在安装ceph时，在执行monitor初始化mon、收集秘钥是出现异常报错
报错如下：
[c2][INFO ] Running command: ceph --cluster=ceph --admin-daemon /var/run/ceph/ceph-mon.c2.asok mon_status
[c2][ERROR ] admin_socket: exception getting command descriptions: [Errno 2] No such file or directory
[ceph_deploy.mon][WARNIN] mon.c2 monitor is not yet in quorum, tries left: 3
[ceph_deploy.mon][WARNIN] waiting 10 seconds before retrying
[c2][INFO ] Running command: ceph --cluster=ceph --admin-daemon /var/run/ceph/ceph-mon.c2.asok mon_status
[c2][ERROR ] admin_socket: exception getting command descriptions: [Errno 2] No such file or directory
[ceph_deploy.mon][WARNIN] mon.c2 monitor is not yet in quorum, tries left: 2
[ceph_deploy.mon][WARNIN] waiting 15 seconds before retrying
[c2][INFO ] Running command: ceph --cluster=ceph --admin-daemon /var/run/ceph/ceph-mon.c2.asok mon_status
[c2][ERROR ] admin_socket: exception getting command descriptions: [Errno 2] No such file or directory
[ceph_deploy.mon][WARNIN] mon.c2 monitor is not yet in quorum, tries left: 1
[ceph_deploy.mon][WARNIN] waiting 20 seconds before retrying
[ceph_deploy.mon][ERROR ] Some monitors have still not reached quorum:
[ceph_deploy.mon][ERROR ] c2
[ceph_deploy.mon][ERROR ] c1检查firewalld、iptables都是关闭的，查看hosts文件，正常
最后发现是hostname文件将主机名改错了，更改主机名与hosts文件内主机名一致，重启
执行命令ceph-deploy --overwrite-conf mon create-initial出现以下报错：
[c2][INFO ] Running command: ceph --cluster=ceph --admin-daemon /var/run/ceph/ceph-mon.c2.asok mon_status
[c2][ERROR ] no valid command found; 10 closest matches:
[c2][ERROR ] perf dump {<logger>} {<counter>}
[c2][ERROR ] log reopen
[c2][ERROR ] help
[c2][ERROR ] git_version
[c2][ERROR ] log flush
[c2][ERROR ] log dump
[c2][ERROR ] config unset <var>
[c2][ERROR ] config show
[c2][ERROR ] get_command_descriptions
[c2][ERROR ] dump_mempools
[c2][ERROR ] admin_socket: invalid command
[c2][WARNIN] monitor: mon.c2, might not be running yet在各个节点上执行命令pkill ceph关闭ceph进程后后，再次执行命令ceph-deploy mon create-initial，无报错
来源：51CTO
作者：wx5d8a23dbc329e
链接：https://blog.51cto.com/14557736/2476826