Network |
Ethernet-10GE |
|
Storage |
3 x 480 GB SSD |
|
Memory |
1024 GB |
|
OS |
CentOS |
7.6 |
Kernel |
4.14.0 |
|
Software |
ceph-deploy |
2.0.0 |
Python |
2.7 |
Problem description:
When the ceph-deploy osd create ceph1 --data /dev/bcache0 --block-db /dev/sdb1 --block-wal /dev/sdb2 command is executed to create an OSD, the message "[ceph_deploy][ERROR ] IOError: [Error 13] Permission denied: '/sys/devices/pci0000:b4/0000b4:02.0/host6/port-6:3/end_device-6:3/target6:0:3/6:0:3:0/block/sdd/bcache/ceph-deploy-ceph.log'" is displayed.
Key Process and Cause Analysis
Run the ceph -s command to check the current cluster status. It is found that the cluster is in the HEALTH_WARN state. Run the ceph -w command to check the cluster status. It is found that the clocks of nodes are not synchronized. The cause is that the ntpd service on the clock source node in the cluster is disabled.
Conclusion and Solution
Start the ntpd service on the clock source node and manually synchronize the time on other nodes.
- Run the following command on the clock source node to start ntpd:
systemctl start ntpd
- Run the NTP synchronization command on other nodes.
ntpdate host1
In the preceding command, host1 indicates the clock source node.