大叔问题定位分享（30）mesos agent启动失败：Failed to perform recovery: Incompatible agent info detected

mesos agent启动失败，报错如下：

Feb 15 22:03:18 server1.bj mesos-slave[1190]: E0215 22:03:18.622994 1192 slave.cpp:7311] EXIT with status 1: Failed to perform recovery: Incompatible agent info detected.
...
Feb 15 22:03:18 server1.bj mesos-slave[1190]: ------------------------------------------------------------
Feb 15 22:03:18 server1.bj mesos-slave[1190]: Old agent info:
Feb 15 22:03:18 server1.bj mesos-slave[1190]: hostname: "server1"
...
Feb 15 22:03:18 server1.bj mesos-slave[1190]: ------------------------------------------------------------
Feb 15 22:03:18 server1.bj mesos-slave[1190]: New agent info:
Feb 15 22:03:18 server1.bj mesos-slave[1190]: hostname: "server1.bj"

通过日志发现是因为hostname有了变化，这是因为修改hosts文件导致的

# cat /etc/hosts
192.168.0.1 server1 server1.bj
->
192.168.0.1 server1.bj server1

解决方法也提示出来了

Feb 15 22:03:18 server1.bj mesos-slave[1190]: If recovery failed due to a change in configuration and you want to
Feb 15 22:03:18 server1.bj mesos-slave[1190]: keep the current agent id, you might want to change the
Feb 15 22:03:18 server1.bj mesos-slave[1190]: `--reconfiguration_policy` flag to a more permissive value.
Feb 15 22:03:18 server1.bj mesos-slave[1190]:
Feb 15 22:03:18 server1.bj mesos-slave[1190]: To restart this agent with a new agent id instead, do as follows:
Feb 15 22:03:18 server1.bj mesos-slave[1190]: rm -f /var/lib/mesos/meta/slaves/latest
Feb 15 22:03:18 server1.bj mesos-slave[1190]: This ensures that the agent does not recover old live executors.

mesos agent保存一个slave.info，其中包含hostname，如果hostname有变化，即和slave.info中不一样，就会报错

# cat /var/lib/mesos/meta/slaves/latest/slave.info
¥
server1
cpus @2*
mem ̀2*
disk  ~ﾲ*
ports"
￪2)

修复

# rm -f /var/lib/mesos/meta/slaves/latest
# service mesos-slave start