Ceph配置rbd client端的log file

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概述

openstack cinder通过librbd访问ceph rbd块设备，有时候需要查看rbd client端的log信息，这时候就需要在rbd client端配置ceph.conf文件。

因为我们openstack里的nova是通过libvirt来启动虚拟机的，所以这里需要保证libvirt对配置的log file目录有写权限。

ceph配置

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配置rbd client的cache，debug配置和log file
[client]
    rbd cache = true
    rbd cache size = 67108864
    rbd cache max dirty = 33554432
    rbd cache max dirty age = 5
    rbd cache writethrough until flush = true
    
    rbd_default_order = 25
    rbd_default_stripe_unit = 4194304
    rbd_default_stripe_count = 8
    
    admin socket = /var/run/ceph/ceph-client/$cluster-$type.$id.$pid.asok
    debug rbd = 20
    debug client = 20
    debug objectcacher = 20
    log file = /var/run/ceph/ceph-client/$cluster-$name.log

配置各个rbd client的keyring和log file
[client.images]
    keyring = /etc/ceph/images.keyring
    log file = /var/run/ceph/ceph-client/images.log
[client.volumes]
    keyring = /etc/ceph/volumes.keyring
    log file = /var/run/ceph/ceph-client/volumes.log
[client.cinder]
    keyring = /etc/ceph/cinder.keyring
    log file = /var/run/ceph/ceph-client/cinder.log

代码分析

默认情况下client端的log file等设置是为空的。

code analyse

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